
A direct-access storage device (DASD, pronounced iː) is any secondary storage device in which `each physical record has a discrete location and a unique address.` IBM developed DASDs for use with mainframe computers and some minicomputers. Disk drives, magnetic drums, and data cells, and optical disc drives are all classified as DASDs. DASDs ac.....
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http://en.wikipedia.org/wiki/Direct-access_storage_device

(from the article `computer science`) When so-called direct-access storage devices (DASDs; primarily magnetic disks) were developed, it became possible to access a random data block on ...
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http://www.britannica.com/eb/a-z/d/53
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