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.
To create this bootable USB drive, also known as a live USB, you will need access to a USB drive with at least 2 GB of storage and a functioning computer, but it does not matter if it is a Mac or Windows.
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).
![Disk Disk](/uploads/1/2/5/6/125642169/395255099.jpg)
![Boot Boot](/uploads/1/2/5/6/125642169/201152668.jpg)
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.
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