Fred ByersNIST1 Government Information Preservation Working Group December 16, 2003

Fred ByersNIST2 Obsolete and Endangered Tapes Source: 2003 Cornell University Library, Digital Preservation Management 4mm DAT (TDK DC4-120 DDS2) Storage capacity: GB Approximate dates in use: present Fujifilm DLTtape III XT Storage capacity: 15G Approximate dates in use: 1994-present 4mm DAT (Verbatim DDS3 125M) Storage capacity: 12 GB Approximate dates in use: present DC9135 QIC tape 1/4" Storage capacity: 1.35G Approximate dates in use: G2000 (DC2000 compatible) Storage capacity: 40Mb Approximate dates in use: Sony 8mm data cartridge QG-112M Storage capacity: 2.5-5GB Approximate dates in use: 1990-present Fujifilm DG-90M DDS cartridge Storage capacity: 2.0 GB Approximate dates in use: 1993-present DC6150 QIC-150 Storage capacity: 150Mb Approximate dates in use: DC600A QIC-24 Storage capacity: 60Mb Approximate dates in use: IBM 3480 cartridge Storage capacity: 200Mb Approximate dates in use: /2" 9-track Reel Storage capacity: Standard bpi recording densities of bpi. It is estimated that over 90% of the world's data mine is still held on 9-Track

Fred ByersNIST3 Obsolete and Endangered Disks Source: 2003 Cornell University Library, Digital Preservation Management 8" floppy disk (Radio Shack TRS80 Model II ) Storage capacity: 509,184 bytes Approximate dates in use: Late " floppy disk Storage capacity: 100KB-1.2MB Approximate dates in use: 1972-mid1980s 3 1/2" disk Storage capacity: 400K to 2.8 MB Approximate dates in use: 1982-present Sony 12" Magneto Optical Disk (WDM-3DL0) Storage capacity: 3.2G Double-sided (WORM) Approximate dates in use: Sony Magneto Optical Disk EDM-600B Storage 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: 650Mb Approximate dates in use: 1984-present

Fred ByersNIST4 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__ ? 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

Fred ByersNIST5 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)

Fred ByersNIST6 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 Capacity Viability Obsolescence Cost Susceptibility Total Source: THE NATIONAL ARCHIVES, Digital Preservation Guidance Note 2: Selecting storage media for long-term preservation, June 19,

Fred ByersNIST7 Digital Preservation Strategy Preserve what?  To what?  Now what? Future access

Fred ByersNIST8 Considering CDs, DVDs? What’s to consider? Life expectancy Quality variations Interoperability/compatibility Robustness

Fred ByersNIST9 Factors that affect Disc LE Type Manufacturing quality Condition of the disc before recording Quality of the disc recording Handling and maintenance Environmental conditions

Fred ByersNIST10 Maximizing Disc Usefulness Care and Handling – Consider environmental influences – Physical handling – Storage conditions – Labeling – Cleaning

Fred ByersNIST11 CD, DVD Landscape CD CD-R, CD-RW, VCD CD-ROM CD-DA, CD-I, CD+G, DVD DVD-R General, DVD-R Authoring, DVD-RW, DVD+R, DVD+RW, DVD-ROM DVD-Video DVD-Audio DVD-RAM,

Fred ByersNIST12 CD vs DVD Construction

Fred ByersNIST13 Double-Sided DVDs

Fred ByersNIST14 Care and Handling of CDs and DVDs A Guide for Librarians and Archivists Co-Published by NIST and CLIR NIST Publication One-Page Reference from the Guide CLIR Publication