Hard Disk Drive for HD Quality Multimedia Home Appliance

In this work, we develop a novel audio and video (A/V) disk which is not only stronger for fragmentation but also getting higher bandwidth for multimedia home appliances. For our work, multimedia workload characteristics and disk overheads in multimedia home appliance are analyzed and then the concept of extent is redefined. If track size is only multiple size of extents, every I/O operation do not have track switch overhead. We suggest three ways of implementing our model in a real disk drive and merits and demerits of each scheme are analyzed. Disk performance can show various patterns according to input workloads generated by filesystem. Designing fragmentation model is based on EXT3 filesystem and Disksim 3.0 are used for the simulation based performance evaluation. A state-of-the-art disk layout is added and many parameters are modified to reflect actual response time pattern of real disk in Disksim. Through our experiments, our model shows a significant improvement in bandwidth from 5% to 25% fragmentation ratio.