User's Guide

Commands: Log Sense (4Dh) Page 61
The following subsections describe the log sense pages.
List of Available Pages (Page 0)
Page 0 indicates the log sense pages used by the drive. To determine the size of
each page and of each parameter in the page, the individual pages must be
requested.
Page 0 is unique in that the parameter data returned does not contain log parameter
headers. All other pages return a page header followed by zero or more variable-
length log parameters.
Page 0 is valid only for the LOG SENSE command. When page 0 is requested, the
four-byte page header is returned followed by the page codes used—one byte for
each. the available page codes are returned in ascending order. The following table
shows the page 0 data format.
Byte HEX Code Description
0 00 Header, page 0
1 00 Header, reserved
2 00 Header, page length MSB
3 09 Header, page length LSB
4 00 Page 0
5 02 Page 2
6 03 Page 3
7 2E Page 2E
8 30 Page 30
9 31 Page 31
10 39 Page 39
11 3A Page 3A
12 3C Page 3C
Page Code Data Format for Pages
The parameter data returned consists of a four-byte page header followed by zero
or more log parameters as shown in the following illustration.
Page Header
First Log Parameter
.
.
.
Last Log Parameter
A log parameter is made up of
• A two-byte parameter code followed by
• A Parameter Control byte
• A Parameter Length byte
• One or more parameter bytes
Parameter Code Field
The following table presents the Parameter Code Field format.