Confirm you would like to do this, and when complete you should have a fully bootable Mountain Lion installation drive.Ħ. Drag your destination drive (the desired USB or FireWire drive volume) to the Destination field, and then click the Restore button. When you do this you should see the disk image appear in the Source field, but if not then drag it there.ĥ. Select the InstallESD.dmg file in Disk Utility and click the Restore tab that appears in the main Disk Utility window. Optionally partition it by selecting it and using the Partition tab to split it into two logical volumes (one for the Mountain Lion installer and the other for extra storage space) by clicking the plus button to create a new partition, and then setting the first partition to be 4.8GB in size.Ĥ. Connect a spare USB or FireWire drive that has at least 6GB of capacity, which should show up in Disk Utility. If you wish to create a USB or FireWire install drive instead, then continue on to step 3.ģ. In Disk Utility select the InstallESD.dmg file, and then you can click the Burn icon in Disk Utility’s toolbar to burn the image to a DVD (single-layer 4.7GB discs do not have enough space, so use dual-layer 8.5GB discs). Open Disk Utility (in the Applications > Utilities folder) and drag the InstallESD.dmg image to the device sidebar, where it should appear under your various disk and volumes listings.Ģ.
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