Originally posted by: ricochet
I think it makes more sense to have 2 partition of equal size (150gig each), but that's just me. Large partitions take much longer to defrag.
I'm assuming you have XP with SP2 already on the CD. If not, I would create a slipstreamed XP CD. Look it up via google.
If you decide to dual boot:
1. Create 2 partition: 1 primary (c drive) and 1 logical (d drive).
2. Format the logical (d) drive and install XP. Of course XP will automatically put some files on drive (c) as well.
3. After installation of XP is complete, boot off the RC2 disc and install the new OS on the primary (c) drive. It will give you some warning about moving your old windows on c: to windows.old, but you don't have to worry since yours is on d. Just continue.
If you decide to install XP on the primary (c drive) and RC2 on the logical (d drive), it will work as well without giving you the warning mentioned in instruction 3. But you'll find out that when you boot into Vista, the logical drive you thought was drive d is labelled as drive c and the drive you installed XP on will be labelled drive d. When you boot into XP, however, things are back to normal with the drive letters flip-flopped. This is no big deal to some, but for me I'd rather have the drive letters to remain consistent and used the method above.