Device Attributes Data Structure; Figure 118. Device Attribute Data Structure - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

13.33.2 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 S.M.A.R.T. Read Attribute Values subcommand. All multibyte
fields shown in these data structures follow the ATA/ATAPI-5 specification for byte ordering, namely that
the least significant byte occupies the lowest numbered byte address location in the field.
Data Structure Revision Number
1st Device Attribute
30th Device Attribute
Off-line data collection status
Self-test execution status
Total time in seconds to complete off-line
data collection activity
Current segment pointer
Off-line data collection capability
S.M.A.R.T. capability
S.M.A.R.T. device error logging capability
Self-test failure check point
Short self-test completion time in minutes
Extended self-test completion time in minutes
Reserved
Vendor specific
Data structure checksum

Figure 118. Device Attribute Data Structure

(*1) - See the paragraphs below for definitions of titles in the Description
column.
(*2) - This value varied due to actual operating condition.
(*3) - Filled with 00h
13.33.2.1 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.
Description
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Byte
2
12
12
1
1
2
1
1
2
1
1
1
1
12
125
1
512
174
Offset Format Value
00h binary 0010h
02h (*1)
15Eh (*1)
16Ah (*1)
16Bh (*1)
16Ch (*1)
16Eh (*1)
16Fh (*1)
170h (*1) 0003h
172h (*1)
173h (*1)
174h (*1)
175h (*1)
176h
182h
1FFh (*1)
(*2)
(*2)
(*2)
(*2)
(*2)
(*2)
1Bh
01h
(*2)
(*2)
(*2)
(*3)
(*3)
(*2)