User Manual

SCSI Commands Reference Manual, Rev. J 466
www.seagate.com Parameters for direct access devices
IL (INQUIRY Length) bit
1 When the INQUIRY Length (IL) bit is set to one, the standard INQUIRY data available to a host is limited to the 36 bytes required by the
SCSI-2 specification.
0 When the IL bit is set to zero, 148 bytes of standard INQUIRY data are available. The Additional Length field in byte 4 of the INQUIRY data
is updated to reflect the actual number of additional bytes available.
UNIT ATTENTION bit
1 When the UNIT ATTENTION bit is set to one, then UNIT ATTENTION is logged in sense only; no CHECK CONDITION status is presented fol-
lowing any reset.
0 When this bit is set to zero, then Check Condition is presented for all affected initiators following a reset until REQUEST SENSE is issued
by each initiator (as per current operation).
ROUND bit
1 When the ROUND bit is set to one, the drive treats and reports rounded parameters as described in 2.3.
0 When ROUND is set to zero, the drive shall round the parameter and handle command completion reporting as if the parameter had not
been rounded.
STRICT bit
1 When the STRICT bit is set to one, the drive checks for initiator attempts to change unchangeable parameters. If the drive detects an
attempt, it rejects the command in the standard way, i.e., CHECK CONDITION status from drive, REQUEST SENSE from the initiator, and
Illegal Request Sense key (5h) back from the drive.
0 When the STRICT bit is set to zero, the drive ignores the values of the unchangeable parameters in a MODE SELECT command. The drive
does not reject the command trying to change unchangeable parameters or trying to send a mode page that is shorter than the sup-
ported length.
Caution: Utilization of this forgiving option by a SCSI initiator port that does not analyze the impact of the truncation could adversely
affect data integrity.
SCSI-2 bit
1 When set to one, the SCSI-2 bit changes the following SCSI-3 features from their SCSI-3 definition to the SCSI-2 definition:
a) Control Mode Page (0Ah) Length from 0Ah to 06h; and
b) Caching Page (08h) Length from 12h to 0Ah.
0 When S2 is set to zero, all features remain as specified in other portions of this specification.
TTE (Thermal Throttle Enable) bit
1 If set to 1, drive activity is limited based on temperature.
0 If set to 0, drive activity is not limited-based on temperature.