From the screen that appears, select the cloned drive. To do so, restart while holding down the Option key. If you created a clone of your startup drive, you can boot from the clone and run Disk Utility from there. Launch Disk Utility, choose your startup drive in the list, and select Repair Disk. Once booted, things should work nearly identically to starting up from the Recovery HD partition. From the screen that appears, select the emergency drive. Restart while holding down the Option key. If you previously created an emergency drive (see “Mac troubleshooting: Be prepared for hard-drive failure”), now is the time to use it.
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In either case, it’s time to move on to the next repair attempts.īoot from your emergency drive If you’ve prepared ahead, you can boot your Mac from your emergency flash drive and perform repairs. If you are unable to boot Recovery HD via either of these methods, it means there is no Recovery HD partition on your drive or your drive is too damaged to allow successful booting from the partition. From Recovery HD, you can also browse the Web for troubleshooting info using Safari as well as erase your startup drive and restore its contents from a Time Machine backup. You should now be able to select Repair Disk for that drive. Open Disk Utility and locate the name of your startup drive.
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If you are able to boot from Recovery HD, Disk Utility will be one of its four main options. To be able to repair your normal startup drive, choose the Recovery drive (Recovery-10.8.1 here) from the Startup Manager. Boot your Mac from Recovery HD by holding down Command-R at startup (or by choosing it from within Startup Manager, which you access by holding down Option at startup). 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.
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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.