Fittingly, the example subject is another Arduino Nano. Skip ahead to 32:22 in the video below to see the final result. We’ve seen similar projects, of course. You can build for tiny subjects.

Stacking GPS, GSM, And An SD Card Into An Arduino Shield 18 Comments by: Brian Benchoff October 19, 2012 ...

Overview USB2SD is a USB-to-SD card library for Arduino (UNO, Nano, Mega) that enables mounting an SD card connected to an Arduino as a removable media device on a PC via Serial communication.