TheDifferenceBetweenType-RAndType-S

FeatureEnhanced Playback (decoding)Enhanced Recording (encoding)Enhanced playback present in non-Type-R unitEnhanced playback present in Type-R unitEnhanced playback present in Type-S unitNotes
Type-RNoYes (SP, LP2 and LP4)n/an/an/aMore about Type-R from the MiniDisc FAQ Technical details about Type-R Type-R is a similar idea to the Superbit DVD concept.
Type-SLP2 and LP4 onlyYes (SP, LP2 and LP4)NoNoYesType-S includes the Type-R feature. More about Type-S