Device Attribute Data Structure; Table 123: Device Attribute Data Structure - Hitachi HTS421212H9AT00 - Travelstar 120 GB Hard Drive Specifications

13.39.2 Device Attribute 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-7 specification for byte ordering, namely, that the least significant byte
occupies the lowest numbered byte address location in the field.

Table 123: Device Attribute Data Structure

Description
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
(*1) – See following definitions
(*2) – This value varies due to actual operating condition.
(*3) – Filled with 00h.
13.39.2.1 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.
Travelstar 4K120 Hard Disk Drive Specification
177
Byte Offset Format
2 00h binary
12 02h
12 15Eh
1 16Ah
1 16Bh
2 16Ch
1 16Eh
1 16Fh (*1)
2 170h
1 172h (*1)
1 173h
1 174h (*1)
1 175h (*1)
12 176h
125 182h
1 1FFh
512
Value
0010h
(*1) (*2)
(*1) (*2)
(*1) (*2)
(*1) (*2)
(*1) (*2)
(*1) (*2)
1Bh
(*1) 0003h
01h
(*1) (*2)
(*2)
(*2)
(*3)
(*3)
(*1) (*2)