PRELIMINARY/CONFIDENTIAL
MACH2 2.5-Inch Serial ATA Solid State Drive
23
S.M.A.R.T. Support
S.M.A.R.T. is an acronym for Self-Monitoring, Analysis and Reporting Technology. The S.M.A.R.T.
feature set protects the user from unscheduled downtime by monitoring and storing critical drive
performance and calibration parameters. A S.M.A.R.T. feature set device attempts to predict the
occurrence of near-term degradation or fault conditions. The host system is warned of a negative
reliability condition, which in turn warns the user of the impending risk of data loss. The user can then
take appropriate action to minimize the risk.
Support for the S.M.A.R.T. feature set is indicated by the Identify Device (ECh) command:
S.M.A.R.T. Commands
Table 12 lists the commands that are identified by the value placed in the Feature register.
Table 12.
S.M.A.R.T. Command Values
Word 82
Bit 0
The S.M.A.R.T. feature set is supported. This information is set during the drive
initialization sequence.
Word 85
Bit 0
The S.M.A.R.T. feature set has been enabled via the SMART ENABLE
OPERATIONS command. The information is dynamic; the SMART ENABLE
OPERATIONS command and SMART DISABLE OPERATIONS command are
invoked. The most current setting must be reflected in the output of the IDENTIFY
DEVICE command. S.M.A.R.T. operations are enabled by default.
Value
Command
Note
00h-CFh
Reserved
RSVD
D0h
SMART READ DATA
Optional
D1h
Obsolete
OBS
D2h
SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE Mandatory
D3h
Obsolete
OBS
D4h
SMART EXECUTE OFF-LINE IMMEDIATE
Optional
D5h
SMART READ LOG
Optional
D6h
SMART WRITE LOG
Optional
D7h
Obsolete
OBS
D8h
SMART ENABLE OPERATIONS
Mandatory
D9h
SMART DISABLE OPERATIONS
Mandatory
DAh
SMART RETURN STATUS
Mandatory
DBh
Obsolete
OBS
DCh-DFh
Reserved
RSVD
E0h-FFh
Vendor-Specific
VSC
electronic components distributor