On net.general today, an odd thing is described in a post titled "digital audio":
"SONY AND PHILIPS AGREE TO DIGITAL AUDIO PLAYBACK FORMAT"
"information encoded on a 4.7 inch diameter disk"
"16 bit PCM"
"Recording time is one hour per side"
An also-ran technology also mentioned in the post is interesting too. It is sort of a flash drive without the flash memory, instead using some kind of film.