D-CJ01

The D-CJ01 marked Sony's first serious push to make MP3 playback on CD-R a practical everyday feature. It handled both standard audio CDs and MP3 discs with ID3 tag support, used aggressive buffering to reduce disc spin, and delivered extended playback times on standard batteries in a straightforward, utilitarian body.

This model arrives right at the point when listening habits had already started to shift. The D-CJ01 is part of the transition where portable CD adapted to file-based music instead of resisting it, acting as a bridge between physical media and the early digital ecosystem.