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12.21.3 Device Statistics log (log page 04h)
The Device Statistics log contains selected statistics about the device.
The number of log pages may be greater than one.
See Table 128 for a list of defined log pages. Each supported log page consists of a header field that may be followed
by defined statistics fields. If the Revision Number field in the log page header is 0000h, then that log page is not
supported. All log page data following the last defined statistic for that log page is reserved.
If an unsupported log page is requested, then 512 bytes of all zeros are returned for that log page.
Table 128 Defined Device Statistics log pages
Description
Log page
List of supported log pages (See Table 129)
00h
General Statistics (See Table 130)
01h
Free Fall Statistics (Not Supported)
02h
Rotating Media Statistics (See Table 131)
03h
General Errors Statistics (See Table 132)
04h
Temperature Statistics (See Table 133 & Table 134)
05h
Transport Statistics (See Table 135)
06h
Solid State Device Statistics (Not Support)
07h
Reserved
08h..FFh
12.21.3.1
List of Supported Device Statistics log pages (log page
00h)
The List of Supported Device Statistics log pages contains a list of the supported device statistics log pages as
described in Table 129. Entries are in order of ascending log page number. Every log page for which there is at least
one supported statistic is listed.
Table 129 List of supported Device Statistics log pages
Description
Bytes
Offset
Device Statistics Information Header. This device statistics log page
lists the number of the supported device statistics log pages.
8
00h
Bit
Description
63:24
Reserved
23:16
Log page number. (00h)
15:0
Revision number. (0001h)
Number of entries (n) in the following list
1
08h
Log page number of first supported device statistics log page (00h)
1
09h
Log page number of second supported device statistics log page
1
0Ah
…
Log page number of nth supported device statistics log page
1
n+08h
Reserved
n+09h..1FFh
198
Hard Disk Drive Specification