Released in 1982, the Sony WM-DD was a Walkman designed to combine portability with high-quality sound through Sony’s newly developed “Disc Drive” mechanism. Instead of a conventional belt drive, motor rotation was transmitted to the capstan through a disc-based mechanism, providing stable tape transport and low wow and flutter.

Its compact metal body featured Dolby B noise reduction and support for Metal tapes, establishing the foundation of Sony’s sound-focused DD series. The premium exterior was offered in finishes including champagne gold. The DD line later developed through models such as the WM-DDII and WM-DDIII, and in 1986 Sony introduced the high-end WM-DD100 “Boodo Khan.” Based on the fundamental DD mechanism pioneered by the WM-DD, it pushed portable cassette playback toward genuine Hi-Fi performance. The WM-DD therefore represents an important stage in the pursuit of high-fidelity sound within the Walkman series.