The Jargon File (version 4.4.7, 29 Dec 2003):

disk farm
 n.

    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
    rack.


The Free On-line Dictionary of Computing (30 December 2018):

disk farm

    (Or "laundromat") A large room or rooms filled with
   disk drives (especially washing machines).

   [Jargon File]

   (1995-03-27)