This 650MB partition is called Recovery HD. The startup drives of Macs formatted with OS X 10.7 (Lion) or 10.8 (Mountain Lion) typically have a hidden partition designed just for moments like this. You can try each method until you find one that works:īoot from the startup drive’s Recovery HD partition When you’re done backing up, here are the things to try. At this point, you don’t want to overwrite an existing backup-lest you replace valid data with corrupted data. So what do you do instead? That depends on what Macs you own, how you have set them up, and what other precautions you may have taken prior to the start of the trouble.įirst things first, if you don’t have a recent backup, make one now. You can still use Repair Permissions, which may help in certain situations. Why? Because OS X cannot attempt repairs on an active startup drive. One problem though: Repair Disk is dimmed and you can’t select it. Hopefully, that will remedy the situation. Before panic sets in, you want to launch Apple’s Disk Utility and select Repair Disk from the First Aid tab. You suspect a problem with the hard drive. Perhaps you frequently get errors when trying to open or save files. Your Mac has begun showing signs of trouble.
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