RAID and disc scheduling Operating systems handle disc scheduling to optimise overall system performance by scheduling input/output requests for the disc. This is important since, for the past four decades, the improvement in CPU and main memory speed has been incomparable to the increase in disc speed. Aside from speed, disc storage space is a significant aspect in determining a system's overall performance. Even when other resources are running at high speeds, insufficient disc space might be a hurdle for system performance. As a result, disc arrays that function independently and in parallel have been developed. Question List and briefly describe the several levels of schemes by which the operating system perceives a group of physical disc devices as a single logical drive

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