... requests waiting An introduction to disk drive modeling Chris Ruemmler and John WilkesHewlett-Packard Laboratories, Palo Alto, CAMuch research in I/O systems is based on disk drive simulation ... knowledgeof the disk s rotation position.4,5 Modeling disk drivesWith this understanding of the various disk drive performance factors, we are ready to model the behaviorof the drives we have ... Thecontroller manages the storage and retrieval of data to and from the mechanism and performs mappingsbetween incoming logical addresses and the physical disk sectors that store the information.Below,...