I have a USB OTG cable from when I had a HTC EVO, which never really worked on that phone. The cable works flawlessly on the Galaxy Tab Pro 8.4
I tested it using a 16GB USB Flash Drive and a USB-powered 250GB 2.5" hard drive, and there was enough power supplied to browse and run videos. I haven't tested it extensively if it cuts out after a while or whatever, but from my usage, it seemed to work great.
I just ordered one of these from amazon, do you know if you can plug in a game controller with it on the tab?
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