How to Delete a Partition in Windows 10 and 11
Deleting a partition permanently removes all data stored in that partition and converts the space to unallocated — which you can then use to extend an existing partition or create a new one. This guide covers both methods: the graphical Disk Management tool and the command-line DiskPart, along with critical warnings about which partitions must never be deleted.
Permanent — This Cannot Be Undone
Deleting a partition destroys all files it contains. There is no Recycle Bin for partition deletions. Back up any data you need before proceeding. This includes documents, applications, and any files stored on that drive letter.
Quick Answer
How do I delete a partition in Windows?
Open Disk Management (Win + X > Disk Management), right-click the partition you want to delete, and select Delete Volume. Confirm the warning. The partition is removed and the space becomes Unallocated. Never delete partitions labeled EFI, Recovery, OEM, or System — these are required for Windows to boot.
Which Partitions Are Safe to Delete?
| Partition Label | Safe to Delete? | Notes |
|---|---|---|
| Drive D:, E:, F: (data partitions) | Yes — with backup | Standard data partitions. Delete only after backing up all data. |
| C: (Windows system drive) | No | Contains Windows itself. Deleting this destroys the OS installation. |
| EFI System Partition (ESP) | No | Required for UEFI systems to boot. Deleting makes the PC unbootable. |
| Recovery Partition | Caution | Used for Windows Reset and recovery. Delete only if you have a Windows USB. |
| OEM Partition | Caution | Manufacturer recovery partition. Safe to delete if you have reinstallation media. |
| System Reserved (MBR) | No | Contains the boot manager. Required for MBR systems to boot. |
Open Disk Management
Press Win + X and click "Disk Management" from the menu. Alternatively, press Win + R, type diskmgmt.msc, and press Enter. You need administrator privileges.
Identify the partition you want to delete
Look at the disk map at the bottom of the window. Partitions are shown as colored blocks. Find the one you want to remove. Confirm it is not labeled EFI, Recovery, System Reserved, or OEM.
Right-click the partition and select Delete Volume
A confirmation dialog warns that all data will be lost. Click Yes to confirm. If the option is greyed out or shows "Delete Partition" instead of "Delete Volume," see the DiskPart method below.
Verify the space shows as Unallocated
After deletion, the block turns black and shows as "Unallocated." This space can now be used to extend an adjacent partition or create a new volume by right-clicking and selecting New Simple Volume.
Open Command Prompt as Administrator
Press Win + X and select "Windows Terminal (Admin)" or search for "cmd," right-click Command Prompt, and select Run as administrator.
Launch DiskPart and list all disks
Type: diskpart and press Enter. Then type: list disk — You will see all physical disks. Identify which disk number contains the partition you want to delete.
Select the correct disk
Type: select disk 1 (replace 1 with your disk number). Then type: list partition to see all partitions on that disk with their sizes and types.
Select and delete the partition
Type: select partition 3 (replace 3 with your partition number from the list). Then type: delete partition — For protected system partitions that resist normal deletion, use: delete partition override — Warning: the override flag can delete EFI and recovery partitions. Use only if you know what you are doing.
Confirm and exit
DiskPart confirms: "DiskPart successfully deleted the selected partition." Type exit to leave DiskPart, then exit again to close Command Prompt. Open Disk Management to verify the space shows as Unallocated.
After Deletion — What to Do with Unallocated Space
Extend an adjacent partition
In Disk Management, right-click the partition immediately to the left of the unallocated space and select Extend Volume. Follow the wizard to absorb all or part of the free space.
Create a new partition
Right-click the Unallocated space in Disk Management and select New Simple Volume. The wizard guides you through choosing size, drive letter, and file system.
Leave as unallocated (merge later)
You can leave space unallocated indefinitely. It will not be accessible until it is assigned to a partition. Use a third-party tool like AOMEI if the adjacent partition cannot be extended due to non-adjacent positioning.
Accidentally deleted the wrong partition? Stop writing any data to the disk immediately. Data recovery tools like DiskGenius Free can scan for and recover deleted partitions as long as the space has not been overwritten. Time is critical — act before any new data is written to that disk.