Mount iso on mac for bootable usb

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Your thumb drive or external hard drive is now ready.

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Click Done when the process is complete.If Scheme is available, select GUID Partition Map.Select Mac OS Extended from the format list.If you have more than one external drive with the same name, you will need to rename the drive you are using as a bootable installer now.

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Scroll down and double-click on Disk Utility. Select Applications from the list on the left side of the window. You'll need to start with a clean thumb drive or external hard drive to make it a bootable drive. How to format your external drive for macOS Big Sur

 

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