A hard disk, also known as a hard drive, securely stores all its data in a computer system's hard disk drive (HDD). This glossary provides simple explanations of key terms that help understand the function of a hard disk and its components, enabling recognition and comprehension of their purpose.
Access
The process of retrieving data and storing it in a device, as well as recovering deleted information, is known as data backup.
Access Time
The time it takes for the server to process a request and send the first byte of data back to the client.
Active Partition
A hard drive's active partition is the part that contains the operating system, such as Windows, and can only be set as one part of the drive.
Active Termination
A voltage controller creates a termination voltage, ensuring the data signal remains stable and robust.
Actuator
A hard drive's actuator regulates its speed and facilitates data access through multiple platters, ensuring efficient and organized information retrieval.
The actuators move the heads to a specific location, allowing the drive to read and write data from any point on the disk with high accuracy.
Actuator Arm
The actuator has read or write heads that are controlled by an arm, which moves the heads to their precise position. The arm is coated with a thin magnetic material, enabling smooth operation.
Adaptive Caching
A cache engine found on a hard disk, it can magnify performance by adjusting and adapting to the program on the move, with a ductile lifetime power.
Address
In the hard drive industry, addresses are categorized based on their relation to the drive. There are unit addresses, cylinder addresses, and sector addresses, each serving a specific purpose.
A.F.R.
The Annualized Failure Rate (A.F.R.) measures the likelihood of a device failing within its first year of operation, serving as a predictor of reliability and emphasizing the significance of redundancy in disk technology.
Allocation
Allocation involves preparing a hard drive to store data by designating a specific area for a given file, taking into account criteria such as size, label, and file system. This process, known as allocation, allows for the creation of a partition on the hard drive where data can be stored in a structured manner, making it easier to organize and manage files.
Arbitration
The process of determining which command, device, or protocol controls the operating environment, and allocating machine resources like memory to multiple programs.
Areal Density
The surface area of a disk, measured in square inches, determines the amount of data in bits recorded onto the surface. It's calculated by multiplying the bit density by the track density, which gives the size density.
A.S.P.
The A.S.P. drive object is used to retrieve information about a local hard disk or network, providing details such as volume, free space, serial number, and drive type.
To work with the resources of Drive Object, one has to create an occurrence of the Drive Object through the FileSystemObject object. The Drive Object's properties include available space, Drive Letter, Drive Type, FileSystem, FreeSpace, IsReady, Path, Root Folder, ShareName, etc.
Asynchronous Transmission
The use of requests in asynchronous transmission allows individual bytes of information to be synchronized. This approach has several advantages, including the self-oriented characteristics of transmission, where the transmitter and receiver do not need to be synchronized. However, asynchronous transmission also has some disadvantages, such as the overheating of start and stop bits, complications in handling errors, and lower transmission rates compared to other methods.
AT Bus Attachment (ATA-4)
The physical confluence in a computer connects storage devices internally, allowing them to communicate with the motherboard and execute basic input and output functions. The A.T.A. (Advanced Technology Attachment) concept bypasses the need for an external controller, instead using a set of slender wires connected by a cable bus to transmit data in and out of disk drives.
Average Access Time
The minimum length of time taken to perform seeks is usually measured and calculated with 1/3 stroke.
Average Seek Time
The time it takes for a hard drive to move its read or write heads to a secure, non-data landing zone and secure them in a specific location.
Bandwidth
The quantity of data sent within a circuit space, also known as the speed at which data can be screened, is calculated in gigabytes per second. It refers to the total number of bytes relocated, divided by the time between the first request for service and the completion of the last data transfer.
BIOS (Basic input/output system)
The program that guides a computer's basic functions and connects hardware to the operating system is called BIOS, which can be accessed through the Setup Utility.
Bit
A bit is the fundamental unit of digital information, represented by a single binary digit, either 0 or 1. It's the basic building block of all digital data and can be used to control simple ON/OFF functions. In computing, bits are the smallest unit of information and are used to store and process data on digital storage devices.
Bit density
The number of bits that can be stored in a given area, often expressed as bits per inch, is called storage density.
Block
In a UNIX workstation, a block is the smallest area that can be assigned for data storage, and is handled, stored, and accessed as a logical data unit.
Boot
You're referring to restarting your computer. This process reloads the operating system to its original state, essentially giving your computer a fresh start.
B.P.I.
The term "BPI" stands for Bits per inch, which is a measure of the quantity of information that can be stored on a hard drive. It determines the density of data on a physical medium, in this case, a hard drive.
Buffer
A disk buffer is a short-term memory storage area used to compensate for variations in data processing rates between sender and receiver, acting as a barrier between the computer and the physical hard disk platter.
Buffer Bandwidth
The speed at which data is moved to or from the buffer, typically measured in seconds, is determined by the processing capabilities of a discreet GPU.
