![]() ![]() How to create a OS X Lion or Mountain Lion USB drive in 3 easy steps! You will need a 8Gb or lager USB. Jan 26, 2014 Hi - I recently bought a new 15' MacBook Pro with Retina Display, which came pre-installed with Mavericks (10.9.0). I want to make a bootable USB disk of the system software, and have successfly used DiskMaker X (formerly Lion DiskMaker) to make the USB boot disks for Lion and Mountain Lion. Image via Before You Start The obvious first step here is to. But before you do anything else, a word of caution: once you've used the OS X installer, it will automatically delete the file you need to make the backup disk, so you'll want to either make a copy of the installer or create your disk before you upgrade. You can use a USB flash drive, external hard drive, or DVD-R disc, but the USB drive is quicker. If you're using a USB drive, it has to be formatted as 'Mac OS Extended (Journaled)' and set to partition type 'GUID Partition Table' in order to work. Image via Once inside, browse to the ' Contents > SharedSupport' folder where there will be a file called ' InstallESD.dmg.' This is the image file that contains the information you need to create the backup disk. Step 2: Open Disk Utility (located in your Applications > Utilities folder). Step 3: Drag and drop the ' InstallESD.dmg' into the list of drives on the left and select it. Where does word for mac store temporary files. This should make it appear in the Source box on the right. If not, you may have to click the ' Restore' tab as seen below.
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