Freecom FC TapeWare AIT-450i, Руководство пользователя

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MODE SELSECT 6.Command Specification
SONY AIT-1 Turbo drive SDX-450V series Ver.1.0 6-41
6.7.3. Device Configuration Page (10h)
The drive supports the Device Configuration Page which has the following format:
Table 6-37: 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 Active Format
3 Active Partition
4 Write Buffer Full Ratio (00h)
5 Read Buffer Empty Ratio (00h)
6 (MSB) Write Delay Time
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
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:
Table 6-38: Active Format
4 3 2 1 0
Disable RAW 3rd ECC Reserved(0)
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 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 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.