XP & Raptor installation

Hi guys
Can anyone give me advise as to this heres my specs first:
my computer is a p4 ddr 3200 2048mb ram/ radeon 9600xt card 3 drives -80gb/ 120gb/ 80gb raptor drive 450 watt power supply 6 fans. The question is this i have my FS9 on my E drive which is the raptor drive but i have my windows xp on the 80gb A drive but when my A drive gets full say 5gb left of space my FS9 runs terribly slow even though its on a raptor drive all by itself . Am i wasting a drive and should the FS9 and windows be on the same drive.
Hope the above makes sence any technical advise would help
cheers FLYINGBART
Can anyone give me advise as to this heres my specs first:
my computer is a p4 ddr 3200 2048mb ram/ radeon 9600xt card 3 drives -80gb/ 120gb/ 80gb raptor drive 450 watt power supply 6 fans. The question is this i have my FS9 on my E drive which is the raptor drive but i have my windows xp on the 80gb A drive but when my A drive gets full say 5gb left of space my FS9 runs terribly slow even though its on a raptor drive all by itself . Am i wasting a drive and should the FS9 and windows be on the same drive.

cheers FLYINGBART