Is there a compatibility issue with the Current USB 3 external Hard drives and MacBook Pro 2011 (USB 2)?

I am currently having bad hangs with my 13" MacBook Pro (2011) which I book 2012 ad a New external Harddrive (WD My Passport Edge) which was given to me as a gift.
Friends of mine told me there is a compatibility issue between the USB 3 cord and the USB outlet of my MacBook Pro.
Although this shouldnt be the case as the box of the Hard drive I got said it was compatible.
I even downloaded the WD Drive Utilities and sometimes whenthe Harddrive is plugged in the Utilities doean't Open but just bleeps in the Applications Dock.
Before I used the Harddrive I read a lot from the WD Manual and went to their site and downloaded a firmware update so I really don't know what the problem is.
What I am afraid of is that I may lose some files if I place them in the external Harddrive.
Can anyone help me with this or should I be asking for a replacement harddrive?
This is my first experience with an external hard drive as I never used one before.
Thank you very much.

To be honest, I've had back luck with Western Digital drives and I avoid them at all costs. If I were you, I would return the WD drive and look at externals from OWC or MacMall (LaCie, even G-Tech).
That's just my personal opinion, mind you...
Clinton

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