Re: are USB floppies toxic?

These fail together, I'd call them equally safe. Using an unusual (and small) stack is safer as exploits would be more expensive to obtain. Probably better to airgap by having a secure microkernel (L4, how are you?) do the USB and another protocol (Ethernet for all I care) carry sanitized payload to the actual machine. Think of it as wearing a condom. Whatever the transferred payload is, making sure it's sanitized is vital and non-trivial. Probably would require interpreting and serializing it again, to unify the formatting.