Though a partition is meeting the above 2 requirements, if it is formatted in FAT32 or other file system formats, then you will not get the option to extend the volume. If there is unallocated space somewhere on the same disk but not next to the partition at the right side, then the extend volume will be greyed out.ģ) Only NTFS or no file system (RAW) supported If the disk doesn’t have unallocated space, then you need to delete an existing partition next to it to get unallocated space.Ģ) The unallocated space should be on the precisely next (right side) of the partition that needs be extended. You can’t extend a volume across different drives. There should be unallocated space on the same disk where the partition you are going to extend. Here are the few basic requirements to get the option to extend a volume/partition when you do not have enough space on a partition.ġ) The disk should have unallocated space. Basic Requirements to get ‘Extend Volume’ Option in Windows OS Though it is a Windows 2019 server in this example, the below methods are applicable for Windows 2016/2012 R2 servers and client Operating Systems like Windows 10. By the way, this is a virtual machine on Azure cloud. If you shrunk drive D but extend C drive greyed out in Disk Management, there are 2 solutions with and without third party software.After digging all scenarios, I found out the reason why I was not able to extend the volume even though I have an empty space on the same disk next to the partition. If you use MBR disk, check if the right contiguous partition (D) is a Logical drive.
Therefore, if your system disk is GPT, reasons 1 is the most possible why Extend Volume greyed out for C drive. In most of personal computers and Windows servers, system C drive is formatted with NTFS by default. How to enable Extend Volume for system C drive The maximum size of a partition in MBR disk is 2TB, therefore, if C drive or other partition is 2TB, Disk Management cannot extend it even if there's right contiguous Unallocated space.
This is the reason why Extend Volume still greyed out after deleting the right contiguous partition. Likewise, Unallocated space can't be extended to any Logical drives. Unlike Primary partition, the disk space of Logical drive will be changed to Free after deleting, this Free space can't be extended to any Primary partition.
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