The Burst Mode Transfer Rate refers to the speed at which data is transferred to a hard disk's buffer RAM, typically taking minutes or seconds, and is usually measured in Mbps. It's often 3-4 times faster than standard transmission protocols.
Byte
A byte is a unit of data that is 8 binary digits long, and hard drive storage capacity is measured in megabytes, which is the total number of bits divided by 8 million, with individual bytes being used in larger units for application purposes.
Cache
Cache memory is a type of hardware or software that stores short-term data in a computing environment, aiming to enhance the performance of regularly accessed data. It is a speedy and costly memory that quickly retrieves data by checking if the addresses of reading operations are already in the cache. If present, the data are returned instantly; if not, the address is grabbed from the disk and saved in the cache, improving overall system performance.
Capacity
The quantity of information saved on a hard drive is calculated in bytes, also known as storage capacity, and is measured in gigabytes and terabytes.
Channel
A connection on the motherboard or controller card is required, with most motherboards having two channels: primary and secondary. If your motherboard only has a primary channel, you'll need to add a secondary channel, which can be achieved by installing a controller card to generate the secondary channel.
Channel Assembly
In the computer industry, the final system gathering by the distributor from equipment provided by the manufacturer and from things shipped directly to the assembler is called Channel Assembly.
Cluster
A cluster is a group of sectors that can be allocated to a file, regardless of its size. It's also the basic unit of storage on a hard drive. When a file is created, one cluster is dedicated to it, and the cluster size increases with the partition size during the formatting process. This can lead to wasted space on small files, but creating multiple smaller partitions can help avoid this issue.
CMOS Setup
The program you're referring to is likely the "Device Manager" or "BIOS settings" in most systems. It helps configure internal and external devices, and also powers up the laptop's BIOS firmware, which is responsible for starting the computer and managing data flow.
Command Aging
The Small Computer System Interface (SCSI) feature removes the command reordering algorithm, allowing I/O configurations to proceed in the command queue without waiting for extended periods.
Command Queuing
The system enables a hard drive to receive and process I/O requests from multiple initiators in a specific order, ensuring efficient and organized data handling.
Command Reordering
Here, the drives change the order of I/O processes in the command queue, reducing seek time and rotational latency, but also increasing material passing through the system.
Controller
A controller is a tool that enables communication between a computer and its remote devices, also acting as a traffic manager. In a computer, a hard disk controller is an electronic device that assists the processor in reading, writing, deleting, and altering data to and from a hard disk. The interface controllers have evolved to serial interfaces to meet the increasing demand of transferring high-speed data.
Controller Card
The controller is usually installed in a bus slot in the computer and serves as an adapter with control electronics for multiple hard drives. It is typically installed on a motherboard to connect and control various computer components, such as hard drives, disk drives, and other input devices, ensuring their smooth functioning.
Correctable Error
A hard drive error that can be corrected using Error Detection and Correction strategy.
Customer Configuration Code (CCC)
The firmware tracking code, known as the CCC (Change Control Code), is a unique identifier that increments each time a significant product change is made, such as a change in form, fit, or function. This ensures that customers receive the correct and updated drive product.
Cyclic Redundancy Check (C.R.C.)
The CRC method is used to detect errors in digital data transmission by measuring the Cyclic Redundancy Check (CRC) data and comparing it with the original data sent. This allows the receiver to identify any errors that occurred during transmission, making it a useful tool for detecting defects in digital networks and storage devices.
Cylinder
1,024 cylinders are arranged on a hard disk, with a stack of platters rotating at a specific speed. The top of each cylinder is marked with identical track numbers on vertically stacked disks.
Cylinder, Head, Sector (C.H.S.) Addressing
The original computer access mode allowed addresses to information on hard drives by identifying tracks, heads, and cylinders, and recognizing each part of a disk by its location. This mode has been largely replaced by ECHS (Extended CHS) and LBA (Logical Block Addressing) but it still works by confirming the track, head, and sector numbers to locate individual blocks on the drive, each with a unique combination of cylinder, head, and sector.
Database
A database is a collection of data stored on a computer that can be used for multiple purposes, with the primary function of storing and retrieving file data quickly.
Data Synchronizer
A data synchronizer ensures seamless and safe data and customer experience by cleansing and checking data for faults, duplication, and consistency before making it usable. It synchronizes information between multiple devices and automatically updates changes between them to maintain accuracy within systems.
Dedicated Landing Zone
The dedicated landing zone on a hard disk is a specific area where the read or write head stays stationary and does not come into contact with the data cylinders, ensuring the safety and integrity of the data when the power is off. This zone helps prevent data corruption and ensures that the magnetized part of the disk remains safe and untouched. It serves as a secure storage location for the read or write heads when the drive is powered down.
Defect Free
Hard drives are made of magnetic fields and therefore do not wear off when not in use, making them defect-free as long as their recording surfaces do not contain any identifiable deficiencies.
