Adding virtual disks to virtual machines for Hyper-v Server

On Hyper-V Manager, right-click a virtual machine of you want to add virtual disk and select setting.

Select IDE Controller 0, one the IDE Controller page, select Hard Drive, and click Add.

Note: Generation 2 is  SCSI Controller.

You can select New to open a New Virtual Hard Disk Wizard or select Browse to add a existing virtual disk.

Then click OK.

Note: Generation 1 virtual machines need to be shut down to add virtual disks