D-CJ501

The D-CJ501 continued that direction with improved folder navigation and playback logic better suited to MP3 collections, while keeping compatibility with standard audio CDs. It combined G-Protection, practical battery life, and a slightly larger body that made file-based interaction easier to manage.

What defines it is how normal that shift feels. The D-CJ501 is part of the stage where compressed audio on optical discs had already become an expected extension of the format instead of a separate experiment.