Extend Volume Not Available in Windows 10: Fix Using CMD

Extend Volume Not Available in Windows 10/11: Fix Using CMD

I want to extend my C drive volume as I've created an OVA File with a 15GB hard disk attached to it. I need to increase the space, but the problem is that the Extend Volume option is grayed out in my Windows 10 Disk Management. To make the Extend Volume option clickable, we need to delete the recovery partition sitting between the C Drive and unallocated space. The C drive (or the drive you want to extend) needs to be next to the drive you want to extend for the Extend Volume option to be highlighted.

Q. How to Check Disk Management in Windows 10?
Ans. -Press Win + R, type compmgmt.msc, and click on Disk Management.
- You will be able to see the entire partition table.

Q. How to Create Unallocated Space in Windows 10/11?
Ans. -Go to Disk Management and delete any useless or empty partitions.
- The deleted space will be highlighted in black, representing unallocated space.
- You can later assign this space to other drives or create a new drive from it.


The reason behind "Extend Volume" is grayed out in your Windows 10 or 11 is that there is a Recovery drive between the C: drive and the unallocated space in your VM/Main OS. To fix this, why don't we delete the recovery partition to align it in the same way shown below:

The partition table:
Before deleting Recovery Partition:
EFI Partition | C Drive (15GB) | Recovery Partition | Unallocated space (50GB)

After Deleting Recovery Partition:
EFI Partition | C Drive (15GB) | Unallocated Space (50GB)

After Creating Recovery Partition:
EFI Partition | C Drive (65GB) | Recovery Partition (1GB)

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Step 1
----Disable the recovery mode
# Disable to recovery mode
# Run cmd as admin
$ reagentc /disable

Step 2
---Delete the Recovery partition To extend
- Run CMD as Admin
$ disk part
$ list disk
$ select disk 0
$ list partition
$ select parttition 3
$ delete partition override
- Extend volume must be highlighted

Step 3
---Create new parttion of 1GB
- Shrink 1GB of space from C: or any Drive to create a Recovery partition again
- Create a new partition with unallocated space
- No label
- Name partition as 'System Reserved'
- Save it

Step 4
---
- Assign ID to 'System Reserved' Partition
$ diskpart
$ list disk
$ sel disk 0
$ list partition
$ select partition 3
$ det par
$ set id=27
$ det par
$ exit
- ID must have been changed to 27


Step 5
---Enable recovery mode
Run cmd as admin
$ reagentc /enable
$ reagentc /info

Step 6
---
Get into recovery mode to verify if everything is fine
- Press Shift + Restart > Troubleshoot > Advance > Command prompt

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