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I have an 500 GB External hard disk. When I plugged it into my friend's laptop, once my work over, then I plugged in my laptop. In MY COMPUTER it doesn't show properly, so, as usual, I plugged out and in again. Then in MY COMPUTER it says the hard disk need to be formatted before you can use it, and I can't access the drive which prompts Access Denied & data REDUNDANCY ERROR.

How can I recover my External HDD & recover my files.

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