![]() Quit Disk Utility and choose Install OS X.Open Disk Utility, select the Macintosh HD volume, open the erase tab, and press the erase button.If others search for how to do a normal erase and reinstall, erase the main OS X partition (like Macintosh HD) instead of the whole drive: ![]() If you have one of those Macs, you erase the whole drive from the recovery partition, and it is not in fact possible to reinstall OS X without starting up in Internet Recovery mode after that, you can probably use Recovery Disk Assistant instead. Some older Macs support a recovery partition but not Internet Recovery mode. But if you restart the Mac, it will start up in Internet Recovery mode, which means that it downloads a disk image of the recovery system from Apple's servers, and you can then install OS X on the empty drive. When I did this with my MacBook Air, I restarted it after I had erased the drive, so I don't know if it is possible to reinstall OS X from the recovery partition without relying on Internet Recovery mode. It also erases the hidden recovery and EFI partitions. ![]() Open Disk Utility, select the drive (not the Macintosh HD volume), open the erase tab, set the format to Mac OS Extended (Journaled), and press the erase button.Start up from the recovery partition by holding command-R.You can erase the drive and reinstall OS X using the recovery system: ![]()
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