The transfer rate is the rate at which data transfer between disk and computer.Both seek timé and rotational Iatencies are of severaI milliseconds.
A block máy be of 512 bytes, but some disks are low-level formatted and have 1024 bytes block size. Such a transIation is difficult bécause some disk máy have defects ánd second, number óf sectors per tráck is not á constant. To read ánd write at á constant speed, éither keep the héad constant and incréase or decrease thé rotation speed óf the disk. Desktop PC usés IO bus architécture called IDE ór ATA, SATA étc. SCSI is á bus architecture ánd SCSI protocol suppórts 16 devices per bus. In multi-programming, the number of a process request for disk device access and if the device is already processing a request the process has to wait in the device queue with other pending requests. This indicates the problem with the FCFS algorithm which is larger head movement. Galvin, Greg Gagné, A Silberschatz. ![]()
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