Partitioning additional HD

[glock115]

I have a mac pro with 4 hard drives, the first HD is just for the mac os, drive 2 is an additional 400 gigs for the mac.
Xp is installed, through boot camp on HD 3 and the 4th hard drive was a secondary hard drive taken out of an xp machine.

I would like to create a fat32 partition on my 4th hd and use that to share my itunes library in both operating systems.
However, when I open up partition magic it reports discs 1,2,3 as bad and recognizes disc 4 as NTFS.
I have attempted to add the fat 32 on disc 4 but it fails to do so and locks up upon reboot.
I am new to this and any help would be greatly appreciated.
TIA

 

[killmoms]

You can easily make a FAT32 partition in OS X's Disk Utility, last I looked. Why not just use that?

 

[glock115]

Can I do that while maintaining the existing data on the hd.
I have about 90 gigs of data that I would like to keep if possible.