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[8 points] A datacenter has 1,000 disks which are always powered on. Assume that the mean-time-to- failure (MTTF) for one disk is 200,000 hours. How

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[8 points] A datacenter has 1,000 disks which are always powered on. Assume that the mean-time-to- failure (MTTF) for one disk is 200,000 hours. How many disks does one expect to replace in one year

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