At the installation screen, select Disk Utility from the Utilities menu and then use the Repair Disk option from there. When your Mac restarts, select Mac OS X to boot from the DVD (unless you pressed C in the previous step) or choose the Lion Recovery HD. Restart your computer and hold down the OPTION key when you hear the chime (or just press C to automatically boot from the DVD drive). Note: Repair Disk cannot repair any disks that you have already booted from so you will need to restart from another bootable drive, or the Mac OS installation disk, or the Lion recovery HD. Use Disk Utility to check your Mac’s HD status and make any necessary repairs Disk Utility can’t fix any hardware problems with your disk, but there’s a good chance that data integrity and filesystem issues can be easily resolved. In case any issues are seen, select Repair Disk to attempt to fix them. Your disk’s status and any problems encountered will be displayed in the main window. 
It’s recommended that you check this status quite regularly because a failing disk will need to be replaced quickly.ģ. Status area which indicates whether the disk has passed the power on tests. The most important item to check initially is the S.M.A.R.T. In the left-hand side panel, select your main hard disk as shown below Open Disk Utility from the Applications -> Utilities folder or within SpotlightĢ. To check your drive with the built-in tool, follow the steps below.ġ. The quickest way to check whether your disk is functioning correctly is to use the Mac’s Disk Utility, but there are also a couple of third-party apps such as Drive Genius 3 Disk Utility
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