160gb ext harddrive windows nt format. want to use on me g4
 

just bought a secondhand maxtor 160gb harddrive for use with my g4. really dont want to loose everything. so maybe being a little cautious. when i control and click on the device on my desktop and get info. it tells me its window nt format. is there a way to reformat this. tried disk utility but will not erase? any clues