TheDifferenceBetweenType-RAndType-S

Feature	Enhanced Playback (decoding)	Enhanced Recording (encoding)	Enhanced playback present in non-Type-R unit	Enhanced playback present in Type-R unit	Enhanced playback present in Type-S unit	Notes
Type-R	No	Yes (SP, LP2 and LP4)	n/a	n/a	n/a	More about Type-R from the MiniDisc FAQ Technical details about Type-R Type-R is a similar idea to the Superbit DVD concept.
Type-S	LP2 and LP4 only	Yes (SP, LP2 and LP4)	No	No	Yes	Type-S includes the Type-R feature. More about Type-S