Clicking on the links in the table below will reveal a fuller description.

Non-VSAM Access Method(s)		Non-VSAM Data Organisation		VSAM Data Organisation
BSAM or QSAM		Sequential		ESDS
BISAM or QISAM		Indexed Sequential		KSDS
BDAM		Random / Direct		RRDS
BPAM		Partitioned		PDSE

The difference between Basic (B) and Queued (Q) access methods is that with Queued Access Methods the Operating System handles the data blocking and the application program only has to deal with a record at a time, whereas with Basic Access Methods the application program is responsible for handling data blocking and unblocking.

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