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I used Bootcamp (5.0) to create a Windows 7 install USB. It successfully created the install USB but when I reboot the system and hold down the option-key to boot from the USB drive, the boot-loader doesn't give me the option of booting from USB.

I also tried recreating the install USB from another Windows 7 machine using Microsoft's own Windows 7 USB creation tool but I still don't get the option of booting from USB on my mac.
What am I doing wrong here? Any Ideas?

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Do you have to do it manually? From experience, I just had to create the disk, and Boot Camp automatically rebooted to the drive. –  Ethan Lee Nov 20 '12 at 21:50
    
Have a look at apple.stackexchange.com/a/62700/49601 –  Danijel J Oct 1 '13 at 11:26

2 Answers 2

You need to format the USB drive to use the GUID partition type -- use the Disk Utility on your Mac.

source Apple support docs

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As far as I know, if your mac still has an optical drive, you are forced to boot Windows from a DVD (and won't be able to boot it up from the USB).

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Do you have anything to support this? –  Danijel J Oct 1 '13 at 11:25

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