Well I have experimented with the USB drive. First I mounted on the Windows box and backed up all of the data to an internal drive. Then I removed the partition off the USB drive. I then mounted the drive on the Mac and went to the "Disk Utility". The mac recognized the drive at this point. I first created two partitions and then realized that after it was formated in HFS, I could change it to FAT32, so what I did was remove both partitions and created one large partition which was HFS which I later converted to FAT32. At this time, I was asked if I wanted to use this drive with "Time Machine". I did not accept the option. I then unmounted the drive from the Mac and mounted it on the WIndows machine. Guess what, Windows did not recognize the drive. When I used Windows "Drive Manager" it should the drive was not configured yet. Since I have three Window boxes that depend on this backup drive and only one Mac machine I opted to reconfigure the drive with NTFS filesystem. I guess I will have to break down and purchase a second USB drive for the Mac. While this may cost me, in the long run I think it is the only safe thing to do. Thank you all for all your help.