Sony has built a prototype of a device that can hold onto a massive 1.5 petabytes of data for the long term — on good old Blu-ray discs.
The system, which stands more than 6 feet tall, contains 15,000 discs, distributed out onto 60 “platters,” with 10 stacks of 24 discs in each “platter.” It’s designed to consume just a teensy-weensy bit of power — 120 volts and 5 amperes.
The system takes 30 seconds to two minutes to retrieve information on a disk after retrieving the right one using a robotic arm near the top of the unit.
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http://venturebeat.com/2015/03/10/sony-whips-up-a-box-to-store-1-5-petabytes-of-data-on-10000-blu-ray-discs/