[G4] External HD Formatting Question

[Ron Michael]

I have a Mac G4 1.35mhz mirror door. Bought a new USB external hard 
drive enclosure with a Maxtor 160HD in it. When I initialized it 
originally I was on my Mac so it's formatted as a Mac journaled. I 
wanted to use this as a plug and play on my Mac and my Win XP laptop. 
Now it's full of stuff and my Win XP won't recognize it. Shouldn't my 
Windows machine see it anyway? Forgive me for throwing in a Windows 
question here please, but it's really a Mac G4 question, too. Any ideas 
on how to correct this?
Thanks.
Ron in Memphis