My thing about a full format and a quick format was...
If you are using a drive for the very FIRST time, I would do a full format just to be safe to be sure there isn't any errors down the drive. After you do it once, quick formats are fine after that.
But... I noticed in Windows 7, when you prepare the drive, you do not have the choice to do a full format, it just prepares (quick formats) the drive.
Mainly up to you. Honestly, just do a quick format and use it. If magically there are any drive errors, it will show up.
Figured if you dont even have the full format options when installing windows 7, then you may as well quick format in windows xp.