> Which is why secure systems should not have USB sockets. Or CD drives.

I just the other week discovered that the DVD drive on my desktop machine won't play audio CDs: it grinds awhile, then spins down. When I looked inside, there's no audio cable, and nowhere obvious to connect one. Presumably leaving out the necessary internal software (coding, zoning etc) saves a bit of money, possibly on licence fees.

That'd be a bugger for people who wish to relieve the monotony in clean rooms (or secure zones) by bringing in their favourite greatest-hits CDs.