While the LP revival is still in full swing you rarely hear about the other 12-inch, grooved vinyl record format, the RCA VideoDisc.
It was a grooved, carbon-loaded PVC disc. The grooves were 48 times smaller than an LP groove, but they were still tracked with a diamond "needle"! That was possible because unlike an LP's zigzag grooves the CED's grooves were hills and dales. That difference also minimized groove wear, so the discs could be played hundreds of times. VHS and Beta tapes would wear out faster than that. The VideoDisc also had stereo soundtracks.… Read more