Sony's history of media formats and devices is fascinating. I keep thinking that at some stage they're going to stop creating new ones, but somehow never seems to happen.

This goes into just 6 of the media formats, but there are so many more.

https://www.slashgear.com/1675900/discontinued-sony-formats-...

A more recent example: Archival Disc https://en.wikipedia.org/wiki/Archival_Disc