39. If 800GB server-grade HDDs cost $300, electricity costs $0.10 per kilowatt hour, and facilities cost $0.01 per GB per month, use the disk specification in Figure 7.15 to determine how much it costs to store 8TB of data online for 5 years. Assume that the HDD is active 25% of the time.

What can be done to reduce this cost? Hint: Use the “Read/Write” and “Idle” power requirements in Figure 7.15. Use the tables below as a guide.

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Specifications Hours/year 8,760 Cost per kWh 0.1 Active percentage 0.25 Hours active/yr Active watts Idle percentage Idle watts Facilities Fixed cost per GB per month 0.01 Number of GB 8,000 Total cost per month Number of months Total facilities cost 0.25 x 8,760 = 2,190 kWatts consumed active Hours idle/yr kWatts consumed idle Total kWatts Energy cost/yr x 5 disks 5 years + disk costs $300 10 Grand total: