Gaaaack! 1.1 gig for studio.. Sheesh.
Yeah, it's kinda big. But it comes with a bunch of stuff.
Consider that Vista uses up about the same amount of space.
But Vista comes with Vista.
Ubuntu Studio comes with about 300 software packages installed.
If you installed XP and Photoshop and Nero and Office and a decent browser and email client and an HTML editor and a movie editor and a DVD player and all the utilities required to actually make XP usable and stable like anti-virus, firewall, registry fixer, etc. you'd probably go more than a gig anyway.
Ubuntu comes with all of that installed.