(Direct Access Storage Device) Pronounced "daz-dee." A peripheral storage device that is directly addressable. Although DASDs used to refer to magnetic disks and drums, today, DASD means magnetic disk. The term is used mostly in the mainframe world. See magnetic disk and disk drive.
Because the Channel Redrive approach eliminates the ability of direct access storage devices (DASD) to reconnect over multiple paths, the Millennium design is more efficient, yielding equivalent or higher I/O rates and at the same time offering greater DASD access and lower cost.