The GUID partiton is set in the options button at the bottom. 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. 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. Boot OS X, Windows, and Linux in UEFI or legacy mode on Mac or PC with UEFI. 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. There may be another way, but if you create a USB OS X Install Disk (using a. ![]() 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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