Installation
In the BIOS, set that the external hard disk to be the second boot device (the CDROM being the first). Remove the main hard drive (for the sake of making the installation easier), then boot from and install from the Ubuntu Live CD using all defaults. Put the hard drive back in.
Whenever you want to boot to Ubuntu, plug in the USB hard drive and whenever you want to use XP i just disconnect it. It works like a charm.
USB
USB external hard disk that works with Ubuntu:
FireWire
- See ["/Firewire"]