Increase C drive space

Increase C drive space in Windows 10

This article introduces how to increase C drive free space in Windows 10 without formatting or reinstalling OS. Increase system C drive space from D, E or any other volumes.

No matter you use OEM laptop/desktop or build the computer DIY, disk space of system C: drive and other data volumes are allocated. Many types of files write in to system C drive, so it’ll become full some day. What will you do in this situation? Actually, you can increase C drive space in Windows 10 without reinstalling Operating System and programs.

To increase partition size in Windows 10, there are two choices: Windows 10 native Disk Management and third party partition software such as NIUBI Partition Editor. In this article, I’ll introduce how to increase C drive disk space in Windows 10 (32 bit and 64 bit) with both tools.

Increase drive space with Disk Management

Windows 10 Disk Management has build-in Extend Volume functionality which can be used to increase partition size without losing data, but not every drive can be extended. In fact, Extend Volume only works when disk partition configuration meets the requirements below:

  1. Extend Volume is only valid for NTFS and RAW partition, FAT32 and other types of partitions are not supported.
  2. There must be adjacent Unallocated space on the right side of the drive that you want to expand.
  3. Free space in Extended partition cannot be added to Primary partition, even if it is right adjacent.

Because of the restrictions of both Shrink and Extend Volume functionalities, you can’t extend C drive by shrinking D in Disk Management. The only option is by deleting partition D to get adjacent Unallocated space.

Caution Do NOT delete drive D if you installed programs into it, remember to back up or transfer files before deleting a partition volume.

Steps to increase C drive space in Windows 10 Disk Management:

  1. Right click Windows on bottom left corner of the screen and then select Disk Management.
  2. Right click C drive and select Extend Volume.
  3. Extend Volume Wizard window will be opened, simple click all Next in this wizard.
  4. Click Finish to confirm and begin extending.

3rd party disk partition software has so such restrictions and it provides more options to shrink and extend hard drive.

Caution There is potential system damage and data loss risk while resizing disk partitions, so remember to make backup and select safe partition software. To ensure system and data intact, NIUBI Partition Editor provides 1 Second Rollback, Virtual Mode and Cancel-at-will technologies. It is the first choice to accomplish this task.

Increase C drive space from D or E

In most of the computers, there are other partitions in the same disk. If there is free space in any one of them, you can transfer into C drive. Operating System, all files, programs and corresponding settings keep the same. No other operations are needed even if you use any types of hardware RAID arrays.

Download NIUBI Partition Editor and you’ll see all connected storage device with partition structure. In my Windows 10 laptop, there are drive C, D, E and several system reserved partitions. Original drive C is 30GB and D is 50GB.

NIUBI Editor

Steps to increase C drive space from D in Windows 10:

Step 1: Right click drive D and select Resize/Move Volume, drag the left border rightwards or type an amount to shrink it.

Shrink D

As you see, 20GB free space is released from D and converted to Unallocated behind C drive.

Unallocated produced

Step 2: Right click C drive and select Resize/Move Volume again, in the pop-up window, drag the right border rightwards to combine the Unallocated space.

Extend C

C drive space is increased to 50GB by getting 20GB free space from D.

C drive extended

Tip This program works in its virtual mode and the operations are listed as pending on bottom left. To modify real disk partition, you need to click Apply to confirm.

If D drive is small, you can increase C drive space from E or other nonadjacent partitions. In this case, you need an additional step to move partition, watch the video:

Increase C drive size by cloning

If you cannot get free disk space from all other partitions in the same disk, you can clone to another larger disk with NIUBI, and then increase C drive with extra disk space.

In Summary

To increase C drive space in Windows 10, the native Disk Management only works in special condition, so you need third party professional partition software in most cases. As the safest partition tool, NIUBI Partition Editor provides several ways to resize partition safely and easily.