1000 disks having 1,200,000-hour MTTF and disks being used 24 hours a day, and failed disks are being replaced with a new ones, then no that will fail over five years (43,800 hours) is,

1000 disks having 1,200,000-hour MTTF and disks being used 24 hours a

1.	1000 disks having 1,200,000-hour MTTF and disks being used 24 hours a day, and failed disks are being replaced with a new ones, then no that will fail over five years (43,800 hours) is,
A.	25
B.	30
C.	36
D.	40
Answer» D. 40

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1000 disks having 1,200,000-hour MTTF and disks being used 24 hours a day, and failed disks are being replaced with a new ones, then no that will fail over five years (43,800 hours) is,

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