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Extending the C drive on a Windows Server involves several steps, which can vary slightly depending on your server’s configuration and the version of Windows Server you are using. Here’s a guide:

1. Check Available Space

Before extending the C drive, you need to ensure that there is unallocated space on the same physical disk. If there’s no unallocated space, you’ll need to free up space or add a new disk.

• Open Disk Management:

Right-click the Start button and select Disk Management.

Alternatively, you can press Win + X and choose Disk Management.

• Check for Unallocated Space:
  Look for unallocated space on the disk where your C drive is located. If you don’t see any unallocated space, you may need to shrink another partition or add a new disk.

2. Shrink Another Partition (If Necessary)

If there’s no unallocated space, you may need to shrink an adjacent partition to create space.

• Shrink a Partition:

In Disk Management, right-click the partition adjacent to C (usually D or another drive) and select Shrink Volume.

Enter the amount of space you want to shrink. This space will be converted into unallocated space.

3. Extend the C Drive

Once you have unallocated space adjacent to the C drive, you can extend the C drive.

• Extend the C Drive:

In Disk Management, right-click the C drive and select Extend Volume.

The Extend Volume Wizard will start. Click Next.

Select the amount of space to add to the C drive from the available unallocated space. Click Next, and then Finish.

4. Using Diskpart (Command Line Tool)

If Disk Management doesn’t work, you can use the command line tool diskpart.

• Open Command Prompt as Administrator:

Press Win + X and choose Windows Terminal (Admin) or Command Prompt (Admin).

Type diskpart and press Enter.

• Use Diskpart to Extend Volume:

1. Type list disk and press Enter to see a list of disks.
2. Type select disk X (replace X with the number of the disk containing the C drive) and press Enter.
3. Type list volume and press Enter to see a list of volumes.
4. Type select volume Y (replace Y with the number of the C drive volume) and press Enter.
5. Type extend and press Enter. This will extend the C drive using all available unallocated space.

5. Verify the Changes

After extending the C drive, ensure that the changes have been applied successfully.

• Check Disk Space:

Open File Explorer and check the C drive’s properties to verify the new size.

• Verify in Disk Management:

Open Disk Management again to ensure the C drive reflects the increased size.