I have a portable 1 TB hard disk drive. It contain various folders and it also contain the setup for windows 7 x86 and x64. I also plan to download Ubuntu and backtract later. I also have other files on this drive.
I want to make the hard disk bootable so that I can install any OS that I want through USB. I will put installation files in folders for e.g Windows 7 x86 folder, Windows 7 x64 and Backtract folder.
When I boot the hard drive, a menu should appear and ask me with OS I want to install.
I know this can be done by burning the individual OS to different DVD and then boot from DVD but its not what I want to achieve here.