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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.

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.

FEATURES:

automatically reports and highlights any anomalies;
allows enabling/disabling SMART;
supports configuration of global and per-drive options for smartctl;
performs SMART self-tests;
displays drive identity information, capabilities, attributes, device statistics, etc…;
can read in smartctl output from a saved file, interpreting it as a read-only virtual device;
works on most smartctl-supported operating systems;
has extensive help information.