In 2003, the menu and playlist functions were expanded. As hardware became smaller, the importance of software functionality increased.
NW-MS70D
The NW-MS70D is a Memory Stick Walkman equipped with built-in flash memory. It has 256MB of internal storage and supports expansion with Memory Stick Duo. It supports audio playback in ATRAC, ATRAC3, and ATRAC3plus formats and has a backlit LCD display.
NW-MS90D
The NW-MS90D is a third-generation Memory Stick Walkman that supports built-in flash memory and Memory Stick Duo expansion. It has 512MB of built-in storage and supports audio playback in ATRAC, ATRAC3, and ATRAC3plus formats. It has a backlit LCD display that can display playback information.
In 2003, the operating system for digital music playback was established. This means the structure has moved to the practical application stage.
