You can add hard disks, edit hard disks, and delete hard disk from a virtual machine. You do not have to power off virtual machines that are not fast provisioned to add or edit a virtual machine hard disk. Add a Virtual Machine Hard DiskYou can add a virtual hard disk to a virtual machine. Change a Virtual Machine Hard DiskYou can change the bus number and unit number of a virtual machine hard disk. Delete a Virtual Machine Hard DiskYou can delete a virtual machine hard disk. Parent topic: Editing Virtual Machine Properties