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PIF - Parity Inner Code Fail
The PIF signal or parity inner code first level fail is a continuously measured value, reported for every megabyte. PIF is the number of rows within an ECC Block with too many bad bytes to allow error correction. All bytes in the row are marked bad.

Such errors can be caused by all optical defects that interfere with the normal data read-out procedure (scratches, dots, black spots, bubbles, etc). Local defects can cause the data contents to deteriorate Others causes can be jitter problems, stamper defects or a bad HF signal.

The signal is not specified in the DVD Book.

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