|I'm not sure how XP will set up the drive letter on that drive. What you don't want is for it to change the drive letters you already have.|
You should be able to set up a boot loader and choose which drive to boot from using a boot menu. Or you can set the XP drive type to NONE in cmos/bios setup whenever you want to boot from the 98 drive.
Unlike XP, 98 will run if you attach a 98 drive to a different motherboard. But you need to make sure 98 drivers are available for the motherboard and whatever cards you have installed--video, audio, etc.
If drivers are available and you want to go ahead and attach the 98 drive there's a few things you can do to make the transition easier. Check my # 2 here:
and my # 6 here:
for a continuation. That's was a question about ME. It's the same for 98 except the folder you want to copy from the 98 cd is WIN98.
Real men don't use AntiVirus; they just reformat