Modern academic libraries preserve collections that include not only printed materials such as, books, periodicals, newspapers, and magazines, but also electronic resources such as art reproductions, films, sound and video recordings, maps, photographs, microfiches, microfilms, CD-ROMs, computer software, online databases, and other media. In addition to preserving collections within library buildings, modern academic libraries often feature telecommunications links that provide users with access to information at remote sites. Digital preservation, in this context is the process of giving electronic information resources long life. Preservation of Electronic Information Resources is essentially a way of preserving the functionality of and access to digital information which might otherwise be lost due to technological obsolescence, therefore, migration and other methods of preserving electronic records can be adopted. Migration is a set of organized task designed to achieve periodic transfer of digital materials from one hardware/software configuration to another or from one generation of computer technology to a subsequent generation.
Digitization of information resources for making digital library is the process of converting information into a digital (i.e. computer-readable) format. The result is the representation of an object, image, sound, document, or signal (usually an analog signal) obtained by generating a series of numbers that describe a discrete set of points or samples. The result is called digital representation or, more specifically, a digital image, for the object, and digital form, for the signal. On the one hand it can be argued that dramatic changes have been made at academic libraries in response to the new digital information environment. Most academic libraries, including University Libraries in Nigeria, offers a wide range of digital services and resources. But on the other hand, at a closer examination, one will find that these services and resources are mainly organized according to traditional library principles. In this case a guiding principle for the digital library need to be set up to create systematic and well organized general services and e-resources, for example subject specific gateway services. Thus, the digital part of the library functioned as an extension of the traditional library, an enterprise on the side with relatively high priority in this digital age, especially for of e-journals
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