Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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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 112: Write Stream Error Log
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 a 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.
Table 113 defines the format of each entry in the Error Log
12.17.6 Streaming Performance log
Table 114 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).
The host should base its calculations on the larger of its Typical Host Interface Sector Time and the device reported
Sector Time values, and on the sum of the device reported Access Time values and any additional latency that only
the host is aware of (e.g. host command overhead, etc.).
Table 113: Streaming Performance Parameters log
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
Description Bytes
Stream Performance Parameters log version 2
K, Number of Regions in Sector Time Array 2
L, Number of Positions in Position Array 2
M, Number of Position-differences in Access T
ime
Array
2
Sector Time Array K*8
Position Array L*8
Access Time Array M*4
Reserved
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