Hello and thank you for your question today. My name isXXXXX look forward to helping you today. You can format it as a NTFS partition. It will be readable on the PC with no problem.
In order to make it readable on the Mac, you can install the free NTFS utility on the Mac, found here: http://www.macupdate.com/app/mac/24481/ntfs-3g/
I look forward to your next message or your rating below.
Thank you again, - Jason