Device Attribute Thresholds Data Structure; Table 117. Device Attribute Thresholds Data Structure; Table 118. Individual Threshold Data Structure; Vendor Specific - Hitachi 7K100 - Travelstar - Hard Drive Specifications

13.39.3 Device Attribute Thresholds data structure

The following defines the 512 bytes that make up the Attribute Threshold information. This data structure is
accessed by the host in its entirety using the S.M.A.R.T. Read Attribute Thresholds. All multibyte fields shown in
these data structures follow the ATA/ATAPI-6 specification for byte ordering, that is, that the least significant byte
occupies the lowest numbered byte address location in the field.
The sequence of active Attribute Thresholds will appear in the same order as their corresponding Attribute Values.
Table 117: Device Attribute Thresholds Data Structure
Description
Data Structure Revision Number
1st Device Attribute
...
...
30th Device Attribute
Reserved

Vendor specific

Data structure checksum
(*1) – See the following definitions
(*2) – Value varies by actual operating condition
(*3) – Filled with 00h
13.39.3.1 Data Structure Revision Number
This value is the same as the value used in the Device Attributes Values Data Structure.
13.39.3.2 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.
Table 118: 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
Byte Offset
2 00h
12 02h
..
..
12 15Eh
18 16Ah
131 17Ch
1 1FFh
512
Travelstar 7K100 Hard Disk Drive Specification
174
Format Value
binary 0010h
(*1) (*2)
(*1) (*2)
(*3)
(*3)
(*2)
Byte Offset Format
1 00h binary
1 01h binary
10 02h binary
12