10 Replies Latest reply: Dec 13, 2011 10:08 AM by Mihai S.
Mihai S. Level 1 Level 1 (5 points)

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):
    1. http://technet.microsoft.com/en-us/magazine/dd535816.aspx
    2. http://www.microsoftstore.com/store/msstore/html/pbPage.Help_Win7_usbdvd_dwnTool
  • 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.

iMac, MacBook, MacBook Air/ Pro, Mac OS X (10.7.2)