Assume that annual failure rate varies over the lifetime of disks in the previous table. Speciically, assume that AFR is three times as high in the 1st month of operation and doubles every year starting in the 5^th year. How many disks would be replaced after 7 years of operation? What about 10 years?

Measurements and statistics provided by storage vendors must be carefully interpreted to gain meaningful predictions about their system behavior. The following table provides data for various disk drives.

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a. b. # of Drives 1000 1250 Hours/Drive 10,512 8760 Hours/Failure 1,200,000 1,200,000