C2 error

A C2 error is a read error of a Compact Disc. C2 errors can to a degree be recovered[1] by the hardware error detection and correction scheme. A CD drive can have extraction errors when the data on the disc is not readable due to scratches or smudges. The drive can compensate by supplying a "best guess" of what the missing data was, then supplying the missing data. C2 error correction is an analysis over many interleaved frames, an improvement over C1 error correction, which analyzed just one frame, resulting in more accurate data correction.[2] C2 error correction codes are also used by the Digital Audio Tape (DAT) format. C2 errors can cause problems for CD rippers when copying CD-Audio discs, and specialized software exists to overcome this problem, such as Exact Audio Copy.

Some copy protection schemes add false C2 errors to discs to discourage copying.

While causing data loss on Video CDs (Mode 2 Form 2) and Audio CDs, individual C2 errors are correctable on data CDs (using Mode 1 and Mode 2 Form 1).

Measurement

Main article: Compact disc § Measurement

C2 errors can be measured using surface error scanning, and are usually caused by scratches and dirt on the data surface, as well as media degradation.[3]

Error scanning functionality and support varies among vendors and models of optical disc drives.[3]

See also

References

  1. ^ Bob Speer. "Explaining Common CD Errors". Archived from the original on 2018-02-08.
  2. ^ Decker, Logan (2002). "How To Make MP3s Like A Master Audio Technician". Maximum PC (Winter ed.).
  3. ^ a b "QPxTool glossary". qpxtool.sourceforge.io. QPxTool. 2008-08-01. Archived from the original on 2021-08-01. Retrieved 22 July 2020.
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