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... (CD-ROM, magneto Optico, and WORM) at anywhere from 5 to 100 years, depending upon manufacture and storage conditions. Magnetic tape is given a life expectancy of two to thirty years (National Media =-=Lab, 1994-=-). Given the extreme span of these estimates, as Jeff Rothenburg (1995) stated in his article, "Insuring the Longevity of Digital Documents": "It is only slightly facetious to say that digital informa...

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... to write the digital information to the media and to store and retrieve it. Estimates vary, but rates of hardware and software obsolescence can be anywhere from two to five years (Research Libraries =-=Group, 1995-=-, p. 3). Data refreshment and migration have been posed as solutions to the problems of technological obsolescence. Refreshment is the act of copying from one medium to another; however, given the lif...

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...ng, these files are difficult to manage in a production environment. As a point of comparison, a laser printer produces a page with a resolution of 300 dpi; an average typeset book has a dpi of 1200 (=-=Robinson, 1993-=-, p. 11). A 300 dpi resolution bilevel image will render a typeface of 6 points mostly readable on a computer screen. It will ordinarily print well (though not to publication standards). A 600 dpi res...