11.42.3 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 SMART Read Attribute Thresholds. All multi-byte fields shown in these data structures follow the ATA/ATAPI-7 specification for byte ordering, namely 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

Bytes

Offset

Value

 

 

 

 

Data Structure Revision Number

2

00h

0010h

 

 

 

 

1st Attribute Threshold

12

02h

 

..

 

 

 

 

 

 

..

 

 

 

 

 

 

30th Attribute Threshold

12

15Eh

 

Reserved

18

16Ah

00h

 

 

 

 

Vendor specific

131

17Ch

00h

 

 

 

 

Data structure checksum

1

1FFh

 

 

 

 

 

 

512

 

 

 

 

 

 

Table 153 Device Attribute Thresholds Data Structure

11.42.3.1Data Structure Revision Number

This value is the same as the value used in the Device Attributes Values Data Structure.

11.42.3.2Individual 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.

Description

Bytes

Offset

 

 

 

Attribute ID Number (01h to FFh)

1

00h

 

 

 

Attribute Threshold

1

01h

 

 

 

Reserved (00h)

10

02h

 

 

 

Total Bytes

12

 

 

 

 

Table 154 Individual Threshold Data Structure

11.42.3.3Attribute ID Numbers

Attribute ID Numbers supported by the device are the same as Attribute Values Data Structures.

11.42.3.4Attribute Threshold

These values are preset at the factory and are not meant to be changeable.

11.42.3.5Data Structure Checksum

The Data Structure Checksum is the 2‟s compliment of the result of a simple 8-bit addition of the first 511 bytes in the data structure.

Hitachi hard disk drive specifications

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Hitachi HDS721075CLA332, HCS721050CLA382 Device Attribute Thresholds Data Structure, Individual Thresholds Data Structure

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