The USB/flash drive devices would be much more practical for storing data that might be needed after being evacuated than they will ever be for an emergent medical situation.

I'm with Pete, if I have an unresponsive patient the last thing I'm gonna do is start looking for their flash drive to see if it can diagnose the problem for me.

You're gonna get appropriate treatment on the scene and if warranted, you'll be getting a ride to the hospital where you can show off your thumb drives, your BIOS, your tattoos, your cell phone, your whatever to your heart's content.