How to Merge Disk Partitions in Windows 10 and Windows 11

Can You Merge Disk Partitions in Windows 10 and Windows 11?

Yes, you can merge disk partitions in Windows, but the built-in tools do not offer a simple one-click "Merge" button. In most cases, merging partitions means deleting one partition to turn it into unallocated space, then extending the neighboring partition into that space.

For example, if your disk contains C: and D:, and you want one large C: drive, the usual built-in method is:

1. Back up all files from D:.
2. Delete the D: partition.
3. Extend C: into the newly created unallocated space.

When Merging Partitions Makes Sense

Merging partitions can be useful when one volume is running out of space while another has plenty of free storage. It is also common after upgrading an SSD, removing an unused recovery or data partition, or simplifying a disk layout that was previously split into too many volumes.

When You Should Not Merge Partitions

Avoid merging partitions if one of them contains a manufacturer recovery environment, BitLocker recovery data, a Linux installation, boot files, or another operating system. Deleting the wrong partition may make Windows unbootable or remove the ability to restore the computer from factory recovery media.

Before You Merge Partitions: Backup and Disk Layout Checklist

Partition operations are sensitive because they modify the disk structure. Even when the procedure is simple, a power failure, wrong disk selection, or mistaken delete operation can cause data loss. Spend a few minutes checking the disk layout before making changes.

1. Back Up the Partition You Plan to Delete

If you are going to delete D: and extend C:, copy everything from D: first. Use an external SSD/HDD, a network share, OneDrive, Google Drive, or another internal disk. Do not store the backup on the same partition that will be deleted.

2. Check Whether the Partitions Are Adjacent

Windows Disk Management can extend a volume only when the unallocated space is located immediately to the right of that volume on the same physical disk. If the partitions are not adjacent, the "Extend Volume" option may be unavailable.

3. Confirm You Are Working on the Correct Disk

If your computer has more than one drive, confirm disk numbers and sizes carefully. Disk 0 is often the system drive, but this is not guaranteed. External USB drives, NVMe SSDs, SATA HDDs, and virtual disks can all appear in the same list.

4. Suspend BitLocker If the Drive Is Encrypted

If BitLocker is enabled, save your recovery key and consider suspending BitLocker protection before changing partitions. After the operation, resume protection and verify that Windows starts normally.

How to Merge Partitions in Windows Using Disk Management

Disk Management is the easiest built-in graphical tool for merging adjacent partitions. It works in Windows 10 and Windows 11 and is suitable for most home users when the target layout is simple.

Step 1: Open Disk Management

1. Press Win + X or right-click the Start button.
2. Select Disk Management.
3. Wait until Windows loads the full list of disks and volumes.

You can also press Win + R, type diskmgmt.msc, and press Enter.

Step 2: Identify the Partition You Want to Keep

Decide which partition will remain after merging. Usually, this is the partition that needs more space, such as C: or a main data drive. Make sure the partition you want to delete is directly to the right of the one you want to extend.

Step 3: Back Up and Delete the Second Partition

1. Open the partition you plan to remove and copy all important files elsewhere.
2. Return to Disk Management.
3. Right-click the partition you want to delete.
4. Select Delete Volume.
5. Confirm the warning. The partition will become Unallocated space.

Step 4: Extend the Remaining Partition

1. Right-click the partition you want to enlarge, for example C:.
2. Select Extend Volume.
3. Click Next in the Extend Volume Wizard.
4. Use the full available unallocated space or enter a custom size.
5. Click Next, then Finish.

After the wizard finishes, Windows will show one larger partition. File Explorer should display the updated size immediately.

Merge Disk Partitions Through Windows Settings Storage Tools

Windows 11 and recent Windows 10 builds include modern storage management pages in the Settings app. These pages can show disks, volumes, and partition details, but the classic Disk Management tool is still more reliable for many resize operations.

Open Advanced Storage Settings

1. Press Win + I to open Settings.
2. Go to System → Storage.
3. Open Advanced storage settings.
4. Select Disks & volumes.
5. Choose the volume you want to manage.

Depending on your Windows version, you may be able to view properties, change drive letters, format volumes, or resize some partitions from this interface. If the required resize option is not available, open classic Disk Management instead.

How to Merge Partitions Using DiskPart Command Line

DiskPart is a built-in command-line partitioning tool. It is powerful, but it does not protect you from selecting the wrong disk or volume. Use it only if you are comfortable with command-line tools and have a verified backup.

DiskPart Scenario: Delete D: and Extend C:

The following example assumes you want to delete D: and extend C:. Replace the volume numbers with the correct numbers from your own computer.

