C2 error

A C2 error, also known as E32 error[1], is a read error of a compact disc. C2 errors can to a degree be recovered[2] 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.[3] C2 error correction codes are also used by the Digital Audio Tape (DAT) format.

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.

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

[1]

gollark: Great, it seems fine, apart from what looks like an unclosed database connection (I have no idea how to fix that).
gollark: I'm doing a very scientific test to see if the leaks are caused by my code by seeing if the total memory leak if I run it multiple times is greater.
gollark: Also tons of complaints about uninitialized values but that's *probably* fine!
gollark: Hmm, valgrind says 1152 bytes are "possibly lost". This is troubling.
gollark: I should really come up with my own horrible ISA/assembly language to make people suffer. And actually implement it, unlike PotatoASM.

See also

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