Engineers at Facebook are installing a new photo storage system, dubbed Haystack — they say is 50% faster than traditional systems to better deal with 50 billion files worth of photos. Facebook has been rolling it out in limited test versions to parts of the network for the past few months. The company expects to use Haystack to store all Facebook photos by next week. “In terms of cost, if it’s twice as efficient, we can have 50% less hardware,” said Johnson. “With 50 billion files on disk, the cost adds up. It’s essentially giving us some [financial] headroom,” reports ComputerWorld.