But many of you may suffer from the low space error on Windows 10.

You canmove unallocated space to C driveto fix this problem easily.

Here are three methods for you to extend the C drive space.

extend the C drive

Step 2: SelectCdrive, then selectExtend Partitionon the left pane.

After that, adjust the button to determine how much space you want to add to the C drive.

Step 4: ClickOKto preserve your change.

extend the C drive with Disk Management

After all these steps, you have added unallocated space to the C drive successfully.

But the unallocated space should be adjacent to and behind the C drive.

you’re able to work with the following steps if the condition is met.

select the amount of space

Step 1: Right-select theWindowsicon and chooseDisk Managementfrom the menu.

Step 2: Right-press theCdrive, then selectExtend Volumefrom the context menu.

Step 4: ClickFinishto confirm the decision and complete the operation.

run the diskpart command lines

Disk Management will execute the decision you made on the disk immediately.

Therefore, you should be careful when making changes.

Here, I will introduce you to how to add unallocated space to C drive with this tool.

Step 1: PressWin + Rto pop fire up Run window.

Step 2: Typecmdinto the text box and pressShift + Ctrl + Enterto run Command Prompt as administrator.

Step 3: punch in the following command lines and hitEnterat the end of each.

Final Words

All the methods above can help you add unallocated space to C drive without formatting.

But you should be careful when making changes to the C drive.

Hope this post can give you some useful information.