IBM IC25N020ATDA04 Hard Drive Specifications - Page 194

Individual Thresholds Data Structure, 33.3.3 Attribute ID Numbers, 33.3.4 Attribute Threshold

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13.33.3.2 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 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 10 12 Offset Format 00h binary 01h binary 02h binary Figure 122. Individual Threshold Data Structure 13.33.3.3 Attribute ID Numbers Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures. 13.33.3.4 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. 13.33.3.5 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. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 180

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13.33.3.2 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 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 122. Individual Threshold Data Structure
13.33.3.3 Attribute ID Numbers
Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures.
13.33.3.4 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.
13.33.3.5 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.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
180