Cost to Store All US Phonecalls Made in a Year so it Could be Datamined

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3	Cost to Store All US Phonecalls Made in a Year in Cloud Storage so it could be Datamined
4	estimates by Brewster Kahle June 12, 2013, done to check feasibility of news reports of NSA survaillance
5	corrections welcome: brewster@archive.org
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7	number of call-minutes per person per month	300	minutes (estimate from my family's usage)
8	sides in a phonecall (caller+receiver)	2	since most calls are domestic, only need to record a call once for each reciever/caller pair
9	number of people in the US	315,000,000	https://www.census.gov/
10	number of bytes/sec in a phonecall	8,000	this is the uncompressed number, could be compressed to 1/2 to 1/4 easily
11	cost of a Petabyte (PB) of "cloud" storage	$100,000	this is basically what the Internet Archive pays. Petabyte = 1,000 terabytes
12	Square feet of datacenter space per petabyte	16	2 feet wide by about 8 feet including corridor between racks
13	Power to run a PB	5	kilowatts
14	Cost per KWhr	$0.15	California costs (higher than much of the country, could be 1/2 in other places)
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18	number of bytes/min in a phonecall	480,000	calculated from above
19	number of bytes/month for a person	144,000,000	calculated from above
20	number of bytes/month for the US	22,680,000,000,000,000	calculated (divided by 2 because there is a caller and reciever, don’t need to double count)
21	number of PB/month for the US	23	calculated
22	number of PB/year for the US	272	calculated
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24	Cost to store all phonecalls made in a year in the "cloud"	$27,216,000
25	Square feet to store all phonecalls	4,355
26	Cost of datacenter power for all phonecalls for a year	$1,788,091
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