Streaming Performance Log; Table 107.Write Stream Error Log - Hitachi 7K80 - Deskstar - Hard Drive Specifications

successful completion of the Read Log Ext command with LBA Low register set to 21h. This error count may be
greater than 31, but only the most 31 errors are represented by entries in the log. If the Write Stream Error Count
reaches the maximum value that can be represented after the next error is detected the Write Stream Error Count
shall remain at the maximum value. After successful completion of a Read Log Ext command with the LBA Low
Register set to 21h, the Write Stream Error Log shall be reset to a power-on or hardware reset condition, with the
Error Log Index and Write Stream Error Count cleared to zero. The Write Stream Error Log is not reserved across
power cycles and hardware reset.
Table 108: Write Stream Error Log
Description
Structure Version
Error Log Index
Write Stream Error Log Count
Reserved
Write Stream Error Log Entry #1
Write Stream Error Log Entry #2
...
Write Stream Error Log Entry #31
The Data Structure Version field shall contain a value of 02h indicating the second revision of the structure format.
The Write Stream Error Log Count field shall contain the number of Write Stream command entries since the last
power on, since this log was last read, or since hardware reset was executed.
The Error Log Index indicates the error log data structure representing the most recent error. Only values (31:0)
are valid.

12.17.6 Streaming Performance Log

Figure 112 defines the format of the log returned by the Read Log Ext command, when the LBA Low register is
20h. This data set is referred to as the Streaming Performance Parameters log, the length of which (in sectors) is
statically indicated in Read Log Ext log address 00h (Log Directory).
Deskstar 7K80 Hard Disk Drive Specification
159
Bytes Offset
1
1
2
12
16
16
16 1F0h
512
00h
01h
02h
04h
10h
20h