[EE]: 500 MB magneto optical disks about size of US 25 cent coin.
11 hours of music.
Applications also in digital cameras etc
Sounds like only write-once capability.

        http://www.zdnet.com/products/stories/reviews/0,4161,2860474,00.html

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.