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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-109

MODE SENSE may be either MODE SENSE (6) or MODE SENSE (10). MODE SENSE (6) data

contains a 4-byte header, followed by one 8-byte block descriptor, followed by zero or more

variable-length pages, depending on the Page Code and Allocation Length.

4.10.1 MODE SENSE Data Headers

The MODE SENSE (6) and MODE SENSE (10) headers are depicted in the following figures.

Figure 4-60. MODE SENSE (6) Data Header — Data Format

Page Code Allows the host to select a specific page or all of the pages the drive

supports.

SubPage Code Specifies the subpage to return. Set to FFh to return all subpages.

Allocation Length Specifies the number of bytes that the host has allocated for returned

MODE SENSE data. An Allocation Length of 0 indicates that the drive

returns no MODE SENSE data. This is not considered an error and the

drive returns GOOD status.

Bit

Byte

7 6 5 4 3 2 1 0

0 Mode Sense Data Length

1 Medium Type

2 WP Buffered Mode Speed (0)

3 Block Descriptor Length

Table 4-60. MODE SENSE Command Descriptor Block — Field Descriptions (Continued)

Field Name Description

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 293 294

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