Defect Management
The process of removing data errors on a recording surface by negating bad sectors is called defect management. It involves creating a defect table that is built into the drive itself, which is used to identify bad sectors encountered during the initial manufacturing process. This table helps determine the error-free zones on the disk where data can be stored, effectively avoiding the defective areas.
Desktop
The operating system, applications, and data files like documents, pictures, and music are all stored on a computer's drive. This program, often referred to as the "desktop," allows users to access and view the stored files and applications, and can be customized to display files in various locations, such as the desktop folder, the hard drive, or even another computer on the network.
Differential SCSI
SCSI (Small Computer System Interface) is a type of connection used for applications that require a long cable length of up to 30 meters. It uses multiple lines to transmit information and is also used for storage in computers. Additionally, SCSI refers to the ports and cables that connect various devices such as hard drives, optical drives, scanners, and others to a computer, using Single-Ended or Low Voltage Differential electric interfaces between the device and host adapter. Each data signal has a corresponding ground wire.
Direct Memory Access (D.M.A.)
DMA transmits information directly to and from the primary memory without going through the CPU, allowing the system to perform CPU processing while transmitting data to/from the hard drive, thus improving its speed and capability, managed by a chip called DMA Controller.
Disk
The disk cache is a part of a computer's RAM that temporarily holds data read from a disk. It's a magnetic storage medium that keeps data that has been recently requested from the disk, unlike a RAM disk which holds all files. It's a short-term storage for frequently accessed data.
Disk Controller
It's a chip that handles the transmission or access of information between a disk and a buffer, managing the flow of data between these two components.
Disk Drive Controller
A hard disk drive (HDD) controller is a critical component that manages the interaction between the computer's central processing unit (CPU) and the hard disk drive. It consists of two main parts: the disk controller and the interface controller.
Disk Operating System (D.O.S.)
A computer program offers a file system for organizing data, creating files, and processing on a storage disk.
Disk Transfer Rate
The speed at which data is transmitted to and from a disk platter, typically ranging from 100 Mbps to 200 Mbps.
E.C.C. On-the-Fly
This strategy involves correcting faults in the read buffer before transmitting to the host, without affecting performance. The corrections are done locally and don't require firmware assistance, making them invisible to the host system.
E.I.D.E. (Enhanced Integrated Drive Electronics)
The first interface a desktop computer uses is to connect hard drives to the central processing unit, acting as a negotiator between the computer and storage device.
Embedded Servo Control
The servo configuration used on hard disks is designed to provide precise and faultless feedback data to the head position servo system. This configuration does not require a full data space, as the servo control information is contained on every surface.
Encoding
During encoding, data patterns are developed and arranged in a specialized format for methodical transfer, typically involving characters like letters, numbers, and punctuation symbols.
Enterprise
A cluster of computers, typically used for high-volume tasks, includes individual workstations for demanding tasks like design, engineering, and audio/visual applications.
Enterprise Storage Group
There are three main types of enterprise storage: Direct Attached Storage (D.A.S.), Network Attached Storage (N.A.S.), and Storage Area Network (SAN). These storage solutions are designed to operate in workstations, servers, and storage devices, making them suitable for various business needs.
Error Correction Code (E.C.C.)
The algorithm is a mathematical method that detects and corrects errors in a data field. It encrypts information, allowing a decoder to identify and fix faults in the data.
Error Log
An error log is a file that collects cases of critical errors and failures faced by an operating system, application, or server, including errors like hardware or software failures, table and configuration corruption, etc. It can be a useful tool for troubleshooting and controlling issues.
Error Rate
The number of errors that occur while reading a particular number of bits is a measure of the proportion of faulty units to the total number of units transferred. This metric indicates the reliability of the data transfer process.
Extended Partition
Multiple partitions can be created on a single primary partition and expanded partitions on a hard disk. However, the operating system files must remain on the primary partition. Expanded partitions, on the other hand, can store files other than operating system files, allowing for more flexibility in organizing data on the disk.
F.A.T. (File Allocation Table)
The FAT (File Allocation Table) file system is a system used for hard drives that employs 12 to 16 bits for every cluster entry, allowing for efficient management of files. It serves as a data table that stores file information and helps extend the lifespan of a hard drive, making it a crucial component for operating systems to govern specific files present in a hard drive.
Fdisk
It is a utility that allows users to change the partitioning of their hard drive, and it is included in all versions of MS-DOS and Windows operating systems.
Fetch
The process of retrieving and using stored data in an operating system, which occurs continuously from startup to shutdown.
Fibre Channel (F.C.)
The Fibre Channel standard is a set of guidelines created by an ANSI-approved X3 group, providing up-to-date protocols for ductile data transfer. It supports three topologies: point-to-point, arbitrated loop, and fabric. Fibre Channel is commonly used in servers that utilize drives with 40-pin "SCA-2" hot pluggable backplanes.
Fibre Channel Arbitrated Loop (FC-AL)
A group of high-A speed fiber channel network system uses loop topology to connect devices, providing a high-end storage interface that meets the demands of high-performance applications.
