For more on Mountain Lion, be sure to read the official Cult of Mac review. If you’d rather install Mountain Lion without a bootable copy and keep your setup the way it is, refer to our general tutorial. Choose your Mac’s hard drive and begin installing Mountain Lion.īy following those steps, your Mac will be restored to Apple’s stock setup and all of your personal files will be gone. Once your Mac’s hard drive is erased, quit Disk Utility and go back into the Mountain Lion installer.(Make sure you have a backup first, just in case.)
From the erase tab, choose “Mac OS Extended (Journaled)” and wipe your drive.
Follow the instructions until you see a menu bar at the top of the screen, and. When you see the gray Apple logo, release the c key.
#MAC OS X BOOT DISK SELECTION MAC OS X#
In Mac OS X 10.6 or earlier, to partition your startup disk, insert a Mac OS X install disc in your computer, and then restart the computer while holding down the c key. Inside the Mountain Lion installation tool, you can open Disk Utility and erase your Mac’s hard drive. Click Disk Utility and then click Continue.Restart your Mac while holding down the option key. Startup 9.2.1 repairs problems that may occur when Mac OS 9.1 and Mac OS X are on the same partition and a version earlier than Startup 9.2 has been used.For a clean install of Mountain Lion on any compatible Mac, follow these steps: Now that you have a bootable copy of Mountain Lion, this drive/disk acts as a full-fledged setup tool for upgrading other Macs to the new OS.