How to change partition size in Windows Server 2012 (R2)?

All disk partitions are created when building the server, the partition size may not meed your needs after a period of time. The typical issue is system C drive running out of free space and becomes full. The free space in database drive is also very likely using up. It cannot be better if you can change the size of the drive that is lack of free space. By this way, you can fix this issue quickly without restarting from scratch. In this article I’ll show you how to change partition size in Windows Server 2012.

To do this, you may either try Server 2012 built-in Disk Management console or 3rd-party software. Comparing with Windows built-in utility, 3rd party software is much more powerful.

Resize under built-in Disk Management

To change the size of a drive, there are two options in Disk Management – Shrink Volume and Extend Volume.

Shrink Volume is used to reduce the size of a partition, conversely Extend Volume is used to increase the size of partitions.

1. Reduce partition size

Step 1: Open Windows Server 2012 Disk Management (right-click Windows on bottom left in Desktop, and then select Disk Management).

Step 2: Right click the drive you want to shrink and select “Shrink Volume“.

Step 3: Enter the amount of space to shrink. The default amount is all available space. Click Shrink to continue.

Partition size of the data drive D: reduced to 39.66GB from 59.66GB.

2. Increase partition size

Step 1: Right-click drive C: and select “Extend Volume…”

Extend Volume

Extend Volume Wizard will be launched, click Next to continue.

Extend Volume Wizard

Step 2: Select the available Unallocated space and click Next to continue.

Available space

Step 3: Confirm the operation, click Finish to proceed.

Complete extending

In a short time, the size of partition C increased.

partition combined
However, both Shrink Volume and Extend Volume are used for separate partition, that is to say, you cannot extend C drive by shrinking other drives. To do this, you need 3rd-party software such as Partition Magic Server.

Change partition size with partition software

Comparing with built-in Disk Management, server partition software is much powerful and easier to use. To change size of a partition, you just need to drag and move, steps:

Step 1: Download NIUBI Partition Editor, right click D: drive and select “Resize/Move Volume“.

Drag to resize

Step 2: In the pop-up window, drag the left border rightwards to generate free Unallocated space.

Shrink volume

You may also input a value for the Unallocated space directly.

Drag to resize

Click OK and back to the main window, where you’ll see 20GB Unallocated space created behind C: drive.

Unallocated space

Step 3: Drag the right border rightwards to hold the Unallocated space.

Drag to resize

Hold unallocated space

Step 4: Click OK and back to the main window, where you’ll see C drive extended to 60GB by robbing 20GB free space from D. Press Apply on top left to execute, done!

Partition resized

If there is not enough free space in the adjacent D drive, you can also get free space from the non-adjacent drive E.

This software is compatible with all kinds of hardware RAID, such as RAID 0, RAID 1, RAID 5, RAID 10, VMware, Hyper-V, HDD and USB disks.

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