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SONY SDT-10000/SDT-11000 DDS Tape Drive
6. COMMAND SPECIFICATION
The drive will default to Partition 0 if the drive has been power-cycled, has received a BUS DEVICE RESET
message, a Hard RESET or a tape is loaded. This is irrespective of whether the tape has been partitioned or not.
If the media is to be used in the two partition format, the media must first be initialized using MODE SELECT
Medium Partitions Parameter Page.
If the currently loaded tape has not been formatted to be a two partition tape and the Host requests the Active
Partition to be changed via the CAP and Active Partition fields, then the drive will return a CHECK CONDITION
status with a MEDIUM ERROR sense key set.
Write Buffer Full Ratio and Read Buffer Empty Ratio:
These fields are not supported by the drive. Setting these fields to anything other than zero will cause the drive to
return a CHECK CONDITION status and an ILLEGAL REQUEST sense key.
The drive implements an algorithm which automatically adjusts these ratios so as to maximize streaming to the
Host.
Write Delay Time:
This field indicates the maximum time, in 100 millisecond increments, that the drive shall wait with a partially full
buffer before forcing the data to tape. The drive defaults to a 10 second delay since the last SCSI bus activity before
the data is flushed from the buffer to the tape. If Write Delay Time is set to zero the drive will wait indefinitely for
the data group to be filled.
DBR: This field is not supported and should be always set to 0.
BIS: Block Identifiers Supported is set to one to indicate that the media has recorded information about the logical
block ID relative to the partition.
The DBR and BIS bit are only valid on a MODE SENSE command where they are used to report drive capabili-
ties. These bits are ignored by the drive on a MODE SELECT command. The drive will not return a CHECK
CONDITION.
RSmk:
The Report Set Mark bit, when set to one, indicates that Save Set Marks will be reported to the drive. When zero,
Save Set Marks are NOT reported. The default is one, Save Set Marks reported.
AVC:
Automatic Velocity Control function is not supported by the drive and if this bit is set a CHECK CONDITION
status is returned with an ILLEGAL REQUEST sense key.
SOCF:
Stop on Consecutive Filemarks function is not supported by the drive and if this bit is set a CHECK CONDITION
status is returned with an ILLEGAL REQUEST sense key.
RBO:
This field is not supported. If this bit is set a CHECK CONDITION status is returned with an ILLEGAL REQUEST
sense key.
REW:
The drive returns Report Early-Warning End-of-Media bit not set. This indicates that the drive will not report the
early-warning condition on reads but will report early-warning on writes at a distance of 1500 mm (:DDS2/3 , 500
mm: DDS-1) before the physical End-Of-Partition
Gap Size:
This field is not used by the DDS format and shall be set to zero otherwise a CHECK CONDITION with an
ILLEGAL REQUEST sense key will be returned.
EOD Defined:
This field shall always be set to zero so that the drive will use its default EOD definition to detect and generate EOD.
Any other value will cause the drive to return a CHECK CONDITION status with an ILLEGAL REQUEST sense
key set.
MODE SELECT
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