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2. Comparison of popular optical data-storage systems - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_popular...

   It was resolved with both surviving however: DVD-R predominating for stand-alone DVD recorders and players, and (for computers) most DVD devices being engineered as dual format, to be compatible with both. As of 2007 DVD is the de facto standard for pre-recorded movies, and popular storage of data beyond the capacity of CD.

3. Comparison of high-definition optical disc formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_high...

   Comparison of various optical storage media. This article compares the technical specifications of multiple high-definition formats, including HD DVD and Blu-ray Disc; two mutually incompatible, high-definition optical disc formats that, beginning in 2006, attempted to improve upon and eventually replace the DVD standard.

4. Optical disc drive - Wikipedia

   en.wikipedia.org/wiki/Optical_disc_drive

   Most optical drives are backward compatible with their ancestors up to CD, although this is not required by standards. Compared to a CD's 1.2 mm layer of polycarbonate, a DVD's laser beam only has to penetrate 0.6 mm in order to reach the recording surface. This allows a DVD drive to focus the beam on a smaller spot size and to read smaller pits.

5. Optical storage media writing and reading speed - Wikipedia

   en.wikipedia.org/wiki/Optical_storage_media...

   CD drives and many early DVD drives stored data with constant linear velocity, so that the data rate remained the same regardless of the position of the optical head. Modern DVD drives use constant angular velocity to allow transferring data at the highest supported physical rotation speed and/or random access without needing to adjust the ...

6. Optical disc - Wikipedia

   en.wikipedia.org/wiki/Optical_disc

   However, not all optical drives provide this capability, and support for this feature can vary significantly between manufacturers and drive models. On drives lacking raw data access, users may rely on a less precise method: monitoring unexpected reductions in read speed, though this is a far less reliable indicator of disc health.

7. DVD recordable - Wikipedia

   en.wikipedia.org/wiki/DVD_recordable

   On dual-layer media, half-height optical drives released towards 2010, such as the 2007 TSSTcorp TS-H653B, [41] have adapted recording speeds of up to 16× on DVD+R DL media by selected vendors, compared to up to 12× on DVD-R DL. More recent optical drives have reduced their maximum allowable recording speed on both +R DL and -R DL media to 8 ...