swap file in xp pro

xp pro allows settings on the swap file. I was told, if I move it to another physical drive, performance will improve. I have tried this with no success. xp recreates the file on the drive xp is installed on even when I set the min for 2 on that drive and the remainder on another physical drive. How do I set the min of 2MB on the drive xp is installed on and 768MB on another physical drive, and xp use the settings?