Originally Posted by Quantumrabbit
I'm not sure how that would affect data transfer speed... Charge speed, sure. Data transfer speed though...
I ended up just popping the files on the internal of the gs3 and copying them to the computer, then to the sd card while in the gs3. Then just put the sd card into the g3, where it read fine.
Because your phone is not usb 3 and requires a 1 amp charger for faster charging speeds. USB 3 VERY RARELY has 1A ports, they are usually between 500-700mA which means when you plug your phone into the computer you aren't getting the full amperage needed to fully charge speed at capacity. Combine those two issues and you get the error you get about plugging the phone into a higher speed port. If you are having problems with transfer speeds being that slow, either your phone, cable or port are borked. Try reinstalling/updating your USB drivers, try new cable or check a different phone with the same USB power requirements if you want to test where the problem is but you will NEVER get USB 3 speeds because you do not have a USB 3 port on your phone, you have USB 2.0 HS