Error extending volume: Size Not Supported, During extending Operating System partition In Windows Server 2012

When I tried to Extend Volume for specific drive in Windows Server 2012 R2 by opening

  • Server Manager > File and Storage Services.

server manager file and storage services

  • Navigate to Disks > (I have unallocated free space (19.5GB)) > Right click on C Drive > Select Extend volume.

Expand Volume from server manager

  • The following dialog will be shown to set New size.

Expand Volume from server manager1

  • When I set the New size and clicked OK, I got “Extend failed” as shown below:

extend failed

  • I clicked on Extend failed to find out the reason, I got

Error extending volume: Size Not Supported

error extending volume size not supported

Cause:

This problem usually occurs because of there is a partition/drive between the original partition and the unallocated spaceThence, 

If you want to extend volume, you should make sure that there is no partition between the original partition and unallocated space.

Solution:

In this case, you will need to unallocated the F:\ drive space beside the operating system drive. but this mean all data in this drive will be deleted! So before you start to do this you should

  • Make sure that the unallocated space is greater than the F:\ drive (the drive beside OS drive) size to ensure that you can move the F:\ drive content to this space.
  • Create a new volume from the unallocated space.

New volume from Server manager

  • Move the data files from F:\ Drive to the New Volume.
  • Delete F:\ Drive.

delete volume from server manager

  • You are now having unallocated space beside the Operating System drive.
  • Again, try to extend the Operating System drive that should be now extended properly.

Enjoy 🙂

See also, How to extend a volume via Disk Managment in Windows Server 2012. 

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7 thoughts on “Error extending volume: Size Not Supported, During extending Operating System partition In Windows Server 2012

  1. I had a similar problem…..In my situation i had an extra volume (in my situation was the extra volume was called (F:) between the (C:) volume (the volume that i was planning to extend) and the unallocated space). I deleted the (F:) volume, and then i could extend the (C:) volume. Apparently there should be no volumes between the the (C:) volume and the unallocated volume.

    Like

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