My external hard drive won't work on my new mac

ive just got my mac book pro and was wanting to transfer all my music from my Windows Laptop, i have a Toshiba Stor.e Canvio 500gb which i have put allof my music onto i plugged it into my macbook via usb and nothing seems to happen the mac doesnt show any sign of the HD what so ever, is there anyway i can get this to work ??

Go to Finder Preferences and make sure external disks is ckecked.

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