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After that TransMac will create bootable Mac OS USB within few minutes. Right Click on your USB drive option in TransMac and select Format Disk for Mac After that, right-click the USB Drive and select Restore with Disk Image Point to your Mac OS.dmg or.iso file by clicking the add button. The installation will be a LOT faster.Download the installer from the app store. This method will provide you with the 'classic' OSX installer, with disk utility and whatnot available before starting the install. This method allows you to create a USB that allows for quick installation and clean installs.
HOW TO CREATE BOOTABLE USB OS X MOUNTAIN LION HOW TO
Here's how to make your own Mountain Lion install DVD or USB. Click the Options button and choose 'GUID Partition Table'-this will make the drive bootable and formatted correctly for the Mac. To use either of these, insert the DVD or USB drive and restart your Mac holding down the “Option” key when you restart.
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So, in the end, you will have either a bootable DVD or USB Thumb Drive complete with that growling Mountain Lion Installer. At some time I find this terminal script, but I can't find to make Mountain Lion USB. I try to use 'InstallDiskCreator', 'DiskMaker' and Disk Utility, without success. Im using Mojave but I need to create a Bootable USB with Mountain Lion. How to Make a Bootable Mac OS X Mountain Lion 10.8 USB Thumb Drive - Purchase or Re-Download Mac OS X Mountain Lion 10.8 from the Mac App Store - Find & right-click the 'Install OS X Mountain Lion.