GSmartControl is a graphical user interface (GUI) 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 and solid-state drives. It allows you to inspect the drive's SMART data to determine its health, as well as run various tests on it.
Note: GSmartControl supports ATA drives (both PATA and SATA), various USB to ATA bridges and drives behind some RAID controllers (selected models of 3ware, Areca, Adaptec, Intel RAID controllers). See Smartmontools USB Device Support page for an (incomplete) list of supported USB to ATA bridges.
automatically reports and highlights any anomalies;
allows enabling/disabling SMART;
allows enabling/disabling Automatic Offline Data Collection - a short self-check that the drive will perform automatically every four hours with no impact on performance;
supports configuration of global and per-drive options for smartctl;
performs SMART self-tests;
displays drive identity information, capabilities, attributes, and self-test/error logs;
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.