1 / 14

Government Information Preservation Working Group

Government Information Preservation Working Group. December 16, 2003. Obsolete and Endangered Tapes Source: 2003 Cornell University Library, Digital Preservation Management. 1/2" 9-track Reel Storage capacity: Standard bpi recording densities of 800-6250bpi. It is estimated that over 90%

graham-harding
Download Presentation

Government Information Preservation Working Group

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Government Information Preservation Working Group December 16, 2003 NIST

  2. Obsolete and Endangered TapesSource: 2003 Cornell University Library, Digital Preservation Management 1/2" 9-track ReelStorage capacity: Standard bpi recording densities of 800-6250bpi.It is estimated that over 90% of the world's data mine is still held on 9-Track DC6150 QIC-150Storage capacity: 150MbApproximate dates in use: 1990-1995 DC600A QIC-24Storage capacity: 60MbApproximate dates in use: 1990-1995 IBM 3480 cartridgeStorage capacity: 200MbApproximate dates in use: 1984-1994 Sony 8mm data cartridge QG-112MStorage capacity: 2.5-5GBApproximate dates in use: 1990-present DC9135 QIC tape 1/4"Storage capacity: 1.35GApproximate dates in use: 1990-1995 G2000 (DC2000 compatible) Storage capacity: 40MbApproximate dates in use: 1990-1995 Fujifilm DG-90M DDS cartridgeStorage capacity: 2.0 GBApproximate dates in use: 1993-present 4mm DAT (TDK DC4-120 DDS2)Storage capacity: 1 - 4 GBApproximate dates in use:1993- present Fujifilm DLTtape III XTStorage capacity: 15GApproximate dates in use:1994-present 4mm DAT (Verbatim DDS3 125M)Storage capacity: 12 GBApproximate dates in use: 1996- present NIST

  3. Obsolete and Endangered Disks Source: 2003 Cornell University Library, Digital Preservation Management 8" floppy disk (Radio Shack TRS80 Model II ) Storage capacity: 509,184 bytesApproximate dates in use: Late 1971-1981 5.25" floppy diskStorage capacity: 100KB-1.2MBApproximate dates in use: 1972-mid1980s 3 1/2" diskStorage capacity: 400K to 2.8 MBApproximate dates in use: 1982-present Sony 12" Magneto Optical Disk (WDM-3DL0)Storage capacity: 3.2G Double-sided(WORM) Approximate dates in use: 1985-1992 Sony Magneto Optical Disk EDM-600BStorage capacity: 600Mb Dual-Sided rewritable Approximate dates in use: Iomega 100 Zip disk Storage capacity: 100Mb Approximate dates in use: 1995-present CD-ROM disc Storage capacity: 650MbApproximate dates in use: 1984-present NIST

  4. User-Removable Digital Storage Media Timeline Paper Magnetic Magnetic Magnetic Optical Optical Optical ??? (Infrared (Red (Blue/Violet Laser) Laser) Laser) Punch Cassette 5 Floppy 3.5” Floppy CD DVD ** Card Tape Disk Disk Disc Disc Disc ??? l______________________l_____________________l_____________________l________________________l__ 1970 1980 1990 2000 2005+? Future ** Blu-Ray Disc, Advanced Optical Disc, or other. Timeline illustrates the changes in common “removable” storage media Source: Technical Advisory Service for Images (TASI) 2002, extended NIST

  5. Digital Preservation Options • Duplication (tape to tape) • Media migration (tape to disc, disc to tape) • Digital encoding format (old-to-new) • Emulation (simulation of previous software) • Hardware/software and OS preservation • Outsourcing • Wait and see, deal with it later • Convert to analog (i.e. print documents, microfilm) NIST

  6. Selecting Storage Media for Long-Term Preservation An example scorecard, comparing some common media types 1 (does not meet the criterion) to 3 (fully meets the criterion). As a general rule, no medium which scores less than 12 should be considered. Media CD-R DVD-RZip Disk 3.5” Magnetic Disk DLT DAT Longevity 3 3 1 1 2 1 Capacity 2 2 1 1 3 3 Viability 2 2 1 1 3 3 Obsolescence 3 2 2 3 2 2 Cost 3 2 1 1 3 3 Susceptibility 3 3 1 1 3 2 Total 16 14 7 8 16 14 Source: THE NATIONAL ARCHIVES, Digital Preservation Guidance Note 2: Selecting storage media for long-term preservation, June 19, 2003. http://www.pro.gov.uk/about/preservation/digital/guidance/selecting-storage-media.pdf NIST

  7. Digital Preservation Strategy Preserve what?  To what?  Now what? Future access NIST

  8. Considering CDs, DVDs? • What’s to consider? • Life expectancy • Quality variations • Interoperability/compatibility • Robustness NIST

  9. Factors that affect Disc LE • Type • Manufacturing quality • Condition of the disc before recording • Quality of the disc recording • Handling and maintenance • Environmental conditions NIST

  10. Maximizing Disc Usefulness • Care and Handling • Consider environmental influences • Physical handling • Storage conditions • Labeling • Cleaning NIST

  11. CD, DVD Landscape NIST

  12. CD vs DVD Construction NIST

  13. Double-Sided DVDs NIST

  14. Care and Handling of CDs and DVDs A Guide for Librarians and Archivists Co-Published by NIST and CLIR NIST Publication http://www.itl.nist.gov/div895/carefordisc/CDandDVDCareandHandlingGuide.pdf One-Page Reference from the Guide http://www.itl.nist.gov/div895/carefordisc/onepage.pdf CLIR Publication http://www.clir.org/pubs/abstract/pub121abst.html NIST

More Related