IBM DTCA-24090 Hard Drive Specifications - Page 163

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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 Figure 99. Individual Threshold Data Structure Bytes Offset Format 1 00h binary 1 01h binary 10 02h binary 12 12.30.3.3 Attribute ID Numbers Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures. 12.30.3.4 Attribute Threshold These values are preset at the factory and are not meant to be changeable. However, the host might use "SMART Write Attribute Threshold" subcommand to override these preset values in the Threshold sectors. 12.30.3.5 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. 12.30.4 Error Reporting The following table shows the values returned in the Status and Error Registers when specific error conditions are encountered by a device. Command Descriptions 155

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Description
Bytes Offset
Format
Attribute ID Number (01h to FFh)
1
00h
binary
Attribute Threshold (for comparison with
1
01h
binary
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)
10
02h
binary
Total Bytes
12
Figure 99. Individual Threshold Data Structure
12.30.3.3
Attribute ID Numbers
Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures.
12.30.3.4
Attribute Threshold
These values are preset at the factory and are not meant to be changeable. However, the host might use
“SMART Write Attribute Threshold” subcommand to override these preset values in the Threshold sectors.
12.30.3.5
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.
12.30.4
Error Reporting
The following table shows the values returned in the Status and Error Registers when specific error condi-
tions are encountered by a device.
Command Descriptions
155