Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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these data structures are in 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 152: Device Attribute Thresholds Data Structure
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.
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.
Description Byte Offset Value
Data Structure Revision Number 2 00h 0010h
1st Device Attribute 12 02h
... .
30th Device Attribute 12 15Eh
Reserved 18 16Ah 00h
Vendor specific 131 17Ch 00h
Data structure checksum 1 1FFh
512
Table 153: Individual Threshold Data Structure
Description Byte Offset
Attribute ID Number (01h to FFh) 1 00h
Attribute Threshold 1 01h
Reserved (00h) 10 02h
Total Bytes 12
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