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Memory Systems by David Wang, Spencer Ng, Bruce Jacob

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CHAPTER 21

Operational Performance Improvement

In many systems the access speed to data is the limiting factor for the performance of the entire system. While a disk drive with a given electro-mechanical design comes with certain raw performance characteristics that cannot be changed, such as its revolution time and seek profile, operation of the drive by its controller can bring about some differences in user-observable performance. Some of these techniques may also be implemented at the operating system level, in the form of data placement and scheduling algorithms. However, the drive controller, having detailed information about all the drive’s parameters (e.g., formatting) and its current states (e.g., position of the head), usually has ...

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