Access Methods Used

Table 1 lists the access methods that UNIX file systems can use.

Table 1. Access methods that UNIX files use
Access Method	Description	Reference
BSAM, QSAM	The application program sees the UNIX file as a single-volume, sequential data set that resides on DASD.	See Writing a UNIX File with BSAM or QSAM.
VSAM	Accesses a UNIX file as if it were an entry-sequenced data set (ESDS). UNIX files are the only type of data sets that you can access with both VSAM and non-VSAM interfaces.	See Simulated VSAM Access to UNIX files.
BPAM	Provides read-only access to UNIX files. BPAM treats a UNIX directory as a PDS or PDSE directory, and treats a UNIX file as a PDS or PDSE member. BPAM ignores any subdirectories in the directory that you specify. Restriction: You cannot use BPAM to write to a UNIX file.	See Reading UNIX Files Using BPAM.