Glass media made a try back in the late 80`s when HP and others produced HDD`s with lab glass platters. The biggest drawback from this media was "ringing" such as when your case were struck lightly whilst the drive was functioning. The ringing allowed the media to vibrate resulting in a rather catastrophic head crash under certain circumstances.
Metal (aluminum) HDD platters suffer from this but not to the extent of glass.
In CD-ROM applications, it might work better due to it`s "non-contact" method.
I would imagine this media to be very expensive and problematic when reading "plastic" media.
The biggest drawback of "plastic" media is it`s tendency to "grow" due to centrifical force. Plastic media has a "true" limitation of about 5500 RPM before "growth" must be contended with. This would equate to about a "true" 80x drive. Most CD-ROMS use the "CAV" principle where the drive rotational speed varies with the disk access point.
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