Move Disk Space Between C and D Drives on Windows 11, 10, 8, & 7

Move disk space from your D drive to your C drive in just a few simple steps

Written by Nicole Levine, MFA

Last Updated: July 11, 2025 Fact Checked

This wikiHow teaches you how to get extra space on your PC's C drive by allocating space from another partition. Fortunately, your Windows PC comes with a free tool called Disk Management that makes it simple to reallocate unused disk space to a drive that can use some extra room. This will only work if your C and D "drives" are separate partitions on the same drive—you cannot transfer disk space between physical drives.

Quick Steps

Run Computer Management as an administrator.
Click Disk Management.
Right-click the D drive and select Extend…
Click Next.
Select how much space to allocate to the C drive.
Click Next and then Finish.

Steps

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A context menu will expand.^{[1]
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This opens the Computer Management tool with administrative rights.^{[2]
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It's on the left panel. A list of disks and partitions will appear on the right.
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Right-click the D drive and select Extend Volume. This opens the Extend Volume Wizard.^{[3]
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- If the option is grayed out, you may not be running Computer Management as an administrator, or the volume is formatted with a file system that cannot be extended.
- You also won't be able to select this option if your C and D drives are two separate drives (such as an HDD and SSD, two HDDs, or two SSDs). You can only transfer disk space to your C drive if the C and D partitions are on the same drive.
- It is also possible that there's unallocated space right after the select volume (check that lower-right box for the word "Unallocated"). If there is another volume between the selected partition and the unallocated area, you can delete that volume from the middle to allocate that space to the D drive. But if you do this, you'll lose any data on that middle volume.
The default value selects all available free space, but you can always customize this if you want to allocate less.^{[4]
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Now you'll see a confirmation screen.
After a few moments, the selected amount of space will be added to your C drive.^{[5]
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