Can I tranfer between Windows 7 and Mac OS with My Book Essential?

I was trying to transfer from a Mac to my Windows 7 formatted My Book Essential today and got an error message (I don’t remember the exact message, all I can remember it was implying that the files could not be moved to the My Book). Do I need to format it for the Mac or download some drivers for it? I don’t have the original CD that came with the My Book Essential so I would like to know some alternatives. Thanks.

It should be formatted NTFS for Windows then on Mc download NTFS-3G  Look aat post 6


here is the instructions on how to format for mac and pc