The Fostex D Series recorders, introduced in the early 1990s, marked the company’s move into professional digital multitrack recording. Starting with models such as the D-5, D-10, D-20, and later the D-80 and D-90, the series offered high-quality digital tape and hard-disk recorders aimed at studios transitioning from analogue systems. These machines provided 16-bit or 20-bit linear recording, SMPTE and MIDI synchronisation, and precise editing functions in compact, reliable designs. Known for their clarity, stability, and value, the D Series recorders became popular in project and broadcast studios, providing dependable digital recording performance before computer-based systems became standard.