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Disk Scheduling

_ Disk service for any request must be as fast as possible

_ Scheduling meant to improve the average disk service time

_ Speed of service depends on

·        Seek time, most dominating in most disks

·        Latency time, or rotational delay

·        Data transfer time

_ Each disk drive has a queue of pending requests

_ Each request made up of

·        Whether input or output

·        Disk address (disk, cylinder, surface, sector)

·        Memory address

·        Amount of information to be transferred { (byte count)