pizza box

from Jargon File (4.4.4, 14 Aug 2003)
pizza box
 n.

   [Sun] The largish thin box housing the electronics in (especially Sun)
   desktop workstations, so named because of its size and shape and the
   dimpled pattern that looks like air holes.

   Two-meg single-platter removable disk packs used to be called pizzas,
   and the huge drive they were stuck into was referred to as a pizza
   oven. It's an index of progress that in the old days just the disk was
   pizza-sized, while now the entire computer is.
    
from The Free On-line Dictionary of Computing (8 July 2008)
pizza box

   [Sun] The largish thin box housing the electronics in
   (especially {Sun}) desktop {workstations}, so named because of
   its size and shape and the dimpled pattern that looks like air
   holes.

   Two megabyte single-platter removable disk packs used to be
   called pizzas, and the huge drive they were stuck into was
   referred to as a pizza oven.  It's an index of progress that
   in the old days just the disk was pizza-sized, while now the
   entire computer is.

   [{Jargon File}]
    

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