Quantum Audio Travan 40 Tape Drive STT3401A - Manual (Page 63)

ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 55
Write Delay Time: This field indicates the maximum time, in 100 millisecond
increments, that the drive shall retain buffered data without subsequent write or
synchronizing commands before forcing it to the media. Filler blocks containing
invalid filler data required to fill out ECC frames will accompany data forced to tape.
A value of 00 00h indicates data will never be forced to tape. Valid values are 00 00h
and up to 10 00h (27.3 minutes). Invalid values will be rounded up. The default value
is 00 00h and this field is changeable.
Data Buffer Recovery is set to 0 and the RECOVER BUFFERED DATA command
is not supported and will not be accepted.
BIS: A Block Identifiers Supported (BIS) bit is reported as 1 in MODE SENSE. This
field is non-changeable.
RSMK: The Report Setmark (RSMK) bit, if set to 1, instructs the drive to report
Setmarks by the same rules applying to Filemarks. If set to 0, Setmarks will be
ignored when reading, and commands to write Setmarks will not be accepted. This
value is 0 by default and is not changeable. Setmarks are not supported
AVC: The Automatic Velocity Control (AVC) bit enables the Auto-Throttle feature.
When set to 0, the tape speed is set by the speed code in the device specific
parameter byte. When set to 1, the drive uses Auto-Throttle to reduce tape speed
from the Speed Code setting to minimize repositioning of the tape. The adjusted tape
speed will be reported in MODE SENSE.
NOTE: If Speed Code 0h is used with AVC on, the drive will default to 92 ips (2.0
Mbytes/Sec native transfer rate). If the system is unable to sustain streaming
at that rate, the drive will Auto-Throttle to the lower speed (56 ips). At the
beginning of each track, the drive will increase speed to 92 ips in an attempt
to increase throughput.
SOCF: Stop On Consecutive Filemarks bit is not a supported function and must be
set to 00b.
BRO: Recover Buffered Order bit determines the order in which data will be returned
to the Host for a RECOVER BUFFERED DATA command. When set to 1, the data
blocks will be returned to in LIFO order. When set to 0, FIFO order will be utilized.
Only a value of 0 is supported. This field is non-changeable.
REW: A Report Early-Warning bit of 1 indicates the target shall return Check
Condition status with the EOM bit set to 1 when the logical early-warning position is
encountered during Read and Write operations. A REW bit of 0 indicates the target
shall not report this condition for read operations (but it shall report the early warning
for write operations). The default value is 0b. This field is not changeable.
NOTE: Early Warning is reported only on WRITE commands.
Gap Size field value determines the size of the inter-block gap while writing data and
must be set to 0. This field is non-changeable.
End-of-Data (EOD) Defined: This field indicates which format type the logical unit
shall use to detect and generate the EOD area. The only type supported is 000b,
indicating a device default EOD definition per QIC format standard. Values 001b to
111b are reserved. This field is non-changeable.