I created a bootable partion on a Toshiba Canvio 2 for LinuxMint, leaving one other partition of same size for possibly another install in the future and the rest of the drive is for storage and back up. It works beautifully and I am quite happy with it. On my internal drive I have a dual boot , Win 7 and Fedora 22.
When I boot up my machine it goes straight to grub where I can choose Windows or Fedora. Choosing Windows then sends me on to the Windows bootloader and from there on to Windows (chain boot?). To boot into my external I must hit F12 for boot options. I wind up in grub where I can choose Mint, Fedora, and Win7. ( I created the boot partition on the external at the front of the disk )
This entire thing was for me to learn and understand creating partitions for swap, root, home, boot all on my own trying to understand the process. My question is this - say I want to have the option of booting into my external from the main grub screen , what would I have done differently? And what would I do now to change it?