IBM DTTA-351010 Hard Drive Specifications - Page 159

Individual Attribute Data Structure

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12.31.2.2 Individual Attribute Data Structure The following defines the 12 bytes that make up the information for each Attribute entry in the Device Attribute Data Structure. Description Bytes Offset Format Attribute ID Number (01h to FFh) 1 00h binary Status Flags 2 01h bit flags Pre Failure/Advisory bit On line Collection bit Vendor Specific (4 bits) Reserved (10 bits, all 0) Attribute Value (valid values from 01h to FEh) 1 03h binary 00h invalid for attribute value not to be used 01h minimum value 64h initial value for all attributes prior to any data collection FDh maximum value FEh value is not valid FFh invalid for attribute value not to be used Vendor Specific 8 04h binary Total Bytes 12 Figure 115. Individual Attribute Data Structure 12.31.2.2.1 Attribute ID Numbers: Any non-zero value in the Attribute ID Number indicates an active attribute. The device supports following Attribute ID Numbers. Those marked with (*) indicate that corresponding Attribute Values can be collected only during off-line test. ID Attribute Name 0 Indicates that this entry in the data structure is not used 1 Raw Read Error Rate 2 Throughput Performance (*) 3 Spin Up Time 4 Start/Stop Count 5 Reallocated Sector Count 7 Seek Error Rate Command Descriptions 151

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12.31.2.2
Individual Attribute Data Structure
The following defines the 12 bytes that make up the information for each Attribute entry in the Device Attri-
bute Data Structure.
Description
Bytes Offset
Format
Attribute ID Number (01h to FFh)
1
00h
binary
Status Flags
2
01h
bit flags
Pre Failure/Advisory bit
On line Collection bit
Vendor Specific (4 bits)
Reserved (10 bits, all 0)
Attribute Value (valid values from 01h to FEh)
1
03h
binary
00h invalid for attribute value
not to be used
01h minimum value
64h initial value for all attributes prior to
any data collection
FDh maximum value
FEh value is not valid
FFh invalid for attribute value
not to be used
Vendor Specific
8
04h
binary
Total Bytes
12
Figure 115. Individual Attribute Data Structure
12.31.2.2.1
Attribute ID Numbers:
Any non-zero value in the Attribute ID Number indicates an active
attribute.
The device supports following Attribute ID Numbers.
Those marked with (*) indicate that corre-
sponding Attribute Values can be collected only during off-line test.
ID
Attribute Name
0
Indicates that this entry in the data structure is not used
1
Raw Read Error Rate
2
Throughput Performance (*)
3
Spin Up Time
4
Start/Stop Count
5
Reallocated Sector Count
7
Seek Error Rate
Command Descriptions
151