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 http://community.wdc.com/t5/External-Drives-for-Mac/WD-My-Book-Elite-Using-on-a-Mac-amp-PC/m-p/92308#M1894

Joe

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

http://wdc.custhelp.com/app/answers/detail/a_id/291/kw/fat+32+format/session/L3RpbWUvMTI5NjA5NDI1Mi9zaWQvbzYyY2w0bGs%3D