Drag the formatted partition to the “Destination” section, then click on “Restore”.Drag the previously mounted “Mac OS X Install ESD” image into the “Source” section.Now select the formatted USB drive from the left side and click on the “Restore” tab.Select the USB drive from the left menu and click on “Erase” tab, choose “Mac OS X Extended (Journaled)” as the format, then click on the “Erase” button in the corner.Launch Disk utility and connect a USB drive to the Mac.Make the OS X Mountain Lion Install Drive Double-click on InstallESD.dmg to mount it on the desktop.Open the “Contents” directory and then open “SharedSupport”, looking for a file named “InstallESD.dmg”.Go to the /Applications/ directory and right-click on “Install Mac OS X Mountain Lion.app” selecting “Show Package Contents”.Download OS X 10.8 Mountain Lion from the App Store.Download OS X Mountain Lion and Extract the DMG File
If you already have the Mac OS X Mountain Lion install DMG extracted, skip this first set of steps and jump directly to making the bootable drive below. We’ll walk through the process here, but don’t forget to check OS X 10.8 system requirements for the destination Mac before beginning.
You can follow us on Twitter or join our Facebook fanpage to keep yourself updated on all the latest from Microsoft, Google and Apple.By creating a bootable install drive, you can perform clean OS X 10.8 installs, install it on separate partitions, and install OS X Mountain Lion on Macs that don’t have internet connections. If USBs aren’t your thing, you can follow our guide on how to make OS X Lion bootable DVDs. Pat yourself on the back for a job well done! If you made your own flash drive following our guide, you just saved $40, my friend. You may then follow Steps 11 and 12 to install Lion on all your Macs.Īpple will make $69 USB flash drives of Lion available at Apple Stores in August. Step 12: Follow the on-screen instructions to install OS X Lion. You can now boot into your Flash drive from there. Hold the “Option” key on your keyboard when you hear the iconic OS X startup chime. Step 11: Reboot your Mac with the USB drive plugged in.
This will create the intended Lion bootable USB flash drive Step 10: Click Restore and type in your password. Step 9: Choose USB drive you plugged-in in Step 5 as “Destination” with the InstallESD.dmg file as “Source”. Step 8: Once the drive has been formatted, click on “Restore” (it’s right next to where you clicked on “Partition in Step 5). ( NOTE: This is will erase all data on your USB flash drive) Now click on Apply at the bottom right to start formatting. Select “GUID Partition Table” and press OK. Step 7: Now click on “Option” at the bottom. Choose “Mac OS Extended (Journaled)” from the left. Step 6: Select “1 Partition” from the Volume Scheme dropdown menu.
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