User Guide

Ampex 1308911-02 B-19
Device Special Files Introduction
Table B-7. Actions Controlled by DST/DIS Device Special Interface Parameters
Interface Parameter Action On Open Action While Open Action On Close
DST_APPEND_ONLY
Append only
Overwriting of data on
tape.
DST_DEF_POS_OPN
Set default position on
open
Initial position.
DST_IGN_FM
Ignore filemark on first
read
Read behavior when the
first read detects a
filemark before any data
is transferred.
DST_NO_FM
No filemark written on
close
Automatic writing of
filemark.
DST_NO_FLUSH
No flush
Buffering of write data
and filemarks.
Automatic flushing of the
buffer.
DST_NO_OPN_CMD
No commands issued on
open
Conditions under which
the open can succeed.
DST_NO_REFORMAT
No tape reformatting
Tape reformatting.
DST_NO_RESERVE
No reserve
Reserving the tape drive
for exclusive use.
DST_NO_REWIND
No rewind on close
Current position.
DST_OPEN_RDONLY
Open for read only
Write protect tape
cartridge.
DST_RETEN_OPN
Rewind on open
Initial position.
DST_SBLK_SIZE
Set user defined block
size on open
Data block size.
DST_SPC_FWD
Space forward on close
Current position.
DST_SYNC_WRITE
Synchronize (flush) tape
drive buffer after write
Automatic flushing of the
buffer after each write.
DST_WRITE_PROT
Write protect tape
cartridge
Write protect tape
cartridge.