Hitachi P7K500 Specifications - Page 175

10.19.6 Write Stream Error log Table 123 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. 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 124 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 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. 0 defines the format of each entry in the Error Log. HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1) 167