By Teresa / Last Updated January 26, 2021

Overview of “Size not supported” error during resizing partition

Situation 1: I’d like to increase the C drive partition space on the Windows Server 2012. It is 40 GB and I have only 50MBs left. There was no unallocated space so I deleted the data partition in order to create some space. However, when I try to extend C drive I get the error message: Error extending volume, size not supported. Any help will be appreciated.

Analysis: After using Windows Server 2012 for a couple of years, you will find the system becomes full. You are likely to get low disk space warning when installing some large-size applications. It is imperative to extend system drive under this circumstance. Deleting data partition and then extend system partition with that space is workable solution. Nevertheless, you may get above error randomly. The solution is deleting the adjacent partition in “Computer Management”, and then you are able to extend the volume with contiguous unallocated space.

Situation 2: When I try to shrink partition size to smaller capacity using PowerShell cmdlet, it gave me an error says, Resize-Partition: Size Not Supported. What does that mean? And how can I resize the partition size successfully? Thanks.

Analysis: When you encounter this error which probably means you try to shrink this partition to smaller than current used space. Shrinking or extending could be confusing in PowerShell because it uses different unit byte instead of MB. You can input “SizeMin” and “SizeMax” to identify how much space you can shrink by and then redo the task. Alternatively, you can do all of operations in simple, graphical and neat interface of some third party tools.

How to solve “Extend Volume, Size Not Supported” in Server?

AOMEI Partition Assistant Server is a trusty partitioning tool that designed for Windows Server OS, such as Server 2003, 2008, 2011, 2016, 2019 and of course Server 2012 (R2). It will help you solve “Size Not Supported” failed issue by using other advanced ways to resize partition: such as “Merge Partitions”, “Allocate Free Space ” or “Extend Partition Wizard”. More helpful functions like move partition, split partition, align partition, quick partition, also for advanced users, command line partitioning are embedded in this software.

What’s more, AOMEI Partition Assistant supports various device types. Except for common HDD, SSD, SSHD, it supports all hardware RAID (RAID 0/1/5/10) and virtual disk partition in VMware, Virtual Box, and Virtual PC and so on. So feel free to download its free trial and learn how to resize Server 2012 partition without losing data and format.

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Easily expand system volume in Server 2012

Step1. Install and launch AOMEI Partition Assistant. If you want to extend partition into non-adjacent space on the hard drive, complete it with “Merge Partitions”. The unallocated space could be recognized in the process. If you have free space in data partition instead of unallocated space, right click the redundant data partition and select “Allocate Free Space”.

Allocate Free Space

Step 2. Specify the value and select C drive as the destination.

Allocate Free Space From D To C Drive

Step 3. Click “Apply” and review the pending operations. At last, click “Proceed” to execute them.


Many solutions are practicable in resizing partition in Windows Server 2012. So when you face “Resize Partition: Size Not Supported” or “Error extending volume: Size Not Supported” issue, it’s not a bad idea to turn to third party software. In addition, AOMEI Partition Assistant Server also supports Windows PC OS like Windows 10, Windows 7 and Windows XP. Thus, installing Windows 10 on external hard drive is quite easy as well.