How do i recover files from an external hard drive when it says it needs formatting

GOKU0000

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Aug 2, 2014
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I have an Imation's i-Por Metal 2.5″ Portable 1TB hard drive. One day, when i connected it to my PC, it worked the first time, then it got disconnected. But when i connected it back, i can't access the hard drive and it ask me to format it. I also tried accessing it on another computer and it didn't work as well. How do i get my files back?