IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 182

Device Attributes Data Structure

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A value of zero written by the host into the Sector Count register of the device before issuing this subcommand causes the feature to be disabled. Disabling this feature does not preclude the device from saving attribute values to nonvolatile memory during some other normal operation such as during a power-on or power-off sequence or during an error recovery sequence. A value of F8h written by the host into the Sector Count register of the device before issuing this subcommand causes this feature to be enabled. Any other nonzero value written by the host into this register before issuing this subcommand is vender specific and does not change the current Automatic Off-line Data Collection status, but the device may respond with the error code specified in Figure 151 on page 177. 11.33.2 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 SMART Read Attribute Values subcommand. All multibyte fields shown in these data structures are in byte ordering, that is, the least significant byte occupies the lowest numbered byte address location in the field. 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 Vendor specific Off-line data collection capability SMART capability SMART 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 Byte 2 12 .. .. 12 1 1 2 1 1 2 1 1 1 1 12 125 1 512 Offset Value 00h 0010h 02h 15Eh 16Ah 16Bh 16Ch 16Eh 16Fh 170h 172h 173h 174h 175h 176h 182h 1FFh 1Bh 0003h 01h Figure 142. Device Attributes Data Structure 11.33.2.1 Data Structure Revision Number The Data Structure Revision Number identifies which version of this data structure is implemented by the device. This revision number identifies both the Attribute Value and Attribute Threshold Data structures. Deskstar 120GXP hard disk drive specifications 168

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A value of zero written by the host into the Sector Count register of the device before issuing this sub-
command causes the feature to be disabled. Disabling this feature does not preclude the device from
saving attribute values to nonvolatile memory during some other normal operation such as during a
power-on or power-off sequence or during an error recovery sequence.
A value of F8h written by the host into the Sector Count register of the device before issuing this sub-
command causes this feature to be enabled. Any other nonzero value written by the host into this register
before issuing this subcommand is vender specific and does not change the current Automatic Off-line
Data Collection status, but the device may respond with the error code specified in Figure 151 on page
177.
11.33.2 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 SMART Read Attribute Values subcommand. All multibyte
fields shown in these data structures are in byte ordering, that is, the least significant byte occupies the
lowest numbered byte address location in the field.
512
1FFh
1
Data structure checksum
182h
125
Vendor specific
176h
12
Reserved
175h
1
Extended self–test completion time in minutes
174h
1
Short self–test completion time in minutes
173h
1
Self–test failure check point
01h
172h
1
SMART device error logging capability
0003h
170h
2
SMART capability
1Bh
16Fh
1
Off–line data collection capability
16Eh
1
Vendor specific
16Ch
2
Total time in seconds to complete
off–line data collection activity
16Bh
1
Self–test execution status
16Ah
1
Off–line data collection status
15Eh
12
30th Device Attribute
..
...
..
...
02h
12
1st Device Attribute
0010h
00h
2
Data Structure Revision Number
Value
Offset
Byte
Description
Figure 142. Device Attributes Data Structure
11.33.2.1
Data Structure Revision Number
The Data Structure Revision Number identifies which version of this data structure is implemented by the
device. This revision number identifies both the Attribute Value and Attribute Threshold Data structures.
Deskstar 120GXP hard disk drive specifications
168