Facebook’s prototype cold storage system uses 10,000 Blu-ray discs to hold a petabyte of data

Only a fraction of Facebook’s hundreds of billions of photos are viewed regularly, while the rest languish pages deep in our profiles. These older images are rarely seen, but they still take up vital space on the company’s servers. Facebook has been searching for a new, more efficient way to store such pictures. Early last year, the company called for a new type of low-power flash memory that would allow infrequently-accessed data to be held in cold storage. Now Facebook has turned to another technology to store its information: Blu-ray discs.

The company has built a prototype system that uses 10,000 Blu-ray discs to store a petabyte of data. Speaking at this year’s Open Compute Summit, Facebook’s vice president of engineering, Jay…

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