How hard would it be to scratch a trace or two off a USB drive to render it read-only and protect the chip from BadBIOS-style flashing? I think USB floppy is just separating the storage from the drivers, but ultimately changes nothing. On 29 October 2014 14:56:41 GMT+00:00, Eugen Leitl wrote: We know USB flash is is Biosafety 4, what about other sneaker-net suitable storage media? USB floppies are still around, as well as media, which are write-protectable. How easy to hop the air gap with these? -- Sent from my Android device with K-9 Mail. Please excuse my brevity.