On 12/11/2014 11:24 AM, Rich Alderson wrote: > Evolutionarily, that should be > > wire => metal tape => plastic tape => metal disks => floppy disks > > over more than three decades, right? I think the floppy disk may be older than the oxide-on-metal disk. cf. The Brush BK-501 Mail-A-Voice. Looks like a floppy to me. --Chuck