Use a partition resizer to shrink, extend, move, or create Windows partitions. Learn when Disk Management is enough and when Qiling helps.

A partition resizer changes partition boundaries so you can extend C drive, shrink a data volume, create a new partition, or move unallocated space. It does not replace backup, and it should not be used on a failing disk before files are protected.
Use Qiling Disk Master when Windows Disk Management cannot extend, shrink, move, or create the layout you need. Back up important files before changing partition boundaries.
Step 1. Open Qiling Disk Master and check the whole disk map. Confirm where the C drive, data partition, recovery partition, and unallocated space are located.

Step 2. Select the partition you want to change and choose Resize/Move. Drag the edge to shrink or extend it, or move the whole partition if unallocated space needs to be placed next to another volume.

Step 3. If you are extending C drive, make sure the unallocated space is directly behind C drive. If another partition is in between, move that partition first and then extend C drive.
Step 4. Preview the pending changes. The list should match your plan exactly: move, resize, create, or format only the intended partition.

Step 5. Click Proceed. Keep the PC powered on and do not unplug external drives until the operation is complete.
Should I repair Windows before backing up? If the disk is readable, back up first. Repair commands, formatting, resizing, and reset options can change data or boot records.
Can Windows built-in tools solve the issue? Often yes. Use Settings, Disk Management, Startup Repair, CHKDSK, SFC, or DISM first when the risk is low. Use Qiling tools when you need a clearer disk map, safer preview, or a full backup before changing the drive.
What should I avoid? Do not format a drive that still holds needed files, do not run clean commands on the wrong disk, and do not clone to a target disk that contains the only copy of important data.
A good partition resize plan depends on where unallocated space is located. Preview the final layout carefully and keep a backup before moving partitions.