This is Side A of the National Disc, although, as with the Community Disc, the actual contents written onto the disc surface are those of side B. You may notice that the disc surface looks different to the Community Disc. This is because side B of the National Disc contains CLV data instead of CAV.

I can't really tell you much about the differences between CAV and CLV except that CAV discs are encoded in frames at 25 frames per second and CLV discs are encoded in minutes and seconds. A CLV encoded disc surface can hold about a hour of video; on CAV the total is about 35 or 40 minutes.

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