Firmware
Firmware can be thought of as instructions set up directly into the circuitry read-only memory, guiding the functions of the computer, and is hard-coded into the hard drive, allowing hardware to connect with software.
F.I.T. (Functional Integrity Testing)
A set of tests stored on a hard drive that ensures compatibility with hosts, operating systems, adapters, software, and peripherals, typically run before product release to manufacturing.
Flow Control
The process of transferring data between devices, such as nodes in a network or between the CPU and its surrounding devices, is called data transfer. This process involves the sending device adjusting its data transfer speed to match the receiving device's capacity, ensuring that data is transmitted efficiently and effectively, even when there are differences in speed between devices. This helps devices with lower speeds communicate with devices that have higher speeds, and vice versa, facilitating smooth and uninterrupted data transfer.
Format
Low-level formatting is a procedure that prepares a hard drive to store information by creating areas of sectors to keep user data safe, effectively deleting all data on the drive and setting up the file system for storing and retrieving files.
Formatted Capacity
Formatted capacity refers to the total storage space available in a large storage unit after accounting for the overhead data needed for formatting the media. It's the amount of bytes that can be used for storing data after the device has been formatted for usage. This is different from the raw capacity, which is the total number of bytes present on the device. Formatted capacity is what remains after subtracting the capacity consumed by the overhead data.
Form Factor
The tangible and superficial features of a particular device
Full-Duplex
A full-duplex communication convention enables the simultaneous transfer of data and receptions in both directions of a communication channel, making it ideal when communication from two devices is always necessary.
G.B. (Gigabyte)
1 billion bytes is equal to 1 gigabyte, which is also equivalent to 1000 megabytes.
Giant MR (GMR)
The primary implementation of GMR is in magnetic field sensors, particularly in hard disk drives and other devices, where it is used to understand data.
Half-Duplex
A communication strategy where data can flow in both directions, but the actual transmission happens in only one direction at a time. This means that one device can send data while the other device receives it, and vice versa.
Half-height Drives
An internal disk drive can be either 1.0 inches or 1.6 inches in length, with the latter being the height of a Half-height drive.
Hard Drive
The electromagnetic device that contains operating systems, software programs, and multiple files using magnetic disks is called a hard drive. It manages and guides the reading and writing of data on the hard drive, serving as a primary or secondary storage device in a computer.
Hard Drive Industry
The storage industry.
Hard Error
A problem in RAM can cause a physical flaw that persists due to a hardware defect, resulting in an error that occurs every time the same area on a disk is accessed.
Hard Sectored
A methodology that utilizes digital signals to determine the start of a sector on a track is being developed. This approach involves using digital signals to stipulate the initiation of a sector on a track, which could potentially improve the accuracy and efficiency of various applications.
Head
The read/write head is a tiny electromagnetic coil and metal pole that converts the platter's magnetic fields into electrical current, allowing data to be read or written. In a multi-platter drive, there is a dedicated head for each data surface.
Head Actuator
A device moves a hard drive's head to straighten read or write heads to read and write information.
Head Crash
When the read or write head of a hard drive comes into contact with the spinning disk surface, it can cause significant physical damage to the disk, resulting in data loss and potentially rendering the drive unusable. This occurs because the head is positioned above the spinning platter, and any contact can lead to destruction of the disk's surface.
Head Disk Assembly (HDA)
A hard drive's mechanical components, such as the platter, read/write arm, spindle motor, and actuators, are collectively referred to as its mechanical assembly.
Head Loading Zone
The head loading zone is a reserved space on the disk where the heads can safely move when the power is off, ensuring a smooth transition when the drive is turned back on. This zone does not store any information.
Head Stack Assembly
The inside of a hard drive where numerous platters are stacked, with read/write heads on the surface and data scripted beneath each platter.
Headerless Format
The lack of header or ID fields in a format ensures high effectiveness and a significant user base.
High-Level Format
Quick formatting is a fast operation that sets up vacant file systems for storing and receiving new data, whereas a high-level format is implemented on a new hard drive before it can be used.
Host
A host computer is a central computer that connects to and manages other computers and devices in a network.
Host Adapter
The host controller, also known as the host adapter, is a plug-in board that enables communication between a computer system and external devices such as hard drives, fiber, and USB. It acts as an interface between the computer's bus and the disk drive, facilitating data transfer between the two.
Host Interface
The hard disk interface is the connection between the host computer system and the hard disk, responsible for transferring data between the hard disk cache and the host memory, with different interfaces affecting the speed of data transfer.
Host Transfer Rate
The speed at which a host computer can transmit information across a SCSI or E.I.D.E. interface is limited to 100-200 Mbps.
IDE (Integrated Drive Electronics)
IDE hard drives are those that have the interface controller electronics built into the hard drive itself, rather than as a separate device, and are connected to a computer's motherboard through a specific interface.
