How to resize a Windows partition

How to Extend a Windows Partition

When a Windows VPS storage is upgraded, the new space may not automatically be added to your existing C drive partition. This can happen if a hidden recovery partition is located between your C drive and the newly unallocated space. This guide provides a step-by-step process to extend your C drive by temporarily disabling and deleting the recovery partition, extending the C drive, and then recreating the recovery partition.

Step 1: Disable the Windows Recovery Environment

1. Open Command Prompt as an administrator.
2. Type reagentc /disable and press Enter.

Step 2: Delete the Recovery Partition

1. In the same Command Prompt window, type diskpart and press Enter.
2. Type list disk to view all your disks, then type select disk <number> (replace <number> with the disk that has the recovery partition).
3. Type list partition to see all partitions. Identify the recovery partition; it is typically less than 1 GB.
4. Type select partition <number> (replace <number> with the recovery partition's number).
5. Type detail partition and copy the Partition ID and Attributes. You will need this information to recreate the partition later.
6. Type delete partition override and press Enter to delete the recovery partition.

Step 3: Extend the C Drive

1. Open Disk Management. You should now see the unallocated space adjacent to your C drive.
2. Right-click on the C drive and select "Extend Volume".
3. Follow the wizard to add the unallocated space to your C drive.

Step 4: Recreate and Configure the Recovery Partition

1. Go back to Disk Management. Create a new 1 GB empty partition in the unallocated space that remains.
2. Return to the Command Prompt and type list partition.
3. Select the empty partition you just created by typing select partition <number>.
4. Set the Partition ID by typing set id=<partition_id> using the ID you copied earlier.
5. Set the attributes by typing set attributes=<attributes> using the attributes you copied earlie

Step 5: Hide the Recovery Partition

1. Type list volume to see a list of volumes.
2. Note the drive letter of the recovery partition and then type select volume <number>.
3. To hide the partition from File Explorer, type remove letter=<drive_letter>.
4. Type exit to leave DiskPart.

Step 6: Re-enable the Recovery Environment

1. In the Command Prompt, type reagentc /enable and press Enter. The process is now complete.

Updated on: 16/09/2025