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C2 error
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<p>A C2 error, also known as E32 error, is a read error of a <a href="/facts/Compact_disc/g51GRloc">Compact Disc</a>. C2 errors can to a degree be recovered by the hardware <a href="/facts/Error_detection_and_correction/o2rH8e3n">error detection and correction</a> 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 <a href="/facts/Compact_disc/g51GRloc">frames</a>, an improvement over C1 error correction, which analyzed just one frame, resulting in more accurate data correction. C2 error correction codes are also used by the <a href="/facts/Digital_Audio_Tape/n03hG7Jm">Digital Audio Tape</a> (DAT) format. </p><p>Some <a href="/facts/Compact_Disc_and_DVD_copy_protection/eTDzSNoy">copy protection</a> schemes add false C2 errors to discs to discourage copying. </p><p>While causing data loss on <a href="/facts/Video_CD/87gb1XJ5">Video CDs</a> (<i>Mode 2 Form 2</i>) and <a href="/facts/Audio_CD/FDMqNLw5">Audio CDs</a>, individual C2 errors are correctable on data <a href="/facts/CDs/g51GRloc">CDs</a> (using <i>Mode 1</i> and <i>Mode 2 Form 1</i>). </p>