Index Pulse Signal
It is a sign of the beginning of a disk revolution by a digital pulse signal, which after indexing, leads to the servo pattern or pre-recorded data on the disk.
Initiator
It sends commands to a target via the SCSI bus, and some devices can perform both initiator and target functions.
It is the data received by the computer, such as commands from the user, which is then processed by it.
Input/output (I/O)
It's a device that receives and processes data, and can also send information to a computer.
Interface
The interfaces of hard drives have been modified to accommodate high-speed data transmission, with primary interfaces including Fibre Channel (F.C.), Serial A.T.A. (SATA), and Serial Attached SCSI (S.A.S.).
Interface controller
Data is interpreted through a circuit, then structured for the hard drive, and manages data transmission between the host and buffer.
Interleave
The organization of sectors on a track is a method to enhance slow system performance in block storage devices like a hard disk, by keeping information accessed in a particular order, into sector blocks.
Interrupt
An alert is sent from a subsystem to the CPU, informing it whether a process has been completed or not. This alert cues the operating system to finish work on one process and start work on another.
I.S.A.
I.S.A. is the 16-bit internal bus used in I.B.M. PCs and A.T.s during the 1980s, based on the Intel 80286 and its descendants, and was backward compatible with the 8088-based I.B.M. PC's 8-bit bus.
Jumper
An E.I.D.E. jumper connects the pins on the circuit board on the hard drive jumper block electronically by placing electrically conductive elements over them, such as choosing a slave or master hard drive, and is located near the 40-pin connector on the hard drive.
Just-in-time (J.I.T.)
The Just-In-Time (JIT) system is a production and inventory control methodology used in various industries, including the creation of hard drives. It involves sending several elements to an assembly point as needed, rather than producing and storing large quantities in advance. This approach aims to minimize waste and optimize resource utilization by delivering materials and components just in time for production, thereby reducing inventory costs and improving efficiency.
Kilobyte (K.B.)
A kilobyte is a unit of 1000 bytes, but in computer memory, it's equivalent to 1024 bytes, which is divided into quantities that are powers of two.
Landing Zone
When the power is off or when instructed, the read/write heads move to a specific spot on the inner disc, which is not used for storing user data.
Laser textured media in hard drives enhances their durability by limiting corrosion and improving resistance. This technology allows for more robust and accurate storage, making newer models more stable and less prone to errors.
Latency
The time it takes for the read/write heads to wait for the disc to turn to the proper position before accessing data is approximately 5.8 milliseconds for a disc rotating at 5200 RPM.
Local Area Network (LAN)
In a Local Area Network (LAN), users within the same organization are connected to a centrally-stored database of information in a server, allowing them to access and share information regularly.
Logical Address
A controller sends a data request to a storage location, but the address used may not be the actual location. The controller then translates the request from a logical to a physical address to retrieve the data from the correct physical location on the storage device.
L.B.A. (Logical Block Addressing)
The technique of Logical Block Addressing (LBA) replaces the traditional cylinder, head, and sector (C.H.S.) addressing system with a single collection of logical block numbers to address a drive's sectors, making it possible to access larger drives than was typically possible with C.H.S. addressing.
Logical Drive
A logical drive is a portion of the hard disc that, in a directory structure, seems to be a distinct drive, created on a hard drive's expanded partition, allowing up to 23 logical drives to be made, typically used to arrange directories and files.
Logistics Model
Businesses use a method to plan their physical product delivery, including sales to various entities such as distributors, retail chains, and O.E.M. clients.
Low-level formatting
Low-level formatting is a process where sectors are generated on the disc surface, allowing the operating system to use the areas required to build the file structure, typically done in high-end technical data centers or manufacturing facilities.
Low profile (L.P.)
Hard drives using the 3.5-1.0-inch and 1.6-inch standard hard drives are available, and low-profile hard drives are one inch tall.
Magnetic flux refers to the quantity of magnetic field lines passing through a closed surface, providing an estimate of the overall magnetic field covering a specific area. It can also be described as the arrangement of magnetic pole directions when written to a disc.
Master
The primary drive is the first drive in a twin-drive setup, directly connected to the IDE connector from the motherboard, and is the first device the motherboard attempts to access when the computer is turned on. It is the master hard drive, functioning independently without slave drives, and is the primary accessible drive.
Media
A storage medium is a device or material used to store data, such as a hard drive, USB drive, or CD, which can hold and retain information. Examples include external hard drives, internal solid-state drives, magnetic tape, CDs, and non-volatile memory cards. The magnetic coating on hard drive discs is sometimes referred to as the storage medium.
M.B. (Megabyte)
A megabyte is one million bytes, and early personal computers had 5-megabyte hard drives.
Mechanical Latencies
Mechanical latencies, such as rotational latency and seek time, are a major bottleneck in hard drive performance, taking longer than electronic latencies involved in data transmission.
