DVD Quality, “Strategies and Measurements”
http://www.lightbyte.com/DVD_Sector_2.doc

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PO Failures (POF)

An outer parity failure represents the loss of data on a DVD disc. However, most DVD players will expand their data matrix and retry an uncorrectable ECC before tagging it as a lost piece of information. Our analyzer will record all passes on PO failures. If the analyzer is setup up in single pass mode the unrecoverable error will match PO failures in position. If the analyzer is run in single step mode we may find outer parity failures that do not result in unrecoverable data...