The following additional commands are supported for CD-ROM mode:

08h

READ 6

43h

READ TOC

28h

READ 10

2Bh

SEEK

25h

READ CAPACITY

1Bh

START/STOP UNIT

For implementation details on these commands, see Chapter 3, “Commands—introduction”and Chapter 4, “Commands”.

SCSI features

Design approach

The features supported by the drive are based on standards, both official and de facto. The drive is fully compliant with the current SCSI standards: SPC3, SSC2, SAM2, and the relevant transport protocol (e.g. SPI4 for the parallel SCSI drive). All mandatory commands and features are supported, as well as some that are optional. In addition, some features from older standards are still supported for backwards compatibility.

Power-on

The drive will respond to INQUIRY, TEST UNIT READY, REPORT LUNS and REQUEST SENSE commands within 250 ms of power on. The first command received from an initiator (other than INQUIRY and REQUEST SENSE) will result in CHECK CONDITION status, with UNIT ATTENTION sense data reported for the power on. Once the drive has completed its self-test and set-up procedures, it will attempt to reload any tape that is already present in the drive. It may take some time to recover the tape, especially if it was positioned near EOM when power was cycled. During tape recovery, medium access commands will result in a sense key of NOT READY, with additional sense of 0401h (drive in process of becoming ready).

Reset strategy

The drive supports reset as follows:

•The current I/O process is aborted

•Any queued I/O processes from other initiators are removed

•All negotiated settings are cleared (parallel SCSI drives only)

•Mode parameters are cleared to their default values

•Any reservations are cleared (but not persistent reservations)

•Any buffered writes are flushed to tape

•The logical position becomes undefined, unless Rewind-On-Reset has been configured in which case the drive will rewind to BOM

Interface Implementation

SCSI features 13