I tested it a little further and was also able to write files to the drive (from Mac) and read them on the Windows machine. Writing the files from the Mac did cause some extra files to be written other then the .DS_Store (some kind of shortcut to the files I was writing), but the files were readable from Windows.
I did some further testing. My Mac can read a FAT32 Partionion (did not test FAT16). It will not read an NTFS partition. Writing to the drive from the Mac did not currupt any of the existing data but did create extra files.
Good information for anyone switching from Windows to Mac.