Memory
A computer system or device that stores and accesses information, with abundant storage space on the hard drive ranging from 1 GB to 1 TB, and RAM temporarily storing information, downloading data from the internet to be securely kept on the hard drive.
M.F.M. (Multiple Frequency Modulation)
Modified Frequency Modulation (M.F.M.) is a technique that erases blank spaces from magnetic media like tapes and discs to capture digital data, doubling the amount of storage compared to the prior recording technique.
M.R. Heads (Magneto-resistive Heads)
M.R. (magneto-resistive) heads were designed to improve drive performance and increase data density. Unlike traditional inductive heads, M.R. heads have separate read and write elements. The read element uses a magneto-resistive material to detect data on the disk, while the write element uses an inductive material to write data. This design allows M.R. heads to read data more accurately and at a higher density than inductive heads, making them more efficient.
MTBF (Mean Time Between Failures)
The MTBF is calculated by dividing total failures by total operating hours, indicating the reliability of equipment increases with the period between failures.
M.T.T.R. (Mean Time to Repair)
Field repairs typically only involve replacing large subassemblies, such as the printed circuit board (PCB) or sealed housing, as these are not functioning and are usually the source of the issue, with component-level repairs being rare and usually only necessary for specific component failures. The time required for such repairs is relatively short, often taking only a few hours or days to complete, depending on the complexity of the repair and the availability of replacement parts. This is in contrast to factory repairs, which can take weeks or even months to complete, especially for complex systems or those requiring specialized tools and expertise. The speed and efficiency of field repairs make them an attractive option for many organizations, as they can quickly get their equipment back up and running with minimal disruption to their operations. This is particularly important for industries such as healthcare, where equipment downtime can have serious consequences for patient care. In these situations, the ability to quickly repair equipment in the field can be a lifesaver, and the benefits of field repairs are clear. Overall, field repairs offer a convenient and cost-effective way to keep equipment running smoothly, and they are an essential part of many organizations' maintenance and repair strategies.
Multi-media
A presentation of information in multiple media, such as auditory and visual, at the same time.
Multi-user
A system that allows multiple users to access and share data simultaneously.
Network Computer
The computer has limited local storage capabilities and relies on a central data storage facility, such as a server or RAID system, for its primary data storage needs.
Operating System
Software that enables communication between computer hardware and the user and applications is known as a device driver. It acts as a bridge between the hardware, such as a hard drive, and the operating system, allowing them to work together seamlessly.
Partition
Partitioning a hard drive is a logical method where the operating system views each division as a different hard drive, with a different drive letter assigned to each partition.
Passive Termination
The termination architecture uses a voltage divider network of passive resistors to match the frequency at the end of the SCSI bus, effectively terminating the bus.
PC
A personal computer is a compact, affordable, and practical microcomputer designed for individual use.
The Personal Storage Division refers to a collection of techniques and technologies used to record and store digital data on various mediums, including magnetic, optical, and silicon-based storage devices.
Platform
The foundation of various goods is built on this fundamental concept, which serves as the starting point for creating and manufacturing different products.
A platter is a metal or stiff material disk inside a fixed-disk drive that stores data on one or both of its surfaces, with multiple platters stacked on a spindle to increase storage capacity.
Port
A socket or connection on the controller card or motherboard, typically one or two ports, which may require a separate controller card for a second port if the motherboard only has one.
Pre-fetch
It is queued instructions that are loaded into a processor's external bus during transient states.
Primary Partition
Partitioning a hard drive is a technique that conceptually divides the drive into separate sections, allowing an operating system to see each partition as a distinct hard drive. This means that each partition has its own unique drive letter, enabling multiple operating systems or file systems to coexist on the same physical drive.
Protocol
Data transfer methodology, also known as data transfer protocol, is a method that establishes time, control format, and data representation for transferring data between devices or systems.
P.R.M.L. (Partial Response Maximum Likelihood)
The technique, used in computer data storage, extracts digital information from a weak analog read-back signal captured by the head of a magnetic storage device or tape drive. It involves a read channel that precisely retrieves user data from the drive using sampled data, active equalization, and Viterbi detection.
Programmed I/O
In this method, data flow between the system and the disk drive is directly managed by the system CPU and supporting hardware, with various programmed I/O speeds referred to as "P.I.O. modes".
Proximity Recording
It is a recording method that allows the read/write head to be close to the disk surface, increasing recording frequency.
Qualification
A procedure is used to evaluate potential system components for their suitability and usefulness.
Queue
The first-in-first-out (FIFO) data model is used to order multiple requests for a resource, such as a printer or processor, by moving items from the front of the queue to the back, with the first item added being the first to be processed.
Radial Path
The diameter of a disk is the distance between two points on the edge of the disk that are directly opposite each other.
Random Access Memory (RAM)
Unlike sequential access devices like tape drives, random access memory (RAM) allows the CPU to access any storage location at any time, enabling the fastest data access possible. Since RAM is quick, data is moved from the hard drive to RAM for efficient handling by the CPU.