1. Press Win + X and choose Terminal (Admin), Windows PowerShell (Admin), or Command Prompt (Admin).
2. Run diskpart.
3. List volumes and identify the correct volume numbers.

DiskPartdiskpart
list volume

After you identify the volume you want to delete, select it and remove it:

Delete the second partitionselect volume D
 delete volume

Then select the partition you want to enlarge and extend it:

Extend the remaining partitionselect volume C
extend
exit

When DiskPart Is Useful

DiskPart is useful in recovery environments, Windows setup, remote administration, and scripted deployment. For a normal desktop computer, Disk Management is usually safer because the graphical layout helps you see exactly what will be changed.

Can You Merge Partitions Without Losing Data?

Built-in Windows tools do not truly merge two populated partitions while preserving files on both. Disk Management and DiskPart can extend a partition only into unallocated space. That means one partition must be deleted first, and the files from that partition must be backed up manually.

Safe Manual Method Without Losing Files

1. Create a backup folder on another disk or external drive.
2. Copy all files from the partition that will be removed.
3. Delete the now-empty partition in Disk Management.
4. Extend the neighboring partition into the unallocated space.
5. Move the backed-up files back to the merged partition.

This is the safest method because you control the backup yourself and can verify that files are readable before modifying partitions.

Using Third-Party Partition Managers

Some third-party partition managers advertise a direct "merge partitions" feature. These tools may move files automatically and adjust the partition layout without manually deleting a volume first. However, the risk is not zero. A full backup is still strongly recommended before using any partition manager.

How to Merge C: Drive with Another Partition in Windows

Merging the C: drive with another partition is one of the most common requests because Windows, apps, browser caches, and updates can quickly fill the system partition. The process is possible, but only under the right disk layout.

Best Case: C: Is Followed Directly by D:

If your disk layout is C: → D:, you can back up D:, delete D:, and extend C:. This is the simplest and most reliable scenario for built-in Windows tools.

Problem Case: Recovery Partition Between C: and D:

Many modern Windows installations place a recovery partition after C:. If your layout is C: → Recovery → D:, Disk Management will not be able to extend C: into the space from D: because the unallocated space is not directly next to C:.

In that situation, you have three practical options:

• Use a trusted third-party partition manager that can move the recovery partition.
• Back up the system image and reinstall Windows with the preferred partition layout.
• Leave the recovery partition in place and move personal files or applications to the larger data partition instead.

Why You Cannot Merge Partitions: Common Problems and Fixes

Extend Volume Is Grayed Out

The most common reason is that the unallocated space is not directly to the right of the partition you want to extend. Disk Management cannot move partitions, so it cannot jump over another volume, recovery partition, or reserved partition.

The Partitions Are on Different Physical Disks

You cannot merge normal basic partitions from two different physical disks into one standard volume using Disk Management. Dynamic disks and Storage Spaces can combine disks in some configurations, but they are not the same as merging two ordinary partitions and are usually not recommended for beginners.

The File System Is Not NTFS

Disk Management can extend NTFS volumes more reliably than FAT32 or other file systems. If the partition is FAT32, exFAT, RAW, or from another operating system, some options may be unavailable. Back up the data before changing the file system or deleting the partition.

The Partition Is Protected

EFI System Partitions, Microsoft Reserved Partitions, OEM recovery partitions, and some hidden partitions are protected. Windows may not allow normal deletion through Disk Management. This protection exists because deleting these partitions can break boot or recovery functionality.

There Is Not Enough Free Space After Shrinking

If you are trying to shrink one partition first and then extend another, remember that unallocated space must appear in the correct position. Shrinking D: may create unallocated space after D:, not between C: and D:, which still prevents extending C:.

Best Ways to Merge Partitions in Windows: Which Method Should You Choose?

For most users, Disk Management is the best first option. It is built into Windows, visual, and relatively easy to understand. Use DiskPart only when you need command-line control, and consider third-party tools only when Windows cannot move or extend partitions in the required layout.

Frequently Asked Questions About Merging Partitions in Windows

The Safest Way to Combine Disk Partitions in Windows

The safest built-in way to merge partitions in Windows 10 or Windows 11 is to back up the partition you no longer need, delete it in Disk Management, and then extend the neighboring partition into the unallocated space. This works best when the partitions are adjacent and located on the same physical disk.

If the partitions are separated by a recovery partition or another volume, Disk Management may not be enough. In that case, use a trusted partition manager, redesign the disk layout during a clean installation, or keep the partitions separate and move personal files manually.