My external HDD doesn't works on Macbook Pro ML

Hi,
my external HDD works on Windows and Macbook SL, doesn't with Macbook Pro ML.
I can't see it in Disk Utility.
Can someone help me or suggest what I have to do?
Thanks
daniele
IT

Based on what you have said, I do not have an answer for you.  The obvious difference is the OS, but I find it difficult to believe that would be the problem. 
Do you have another HDD to attach to the MBP?  That seems to be my last arrow in my quiver.
Ciao.

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