Hitachi IC25N040ATMR04-0 Specifications - Page 181
Device Attribute Thresholds data structure
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13.38.3 Device Attribute Thresholds data structure The following defines the 512 bytes that make up the Attribute Threshold information. This data structure is accessed by the host in its entirety using the S.M.A.R.T. Read Attribute Thresholds. All multibyte fields shown in these data structures follow the ATA-3 specification for byte ordering, that is, that the least significant byte occupies the lowest numbered byte address location in the field. The sequence of active Attribute Thresholds will appear in the same order as their corresponding Attribute Values. Table 115: Device Attribute Thresholds Data Structure Description Data Structure Revision Number 1st Device Attribute ... ... 30th Device Attribute Reserved Vendor specific Data structure checksum Byte 2 12 .. .. 12 18 131 1 512 Offset 00h 02h Format binary (*1) Value 0010h (*2) 15Eh 16Ah 17Ch 1FFh (*1) (*2) (*3) (*3) (*2) (*1) - See the following definitions (*2) - Value varies by actual operating condition (*3) - Filled with 00h 13.38.3.1 Data Structure Revision Number This value is the same as the value used in the Device Attributes Values Data Structure. 13.38.3.2 Individual Thresholds Data Structure The following defines the 12 bytes that make up the information for each Threshold entry in the Device Attribute Thresholds Data Structure. Attribute entries in the Individual Threshold Data Structure are in the same order and correspond to the entries in the Individual Attribute Data Structure. Table 116: Individual Threshold Data Structure Description Attribute ID Number (01h to FFh) Attribute Threshold (for comparison with Attribute Values from 00h to FFh) 00h - "always passing" threshold value to be used for code test purposes 01h - minimum value for normal operation FDh - maximum value for normal operation FEh - invalid for threshold value FFh - "always failing" threshold value to be used for code test purposes Reserved (00h) Total Bytes Byte 1 1 10 12 Offset 00h 01h Format binary binary 02h binary Travelstar 80GN Hard Disk Drive Specification 171