Hitachi IC25N040ATMR04-0 Specifications - Page 181

Device Attribute Thresholds data structure

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13.38.3 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-3 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 115: Device Attribute Thresholds Data Structure 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 00h 02h Format binary (*1) Value 0010h (*2) 15Eh 16Ah 17Ch 1FFh (*1) (*2) (*3) (*3) (*2) (*1) - See the following definitions (*2) - Value varies by actual operating condition (*3) - Filled with 00h 13.38.3.1 Data Structure Revision Number This value is the same as the value used in the Device Attributes Values Data Structure. 13.38.3.2 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 116: 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 1 1 10 12 Offset 00h 01h Format binary binary 02h binary Travelstar 80GN Hard Disk Drive Specification 171

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Travelstar 80GN Hard Disk Drive Specification
171
13.38.3
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-3 specification for byte ordering, that is, that the least significant byte occu-
pies 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 115: Device Attribute Thresholds Data Structure
(*1) – See the following definitions
(*2) – Value varies by actual operating condition
(*3) – Filled with 00h
13.38.3.1
Data Structure Revision Number
This value is the same as the value used in the Device Attributes Values Data Structure.
13.38.3.2
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.
Description
Byte
Offset
Format
Value
Data Structure Revision Number
2
00h
binary
0010h
1st Device Attribute
12
02h
(*1)
(*2)
...
..
...
..
30th Device Attribute
12
15Eh
(*1)
(*2)
Reserved
18
16Ah
(*3)
Vendor specific
131
17Ch
(*3)
Data structure checksum
1
1FFh
(*2)
512
Table 116: Individual Threshold Data Structure
Description
Byte
Offset
Format
Attribute ID Number (01h to FFh)
1
00h
binary
Attribute Threshold (for comparison with
Attribute Values from 00h to FFh)
1
01h
binary
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)
10
02h
binary
Total Bytes
12