MODE SELECT
6.Command Specification
SONY AIT-5 drive SDX-1100V series Ver.1.0
6-47
6.7.4.
Device Configuration Page (10h)
The drive supports the Device Configuration Page which has the following format:
Table 6-46: Device Configuration Page
Bit
Byte
7 6 5 4 3 2 1 0
0
PS (0)
Reserved
Page Code (10h)
1
Page Length (0Eh)
2
Reserved
CAP CAF
(0)
Reserved
3
Active Partition
4
Write Buffer Full Ratio (00h)
5
Read Buffer Empty Ratio (00h)
6
(MSB)
Write Delay Time (0064h)
7
(LSB)
8
DBR (0)
BIS (1)
RSmk
AVC (0)
SOCF (00b)
RBO (0)
REW
9
Gap Size (00h)
10
EOD Defined (000b)
EEG (1)
SEW Reserved
11
(MSB)
Buffer Size at Early Warning (00 00 00h)
12
13
(LSB)
14
Select Data Compression Algorithm (00h)
15
Reserved
CAP:
The Change Active Partition bit, when set to one, indicates that the partition is changed to the one specified
by the Active Partition Field. This is a feature supported by the drive and is discussed below.
CAF:
The Change Active Format bit, set to one, indicates that the active format is to be changed to that set in the
Active Format Field.
Active Partition:
Indicates the current partition number in use on the medium.
Setting this field to a non-existing partition number will be rejected by the drive with a CHECK CONDITION status
and the ILLEGAL REQUEST 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
initiator.
Write Delay Time:
This field indicates the maximum time, in 100 millisecond increments, that the drive will 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. This field is non changeable.
DBR:
This field is not supported and will be always set to ZERO.
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 capabilities.
These bits are ignored by the drive on a MODE SELECT command. The drive will not return a CHECK
CONDITION.
RSmk:
The Report Setmark bit, when set to one, indicates that Setmarks will be reported to the drive. When
ZERO, Setmarks are NOT reported. The default is one, Setmarks 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.
