I'm not used to linux, but I've downloaded a live cd version of Ubuntu. I would like to install it on a hard drive. I already have a partitioned hard drive under windows XP, which biggest part has 119 Go on which about 80 Go are still free. Instead of installing Ubuntu in this disk, I thought about buying a new disk, say about 80Go. This way I would conserve a large space for windows, and I guess that if something goes wrong during the installation of Ubuntu I would't lose any Windows files....