Backward space over count file marks. The tape is positioned at the
the BOT (Begin Of Tape) side of the last skipped file mark, which
means that `mt -f /dev/qft0 bsfm
' (i.e. count set to
`1
') positions at the end of the previous volume.
Note for zftape: it is nevertheless impossible to use MTBSFM
to
append data to a tape volume. Since version 3.03 all write access
to the tape is illegal when using zftape unless the tape
is located at either BOT (Begin Of Tape) or EOD (End Of
Data, end of the area that already is occupied by data). EOD is
defined to be the location after the last file mark.
mt -f /dev/nqft0 bsfm
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