Travelstar 5K160 (PATA) Hard Disk Drive Specification
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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 Bytes
Offset
Format
Value
Data Structure Revision Number
2
00h
binary
0010h
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 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 Bytes
Offset
Format
Attribute ID Number (01h to FFh)
1
00h
binary
Attribute Threshold (for comparison with Attribute Values
from 00h to FFh)
1
01h binary
00h -
"always passing" threshold value to be
used for code test purposes
01h -
minimum value for normal operation
FDh -
maximum value for normal operation
FEh -
invalid for threshold value
FFh -
"always failing" threshold value to be used
for code test purposes
Reserved (00h)
10
02h
binary
Total Bytes
12
Figure 110 Individual Threshold Data Structure