What is a virtual disk?
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A virtual disk (also known as a virtual drive or a RAM drive) is a file that represents as a physical disk drive to a guest operating system. The file may be configured on the host and also on a remote file system. The user can install a new operating system onto the virtual disk without repartitioning the physical disk or rebooting the host machine.
See also: virtual hard disk, virtual floppy drive, disk image