If you have just installed Drupal and you’re trying to login as admin, you might get this error:
You are not authorized to access this page.
The solution is to clear your browser cache.
The simplest test is to open in a new private / anonymous tab and try to login.
So you have a large USB flash drive and you want to install Fedora on it for booting.
The problem is that large USB flash drives support NTFS and extFAT in Windows 7, while LiveUSB creator only supports FAT and FAT32. So you cannot format the drive under windows.
[SOLUTION] Is to format it as FAT32 under an existing linux distribution using GParted for example and then write your iso image using LiveUSB from windows or linux.