Log Directory; Table 104: S.m.a.r.t. Log Director; Table 105: Individual Threshold Data Structure - Hitachi HTS541010G9AT00 - Travelstar 100 GB Hard Drive Specifications

12.38.4 S.M.A.R.T Log Directory
Table 121 defines the 512 bytes that make up the S.M.A.R.T Log Directory. The S.M.A.R.T Log Directory is on
S.M.A.R.T Log Address zero and is defined as one sector long.

Table 104: S.M.A.R.T. Log Director

Description
S.M.A.R.T. Logging Version
Number of sectors in the log at log address 1
Reserved
Number of sectors in the log at log address 2
Reserved
...
Number of sectors in the log at log address 255
12.38.4.1 Data Structure Revision Number
This value is the same as the value used in the Device Attributes Values Data Structure.
12.38.4.2 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.

Table 105: Individual Threshold 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
12.38.4.3 Attribute ID Numbers
Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures.
12.38.4.4 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.
Bytes
2
1
1
1
1
...
1
512
Travelstar 5K100 (Serial ATA) Hard Disk Drive Specification
157
Offset
01h
02h
03H
04H
05h
...
1FEh
Byte Offset
1 00h
1 01h
10 02h
12
Format
binary
binary
binary