According to this Inquirer report, there’s a new kind of CD in town.
A JAPANESE SOUND boffin has come up with a glass CD which he reckons does not warp, distort, and looks and sounds nicer than those nasty plastic creations… He said that plastic CDs were not completely transparent, information on them cannot be read perfectly. They are also susceptible to bending or warping if left in sunlight or humid areas, which leads to sound distortion.
That doesn’t make sense. CDs are digital information, so there’s either data there or there isn’t. You can certainly damage them, but putting your zeros and ones in glass instead of plastic isn’t going to make any difference to the sound quality.