It is the job of the operating system to arrange the blocks in the correct sequence when a file is written to disk. When discussing magnetic disks, why is this step absolutely necessary? Would it make any difference if solid-state drives (SSDs) were utilized instead, or is it moot either way? So, what gives?

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Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.