IBM DTTA-351010 Hard Drive Specifications - Page 158

Device Attributes Data Structure

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12.31.2 Device Attributes Data Structure The following defines the 512 bytes that make up the Attribute Value information. This data structure is accessed by the host in its entirety using the SMART Read Attribute Values subcommand. All multi-byte fields shown in these data structures follow the ATA/ATAPI-4 specifications for byte ordering, namely that the least significant byte occupies the lowest numbered byte address location in the field. Description Bytes Offset Format Data Structure Revision Number 2 00h binary 1st Device Attribute 12 02h (*1) ... .. ... .. 30th Device Attribute 12 15Eh (*1) Off line data collection status 1 16Ah (*1) Total segments required for off line data collection 1 16Bh (*1) Total time in seconds to complete next segment 2 16Ch (*1) Current segment pointer 1 16Eh (*1) Off line data collection capability 1 16Fh (*1) S.M.A.R.T. capability 2 170h (*1) Reserved 16 172h Vendor specific 125 182h Data structure checksum 1 1FFh 512 Value 0005h (*2) (*2) (*2) 01h (*2) (*2) 05h 03h (*3) (*3) (*2) (*1) See following definitions (*2) Value varied by actual operating condition (*3) Filled with 00h Figure 114. Device Attribute Data Structure 12.31.2.1 Data Structure Revision Number The Data Structure Revision Number identifies which version of this data structure is implemented by the device. This revision number will be set to 0005h. This revision number identifies both the Attribute Value and Attribute Threshold Data structures. 150 OEM Specifications for DTTA-3xxxxx

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12.31.2
Device Attributes Data Structure
The following defines the 512 bytes that make up the Attribute Value information. This data structure is
accessed by the host in its entirety using the SMART Read Attribute Values subcommand. All multi-byte
fields shown in these data structures follow the ATA/ATAPI-4 specifications for byte ordering, namely that
the least significant byte occupies the lowest numbered byte address location in the field.
Description
Bytes Offset
Format
Value
Data Structure Revision Number
2
00h
binary
0005h
1st Device Attribute
12
02h
(*1)
(*2)
...
..
...
..
30th Device Attribute
12
15Eh
(*1)
(*2)
Off line data collection status
1
16Ah
(*1)
(*2)
Total segments required for
1
16Bh
(*1)
01h
off line data collection
Total time in seconds to
2
16Ch
(*1)
(*2)
complete next segment
Current segment pointer
1
16Eh
(*1)
(*2)
Off line data collection capability
1
16Fh
(*1)
05h
S.M.A.R.T. capability
2
170h
(*1)
03h
Reserved
16
172h
(*3)
Vendor specific
125
182h
(*3)
Data structure checksum
1
1FFh
(*2)
512
(*1)
See following definitions
(*2)
Value varied by actual operating condition
(*3)
Filled with 00h
Figure 114. Device Attribute Data Structure
12.31.2.1
Data Structure Revision Number
The Data Structure Revision Number identifies which version of this data structure is implemented by the
device. This revision number will be set to 0005h. This revision number identifies both the Attribute Value
and Attribute Threshold Data structures.
150
OEM Specifications for DTTA-3xxxxx