1. With respect to the operating cost k, we find an average annual cost of storage of approximately $0.23 per GB from Diogenes Labs (2008) and $0.186 per GB from Oracle (2015) (for the EMC Isilon Single-copy disk solution with 3,262TB usable disk capacity). Therefore, we assume an annual operating cost of $0.2 per GB which translates to approximately a monthly cost of $0.02 per GB. As before, we normalize our estimates by dividing them by ? = 400GB. In addition, we also divide the production cost estimate by 48 months (or 4 years), which is the average useful life of a server;Accordingly;which gives approximately {$2 � 10 3 , $4 � 10 3 , $6 � 10 3 , $8 � 10 3 }
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