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MODE SENSE
Number of Blocks: The Number of Blocks field is ZERO, indicating that an unspecified (or unknown) number of the
remaining logical blocks on the tape may have the media characteristics specified by the Block Descriptor.
Block Length: The Block Length field specifies the length in bytes of each logical block transferred over the SCSI
bus. A Block Length of ZERO indicates that the length is variable. Any other value indicates the number of bytes per
block that the drive must handshake over the bus. This establishes Block Length such that the Transfer Length for
read, write and verify type commands will be a block count not a byte count. Minimum Block Length is 2. If Block
Length is 1, Check Condition Status will be return ,Sense Key will be ILLEGAL REQUEST.
Note: It is value of this field together with the Fixed Bit Field in the READ, or WRITE commands that determines
whether the drive is in Fixed or Variable block mode.
Page Descriptor: The supported pages are fully documented in the MODE SELECT clause of this Chapter.
PS: When the Page Savable bit is set, this indicates that the page contains saved parameters. This bit will never be
set as there is no non-volatile RAM on the drive into which parameter data may be saved.
All fields not supported by the drive must be set to ZEROs.
6.8.1. Mode Sense 31h (AIT Device Configuration Page)
Note 1: SDX-550V always reports the status of the cassette present in the drive, even if the mode values are
changed.
Note 2: AIT-bit and DEV-bit values are changed after completing the Mode Select Page 11h.
Note 3: SDX-550V reports the following status for a virgin cassette:
Bits
SDX-T3N
AIT
0
DEV
0
ULPBOT
1
PRTH
0
PONEJ
0
ABS
0
MIC
0
SysLogAlive
00B
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
MIC Cartridge
0
0
1
0
0
1
1
11B
6.Command Specification
6-59
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