Dual format optical disc
Dual layer optical medium having partially reflecting metal allo
Dual layer optical storage medium having partially...
Dual layer optical storage medium having partially...
Dual substrate optical recording medium
Dual surface optical memory disc
Dual-metal reflective layer recordable/erasable optical media
Dual-stack optical data storage medium and use of such medium
Dye recording medium having read-only area and recordable area
Dye-polymer optical data storage media with improved recording s
Dye-polymer optical data storage media with improved recording s