Origin of "partition" in storage devices

On Tuesday (02/01/2022 at 01:41PM -0500), Chris Zach via cctalk wrote: Yes! My dad did some of the first work on LaserDiscs-- built 3Ms plant for making them in the late 70s. As a result, we always had "samples" from the production line to watch at home and numerous different players to check out. CAV allowed you to freeze frame, step forward and back and never loose frame sync. You had a solid picture no matter whether it was playing, stepping or paused. But, you also got at most about 30 mins / side on a disc and so a movie was 3 or 4 discs in length. With CLV, you got more on the disc, about an hour per side or a whole movie on one disc but you could not smoothly pause or step it. Some players would completely disallow it and some would display the torn image with pieces from multiple adjacent frames. CAV was used a lot for educational discs where the player was controlled by a computer (in one case we had, a Sony CP/M machine) which combined the interactive educational software on the computer with video content on the disc. The Sony computer had a genlock system in it so that it could overlay computer graphics on the video signal from the disc player. This was 1979 or 1980 if I remember correctly. Chris -- Chris Elmquist