Direct-Access Storage Device - définition. Qu'est-ce que Direct-Access Storage Device
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Qu'est-ce (qui) est Direct-Access Storage Device - définition

SECONDARY STORAGE DEVICE
Direct Access Storage Device; Dasd; Direct access storage device; DASD

Direct-Access Storage Device         
<hardware> (DASD) IBM mainframe terminology for a {disk drive}, in contrast with a tape drive which is a sequential access device. (1995-03-01)
Direct-access storage device         
A direct-access storage device (DASD) (pronounced ) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives.
DASD         
Direct Access Storage Device

Wikipédia

Direct-access storage device

A direct-access storage device (DASD) (pronounced ) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives. Later, optical disc drives and flash memory units are also classified as DASD.

The term DASD contrasts with sequential access storage device such as a magnetic tape drive, and unit record equipment such as a punched card device. A record on a DASD can be accessed without having to read through intervening records from the current location, whereas reading anything other than the "next" record on tape or deck of cards requires skipping over intervening records, and requires a proportionally long time to access a distant point in a medium. Access methods for DASD include sequential, partitioned, indexed, and direct.

The DASD storage class includes both fixed and removable media.