Read Channel
The drive converts computer data into magnetic signals that are written onto a magnetic medium, such as a hard drive or floppy disk, and then accurately reads the data back in.
Read Verify
Data verification is a method that checks the accuracy of data by reading it from the drive to the controller, which then verifies the data for errors before sending it on to the system.
Read/Write Head
The read/write head of a hard disk is a physical component that reads data from and writes data to the drive. It consists of an actuator arm and a thin magnetic blade.
Recoverable Error
The device is experiencing a read error that can be resolved by performing an E.C.C. (Error Correcting Code) recovery operation or by re-reading the data.
Redundant Arrays of Independent Disks (RAID)
RAID (Redundant Array of Independent Disks) is a data protection technique that stores the same data in multiple locations on several disk drives or solid-state drives (S.S.D.s), providing protection against drive failure. However, not all RAID levels prioritize durability, and some focus on other benefits like increased storage capacity or improved performance.
RLL (Run Length Limited)
RLL encoding is the most common hard drive encoding system, allowing twice as much information to be stored on a single drive compared to M.F.M. and three times as much as F.M. It achieves this by merging sets of bits into a single unit to create specific flux reversal patterns.
Rotational Latency
The period is taken to get data from a disk because it rotates, with a typical rotational latency of 5.8 milliseconds for a disk rotating at 5200 RPM.
R.P.M. (Revolutions per Minute)
The spindle speed, or disk's spinning speed, is typically fixed for hard drives. As the rotational speed per minute (R.P.M.) decreases, mechanical latencies increase, affecting rotational delay and overall hard drive performance.
SCA-2
The SCA-The Single Connector Attach (SCA-2) interface offers various options for backplane connectors for SCSI devices, including a grounding contact, blind mate connector, direct plug misalignment tolerance, ESD protection, and hot swap functionality, and is also known as the 80-pin SCSI connector.
Small Computer System Interface (SCSI)
A connection point for peripheral controllers and computers, widely used in Apple Macintosh systems, is also known as Enhanced Integrated Drive Electronics.
SCSI Configure Automatically (SCAM)
It allows consumers to attach SCSI devices without worrying about installation options.
Sector
It is a 512-In SCSI and E.I.D.E. hard drives, data is transmitted and stored in the form of a sector, which is the smallest unit of data that can be read or written to the drive by the host interface. Sectors are often grouped together into blocks or logical blocks, which serve as the lowest data unit allowed on Macintosh and Unix drives. These blocks are typically considered a single sector, making the terms "block" and "sector" sometimes used interchangeably.
Sector Slipping
It keeps data in chronological order during a format or transfer process by pushing down problematic sector sites, and the drive contains spares for this reason.
Seek
The process of accessing data on a hard drive can be defined as a read/write headset being moved to a specified spot. This involves the actuator, which transfers the heads to the cylinder holding the data storage sector and track.
Seek Time
The device can measure the time it takes for the hard drive's read/write head to move to a specific location on the disk, providing a measurement in milliseconds.
Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)
Predictive hard drive failure analysis is a technique that helps users anticipate and prevent system breakdowns caused by impending hard drive failure, allowing them to take proactive measures before it occurs.
Sequential Access
Sequential access refers to the process of reading or writing data in a linear, sequential manner, rather than accessing specific data points randomly. This is often used with magnetic tape drives, where data is stored in blocks that are read or written in a continuous sequence, one block at a time.
Serial Storage Architecture (S.A.A.)
The X3 organization, with ANSI approval, created a series of standards known as X3. This group of specifications establishes a new serial connection with dynamic add/drop functionality.
Server
A server is a computer system that provides access to shared resources, primarily used for storing data. It typically includes an operating system designed for network use.
Servo Burst
The system delivers positional data to the actuator arm, which is embedded in or covers the entire disk surface at regular intervals.
Single-ended SCSI
A single-ended SCSI interface is a type of SCSI electrical interface that uses one signal and one ground line for each SCSI signal, typically used for cables less than 19 feet.
Slave
It is a dual drive combination's second drive.
Soft Error
This mistake does not surface while rereading the same spot.
Soft Sectored
The method allows the controller to find the start of a sector by reading the disk's format data.
S.P.C.
The Primary Commands for SCSI are a set of essential commands that all storage devices must implement. These include the INQUIRY, READ CAPACITY, REQUEST SENSE, and TEST UNIT READY commands, which are fundamental to the design of storage devices and ensure they can function correctly with other devices on the SCSI bus.
Spindle
The central, rod-Disk drives use axles to hold the disks in place, and their performance is measured by spindle speed, which is expressed in rotations per minute (R.P.M.).
Spindle Motor
The spindle motors in hard drives are essential for their performance, as they move the disks. The accuracy of these motors directly impacts the capacity and speed of hard disk drives, making them a crucial component in determining the overall functionality of the device.
