IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 186

Device Attribute Thresholds Data Structure

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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 Byte 2 12 .. .. 12 18 131 1 512 Offset 00h 02h Value 0010h 15Eh 16Ah 00h 17Ch 00h 1FFh 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 Byte 1 1 10 12 Offset 00h 01h 02h 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. Deskstar 120GXP hard disk drive specifications 172

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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.
512
1FFh
1
Data structure checksum
00h
17Ch
131
Vendor specific
00h
16Ah
18
Reserved
15Eh
12
30th Device Attribute
..
...
..
...
02h
12
1st Device Attribute
0010h
00h
2
Data Structure Revision Number
Value
Offset
Byte
Description
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.
12
Total bytes
02h
10
Reserved (00h)
01h
1
Attribute Threshold
00h
1
Attribute ID Number (01h to FFh)
Offset
Byte
Description
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.
Deskstar 120GXP hard disk drive specifications
172