My mac bro pro does not shows my usb or hard disk?, my mac bro pro does not shows my usb or hard disk?

hey guys help me

Nobody can.  You did not provide any details.  It is very difficult to offer troubleshooting suggestions when the "os version" you are using is unknown as each os has their own troubleshooting solutions. 
Please describe in detail all you have attempted to do in order to resolve the issue. 

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