Can WD Passport Essentail be used for PC and MAC?

WD External Drives External Drives for Mac
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I have a similar issue.  My passport SE worked fine on Windows and Leopard, could use on work pc (Windows) and my home Macbook Pro without any issue.  I then “upgraded” the Macbook to Lion and can no longer access the passport SE portable drive.  Is there a “work around” so I can still use the same portable drive on both systems?  Geoff