Finder doesn't show usb drives

I have a 2012 macbook pro retina
Since a week ago, finder doesn't show usb drives. Any one have an advice please ?
I have tried:
1. Diferents USB (FAT/MAC format) in diferent usb ports of the macbook, didn't work
2. Relaunch finder, didn't work
3. Turn off the computer more than an hour, didn't work
4. Repair HD permissions, didn't work
The disk utility app shows all the usb drives, but finder doesn't
Help please !!!!!

Did you go into your finder preferences and click the sidebar and make sure External disks has a check mark. 

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