I bought one of these for myself to test a few and was so impressed. You can copy files to and from your flash drive all from your Android phone! *You can connect usb keyboards and mice as well. This little cable has changed the way I use my S3 and will change the way you think of your Android phone or tablet as well.
Sale price: $1200
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Was asked to provide more clarity on devices which are compatible...view the link below
*How To Use USB Drives With the Nexus 7 and Other Android Devices - How-To Geek
This is a general guide specific to the Nexus 7 and requires the device be rooted, but is also applicable to other devices as well.
https://play.google.com/store/apps/d...ususb.importer
The app above does the same thing without requiring root access