Common media and technology families include CD, DVD, and Blu-ray Disc. Standalone, non-computer, optical storage devices also exist, for example big man CD players, DVD players, and some DVD recorders, but those are not covered in this article.
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Double layer (DL) announcement have two independent data layers separated by a semi-reflective layer
- Both Cassette to CD Recorder layers are getable from the same side, but beseech the optics to adjustment the laser's focus
- Traditional isolated layer (SL) writable media are produced with a spiral groove molded in the protective polycarbonate layer (not in the data recording layer), to head and synchronize the speed of recording head.