Usb not working on macbook pro retina

hi
my usb flash drive not showing up in my macbook but when i bought the laptop it used work . but now its not working.
its working in my windows laptop.

Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Best.

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