So I have an old Asus notebook that doesn't turn on anymore, however it has come to my attention that the HDD seems to be working just fine since I tried it in another laptop and it boots right away. I got a new Lenovo notebook about a few months ago but this time I'm using ElementaryOS to boot. I was thinking in buying one of those external enclosure disk cases to be able to still use that other HDD and I've been reading a lot on how to make it bootable from USB and every single tutorial is telling how to partition it to install the new OS, but I just want to know if having that already running Win 8.1 if I plug it to the USB port and set it as the primary boot in the BIOS will it work automatically or should I go through all the partiontion thing and reinstall everything again? On the other hand, let's asume it does work automatically, what would happen if I have it unplugged? will the HDD of the notebook boot with eOS as it used to? thanks!