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Tell me what is meant by arm-stickiness?

Answer:

If one or a few processes have a high access rate to data on one track of a storage disk, then they may monopolize the device by repeated requests to that track. This generally happens with most common device scheduling algorithms (LIFO, SSTF, C-SCAN, etc). High-density multisurface disks are more likely to be affected by this than low density ones.

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Tell me what clients or sectors have you worked with in the past?Explain me in the context of memory management, what are placement and replacement algorithms?