Basically miniDVD is a regular CD that has the same structure as regular DVD-Video has. Most of the standalone DVD players can be fooled to think that the disc inserted is a regular DVD-Video disc and to play it. But, one DVD quality movie (about 4GB) ends up taking 6 or more CDs (about 700MB per CD), Therefor most of the people don't use miniDVDs, but use VCDs, SVCDs or their varieties.
