Table 156. Device Attribute Thresholds Data Structure; Table 157. Individual Threshold Data Structure - Hitachi 7K400 - Deskstar Hard Drive Specifications

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 157: Device Attribute Thresholds Data Structure
Description
Data Structure Revision Number
1st Device Attribute
...
30th Device Attribute
Reserved
Vendor specific
Data structure checksum
12.46.3.1 Data Structure Revision Number
This value is the same as the value used in the Device Attributes Values Data Structure.
12.46.3.2 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 158: Individual Threshold Data Structure
Description
Attribute ID Number (01h to FFh)
Attribute Threshold
Reserved (00h)
Total Bytes
12.46.3.3 Attribute ID Numbers
Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures.
12.46.3.4 Attribute Threshold
These values are preset at the factory and are not meant to be changeable.
12.46.3.5 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.
Byte Offset
2 00h
12 02h
.
12 15Eh
18 16Ah
131 17Ch
1 1FFh
512
1
1
10
12
Deskstar 7K400 Hard Disk Drive Specification
215
Value
0010h
00h
00h
Byte Offset
00h
01h
02h