I had the same issue with my galaxy note 10.1.
Here's what you do.
Go to the play spite and download an app called USB Host Diagnostics.
Open the app.
Tap "Start Diagnostics"
A file manager app should open
Look for a folder named "USB Drive A"
Open the folder, inside should be the comments of your usb drive.
The downside is that you'll have to use the usb host diagnostics app every time you want to mount your usb drive.
Search for "usb host otg" in the google play store to find other apps that will allow you to mount your usb devices. You'll probably find an app or two that will allow you to mount an external drive to your tablet as easily as mounting an external drive to a pc or a mac. I've seen payed apps that will automatically mount your drives to android devices as soon as you connect it via usb. I'm almost sure that with a little bit of patience, you might be able to find a free app that does the same.
Another alternative is to flash a custom ROM to your tablet that supports usb host. To learned more about flashing custom ROMS on your galaxy note 10.1, do a search for "galaxy note 10.1 xda" and click on the first link you see that says "Android Developement"
I've seen videos on youtube showing guys using other otg cables where it just works like it's supposed to, instead of having to deal with the "high voltage" message.
I bet that our issue is related to using cheap otg cables.
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