We carry Panasonic Tought Books in all our trucks. To be honest, I or we, would never look for a flash drive. It has never been brought up as a source for medical info. Most of the time we would be to busy to use the computer. Its second nature to look in a wallet, around the neck, or for a bracelet. Its easier to read. Alot of riders keep it in there wallet and sometimes the wallet is in the saddle bag and we never look through the bike. Something visual is good. Makes it 'medic proof'!

Best bet is a necklace or braclet. Because 99% of the time if you wreck on your bike your gonna be stripped nekkid, and we will notice it. Most can tell your medical history by the meds you are on.
Alot of departments will not have a computer. They are pricey. I think ours were 5-8K a pc. You should be ok in the big cities.
Oss, is in your helmet or outside? Sometimes your helmet my not be removed until you get to the ER. If you have allergies to meds it maybe be to late.