CD+G Acceptable Error Rates
The accuracy of the pits is not the issue. If this was the problem, it wouldn't work correctly for regular music cd's or anything else would it? The issue is compatiblitly with the graphics part of the formatting.
Actually, the accuracy is a major issue. Audio CD's have a fairly generous amount of error-correcting code stored on the audio data, to allow players to correct any read errors that occur (and there may be a lot). Data CD's have even more. In addition, a an uncorrected misread on an audio disk will usually result in only a momentary slight audio disturbance, and a misread on a data CD can usually be corrected by trying to read the sector again.
Unfortunately, the CD+G subcode data is stored with little error-correcting code (and some players may not even use that). Further, while an audio misread may cause a glitch of no more than 1/75 second, a misread in the graphics subcode data will cause a glitch to appear on the screen that will remain there until something overwrites it.
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