Sony AIT-SDX460, Руководство по техническим характеристикам продукции

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7. ATAPI Packet Command Specification MODE SENSE
SONY AIT-1Turbo drive SDX-460V series Ver.1.0 7-36
A CHECK CONDITION will occur on the transition from uncompressed to compressed if RED = 10b.
For the MODE SENSE command, the decompression algorithm field reflects either the algorithm selected by the
initiator or compression algorithm which was used to process the data most recently encountered on the medium,
during a read operation.
A value of ZERO shall indicate that the data encountered on the medium during the most recent read operation
was uncompressed.
7.8.3. Device Configuration Page 10h
The drive supports the Device Configuration Page which has the following format:
Table 7-38: MODE PAGE Device Configuration (10h)
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 Active Format
3 Active Partition
4 Write Buffer Full Ratio (00h)
5 Read Buffer Empty Ratio (00h)
6 (MSB)
7
Write Delay Time
(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)
12
13
Buffer Size at Early Warning (00 00 00h)
(LSB)
14 Select Data Compression Algorithm
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 Format: This field is used to enable AIT format options and is described below:
4 3 2 1 0
Disable RAW 3
rd
ECC Reserved
Disable RAW: This bit is used to enable or disable the use of Read-After-Write error detection. If this bit is NOT
set, RAW is enabled. This is the drive’s default configuration.
3rd ECC: This bit is used to enable or disable the use of Third Level Error Correction. If this bit is set, 3rd ECC is
enabled. This is the drive’s default configuration.
Active Partition: Indicates the current partition number in use on the medium.
Setting this field to a non-existing partition 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
Host.