Figure 109 Device Attribute Thresholds Data Structure; Figure 110 Individual Threshold Data Structure - Hitachi HTS541616J9AT00 - Travelstar 160 GB Hard Drive Specifications

2.5 inch ata/ide hard disk drive
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14.39.2.12
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.
14.39.3 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 S.M.A.R.T. Read Attribute Thresholds. All multi-byte fields shown in
these data structures follow the ATA/ATAPI-7 specification 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
(*1) - See following definitions
(*2) - Value varied by actual operating condition
(*3) - Filled with 00h

Figure 109 Device Attribute Thresholds Data Structure

14.39.3.1 Data Structure Revision Number
This value is the same as the value used in the Device Attributes Values Data Structure.
14.39.3.2 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 (for comparison with Attribute Values
from 00h to FFh)
00h -
"always passing" threshold value to be
used for code test purposes
minimum value for normal operation
01h -
maximum value for normal operation
FDh -
invalid for threshold value
FEh -
"always failing" threshold value to be used
FFh -
for code test purposes
Reserved (00h)
Total Bytes

Figure 110 Individual Threshold Data Structure

Travelstar 5K160 (PATA) Hard Disk Drive Specification
160 / 188
Bytes
Offset
2
00h
12
02h
..
..
12
15Eh
18
16Ah
131
17Ch
1
1FFh
512
Bytes
Offset
1
1
10
12
Format
Value
binary
0010h
(*1)
(*2)
(*1)
(*2)
(*3)
(*3)
(*2)
Format
00h
binary
01h
binary
02h
binary

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