8 track tape
The 8-track had many problems. Unlike cassettes, the rubber roller was in the cartridge. It would often wear out, or chemically break down. This could cause a gooey substance in the tapes. This happened faster if the cartridge was left in a hot car. This also caused the tapes to wear out quickly. The spacing between the tracks were very narrow. Music from tracks other than the one being played could often be heard. The sensing foil in the tape would sometimes break off. This would stop the tape from changing tracks.