In September 1999, ATRAC3 (132/105/66kbps) audio compression algorithms according to MiniDisc SP Mode (ATRAC 292kbps) developed by Sony. The first Memory Stick portable player "NW-MS7" (MS Walkman) introduction. Next year, MD Walkman supported by MDLP (LP2/LP4) technology recording and playback time up to 160/320 minutes.