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GSmartControl is a graphical user interface for smartctl (from Smartmontools package), which is a tool for querying and controlling SMART (Self-Monitoring, Analysis, and Reporting Technology) data on modern hard disk drives. It allows you to inspect the drive's SMART data to determine its health, as well as run various tests on it.
What is SMART
Self-Monitoring, Analysis, and Reporting Technology, or SMART, is a
monitoring system for hard drives to detect and report various indicators of
reliability, in the hope of anticipating failures. It is implemented inside
the drives SMART provides several ways of monitoring hard drive health. It
may provide information about general health, various drive attributes (for
example, number of unreadable sectors), error logs, and so on. It may also
provide ways to instruct the drive to run various self-tests, which may report
valuable information. It may even automatically scan the disk surface in when
the drive is idle, and repair the defects, reallocating the data to more safe
areas.