Find the file labeled 'installESD. Select the target drive (the startup drive you erased earlier), then select Install. dmg install file and open the 'shared support' folder contained inside. Create volume name, choose Options > GUID > Apply To boot: Insert flash drive in Mac and restart 7) Finally, use your bootable flash drive to install Lion on. You can make a bootable USB drive or disk from the Recovery Partition, but involves a small trip to the Terminal…. The installer displays a list of drives on which you can install Mountain Lion. If you bought a new machine from Apple you have OS X 10.8 already installed – but no back up disk! and since you haven’t bought the OSX Lion 10.8 App from the App store you can’t re-download it – so thats why you have the recovery drive as a partition in your main hard drive, to boot from it you need to restart the machine and when it starts to boot hold down “command” + “r” keys.įrom recovery mode you can run Disk Utility, access the command line, get online help and do a restore from a Time Machine backup and re-install Mountain Lion leaving all your other files intact – it just replaces the core operating system. Purchase Mac OS X Lion installer on the Apple Store When it was still.

dmg located inside of the Install OS X Mountain Lion. cdr but you canIn Disk Utility I see two disk images (Flash Updates). On every OS X 10.8 Mountain Lion install a hidden partition is present to enable a method for Mountain Lion to be reinstalled on the machine, it is known as the Recovery Partition or drive and is 650mb in size. From within the EFI, you can select the USB bootable disk as the volume to start your computer.

Mountain lion install disk