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Hitachi hard disk drive specifications
155
11.18.6 Write Stream Error log
Table 111 defines the format of the Write Stream Error log. Entries are placed into the Write Stream Error log
only when the SE bit is set to one in the Status Register. The 512 bytes returned shall contain a maximum of
31 error entries. The Write Stream Error Count shall contain the total number of Write Stream Errors detected
since the last 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.
only when the SE bit is set to one in the Status Register. The 512 bytes returned shall contain a maximum of
31 error entries. The Write Stream Error Count shall contain the total number of Write Stream Errors detected
since the last 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.
Description
Bytes
Offset
Structure Version
1
00h
Error Log Index
1
01h
Write Stream Error Log Count
2
02h
Reserved
12
04h
Write Stream Error Log Entry #1
16
10h
Write Stream Error Log Entry #2
16
20h
...
Write Stream Error Log Entry #31
16
1F0h
512
Table 111 Write Stream Error Log
The Data Structure Version field shall contain a value of 02h indicating the second revision of the structure
format.
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.
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.
(31:0) are valid.
Table 109 defines the format of each entry in the Error Log.