Dual Boot Question

[Tommy Trauma]

I've got a brand new 300 gig raptor sitting here, and Vista64 w/sp1 Ultimate due in today that I want to do a dual boot for vista and my XPPro32/sp2 with. I've had a helluva time trying to install XP pro with AHCI enabled in the bios (never did get it to work) to run in SATA mode. I got a good deal on vista through a student discount. Is this a defintive guide on how to do it, or is there any known better ways to do this? Is there a suggested partition size for vista ultimate? I was going to make it 80 gig, and the next partition for XP at 30 gig. I always make seperate partitions for my programs and another for my games. I need to keep XP Pro on for a while for one 32 bit program that doesnt have 64 bit support yet. Any advice or suggestions will be appreciated.

Thanks
T.T.

http://apcmag.com/how_to_dual_boot_v...ide.htm?page=1

or this one instead.

http://www.pronetworks.org/forums/re...ta-t88193.html

..edit... Also have two 200gig seagates I will hook up after the installs on the raptor and use just for storage.


Specs:
i7-940 3838A611@3750mhz
True Black 120 lapped/Kaze3000
EVGA X58/SZ1G
OCZ 3G1600LV2G
Corsair CMPSU-1000HX A
1-300gig WD Raptor
2-200gig Seagate Sata's
eVGA GTX295 182.06
Audigy2 Platinum
LG22x DVD burner
XP Pro32 bit/sp3
Antec 1200/lots o' fans
Dell 2407hpc

[doakh]

I use Vista Home Premium x64 in a 100GB partition (64k cluster). 60Gb is being used, but I do not separate my application and documents into another partition.