Thursday, November 15, 2007

Mass digitizations and preservations.

What's digital preservation:
Definition changes monthly but basically storing digital objects wile retainings a balance of usability and faithfulness to their creators' original intentions.

Policy challenges include:
  • how faithful do we have to be, how long, at what cost, how many replicas?
  • how much manipulation can the item tolerate? We have to manipulate with new technologies come out.
  • Rightsmare (copyright)
Technical challenges
  • Lots of files, lots of data can take months to move and replicate
  • explore data transfer and replication options
  • survey tool performance and usability
  • continuing conversations with the San Diego Supercomputer Center and the Library of Congress with goal of creating guidelines.
  • Making many files small - we need to learn how to make these files smaller so we can move them faster?
Why mass digitization?
For better access and search. Can act as a back up to safeguard against loss. It is NOT intended to replace the physical item.

Tradeoffs between size and quality. National Library of France, Harvard University Libraries and UC Berkeley did a lot of testing. What they found include recommendations: JPEG 2000 JP2 (ISO/IEC 15444-1) file format and an all color, all glossy solution is feasible. We can't forget audio/video. Now we need cheaper and still reliable disks to store all this data. One solution is to go to the aggregate W/ARC file format.

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