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. 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.