SCSI Tape status codes in Linux

Status Bit   Description
BOT          The tape is positioned at the beginning of the first
            file.
EOT          A tape operation has reached the physical End Of
            Tape.
EOF          The tape is positioned just after a filemark.
WR_PROT      The tape (or drive) is write-protected. For some
            drives this can also mean that the drive does not
            support writing on the current medium  type.
ONLINE       The drive has a tape in place and ready for
            operation.
DR_OPEN      Door is open. Depending on the type of drive, this
            usually means that the drive does not have a tape in
            place.
IM_REP_EN    Immediate report mode. This bit is set if there are
            no guarantees that the data has been physically
            written to the tape when the write call  returns. It
            is set to zero only when the driver does not buffer
            data and the drive is set not to buffer data.
SM           The tape is currently positioned at a setmark. DDS
            specific.
EOD          The tape is positioned at the end of recorded data.
            DDS specific.
D_6250
D_1600
D_800        This "generic" status information reports the current
            density setting for 9-track 1/2 inch tape drives only.