Optical discs for laser reading systems, unrecorded, of a recording capacity > 900 megabytes but < 18 gigabytes, nonerasable "dvd/rs"
Optical discs for laser reading systems, unrecorded, of a recording capacity < 900 megabytes, nonerasable "cdrs"
Optical media, unrecorded, for the recording of sound or of other phenomena "e.g. cdrws, dvd/rws, dvdrams, minidiscs" (excl. nonerasable discs for laser reading systems of a recording capacity < 18 gigabytes [cdrs, dvd/rs] and goods of chapter 37)