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MODE SENSE
If the Host selects any other values, the drive will terminate the command with a CHECK CONDITION status and an
ILLEGAL REQUEST sense key set.
Note: If the Page Code is ZERO, the drive will only return the four-byte header and the one eight-byte block
descriptor and terminate the command with GOOD status.
Allocation Length: The Allocation Length specifies the number of bytes that the HOST has allocated for returned
MODE SENSE data. An Allocation Length of ZERO means that the drive will return no MODE SENSE data. This is
not considered an error and GOOD status will be returned. Any other value indicates the maximum number of bytes
that can be transferred. The drive terminates the DATA IN phase when the Allocation Length bytes have been
transferred or when all available MODE SENSE data has been transferred to the initiator, whichever is less. The
Allocation Length must fall on header or block descriptor boundaries. If the Allocation Length does not fall on these
boundaries then the drive returns CHECK CONDITION status with the ILLEGAL REQUEST sense key set, unless
the value is greater than that required for the specified page.
If the Page Code is ZERO, the Host requires MODE SENSE to only return the four-byte header the one eight-byte
block descriptor, therefore the Allocation Length must be set to 0Ch. The value of the Page Control Field is then not
checked by the drive and may be set to any value.
If the Allocation Length is non ZERO, it must be set to 4 or more. If the Allocation length is non ZERO and less than
4, the drive will return CHECK CONDITION status, and ILLEGAL REQUEST sense key.
The MODE SENSE data contains a four-byte header, followed by one eight-byte block descriptor, followed by ZERO
or more variable length pages, depending on the Page Code and the Allocation Length.
Bit
7
Byte
0
1
2
WP
3
4
5
(MSB)
6
7
8
9
(MSB)
10
11
Mode Data Length: The mode data length specifies the length in bytes of the following mode sense data that is
available to be transferred during the DATA IN phase. The mode data length does not include itself but does include
the total length of all requested MODE SENSE pages.
SONY AIT-4 drive SDX-900V series Ver.2.1
Table 6-52: Supported MODE SENSE Page Codes
Page Code
00h
Standard Sense
02h
Disconnect-Reconnect
0Ah
Control Mode Page
0Fh
Data Compression Control
10h
Device Configuration
11h
Medium Partitions Parameter
1Ch
Informational Exception Control
31h
AIT Device Configuration
32h
Append Partition (Not Support)
33h
Delete Partition (Not Support)
3Fh
Return All Pages
Table 6-53: MODE SENSE data
6
5
4
Mode Data Length
Medium Type (00h)
Buffered Mode (001b)
Block Descriptor Length (08h)
Density Code (33h)
Number of Blocks (00 00 00h)
Block Length
Description
3
2
Speed (00h)
Reserved
6.Command Specification
1
0
(LSB)
(LSB)
6-57
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