I have looked through similar issues on this site and through Googling but haven't found a solution. I have gotten this far solving a lot of issues so far, but now I am stuck, so PLEASE help! I've upgraded to Mavericks and want to boot up from a USB that I have put Windows 7 on using Boot Camp Assistant. I was able to edit the info.plist file and grant admin through terminal to give the option in Boot Camp to install Windows 7 on a USB drive. Upon restarting and holding down option, there is no bootable USB drive noticed. So after googling I installed the refit utility as it was supposed to fix this issue. After rebooting 3 times (as I have read in an article to reboot twice and it will show) I still do not see the USB drive to boot from. Side note with the partition I have setup. Using Disk Utility I have partitioned 900GB for my Mac and partitioned 100GB for Windows in MS-DOS Fat format. I have read it should be NTFS but I don't see that option there. When using Boot Camp I haven't seen the option to partition the drive for Mac and Windows like is shown here. Do I need to re-partition my 1TB drive to Journaled Mac and than hopefully when using Bootcamp it will ask to me to partition there or will the partition I setup through Disk Utility work? I hope this setup works because I don't want to reformat the drive but if I have to I will. Also, just to inform I am using a Macbook Pro 2011 model with SuperDrive. I have read that Apple wants you to boot from DVD for those with drives and from USB for those without them, but is it possible to make a bootable USB drive that is recognized upon startup or do I HAVE to install Windows 7 from the DVD drive? Thanks for any help ahead of time.