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Twisting this slightly.... - 25,000 journals, 10 articles per journal, 4 issues a year per journal = 1,000,000 - Doubled for theseis, conference articles & books => 2 million items Now, ROAR & OpenDOAR list 1,400 repositories.... which is over 1,400 items per repository, per year!!! (There are, what - 230 working days in the year... which means that each repository need to process 6 items a day, every day, to stay on top of that) Now tell me that IRs are insignificant in the scheme of things :chuckle: Arthur Sale wrote: > Back of envelope engineering-style estimate (ie very rough): > > Assume 25,000 research journals worldwide, 10 articles per issue, 4 > issues per year, each article = 200kB on average. Total = 200 x 10^9 , > 0.2 PB (Peta-bytes) annually. > > Even more crudely, double to allow for all theses, conference articles > and books = 0.4 PB annually. -- Ian Stuart. Bibliographics and Multimedia Service Delivery team, EDINA, The University of Edinburgh. http://edina.ac.uk/ This email was sent via the University of Edinburgh. The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.