2007 NW-A808
The NW-A808 is the Network Walkman with the largest flash memory capacity part of the second-generation A series.
2008
NW-S639F
The NW-S639F is the largest capacity Network Walkman part of the 6th generation S series. It features 16GB of built-in flash memory and supports audio playback in MP3, WMA, AAC, and WAV formats. It has a 240x320 LCD display and is powered by a lithium-ion battery.
