A Double Level Granularity for Multimedia on Demand System

Multimedia on demand, such as VoD and AoD, has popularized with the development of network technology in these years. The storage system of multimedia on demand has some special requirements. A new double level granularity for storage devices is presented in this paper. It integrates the virtues of coarse granularity and fine granularity. It's a good tradeoff between coarse and fine granularity.