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Direct-access storage device
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===OS/360 and successors=== OS/360 through [[z/OS]] support datasets on DASD with the following access methods: {{Citation needed|date=September 2024}} * [[Basic sequential access method]] (BSAM) * [[Basic indexed sequential access method]] (BISAM) * [[Queued sequential access method]] (QSAM) * [[Queued indexed sequential access method]] (QISAM) * [[Basic partitioned access method]] (BPAM) * [[Basic direct access method]] (BDAM) * [[Virtual storage access method]] (VSAM) * [[Execute Channel Program]] (EXCP) * [[Execute Channel Program in Real Storage]] (EXCPVR) In [[MVS]], starting with [[OS/VS2]] Release 2 and continuing through [[z/OS]], all of the access methods including EXCP[<nowiki/>VR], use the privileged [[Start Input/Output|STARTIO]] macro.
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