Hitachi HDS728080PLAT20 Specifications - Page 163
Streaming Performance Log
UPC - 829686000094
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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 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 7K80 Hard Disk Drive Specification 159