A data centre is a room or an entire building housing computers, network connection equipment and telecommunications links. Many data centres are built for the exclusive use of just one company, such as Google, but others host – and interconnect – systems belonging to many different users. One of the world’s largest multi-user data centres was once a high-volume printworks. R.R. Donnelley & Sons’ Calumet Plant, on East Cermak Road on the southern edge of the Chicago Loop, printed Time, Life, the Sears Roebuck catalogue and telephone directories. The building is now a data centre used by – among others – telecoms companies, financial exchanges and automated trading firms.
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