USB 2 external case is not working on my Mac!! please help!

Hi, I have a macbook air OS X 10.7, and I plugged in usb 2 external case for the first time, so i could transfer my files, but somehow, its not working, its like it has been locked and its not doing any action!! please help me!

Do you mean an external HD in an enclosure with USB 2 or a USB stick? In any case, open Disk Utility and make sure it is formatted as OS X Extended (Journaled). You can also Verify and Repair the volume.

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