Assume that there is a 11% rate of disk drive failure in a year. a. If...
Assume that there is a 11% rate of disk drive failure in a year. a. If all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. If copies of all your computer data are stored on three three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive? a. With two hard disk drives, the probability that catastrophe can be avoided is
Homework Answers
a) With two hard disk drives,
P(Avoid catastrophe)
= P(Atleast one working)
= 1 - P(Both fails)
= 1 - (0.11)2
= 0.9879
b) With three hard disk drives,
= P(Atleast one working)
= 1 - P(All three fails)
= 1 - (0.11)3
= 0.998669
Note - I have written the exact answers. Please round off the probabilities as per the question demands.
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