Hitachi IC25N040ATCS04-0 Specifications - Page 188

Device Attribute Thresholds data structure

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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 Byte 2 12 .. .. 12 18 131 1 512 Offset Format 00h binary 02h (*1) 15Eh 16Ah 17Ch 1FFh (*1) (*1) - See the following definitions (*2) - Value varies by actual operating condition (*3) - Filled with 00h Value 0010h (*2) (*2) (*3) (*3) (*2) 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 175

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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.
512
(*2)
1FFh
1
Data structure checksum
(*3)
17Ch
131
Vendor specific
(*3)
16Ah
18
Reserved
(*2)
(*1)
15Eh
12
30th Device Attribute
..
...
..
...
(*2)
(*1)
02h
12
1st Device Attribute
0010h
binary
00h
2
Data Structure Revision Number
Value
Format
Offset
Byte
Description
(*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
175