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DASD

[deyz-dee]
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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.
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Origin of DASD

d(irect-)a(ccess) s(torage) d(evice)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018