How to extend C partition

I've tried disk management but extend option is grayed out.

When I upgraded to windows 10 it split the drives into C and D. The D had files that didn't belong to me, so I deleted them.

Hi Kevin,

Thank you for posting your query on Microsoft Community.

I would suggest you try the following steps and see if it helps.

1. Right-click on the partition (in your case, Data) and select Delete Volume.

2. When the prompt appears click Yes.

3. The partition will now display as Unallocated.

4. Now, right-click on C: Drive and select Extend Volume.

5. Click on Next. If you wish to extend all the unallocated partition to C: drive, then click Next otherwise next to select the amount of space in MB text box type in the space (in MB) to merge with C: drive.

6. Click on Finish.

Note: In disk management, D: drive must be next to the C: drive on the right-side only then you can extend C: drive.

Hope this helps. Please respond if you have further related queries.

Regards,

Jesinta Rozario

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Hi Kevin,

Thank you for posting your query on Microsoft Community.

I would suggest you try the following steps and see if it helps.

1. Right-click on the partition (in your case, Data) and select Delete Volume.

2. When the prompt appears click Yes.

3. The partition will now display as Unallocated.

4. Now, right-click on C: Drive and select Extend Volume.

5. Click on Next. If you wish to extend all the unallocated partition to C: drive, then click Next otherwise next to select the amount of space in MB text box type in the space (in MB) to merge with C: drive.

6. Click on Finish.

Note: In disk management, D: drive must be next to the C: drive on the right-side only then you can extend C: drive.

Hope this helps. Please respond if you have further related queries.

Regards,

Jesinta Rozario

the delete volume is grayed out

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Hi Kevin,

Thank you for the information provided.

Please to inform you that you need to have an “unallocated disk space” to the right of the Partition\Volume you wish to extend on the same drive. Only when “unallocated disk space” is available “extend” option is highlighted.

I suggest you to try these steps and check if they helps.

Step1: Press Windows + R and Diskmgmt.msc and try the following

a. Right click the basic volume want to extend.
b. Click extend volume.
c. Follow the instruction on the screen.

Step2: Open a command prompt and type diskpart.
At the DISKPART prompt, type list volume. Make note of the basic volume you want to extend.
At the DISKPART prompt, type select volume


Hope this helps. If the issue remains unresolved, please get back to us and we would be happy to help.
 

 

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Hi Kevin,

Thank you for the information provided.

Please to inform you that you need to have an “unallocated disk space” to the right of the Partition\Volume you wish to extend on the same drive. Only when “unallocated disk space” is available “extend” option is highlighted.

I suggest you to try these steps and check if they helps.

Step1: Press Windows + R and Diskmgmt.msc and try the following

a. Right click the basic volume want to extend.
b. Click extend volume.
c. Follow the instruction on the screen.

Step2: Open a command prompt and type diskpart.
At the DISKPART prompt, type list volume. Make note of the basic volume you want to extend.
At the DISKPART prompt, type select volume


Hope this helps. If the issue remains unresolved, please get back to us and we would be happy to help.
 

I don't understand stemp 2. What's the volume number for C:? What do I put for [size=

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Hi,

download and install free minitool

GoodLuck

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i like the approach of Jesinta Rozario , as long as the data of D: not needed . If needed , might look at this :

Let assume : C: is 50GB , D: is 450GB( used 200GB , free 250GB) . Goal : C:= 75GB

1. Defrag C: and D:
2. Shrink D: by 25GB , use Windows  options
3.Use EaseUs Partition Master Free to :
3.1 Move partition D: to the right by 25GB 
3.2.Resize C: , to the right by 25GB
the pending operations (2) need restart

*presuming C: is on the left and D: on the right and there is no other partition between them . also we speak about hdd

http://answers.microsoft.com/en-us/windows/forum/windows_7-performance/how-to-extend-system-drive-partition-c-to-get-more/6acd8697-4292-4280-8270-049691d14598

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Minitool is a  powerful tools, it doesn't care if their is a partition between C and D , you can Move/Resize Partition until to be able to extend your C drive

Regards

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Last updated March 22, 2025 Views 166,140 Applies to: