virtual disk - A simulated disk drive, or a part of memory that acts as a logical disk drive, whose contents are actually stored in RAM memory. A RAM disk is very fast because an electronic rather than a physical storage device is accessed, thus creating less work and increasing speed. A RAM disk can be used to copy files more quickly. For example, if there are several copies of the same set of files to be made, those files can be copied to the RAM disk and then to diskettes. Similarly, a program that runs slowly can be copied from the hard drive to the RAM disk, and it will run faster. The RAM disk can be used for anything a physical disk drive would be used for, such as running programs. There are a few disadvantages, though. First, system memory is given up in order to create a RAM disk, and, second, the contents of a RAM disk usually are lost when the computer is turned off. Also called a RAM drive or virtual disk.;
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