In 2004, data transfer and PC connectivity functions reached a practical level. Music management has been shifted to a software-centric structure.
NW-HD1
The NW-HD1 is the first Network Walkman to feature a built-in hard drive. It has a 20GB HDD and supports audio playback in ATRAC, ATRAC3, and ATRAC3plus formats. It features a backlit LCD display, shock resistance, and an accelerometer. This device employs a self-contained configuration using a built-in hard drive, allowing for the portability of large music libraries. It relies on music transfer via PC software and is dependent on the ATRAC format. It is positioned as a high-capacity-oriented model, distinct from flash memory models.
NW-HD2
The NW-HD2 is a model part of the first generation of Network Walkman with a hard disk drive. It has a 20GB HDD and supports audio playback in ATRAC, ATRAC3, and ATRAC3plus formats. It features a backlit LCD display and is equipped with a shock-resistant mechanism and an accelerometer.
NW-HD3
The NW-HD3 is a later model of the first-generation Network Walkman equipped with a hard disk drive. It features a 20GB HDD and supports audio playback in ATRAC, ATRAC3, ATRAC3plus, and MP3 formats. It has an LCD display and is equipped with a shock-resistant mechanism and an accelerometer.
NW-E75
The NW-E75 is a 256MB Network Walkman part of the third-generation E series. It features built-in flash memory and supports audio playback in ATRAC and MP3 formats. It has an LCD display and is configured for long-term operation with a single AA battery.
NW-MS77DR
The NW-MS77DR is a third-generation Memory Stick Walkman that supports built-in flash memory and Memory Stick Duo expansion. It has 256MB 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.
NW-E95
The NW-E95 is a 512MB capacity Network Walkman part of the third-generation E series. It features built-in flash memory and supports audio playback in ATRAC and MP3 formats. It has an LCD display and is configured for long-term operation with a single AA battery.
NW-E99
The NW-E99 is a Network Walkman with 1GB of built-in flash memory. It consists of two 512MB memory modules and supports MP3 audio playback. It features an LCD display and supports long battery life with a single AA battery. Its self-contained configuration with built-in flash memory eliminates the need for external media. It is designed for music transfer via PC software and supports the MP3 format. Positioned as a high-capacity model within the series, it features an expanded configuration compared to the basic specifications of the same generation.
By 2004, software had been incorporated as a core element of the product structure. This structure was continuously applied to subsequent product designs.
