While the term "data center" can be used to describe any room used for the purpose of processing or storing data, as defined by OMB in 2010, a data center was a room greater than 500 square feet, used for processing or storing data, and which met stringent availability requirements. Other facilities were classified as "server rooms," which were typically less than 500 square feet and "server closets," which were typically less than 200 square feet.