There are 16 surfaces, each with 100,000 tracks per surface. The disk rotates at 8800 rounds per minute. Each track consists of 1024 sectors, each of which can store 1024 bytes. 10% of each track is used for gaps. The overhead to move the r/w head to a different cylinder is 1 ms, plus lms to move over 5000 tracks. Suppose we use mirrored disks of the kind introduced in the question above. Also suppose the probability of any disk failure is 5%. (a) What is the mean time to a disk failure resulting in loss of data, assuming it takes 5 hours to replace a disk? (b) Also determine how long it takes actually to copy the entire disk