Series
List of offical walkman series, familiesDD
by: SonyDisc Drive series, requiring no belt between the motor to drive the capstan for extremely stable playback speed and thus low wow & flutter values. Only one Walkman ever made had 2 disc driven capstans: the WM-DD9.
DD
by: PanasonicDirect Drive series, the motor axis is the capstan for very stable playback speed and thus low wow & flutter values. Common on high-end cassette decks, very rare on Walkmans as only 3 were ever made, only by Panasonic.
Soundabout
by: SonySony first called their walkmans Stowaway in the UK, the Freestyle in Australia, and the Soundabout in the U.S. — but eventually it would become known everywhere as the Walkman.
Wireless
by: SonyWireless series. Able to use with Wireless Headphones with the appropriate receiver.

World Way
by: PanasonicThe smallest and lightest walkmans in the world at that time.