Hitachi IC25N040ATCS04-0 Specifications - Page 189

Individual Thresholds Data Structure, 32.3.3 Attribute ID Numbers, 32.3.4 Attribute Threshold

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13.32.3.2 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 are 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 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) Total Bytes Byte 1 1 Offset 00h 01h Format binary binary 10 02h binary 12 Figure 127. Individual Threshold Data Structure 13.32.3.3 Attribute ID Numbers Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures. 13.32.3.4 Attribute Threshold These values are preset at the factory and are not meant to be changeable. However, the host might use the "S.M.A.R.T. Write Attribute Threshold" subcommand to override these preset values in the Threshold sectors. 13.32.3.5 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. Hitachi Travelstar 60GH & 40GN hard disk drive specifications 176

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13.32.3.2 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 are in the
same order and correspond to the entries in the Individual Attribute Data Structure.
12
Total Bytes
binary
02h
10
Reserved (00h)
FFh
–
"always failing" threshold value to
be used for code test purposes
FEh
–
invalid for threshold value
FDh
–
maximum value for normal operation
01h
–
minimum value for normal operation
00h
–
"always passing" threshold value to
be used for code test purposes
binary
01h
1
Attribute Threshold (for comparison with
Attribute Values from 00h to FFh)
binary
00h
1
Attribute ID Number (01h to FFh)
Format
Offset
Byte
Description
Figure 127. Individual Threshold Data Structure
13.32.3.3 Attribute ID Numbers
Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures.
13.32.3.4 Attribute Threshold
These values are preset at the factory and are not meant to be changeable. However, the host might use
the "S.M.A.R.T. Write Attribute Threshold" subcommand to override these preset values in the Threshold
sectors.
13.32.3.5 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.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
176