ram disk

Computing Dictionary

RAM disk definition

operating system, storage
A memory-resident program which mimics a hard disk drive. It uses part of computer's RAM to store data which can be accessed as files. Unlike a real disk drive, this drive forgets all stored data when the computer is turned off.
(1995-03-14)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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WordNet
ram disk

noun
(computer science) a virtual drive that is created by setting aside part of the random-access memory to use as if it were a group of sectors; "access to a RAM disk is very fast but the data it contains is lost when the system is turned off" 
WordNet® 3.0, © 2006 by Princeton University.
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