Increase C: drive space in Windows Server 2012

Updated on: June 5, 2019

This article introduces how to increase C: drive space in Windows Server 2012 without losing data. 3 ways to increase size of system partition volume.

Increase C drive space in Server 2012 Disk Management

When system partition C runs out of space, many people want to increase free space without reinstalling OS or restoring from backup. Then is it possible to increase C drive space in Windows 2012 Server without losing data? It depends.

No matter which tool you choose, remember to back up or transfer files first.

How to increase size of C drive via Server 2012 Disk Management?

Your disk partition configuration must meet the preconditions including:

Although there is Shrink Volume function to reduce partition, but Unallocated space can only be made on the right side. Extend Volume cannot combine this Unallocated space to the right contiguous volume or any nonadjacent partitions.

As you see in my server, Extend Volume is disabled for both C: and E: drive after shrinking D.

The only way to enable Extend Volume for C drive is by deleting D to get adjacent Unallocated space.

Don't do this if you installed programs or any Windows services are running from D drive.

If you can delete D, simply right click C drive and select Extend Volume. Then you can increase C drive space by several clicks.

Extend volume disabled

Increase size of C drive by shrinking from D or E

Obviously, Disk Management is not the best tool. BTW, another native tool Diskpart command has the same restrictions with Disk Management.

With server partition software, there are no such limitations. You can shrink a partition and make Unallocated space on either side. This Unallocated space can be combined to either contiguous partition or moved to any nonadjacent volumes.

However, as I said in the beginning, some unreliable software can cause system and data damage. Because disk partition parameters should be modified, files should be moved to new locations, system associated files must be updated. Any slight error leads to Windows, partition or files damage.

Better than other software, NIUBI Partition Editor has innovative 1 Second Rollback technology, which is able to roll back server automatically and in a flash if encounter any error. If it happens, server could back online rapidly without modification. In addition, it has other powerful technologies to protect data and save time, for example:

Download NIUBI Partition Editor and follow the steps in the video to increase C: drive space in Windows Server 2012 from other partitions:

Video guide

Increase system partition space from other disk

From the feedback, in some servers there are no other partitions in the same disk. In that case, no partitioning software can add space to C drive from another separated disk. Instead, you need to copy the entire disk to a larger one and increase size of C drive with extra disk space. A hard disk is physical unit and the size is fixed.

Follow the steps in the video to increase free space of system partition C in Windows Server 2012 with other disk:

Video guide

In Summary

Windows native Disk Management cannot extend a partition by shrinking other one, so it is useless in most cases. Back up the server and use safe software to resize partition. Because of many unique technologies, NIUBI Partition Editor helps decrease and increase partition size fast and safely.

Check your disk partition configuration and use the corresponding method in the video. If you still have any questions, contact the online support, it's 24/7.