I buried this question in another thread. Luckily, it had no bites, lest I be accused of attempting to “hijack” it.
I’ve never seen a CED disk or player, but IIRC it was RCA’s entry into the “disk” market.
Laser disks were already available in the early '80’s, but they and the players were very expensive.
CED would theoretically have been a cheaper alternative, although they never caught on.
I think it actually used a liner track stylus.
Or did I just dream this all up?