(Answered) The data density of a blu-ray disk using a 405-nm laser is

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The data density of a Blu-ray disk using a 405-nm laser is 1.5 × 107 bits mm-2. Disks have an outside diameter of 120 mm and a hole of 15-mm diameter. How many data bits can be contained on the disk? If a Blu-ray disk can hold 9,400,000 p of text, how many data bits are needed for a typed page? (Hint: Determine the area of the disk that is available to hold data. The area inside a circle is given by A = πr2, where the radius r is one-half of the diameter.)

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