For reasons still unclear, [Techmoan] has procured an RCA 8-track changer that holds five tape cartridges in a custom carrier. It somewhat works, but had a bit of mechanical issues here and there ...

Robotic libraries full of tape cartridges have more direct access capability ... To that end, IBM, NCR and RCA introduced magnetic card storage that held more data than RAMAC and were peripherals ...

For reasons still unclear, [Techmoan] has procured an RCA 8-track changer that holds five tape cartridges in a custom carrier. It somewhat works, but had a bit of mechanical issues here and there ...

But most consumers balked at reel-to-reel tape-threading hassles, so tape cartridge formats were developed. When RCA introduced its Sound Tape Cartridge player in 1958, it wasn't exactly compact.