Let’s Play Video Games are reporting that the Nintendo Switch will support memory expansion via Micro SD card the same as the New Nintendo 3DS. The Nintendo Switch development hardware supports Micro SDXC cards up to 128 GB in size. The publication also reports that Nintendo Switch dock doesn’t support external USB drives like Wii U.
It is currently unclear if this upper limit will be reduced on the retail model, but the development model of the Switch does support running software directly off the Micro SD card as you would off the internal memory or a game cart.
In addition, a source close to the production of the Switch reveal trailer has informed us that the Micro SD slot on the Switch can be located underneath the handheld’s kickstand on the model shown in the reveal trailer.