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Winchester

   magnetic-disk drives in which the read-write head planes over the
   disk surface on an air cushion.  The name arose because the
   original 1973 engineering prototype for what later became the
   IBM 3340 featured two 30-megabyte volumes; 30--30 became
   `Winchester' when somebody noticed the similarity to the common
   term for a famous Winchester rifle (in the latter, the first 30
   referred to caliber and the second to the grain weight of the
   charge).