Create os x lion bootable usb5/20/2023 The GUID partiton is set in the options button at the bottom. To install Lion without erasing your Mac's hard drive, restart using your new boot volume, and select Reinstall Mac OS X as outlined in Step 7, but without using Disk Utility to wipe the boot drive. This is done in Disk Utility in the Applications/Utilities folder, select the drive on the left, choose the erase tab, and look at the format, if it is wrong, simply erase it with the right format. Not all USB drives can be used with a Mac right out of the box. Make Sure Your USB Drive Is Formatted for a Mac. hes not trying to install OS X on a windows computer hes trying to make a bootable USB so he can install a fresh copy of OS X on a mac. How to Create a Bootable Flash Drive for Installing OS X Lion Putting a Bootable Lion Installation on a Flash Drive. To be able to boot from the external drive you need to ensure that it is formatted correctly – it needs to be Mac HFS+ Extended Journaled, with a GUID partition. I hate to be a dick but I swear the people who answered this question cant read. You can use as a backup method and also to make an external device bootable via USB or Firewire, so you could boot from the external device and run utilities on your main hard drive such as a Disk Warrior or any disk repair utility. Without a doubt the easiest way to make a copy, clone or image of your Mac OSX Lion 10.7 computer that you can boot from, is using a product called Carbon Copy Cloner, using this application is straightforward and avoids any work in the Terminal and been around for a long time and is simply bulletproof.
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