"Hard disks are nice but they take power and they break," Van Gulik said.
Instead, he said, "We store it in very large tape robots the size of a small tennis field which is basically packed with tapes and lots of arms and robots moving around to move the tapes around."
A hard disk containing one or two hours of high-definition video would cost between £30 and £40 a year in electricity alone. With overhead costs for the building or cooling that amount would be even higher. If the data is stored on tapes in a tape robot the cost for the same amount of data can be reduced to pennies, he said.
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