IBM DTLA-305040 Hard Drive Specifications - Page 177

Command Block Input

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12.32 S.M.A.R.T. Function Set (B0h) Command Block Output Registers Register 7 6 5 4 3 2 1 0 Data Feature V V V V V V V V Sector Count V V V V V V V V Sector Number Cylinder Low 0 1 0 0 1 1 1 1 Cylinder High 1 1 0 0 0 0 1 0 Device/Head 1 - 1 D - - - - Command 1 0 1 1 0 0 0 0 Command Block Input Registers Register 7 6 5 4 3 2 1 0 Data Error see below Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status see below Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 0V0V0V0V Status Register 7 6 5 4 3 2 10 BSY RDY DF DSC DRQ COR IDX ERR 0 V 0 V - 0 -V Figure 127. S.M.A.R.T. Function Set Command (B0h) The S.M.A.R.T. Function Set command provides access to Attribute Values, Attribute Thresholds, and other low level subcommands that can be used for logging and reporting purposes and to accommodate special user needs. The S.M.A.R.T. Function Set command has several separate subcommands which are selectable via the Features Register of the device when the S.M.A.R.T. Function Set command is issued by the host. In order to select a subcommand the host must write the subcommand code to the Features Register of the device before issuing the S.M.A.R.T. Function Set command. The subcommands and their respective codes are listed below. Code D0h D1h D2h D3h D4h D5h D6h D8h D9h DAh DBh Subcommand SMART Read Attribute Values SMART Read Attribute Thresholds SMART Enable/disable Attribute Autosave SMART Save Attribute Values SMART Execute Off-line Immediate SMART Read Log Sector SMART Write Log Sector SMART Enable Operations SMART Disable Operations SMART Return Status SMART Enable/Disable Automatic Off Line Deskstar 40GV & 75GXP hard disk drive specifications 165

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12.32 S.M.A.R.T. Function Set (B0h)
see below
Status
1 0 1 1 0 0 0 0
Command
- - - - - - - -
Device/Head
1 - 1 D - - - -
Device/Head
- - - - - - - -
Cylinder High
1 1 0 0 0 0 1 0
Cylinder High
- - - - - - - -
Cylinder Low
0 1 0 0 1 1 1 1
Cylinder Low
- - - - - - - -
Sector Number
- - - - - - - -
Sector Number
- - - - - - - -
Sector Count
V V V V V V V V
Sector Count
see below
Error
V V V V V V V V
Feature
- - - - - - - -
Data
- - - - - - - -
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input
Registers
Command Block Output
Registers
V
–
0
–
V
0
V
0
V
0
V
0
V
0
V
0
ERR
IDX
COR
DRQ
DSC
DF
RDY
BSY
AMN
T0N
ABT
0
IDN
0
UNC
CRC
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Status Register
Error Register
Figure 127. S.M.A.R.T. Function Set Command (B0h)
The S.M.A.R.T. Function Set command provides access to Attribute Values, Attribute Thresholds, and
other low level subcommands that can be used for logging and reporting purposes and to accommodate
special user needs. The S.M.A.R.T. Function Set command has several separate subcommands which
are selectable via the Features Register of the device when the S.M.A.R.T. Function Set command is
issued by the host.
In order to select a subcommand the host must write the subcommand code to the Features Register of
the device before issuing the S.M.A.R.T. Function Set command. The subcommands and their respective
codes are listed below.
SMART Enable/Disable Automatic Off Line
DBh
SMART Return Status
DAh
SMART Disable Operations
D9h
SMART Enable Operations
D8h
SMART Write Log Sector
D6h
SMART Read Log Sector
D5h
SMART Execute Off-line Immediate
D4h
SMART Save Attribute Values
D3h
SMART Enable/disable Attribute Autosave
D2h
SMART Read Attribute Thresholds
D1h
SMART Read Attribute Values
D0h
Subcommand
Code
Deskstar 40GV & 75GXP hard disk drive specifications
165