How can I use an external USB drive on my Macmini with Boot Camp and Lion/Windows 7?

I have a MacMini (Last model with a disk drive). The Mini has Lion and Windows 7 installed using Boot Camp. I want to attach a 350GB, USB, HP Personal Storage Device (Hard Drive) to the computer and be able to use it in both Lion and Windows 7 mode. The USB drive is formatted for Windows 7. I only want to use it for storage and back-up purposes for both operating systems. It would be nice if I could access the total disk from either system without having to reboot to change operating systems to view Windows 7 files and reboot again to view Lion files. Can anyone offer any guidance or any informational websites to help me? Thank you for any help!!

Yes, you’ll be able to do that.
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