At 11:59 4/18/01 -0600, you wrote: > >I have a CD-R (the actual disc), and inside the case is a list of Features > >(e.g. 650MB capacity, etc.) and also "120mm outer diameter, 15mm inner > >diameter" and "1.2mm thickness". > >In addition, it says "1.5m/sec linear velocity" and to cap it all off, > >"Operates in +5ºC to +55ºC". > > > >That is correct; the CD(ROM/RW) etc. was designed as 120 mm. I've heard it described as 12 cm, which makes for a nice parallelism with the LP record. The LP was 12 inches in diameter; the CD, its replacement, is 12 cm in diameter.
