Recover Deleted Weka ARFF Datasets on Windows

Updated on Oct 31, 2026 | by Qiling

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Understand the Missing File
Check Backups and Protect the Source
Recover with Qiling Deep Data Recovery
Validate the Recovered Copy
Frequently Asked Questions

If Weka ARFF Datasets disappear from a Windows drive, first establish whether they were deleted, moved, or replaced by a different version. Stop saving to that drive while checking. This guide covers local deleted-file recovery, not reconstruction of unsaved work or automatic repair of a damaged dataset.

Understand the Missing File

ARFF describes a dataset using a relation, attribute definitions, and data records. Attribute order and nominal-value definitions affect how a model interprets the values.

Write down the original folder, approximate size, last known save time, and any companion files. A file that is still present but will not open needs a separate corruption or compatibility investigation. Keep that file unchanged rather than deleting it to create a new recovery problem.

Check Backups and Protect the Source

Check Weka working folders, source CSV files, experiment copies, Recycle Bin, and backups. Preserve train/test splits and any preprocessing description alongside the dataset.

Check an Existing Copy First

Open Recycle Bin and look for the original filename and location. If a complete copy is available, confirm its version before restoring it. For a synced folder, check the provider's recycle bin and version history. For Windows backup or Previous Versions, recover a candidate to another physical disk where the recovery method allows it.

Prepare for a Disk Scan

If no usable copy exists, stop writes to the physical source disk. Do not install recovery software there or regenerate datasets into the original folder. New writes can overwrite deleted blocks, and SSD TRIM can make them unavailable. Prepare another physical drive with enough free space for all candidate versions.

If the device makes unusual noises, disconnects repeatedly, or reports read errors, stop repeated DIY attempts and consider specialist assistance. Do not format an unreadable source just to make it appear in File Explorer.

Recover with Qiling Deep Data Recovery

Qiling Deep Data Recovery scans Windows-visible local disks and removable media for lost files. Recovery depends on the surviving file records and content; no particular extension is guaranteed to be recoverable or previewable. A local scan cannot retrieve data that existed only on a remote server.

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Step 1. Choose the Mode That Matches the Loss

Open the program from a drive other than the source. Choose Fast Scan for recent local deletion, Recycle Bin Scan after emptying the bin, USB/SD Scan for removable storage, or Format Scan after an accidental format. Select by the storage event, not by the file extension.

Choose the Qiling recovery mode for Weka ARFF Datasets

Step 2. Select the Original Volume and Start Scanning

On the location screen, identify the volume that held the missing file. Match its drive letter and capacity with your notes; do not select the empty destination drive. Select that source volume and click Scan. Let the scan finish before concluding that a file is absent.

Select the source volume and click Scan in Qiling

Step 3. Select Plausible Files and Their Companions

Review the results by original name, folder, extension, date, and size where those details are available. Select more than one plausible version if necessary. Include companion files and dataset parts identified earlier. A recognizable name or a nonzero file size does not establish that the content is complete.

Review recovery results for Weka ARFF Datasets

Step 4. Recover to a Different Physical Disk

Select the required candidates and click Recover. Choose a folder on the prepared destination disk, not another partition on the physical source disk. Wait for saving to finish, then confirm that the output files exist. Keep an untouched recovered copy and use a duplicate for the checks below.

Save recovered files to a separate physical disk

Validate the Recovered Copy

Read a copy in an editor, then open it in Weka. Check attribute count, types, class assignment, instance count, and representative records without overwriting the recovered original.

If a candidate is incomplete, compare alternate recovered versions with earlier backups or the original export. Do not combine mismatched dataset parts solely because their filenames look similar. After validation, back up the working result and the dependencies needed to interpret or reproduce it.

Frequently Asked Questions

Can a CSV replace ARFF without any extra work?

Not always. CSV may not retain the attribute types and nominal declarations used by the experiment.

Why can a valid ARFF produce different results?

The recovered version may have different rows, attribute order, or preprocessing; verify the experiment context.

What if the scan finds a file that will not open?

Try another recovered version and check application compatibility on a copy. Deleted-file recovery does not rebuild overwritten content or guarantee a repairable file. Retain the original candidates while investigating.