Logical blocks for SAM files

The format of the logical blocks is defined in the FILE and FCB macros via the BLKCTRL operand and in the ADD-FILE-LINK command via the BLOCK-CONTROL-INFO operand. SAM files can contain records with the format F, V or U.

The size of the record must not exceed the block size. The maximum block length for nonstandard blocks is 32768 bytes for SAM tape files.