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Small errors one or two bad symbols per block are generally considered noise. In any case, no quality control program is perfect, and problems can sometimes slip through. Each method is a piece of the quality testing puzzle. The easiest way to measure disc quality, however, is to measure error rates. The C1 stage is used to recover from random errors caused by noise in the signal; the C2 stage is used to recover from larger errors caused by physical defects such as scratches and dirt.
