Utilizzare il pannello Utility per verificare la struttura del file system sul disco di avvio.
Importante: Intanto, OnyX deve bloccare temporaneamente il volume di avvio. The wait cursor (which looks like a colored pinwheel) will appear, and your computer will seem to be unresponsive. This is completely normal. This operation can take a very long time to complete (from some minutes to several hours), so wait for the verification to finish.
It is possible to speed up the verification by deleting the Time Machine local snapshots beforehand.