Sony SDX-800V/R manual Supported Mode Sense Page Codes, Length 08h, Number of Blocks 00 00 00h

MODE SENSE			6.Command Specification
	Table 6-52: Supported MODE SENSE Page Codes
	Page Code	Description
	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

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.

Table 6-53: MODE SENSE data

Bit	7	6		5		4		3	2	1	0
Byte
0						Mode Data Length
1						Medium Type (00h)
2	WP		Buffered Mode (001b)						Speed (00h)
3					Block Descriptor			Length (08h)
5	(MSB)				Number of Blocks (00 00 00h)
6
7											(LSB)
8							Reserved
9	(MSB)					Block Length
10
11											(LSB)

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-3Ex drive SDX-800V series Ver.1.1 6-57