IBM DTTA-351010 Hard Drive Specifications - Page 162

Device Attribute Thresholds Data Structure

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12.31.2.9 Data Structure Checksum The Data Structure Checksum is the 2's compliment of the result of a simple 8-bit addition of the first 511 bytes in the data structure. 12.31.3 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 multi-byte fields shown in these data structures follow the ATA/ATAPI-4 specifications for byte ordering, namely 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. Description Data Structure Revision Number 1st Attribute Threshold ... ... 30th Attribute Threshold Reserved Vendor specific Data structure checksum Bytes Offset Format 2 00h binary 12 02h (*1) .. .. 12 15Eh (*1) 18 16Ah 131 17Ch 1 1FFh 512 Value 0005h (*2) (*2) (*3) (*3) (*2) (*1) See following definitions (*2) Value varied by actual operating condition (*3) Filled with 00h Figure 117. Device Attribute Thresholds Data Structure 12.31.3.1 Data Structure Revision Number This value (0005h) is the same as the value used in the Device Attributes Values Data Structure. 12.31.3.2 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. 154 OEM Specifications for DTTA-3xxxxx

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12.31.2.9
Data Structure Checksum
The Data Structure Checksum is the 2's compliment of the result of a simple 8-bit addition of the first 511
bytes in the data structure.
12.31.3
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 multi-byte fields
shown in these data structures follow the ATA/ATAPI-4 specifications for byte ordering, namely 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.
Description
Bytes Offset
Format
Value
Data Structure Revision Number
2
00h
binary
0005h
1st Attribute Threshold
12
02h
(*1)
(*2)
...
..
...
..
30th Attribute Threshold
12
15Eh
(*1)
(*2)
Reserved
18
16Ah
(*3)
Vendor specific
131
17Ch
(*3)
Data structure checksum
1
1FFh
(*2)
512
(*1)
See following definitions
(*2)
Value varied by actual operating condition
(*3)
Filled with 00h
Figure 117. Device Attribute Thresholds Data Structure
12.31.3.1
Data Structure Revision Number
This value (0005h) is the same as the value used in the Device Attributes Values Data Structure.
12.31.3.2
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.
154
OEM Specifications for DTTA-3xxxxx