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Basic direct access method

Basic Direct Access Method, or BDAM is an access method for IBM's OS/360 and successors computer operating systems on System/360 and later mainframes. BDAM "consists of routines used in retrieving data from, and storing data onto, direct access devices.": p.5 BDAM is available on OS/360, OS/VS2, MVS, z/OS, and related high-end operating systems.

Applications, Application program interface & Description

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Application program interface

Data Control BlockExtentsVolumeContiguousAsynchronously
8 related topics

Description

Data setsBlocksRelative trackKeysUnix
7 related topics

Disk addresses

IBM 2321 Data Cell
1 related topics

Overview

Access methodOS/360 and successorsOperating systemsSystem/360Mainframes
10 related topics

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Description

Application program interface

Disk addresses

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Basic direct access method

Nodes31
Edges30
Triples2
Avg. degree1.94
Density0.064516
Components1

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data bdam block track number used file direct ibm device record access addresses blocks relative key must os operating systems

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Unixinstance ofin other operating systems0.80text
Windows.BDAM is still supported by IBM as of 2026instance ofin other operating systems0.80text

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