A presentation on Digital Preservation by Rupesh Kumar A, Assistant Professor, Department of Studies and Research in Library and Information Science, Tumkur University, Tumakuru, Karnataka, India.

1. Digital Preservation
RupeshKumarA
Email:a.rupeshkumar@gmail.com

2. Digital Preservation
• Digital preservation is a formal procedure to ensure that
digital information of continuing value remains accessible
andusable.
• Digital preservation is the method of keeping digital material
alive so that they remain usable as technological advances
render original hardware and software specification obsolete
(Harrod’s Librarians Glossary).

3. Methods/Techniques/Strategies
• BitstreamCopying
• Refreshing
• Durable/PersistentMedia Storage
• Technology Preservation
• DigitalArchaeology
• Analog Backup
• DataMigration

4. BitstreamCopying
• Bitstreamcopying is commonlyknown as“databackingup”
• It istheprocess of makingan exactduplicateof a digitalobject.
• Bitstreamcopying is nota long-termpreservation technique.
• It dealswithdataloss due tohardware and mediafailure.
• Bitstreamcopying isoftencombinedwithremotestorage.

5. Refreshing
• Refreshingis to copy digital informationfrom long-term
storage mediumto anotherof thesame type.
• For example,bitstreams may be copied from an old
CD/DVD/DAT tape to a newCD/DVD/DAT tape .
• Refreshingaddresses theproblem of deterioration of physical
storage medium.

6. Durable/PersistentMediaStorage
• This involves the use of long-termstoragemediatobackup the
digitaldata.
• For example,Gold CDs are usedtoback up datainsteadof
ordinary CDs.
• Gold is used in place of superaluminiumcommonlyused in
ordinary CDs.
• Gold CDs have higher resistanceto corrosion.
• They are moredurablethanordinary CDs.
• This durability ensures long-termstorageofdata.

7. GoldCD

8. TechnologyPreservation
• TP involves preserving the technical environment that runs
the system, including operating systems, original application
software, mediadrives, and thelike.
• It is sometimescalled the"computermuseum"solution.
• This strategy is expensive and hence, cannot be afforded by
smallinstitutions.

9. Digital Archaeology
• Digital Archaeology involves methods and procedures to
rescue content from damaged media or from obsolete or
damagedhardware and software environments.
• DA is an emergencyrecovery strategy
• It usually involves specialized techniques to recover
bitstreams from media that has been rendered unreadable,
eitherdue tophysical damageor hardware failure.

10. Analog Backup
• Analogbackup combines the conversion of digital objects into
analogform with theuseof durable analogmedia.
• Generally, HD-Rosetta or silver halide microfilms are used to
store data.

11. HD-Rosetta Disk Silver Halide Microfilm

12. Data Migration
• Data Migration means to copy data, or convert data, from one
technology to another, whether hardware or software,
preserving theessentialcharacteristics of thedata.
• Data migration may include replication, normalization,
canonicalization,emulationor encapsulation.