Hi all, I'd like to have an external hard drive that will work on both Mac and Windows units, and I know that I can do that in the formatting of the drive. I'd also like to be able to make use of Time Machine. If I have a drive that is formatted in this way, can I still use Time Machine on the same drive, or will I need two separate drives? A followup question...can I run Time Machine on two different Macs on the same drive? What's my easiest solution to do everything I'd like to do? Thanks!