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They ARE Mini-DVDs and have ~1.5GB of data as a opposed to 4.7GB for a regular DVD. As GC discs are small (8cm diameter), the laser does not have to travel very far, and as a result, you don't have loading times of other CD/DVD based systems.
GC Mini-DVDs cannot be read by a PC drive (Nintendo did this a a piracy measure). The GC disk drive does not spin backwards.
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