How to Create a Windows 7 USB install disk

If you want to install Windows from a USB drive, you'll need the Boot Camp Assistant (version 4.0.1) and a MacBook Air. I don't know why it won't let you do it on other Macs and MacBooks (the option still shows up, only it's greyed out) - if you made it work on anything other than a MacBook Air, let me know how you did it. So, besides that, you also need an empty USB drive and a genuine Windows ISO file.

However, if in your case the Windows USB creation option is greyed out, this is what you can do:

You create the Windows installation USB, using one of these two ways (I used the first one):

• You create the Windows partition with BCA.
• In System Settings, you choose the newly created BOOTCAMP partition as the startup disk and restart your Mac.
• Have your Windows USB inserted before your Mac restarts.
• As soon as your Mac boots from the BOOTCAMP partition, it should start loading Windows Setup from the USB drive.

I have an early 2009 MacBook and these steps worked for me. It's a workaround... but it works. Let me know if it worked for you.

* If none of this works for you, there is another workaround, using 3rd party software (rEFIt). However, I don't recommend using it, unless you know what you're doing.

* Disclaimer - This info comes as is and I do not guarantee that it will work for you. Nor do I guarantee that it will not cause any malfunction to occur on your Mac computer.