Facebook has a lot of data, a frankly mind-boggling amount of data, and vast swathes of it are accessed approximately never. Rather than keep that archive-level data readily at hand on expensive, distributed, replicated content delivery networks Facebook keeps it in cold storage, saving money at the expense of recall speed. The company recently announced plans to replace their existing hard-drive-based cold storage system with a custom Blu-ray archive. 10,000 discs in a seven-foot rack with a capacity of about a petabyte. That’s a lot of photos of cats, parties and babies. However…
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