Select the drive in Disk Utility and then thePartition Tab. Within OS X Utilities, choose Reinstall OS X. Prepare a clean external drive (at least 10 GB of storage). The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Now your Mac system will have both a Mountain Lion install as well as the. Select the Current drop down menu, followed by 1 partition and then click on Options and choose GUID Partition table. With your hard drive selected go into the Partition tab. run the mountain lion installer and install on the new disk/partition you created in step 1 - it will also create another recovery partition from this same part of the disk. With Disk Utility open you will need to select the hard drive you wish to install Mountain Lion to. Some features require a compatible Internet service provider fees may apply. Install older OS X onto an external drive. Reboot Yosemite and then boot from the USB thumb drive by holding down the option key.
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