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What is a DASD?

What is a DASD? What is its function, and why do we use it?
Direct Attached Storage Device, or DASD, is a term normally associated with mainframe or minicomputer storage subsystems. This acronym has evolved to include Direct Attached Storage (DAS) for open systems, Windows, Unix and Linux systems and is defined as a storage device, usually a spinning magnetic storage device such as a hard disk drive, that is directly connected to a system. DAS is usually directly connected with a SCSI, ATA or SATA system.

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