You cannot choose to make Unallocated space in front of of end of this partition. If possible, you may also delete an allocated partition, and then all its disk space will be convert to Unallocated.That means, Extend Volume is not workable if you do not shrink or delete other partition first.Reason 2: Unallocated space is not behindThis is the most common reason why Extend Volume greyed out.When shrinking a volume, the only option for you is entering an amount or clicking Shrink to use default maximum available unused space. Unused space cannot be transferred to other partitions directly, you should shrink it and convert part of used space to Unallocated first. Of course it is impossible to a physical component.The usable space include unused space in other partitions, or Unallocated space. Reasons why Extend Volume greyed out in Windows 10 DMReason 1: No usable disk spaceBefore extending a volume, there must be usable space in the same disk (or RAID array), otherwise, a 250GB hard disk will be increased to 300GB. Find out the same reason with yours and use corresponding solution. In this article, I'll shows you all probable reasons why Extend Volume greyed out in Windows 10 Disk Management. If you copy all of your data off of D: and delete the partition, you will be able to extend your C: Drive to your hearts content, then you can recreate and copy back the data to your D.īesides basic ability to delete, format and create new partition, Windows has advanced Shrink and functions to help without losing data.Both functions are easy to use, but many feedback that Extend Volume is always grayed out even after shrinking another partition. You wont be able to extend your C: with D: on the same drive. Disk management of Windows Client OS or Server OS is not a perfectly partition managing tool, it has some limitations. Shrink Volume grayed out in Disk Management Reason of Shrink Volume greyed out. Right click on it and you will find the 'Extend Volume' greyed out.

There are C drive, D drive and unallocated space on the Disk 0.

Why extend volume greyed out Launch Windows Disk Management snap-in.

Windows extend volume greyed out