What is Virtual Hard Disk (VHD)? | Networking

   VHD is a disk image file format that provides storage for a virtual machine. When you create a virtual machine, you have the option of creating a single VHD, as it requires at least one  VHD to install one operating system. If you want to provide more storage for a virtual machine, you can add more than one VHD to the virtual machine. Each virtual machine can have a maximum of three VHDs.
Following are the two main types of VHD:
?    Fixed-size —Refers to a VHD that automatically takes up the specified amount of physical disk space on the host computer's file system
?    Dynamically expanding —Refers to a VHD that allocates space only when it is required