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

If OnyX detects a problem while checking the S.M.A.R.T. status of the disk, first verify that the startup disk is ATA or Serial ATA (which is the case for most newer Macs' internal disk). Indeed, as of Mac OS X this technology does not operate with Firewire, USB and SCSI (external) disks.

If your startup disk is Firewire, USB or SCSI, simply ignore this alert and disable the "Check the S.M.A.R.T. status of the hard disk at startup" option in the preferences of OnyX (Advanced tab).

If your startup disk is ATA or Serial ATA, backup the hard drive immediately.

### Related Topics

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