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11.33.2.11 Data Structure Checksum
The Data Structure Checksum is the two's compliment of the result of a simple 8-bit addition of the first
511 bytes in the data structure.
11.33.3 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 SMART Read Attribute Thresholds. All multibyte fields
shown in these data structures are in byte ordering, that is, 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.
Description
Data Structure Revision Number
1st Device Attribute
...
...
30th Device Attribute
Reserved
Vendor specific
Data structure checksum
Figure 144. Device Attribute Thresholds Data Structure
11.33.3.1 Data Structure revision number
This value is the same as the value used in the Device Attributes Values Data Structure.
11.33.3.2
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 is in the
same order and correspond to the entries in the Individual Attribute Data Structure.
Description
Attribute ID Number (01h to FFh)
Attribute Threshold
Reserved (00h)
Total bytes
Figure 145. Individual Threshold Data Structure
11.33.3.3 Attribute ID numbers
Attribute I D Numbers supported by the device are the same as Attribute Values Data Structures.
Byte
131
512
Deskstar 120GXP hard disk drive specifications
172
Offset
Value
2
00h
0010h
12
02h
..
..
12
15Eh
18
16Ah
00h
17Ch
00h
1
1FFh
Byte
Offset
1
00h
1
01h
10
02h
12
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