My mac isn't detecting my external hard drive (LACIE). Please help!

I've got all my important file in it I urgently need and I cannot open my Lacie external hard drive on my Macbook pro. I tried putting it on to a Window's laptop and it works but not on the mac.
How can I check if there's a problem with the mac or my external hard drive? How would I fix it..

Thanks for answerin my Q, sorry if I don't answer all your Q, im not really a computer expert
The hard drive does not have an extra power suply so I guess it's bus powered. Also Im not sure if the drive is formatted in MAC OS. I've been using this same external hard drive for the last 2 month and I dont know if this could be the problem but 2 days ago my friend plugged this hard drive in to his 24inche imac to put a file in. I went home and when I try to put the hard drive in to my macbook pro it didn't detect anything. It still works on windows though.

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My mac isn't detecting my external hard drive (LACIE). Please help!

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