Facebook, You Tube, Twitter, eBay, Amazon… These services, along with texting and gaming, have become essential elements in most of our lives. The huge growth in online and mobile transactions and communications has led to a phenomenal rise in generation of digital data. These data are processed, stored, managed and exchanged in places called data centres, of which there are now over 500,000 worldwide. Trade estimates suggest that in 2012 some 1.32 trillion gigabytes of data were created, that is equivalent to every person on the planet owning ten iPods.
The emergence of data centres and their growing number ref lects developments in infor mation and communication technologies. These include:
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