The process of of attaching and detaching, etc Sometimes you need to add an entry to the boot menuģ. A virtual hard drive can disappear after a restart (the most common problem)Ģ. But there can arise minor difficulties, for example:ġ. If you need to use more than one operating system, often the best choice is installing secondary (or more) operating systems to a VHD. You can add, remove, and edit files on them, or create a fresh installation of Windows to a new, bootable VHD. When mounted, they appear to Windows as a real physical hard drive. Hard drives for virtual machines, but they can also be mounted so they act like real hard drives. VHDs are single files and are most commonly used as Think of it as a fancy ZIP file, but without the compression. A VHD is a large container file that simulates the file structure of a hard drive.