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 Cost per kWh Active percentage 8,760 0.1 0.25