Why wont my USB flash drive work on my MAC?

I have a partitioned hardrive on the new macbook (chrome). It works on the PC section of my computer, but when i switch over to the mac side, it doest show up. Here is the USB drive i have:

http://www.ecost.com/Detail/Flash+Drive/OCZ+Technology/OCZUSBR2DC-8GB/41152094.aspx?navid=155441533

it even says it should work with macs…
Are you saying no matter what i would have to use two flash drives? one for windows, and one for mac? I’m looking for a flash drive that lets me transfer stuff between the two.

When you first plugged in the usb into windows, the drive formats to win.
So then when you put it into a mac, the mac will not recognize the win format.

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