According to the IDC White Paper 'the Digital and Exploding Digital Universe' the figure is 1800 Exabytes (of which approx. one third is 'professional services' - as opposed to Manufacturing/Retail/Government/Financial/Media sectors which constitutes the remainder) and not 180 Exabytes as stated! see URL: http://www.emc.com/collateral/analyst-reports/diverse-exploding-digital-universe.pdf stuart macdonald EDINA -- Stuart Macdonald EDINA National Data Centre & Edinburgh University Data Library 0131 650 3304 (Tu & Th) 0131 651 1744 (M, W, F) The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.