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# Check the S.M.A.R.T. status of the hard disk

OnyX allows you to check the S.M.A.R.T. status of the startup disk and the option of running this verification upon launching OnyX. This option performs a diagnostic which may prevent a HD failure. Most disks include S.M.A.R.T. hardware (Self-Monitoring Analysis and Reporting Technology) which tests and monitors the drive.
Warning: Checking the S.M.A.R.T. status of the startup disk is only possible with an ATA or Serial ATA disk. The Firewire, USB and SCSI disks do not (yet) allow this under Mac OS X. OnyX cannot check the S.M.A.R.T. Status of a RAID Set.

Run OnyX and type your administrator password.

Click the Verify icon then choose the S.M.A.R.T. Status tab

Click the Check button to immediately verify the S.M.A.R.T. status of the startup disk.

The S.M.A.R.T. Status tab of the Verifying panel displays the S.M.A.R.T. status and the date of the last verification.
By default, OnyX asks you if you want check the S.M.A.R.T. status of the startup disk at launch. You can choose to automatically check it or check it or do nothing by selecting the corresponding option in the Advanced tab OnyX Preferences panel.

### Related Topics

Error while checking the S.M.A.R.T. status of the Hard Disk