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Toshiba Corporation Digital Media Network Company
Page 139 of 153
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11.10 Self-Monitoring, Analysis and Reporting Technology
Self-monitoring, analysis and reporting technology (SMART) is the function to protect user data and to
minimize the likelihood of unscheduled system downtime that may be caused by predictable degradation
and/or fault of the drive. By monitoring and storing the critical performance and calibration parameters,
SMART drives attempt to predict the likelihood of near-term degradation or fault condition. The host system
warns the user of the impending risk of data loss and advises the user of appropriate action by informing the
host system of the negative reliability .
SMART commands use a single command code and are differentiated by the value placed in the Features
register.
The Commands supported by this feature set are:
.
• SMART READ ATTRIBUTE VALUES
• SMART READ ATTRIBUTE THRESHOLDS
• SMART ENABLE/DISABLE ATTRIBUTE AUTOSAVE
• SMART SAVE ATTRIBUTE VALUE
• 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
11.10.1 Attributes
Attributes are the specific performance or calibration parameters that are used in analyzing the status of the
drive. Attributes are selected by the drive manufacturer based on that attribute’s ability to predict degrading or
faulty conditions for that particular drive. The specific set of attribute being used and the identity of these
attributes is vendor specific and proprietary.
11.10.2 Attributes values
Attribute values are used to measure the relative reliability of individual performance or calibration attributes.
11.10.3 SMART function default setting
The drives are shipped from the drive manufacturer’s factory with the SMART feature disabled. SMART
feature will be enabled by the system manufacturer or the application.