NW-MS77DR

The NW-MS77DR is a third-generation Memory Stick Walkman that integrated 256MB of built-in flash memory with Memory Stick Duo support. It handled ATRAC, ATRAC3, and ATRAC3plus formats on its backlit LCD screen and added direct recording capability through a USB cradle, alongside gapless playback and Virtual Mobile Engine. It exemplified the third-generation hybrid design that blended internal storage with removable media expansion.

This player shows Sony trying to expand the category without abandoning its original architecture. Like the other later MS models, it blended internal flash with Memory Stick Duo expansion, but it also added direct recording through its cradle, pushing the player slightly closer to Sony's older portable audio instincts instead of treating it as playback-only. It was one of the more transitional side branches in the family.