Computer hard drives have increased dramatically in capacity since their introduction in the (1950 mathrm{~s}). The first
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Computer hard drives have increased dramatically in capacity since their introduction in the \(1950 \mathrm{~s}\). The first commercial hard drive had a capacity of about 3. 8 MB stored on 50 circular platters, each \(610 \mathrm{~mm}\) in diameter. In the early part of this century, hard drives approached 1. 0 TB of storage using just five platters, each with a diameter of about \(90 \mathrm{~mm}\). By what order-of-magnitude factor does the storage capacity per unit area of a 21 stcentury drive exceed that of an original drive?
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