It has been reported that the Nintendo Switch has a USB-C port. This would be a new approach, as Nintendo have used proprietary charges with the Wii U and all handhelds since the Gameboy Advance SP.
It has also been claimed that the dock’s USB ports will not support external hard drives. This makes sense, since supporting external memory on the dock would set up situations where some content stored on the dock wouldn’t be available when the Switch is used portably. Instead, sources say the console will support Micro SDXC cards, which can potentially store up to 128GB of data.
This information comes from LetsPlayVideoGames.com, who say they have a source at Nintendo and one involved in the production of the Switch reveal trailer. It is important to remember that none of this had been confirmed yet, but it is worth thinking about the benefits and drawbacks if the information is true.