Reformat external drive from mac os to windows

the windows partition on my mac book pro is close to full.
i would like to use an external drive formatted for windows for my growing number of pc games (gw,tdu,fsx,dirt - which run great on the mac book pro windows partition btw).
i tried to reformat a mac formatted external drive using disc utility, erase, format volume, but only choices were mac os extended and unix - no fat32, dos, or windows choices.
if i start up my mac book pro using windows, the drive does not show up in the 'hard drives' section of 'my computer'
please let me know how to reformat this mac formatted external drive so i can use it when the mac book pro is running windows.
thanks

Hi Stefan, Turns out my old ext hd was corrupt. Bought a new 300G G-Drive and got a brand new problem which you may have heard of - the dreaded hal.dll crash. My windows partition crashed and after much effort I finally have everything working.
Had to go to the mac store to get a boot camp 1.4 disk (mine was the original) was able to save files from the corrupt windows partition to my mac partition. next i used boot camp to revert to a single partition on my internal drive, saving my mac system and files. next used boot camp to partition the internal drive into big mac and 31G windows. reinstalled windows. next using disk utility i split my 300G external into 10 30G partitions using your GUID suggestion and formatting in ms-dos(fat32) so my mac could read/write to it. dragged the files i saved to the 30G partitions and they work fine. loaded more games into the 30G partitions and they also are working fine.
could not have done it without your pointing out the GUID option.
vielen dank, john

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