I just got a WD Black 750gig drive to install Win7 on. For XP and what I was think of doing was creating a small say 40 gig partition for just Win7. The second partition would be the rest of the drive an hold all my data and other programs I install. Although after reading http://forum.notebookreview.com/showthread.php?t=442289 I have been thinking about doing it more like that. I small tmp partition, I don't use any program that would need a scratch disk, so maybe 10gigs? Then the OS partition with programs install ie a few games, so 200gigs. The the rest used for data. Do many people do this? Is it worth it? It sounds logical, and that it should help some. Also can Win7 or a free program change the partition sizes later if I find out I picked bad sizes?