Audio product from the 1990s-can't think of the name?

There was something in the 90s(early 90s,I think) that was supposed to be competition to cds.I believe it was kind of box shaped(kind of like an 8 track) and I guess it failed miserably,I only saw it in Radio Shack once or twice,and within months it was nowhere to be found.Does anyone remember these,and could you tell me what they were called?Thanks in advance!