SMARTReporter 2.4.5 - Hard drive pre-failure warning utility. (Free)

SMARTReporter is an application that can warn you of some hard disk drive failures before they actually happen! It does so by periodically polling the S.M.A.R.T. status of your hard disk drive. 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 can notify you of impending hard disk drive failures by sending e-mails, displaying a warning dialog or executing an application. The current status of your hard disk drives is always displayed through the customizable menu item. Because SMARTReporter relies on the S.M.A.R.T. implementation of Mac OS X, it only supports ATA, SATA or eSATA hard disk drives, if you want S.M.A.R.T. support for your FireWire hard disk drive, send feedback to Apple. Please note that a S.M.A.R.T. alert doesn't mean that your HDD will completely fail for sure, nor can S.M.A.R.T. catch all possible HDD errors - it's just a very valuable indicator.

• SMARTReporter can now display all S.M.A.R.T. attributes by right-clicking a drive in the preferences window (thanks to the smartmontools project for the attribute calculation)
• SMARTReporter can now perform a short "S.M.A.R.T. self-test" by right-clicking a drive in the preferences window (thanks to the smartmontools project for the self-test procedure)
• Fix annoying messages being printed to SMARTReporters log-file during its first run
• SMARTReporter automatically restarts itself when turning off visibility in the Menubar