How to Resize a Disk Partition in Windows 10 and Windows 11

What Does Resizing a Disk Partition Mean in Windows?

Resizing a disk partition means changing the amount of space assigned to a specific volume, such as C:, D:, or another drive letter. In Windows 10 and Windows 11, you can usually perform two basic resize operations:

• Shrink Volume — reduce the size of an existing partition and create unallocated space.
• Extend Volume — increase the size of a partition by adding nearby unallocated space.

The most common reason to resize partitions is to make room for another volume, increase the size of the system drive, separate personal files from Windows, or use unused space after replacing or cloning a drive.

Before You Resize a Partition in Windows 10 or Windows 11

Partition resizing is usually safe when done correctly, but it still changes the structure of the disk. Before changing partition sizes, prepare the system and reduce the risk of data loss.

1. Back Up Important Files

Copy important documents, photos, archives, project files, and browser profiles to an external drive or cloud storage. A power failure, incorrect disk selection, file-system error, or hardware issue can make data inaccessible.

2. Check Which Disk You Are Editing

Open Disk Management and verify the physical disk number, partition name, drive letter, and capacity. Be especially careful if your computer has several SSDs, external USB drives, or memory cards connected.

3. Leave Enough Free Space for Windows

Do not shrink the Windows system partition too aggressively. Windows needs free space for updates, temporary files, restore points, hibernation, virtual memory, and application caches. For comfortable everyday use, keep at least 20–30 GB free on the C: drive.

How to Resize a Partition Using Disk Management in Windows

Disk Management is the easiest built-in tool for resizing partitions in Windows 10 and Windows 11. It provides a graphical view of each disk, partition, and unallocated area.

1. Press Win + X and select Disk Management.
2. Alternatively, press Win + R, type diskmgmt.msc, and press Enter.
3. Wait until Windows loads the disk list in the lower pane.
4. Find the partition you want to resize by checking the drive letter, label, and size.
5. Right-click the partition and choose either Shrink Volume or Extend Volume.

How to Shrink a Partition in Windows 10 and Windows 11

Use Shrink Volume when you want to make an existing partition smaller and create unallocated space. For example, you can shrink the C: drive to create a separate D: partition for files.

1. Open Disk Management.
2. Right-click the partition you want to reduce, such as C: or D:.
3. Select Shrink Volume.
4. Wait while Windows calculates available shrink space.
5. In the field Enter the amount of space to shrink in MB, type the amount of space you want to remove from the partition.
6. Click Shrink.
7. After the operation finishes, the removed space will appear as Unallocated on the same disk.

Example: Create 100 GB of Unallocated Space

Disk Management uses megabytes, not gigabytes. To shrink a partition by about 100 GB, enter approximately:

Size calculation100 GB × 1024 = 102400 MB

After shrinking, you can right-click the unallocated space and choose New Simple Volume to create a new partition, assign a drive letter, and format it as NTFS or exFAT.

How to Extend a Disk Partition in Windows

Use Extend Volume when you want to make a partition larger. This is often needed when the C: drive is running out of space or after cloning Windows to a larger SSD.

1. Open Disk Management.
2. Make sure there is Unallocated space immediately to the right of the partition you want to extend.
3. Right-click the target partition.
4. Select Extend Volume.
5. Click Next in the Extend Volume Wizard.
6. Choose the amount of space to add, or leave the default value to use all available adjacent space.
7. Click Next, then Finish.

If the operation succeeds, the partition size will increase immediately and the new capacity will be visible in File Explorer.

Resize a Partition from Windows Settings

Windows 11 and newer builds of Windows 10 include storage management options inside the Settings app. This interface is more modern than Disk Management, but it may not expose every advanced option on every system.

1. Open Settings with Win + I.
2. Go to System → Storage.
3. Open Advanced storage settings.
4. Select Disks & volumes.
5. Choose the disk and volume you want to manage.
6. Click Properties.
7. Use the available options to change size, format, or manage the volume.

The Settings method is convenient for basic storage management, especially on Windows 11. However, if you do not see the option you need, use the classic diskmgmt.msc tool instead.

How to Resize a Partition with DiskPart Command Line

DiskPart is a powerful command-line utility included in Windows. It is useful for advanced users, recovery environments, remote administration, and cases where the graphical tools do not work correctly.

Extend a Partition with DiskPart

Open Command Prompt as administrator or Windows Terminal as administrator, then run:

DiskPart: extend selected volumediskpart
list volume
select volume 3
extend
exit

Replace 3 with the correct volume number from your system. The extend command uses available unallocated space when possible.

Shrink a Partition with DiskPart

To shrink a selected volume by a specific amount, use:

DiskPart: shrink selected volumediskpart
list volume
select volume 3
shrink desired=51200
exit

In this example, desired=51200 means approximately 50 GB. DiskPart also uses megabytes for shrink operations.

How to Resize the C: Drive Safely in Windows 10 and Windows 11

The C: drive usually contains Windows, installed programs, drivers, user profiles, the page file, update cache, and restore point data. Because of that, resizing it requires more caution than resizing a secondary data partition.

To Shrink the C: Drive

1. Back up important files.
2. Disable or reduce large temporary files if necessary.
3. Open Disk Management and select Shrink Volume on C:.
4. Enter a moderate shrink amount and keep enough free space for Windows updates.
5. Create a new partition from the resulting unallocated space if needed.

To Extend the C: Drive

1. Open Disk Management.
2. Check whether unallocated space is immediately to the right of C:.
3. If yes, right-click C: and choose Extend Volume.
4. If no, Disk Management cannot extend C: directly. You may need to move or delete the partition between C: and the unallocated space, or use a third-party partition manager.

Why You Cannot Resize a Partition: Common Windows Limitations

Extend Volume Is Grayed Out

This is the most common issue. In Disk Management, Extend Volume is available only when unallocated space is directly to the right of the selected partition. If another partition sits between them, the option will be grayed out.

Shrink Volume Shows Too Little Space

Windows may not be able to move certain system files while the operating system is running. To increase available shrink space, you can temporarily disable hibernation, reduce or move the page file, delete restore points, run Disk Cleanup, and defragment an HDD. SSDs should not be manually defragmented like older hard drives.

Disable hibernation temporarilypowercfg /h off

After resizing, you can turn hibernation back on:

Enable hibernation againpowercfg /h on

The File System Is Not Supported

Disk Management works best with Windows-native file systems such as NTFS and exFAT. It cannot properly resize Linux Ext4, Apple APFS, or many specialized file systems.

The Disk Has Errors

If Windows detects file-system corruption, resizing may fail. Run a disk check before resizing:

Check and repair file-system errorschkdsk C: /f

If you check the system partition, Windows may ask to schedule the scan for the next restart.

Best Ways to Resize Partitions in Windows: Which Method Should You Use?

Frequently Asked Questions About Resizing Disk Partitions in Windows

Final Tips for Resizing Partitions in Windows 10 and Windows 11

For most users, the safest and simplest way to resize a partition is Disk Management. Use Shrink Volume to create unallocated space and Extend Volume to add adjacent unallocated space to an existing partition.

If the option you need is unavailable, the problem is usually the partition layout: Windows cannot extend a partition unless free space is immediately to its right. In that case, you may need to back up data, delete or move the blocking partition, or use a dedicated partition manager.