Spindle Speed
The rotational speed of a disk's spindle motor can be increased to enhance data access times. This is achieved by reducing the wait time for the correct sector number to pass beneath the head, allowing for faster sequential operations and improved random access times. As a result, there has been a desire to accelerate the spindle motor.
Spindle Synchronization
This feature rotates SCSI hard disks in systems with multiple drives simultaneously to the same address position, allowing for efficient and simultaneous disk management.
Storage Capacity
The volume of information that a hard drive can hold is known as its storage capacity.
Subsystem
A component is a part of a system that performs a specific function. In the context of a personal computer, for example, the hard disk is a component that stores data.
Surface
A portion of a platter is coated with magnetic material for data recording, either on the top or bottom, and can be used to hold data on either surface.
Synchronous Transmission
In a phase-locked transfer, a correction device ensures that the transmitting and receiving devices maintain the same phase connection, while operating at the same frequency.
System Files
File systems organize, transmit, and receive data to a hard drive partition, and define an index and the types of information that can be included in a file.
Tagged Queuing
A feature included in some A.T.A. and SCSI hard disks, allowing a hard drive to receive numerous read and write requests from the operating system.
Task File
The E.I.D.E. interface uses a group of I/O Host Interface Registers to communicate with the drive, exchanging status, commands, and data.
Thin Client Architecture
A computer system where data is stored centrally, with limited storage space at user points, operates by remotely connecting to a server-based computing environment where most apps, confidential info, and memory are kept.
T.P.I. (Tracks per inch)
The track density on a disk's surface is a measure of how tightly the tracks are packed, calculated by the number of tracks written per inch of surface.
Track
A track is a physical division of data on a disk drive, utilizing a concentric magnetic circle pattern for data storage and reading. It is used in the Cylinder-Head-Record (C.C.H.R.) addressing mode of a CKD disc.
Track-to-track Seek Time
The time it takes for a hard drive's head assembly to read/write data to a specific sector of the disk after the actuator arm, to which the heads are attached, is correctly positioned on the track where the data is stored.
Transfer Rate
The transfer rate is the speed at which a controller delivers and receives data to and from a hard drive, taking into account processing, head swaps, and searches to accurately represent drive performance. It differs from the burst mode transfer rate, which only applies to data transfer into RAM.
Translating BIOS
The BIOS allows access to E.I.D.E. drives larger than 528 MB, using the disk's logical geometry directly without translation at the BIOS level, making it a configuration for larger storage needs.
Ultra SCSI
The device offers 40 MB/s transmissions over a 16-bit Wide SCSI bus or 20 MB/s transfers over an 8-bit bus, commonly known as Fast-20 SCSI, often seen in SCSI-3 drives.
Ultra D.M.A./33
It is a high-The speed host data transfer function is a method for transmitting information from a hard drive to the computer's random access memory via the data paths of the computer, with a data transfer rate of 33.3 MB per second.
Unformatted Capacity
The entire amount of disk space that can be used, taking into account the space needed to store location, boundary definitions, and servo data, is known as the total disk space.
Unrecoverable Error
A read error that cannot be corrected using Error Correction Code (ECC) or server retries is known as a unrecoverable read error.
Untagged Queuing
The drive can process one I/O request from each initiator at a time.
Upgrade
Upgrading a computer's storage capacity is not possible with an existing drive, so it's either replaced with a more capable one or a new drive is added to increase storage space.
Viterbi Detection
The methodology used in reading channel technology accurately detects data written on a disk by comparing actual sequences of data bit samples with possible sequences of data bit samples, determining the most likely sequence of data bits.
Voice Coil
The device's head moves in direct proportion to the force applied by the magnetic rotating voice coil, which is an actuator motor.
Winchester Disk
The term "Winchester" refers to a traditional name for a hard drive, originating from a first-generation IBM disk drive with 30 MB of fixed capacity and 30 MB of detachable storage.
Windows
Windows is a collection of graphical operating system versions created and promoted by Microsoft.
Workstation
A high-performance computer designed for engineering, design, and multimedia applications, offering rapid data access and manipulation capabilities.
Write
Flux reversal is a process where the magnetic field on a disk's surface changes direction, creating areas of opposite polarity. This phenomenon is captured through the process of flux reversal.
Write Cache
Here, data transport from the host to the hard drive is buffered using fast RAM.
Write Verify
A drive with Write Verify functionality writes data, then checks if it can read the data back, and if not, it writes the data again to another location on the drive to verify.
Zoned Recording
This methodology increases the amount of hard drive space by using more sectors per track, allowing the outer tracks to have more sectors than the inner tracks.
Losing data can be stressful for those who lead a digital lifestyle, especially when it's accidental, such as deleting files or emptying the recycle bin. To better understand and navigate this situation, it's essential to familiarize yourself with the technical terminology used in hard drive data recovery. This glossary provides detailed explanations of related terms, helping you grasp the technical aspects of the subject.