
Open OnyX, and type your administrator password.

Click the Verifying icon, then select the SMART Status tab.

Click the Check button to immediately verify the SMART status of the startup disk.
You can use OnyX to check the SMART status of the startup disk and to provide the option of running this verification upon opening OnyX. This option performs a diagnostic that can prevent a hard disk failure. Most disks include SMART (Self-Monitoring, Analysis, and Reporting Technology) hardware, which tests and monitors the hard drive.
Important:
- Checking the SMART status of the startup disk is only possible with an ATA or Serial ATA disk. The FireWire and USB disks do not (yet) allow this in OS X.
- OnyX cannot check the SMART status of a RAID Set or Fusion Drive.
- If FileVault is turned on, checking the SMART status will not be possible (Message: The SMART status is not supported.). If you turn off FileVault, restart the computer again before checking the SMART status of the disk.
Open OnyX, and type your administrator password.
Click the Verifying icon, then select the SMART Status tab.
Click the Check button to immediately verify the SMART status of the startup disk.
The SMART Status tab of the Verifying pane displays the SMART status and the date of the last verification.
By default, OnyX asks whether you want to check the SMART status of the startup disk when OnyX opens. You can choose to automatically check it, or check it, or do nothing by selecting the corresponding option in the Advanced tab of the OnyX Preferences pane.