Formatting NFTS to FAT32

Dunno if I should start a new topic with this - but I purchased a MyBook Mirror Edition 2Tb (2x1Tb) drive.  I want to be able to SHARE data between my XP laptop and iMac and I want it set to Raid1 (mirror) as I’m using it as a work drive and want the instant redundancy.

The Mirrored drive was reformatted Fat32 off a Mac and … you guessed it, XP recognizes it but it won’t assign a drive letter or browse the drive.  After MUCH googling I’ve determined that I have to reformat Fat 32 on the XP machine. 

BUT - how do I do that and keep the drive’s mirrored setting?  The Disk and Raid manager utilities in the mac version gave an option for Fat32, but the windows one doesn’t.  If I format it using Windows, won’t it just give me a 2Tb Fat32 drive?

To restate my question - What’s the process to set up a RAID1 (mirrored), FAT32  drive under Windows XP?

TIA,

John