Continuous-media files typically require very high disk-bandwidth rates to satisfy their data-rate requirements. Because disks have relatively low transfer rates and relatively high latency rates, disk schedulers must reduce the latency times to ensure high bandwidth.
However, reducing latency times may result in a scheduling policy that does not prioritize according to deadlines. In this section, we explore two diskscheduling algorithms that meet the QoS requirements for continuous-media
systems.