Actually, SPDIF/Red Book has inherent error checks built in.
“A common misconception holds that data errors degrade sound quality. As shown later in this article, uncorrectable errors are rare events. However, even if you had a disc with hundreds of uncorrectable errors, those errors wouldn't affect such aspects of sound quality as treble smoothness, soundstage depth, or bass definition. Instead, you would hear a click or discontinuity at the point where the uncorrectable error occurred. The rest of the music would be unaffected. Moreover, there's absolutely no evidence that discs with lower error rates (corrected errors) sound any different from discs with high error rates. Whatever's causing differences in sound quality between CDs isn't data errors.”
In addition, mishandling increases a disc's data errors. A CD's top (label) side is more vulnerable than the bottom, because the pits are impressed on the label side. Scratches or contamination on the bottom surface are out of focus to the laser, and are less likely to cause errors. But...
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