There are many article which talks about vDisk expansion on different version of PVS but couldn’t find one for PVS 7.1 using windows 2012R2. Here I am sharing what I have done. Download vhdtool.exe from here. After downloading the tool follow this command as shown below
Once disk is attached it will showup as expanded volume . Select the disk and then choose extend volume.
Select the entire size and then next
Detach the hard disk post expansion