DVD Region 2 - Doctor Who: The Aztecs - Video & DVD

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1. The term "Region 0" also describes DVD players that were designed or modified to incorporate Regions 1–6 simultaneously, thereby providing compatibility with virtually any disc, irrespective of region[s]. This apparent solution was popular in the early days of the DVD format, but studios quickly responded by adjusting discs to refuse to play in such machines. This system is known as "Regional Coding Enhancement" or RCE.

2. A 74-minute (650MB) disc has roughly 333,000 sectors while the 80 minute (700MB) one has approximately 360,000 sectors allowing greater storage. 90 and 99 minute versions follow the same logical extension cramming more sectors at the cost of reliability across drives. Pits are much closer to the label side of a disc, so that defects and dirt on the clear side can be out of focus during playback. Consequently, discs are much easier to ruin by scratching their label side, whereas clear-side scratches can be repaired by refilling them with plastic of similar index of refraction.