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DASD

American  
[deyz-dee] / ˈdeɪz di /

noun

Computers.
  1. an external storage device, as a magnetic disk storage unit, in which the access mechanism and storage medium can be positioned directly at the addresses sought to read or write specific data items.


Etymology

Origin of DASD

d(irect-)a(ccess) s(torage) d(evice)