Hitachi HDT725025VLA380 Specifications - Page 190
Streaming Performance Log
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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 103: 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 Bytes 1 1 2 12 16 16 16 512 Offset 00h 01h 02h 04h 10h 20h 1F0h 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 T7K500 Hard Disk Drive Specification 176