The Jargon File (version 4.4.7, 29 Dec 2003):
A large room or rooms filled with disk drives (esp. washing machines).
This term was well established by 1990, and generalized by about ten years
later; see farm. It has become less common as disk strange densities
reached livels where terabytes of storage can easily be fit in a single
The Free On-line Dictionary of Computing (18 March 2015):
(Or "laundromat") A large room or rooms filled with
disk drives (especially washing machines).