There is a common issue on Windows to have a disk blocked from Windows recovery partition. In that way, if you extend the physical disk (virtual environments) you cannot extend from Operating system side.
A recovery partition is a partition on the disk that helps to restore the factory settings of the OS (operating system) if there is some kind of system failure. This partition has no drive letter, and you can use only Help in Disk Management. In my case I did not need this partition and I was able to delete it with the below steps:
select disk 0
select volume 3 (3 was the id of my recovery partition)
delete volume ovveride
After those steps you will be able to extend your disk.
Hyper-V includes a tool that can convert vhd disks to vhdx which is the newer version and should be used on production environments.
Sometimes the below error can occur which prevents one from attaching the new disk (vhdx) to the virtual machine needed. It seems as the new disk after the conversion to be locked and only by rebooting host the disk can be attached.
The process cannot access the file because it is being used by another process
This issue happens because the original disk is attached on the virtual machine during the conversion. The disk device should be attached as stated from Microsoft (link below). After the conversion the new disk can be attached and will not be locked from the host.
The easiest way to perform massive identical installations on web servers that are located on the same network (VLAN) is through a network map of the remote location. With only two steps you can perform remote installations.
Firstly select map a network drive and assign a drive letter to the remote location.
Select your preferred drive letter.
change directory to your remote location through a cmd or GUI and perform your installations.