Device Attribute Thresholds Data Structure; Figure 126. Device Attribute Thresholds Data Structure - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

13.32.3 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-5 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.
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

Figure 126. Device Attribute Thresholds Data Structure

13.32.3.1 Data Structure Revision Number
This value is the same as the value used in the Device Attributes Values Data Structure.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Byte Offset Format
2 00h binary
12 02h
..
..
12 15Eh
18 16Ah
131 17Ch
1 1FFh
512
175
Value
0010h
(*1) (*2)
(*1) (*2)
(*3)
(*3)
(*2)