SMARTReporter periodically checks the built-in S.M.A.R.T. status of all compatible connected disks. S.M.A.R.T. (Self-Monitoring Analysis and Reporting Technology) is a technology built into most modern hard disk drives that acts as an "early warning system" for pending hard disk drive problems. SMARTReporter has the unique capability to check the system kernel log-file for occurrences of dangerous "I/O errors" to improve the disk failure prediction accuracy. SMARTReporter can automatically check whether connected R.A.I.D. sets become "degraded" or just "offline". SMARTReporter can also monitor the free disk space because a completely filled boot disk might lead to system lockups. SMARTReporter has completely customizable notification options for all four disk checks including notification via changing application icons, email, alert dialogue, on-screen notification (Growl or OS X 10.8 native), or by launching arbitrary applications / scripts. SMARTReporter supports a variety of advanced options and tools including automated S.M.A.R.T self-tests, scheduled S.M.A.R.T. attribute checking and plotting graphs of all acquired data over time. Please note that the S.M.A.R.T. self-test/attribute-check features aren't officially supported.