Hitachi HDT725025VLA380 Specifications - Page 248
Individual Thresholds Data Structure
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The sequence of active Attribute Thresholds will appear in the same order as their corresponding Attribute Values. Table 142: 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 15Eh 16Ah 17Ch 1FFh Value 0010h 00h 00h 12.42.3.1 Data Structure Revision Number This value is the same as the value used in the Device Attributes Values Data Structure. 12.42.3.2 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 143: Individual Threshold Data Structure Description Attribute ID Number (01h to FFh) Attribute Threshold Reserved (00h) Total Bytes Byte 1 1 10 12 Offset 00h 01h 02h 12.42.3.3 Attribute ID Numbers Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures. 12.42.3.4 Attribute Threshold These values are preset at the factory and are not meant to be changeable. 12.42.3.5 Data Structure Checksum The Data Structure Checksum is the two's complement of the result of a simple 8-bit addition of the first 511 bytes in the data structure. Deskstar T7K500 Hard Disk Drive Specification 234