D-777

With the D-777, Sony expanded its skip-protection system by increasing the amount of audio stored in memory and reading the disc at higher speeds to maintain that reserve. Earlier Discman models held only a few seconds of audio, but this revised approach provided a longer recovery window and reduced sensitivity to vibration during movement.

The stronger buffering system allowed Sony to build the unit around a thinner, carbon-reinforced shell measuring 19.8 millimeters in depth. The layout centered on efficiency, with the faster read mechanism and buffer working together to keep playback steady during walking or commuting.

Controls sat along the front panel, and the display handled basic track and playback information. Audio behavior followed the tuning used across Sony's mid-nineties portables.

Output stayed clear at normal listening levels, dynamics were stable, and Mega Bass offered an optional low-frequency lift. It made portable CD usable in motion without compromise.