Current Portable Optical Media
Materials saved to DVDs, CDs or other optical media in the last five years where the reader devices are still supported and can be integrated easily into hardware infrastructure.
Examples
CDs, DVDs produced in the last five years.
Hazards
Poor storage conditions; encryption; digital rights management; uncertainty over IPR or the presence of orphaned works; lack of replication; lack of documentation; lack of periodic testing; lack of refreshment pathway; lack of access to readers; out of manufacturers’ warranty or no warranty; storage in paper files; environmental disasters; technical preservation measures.
Hardware/MediaMitigations
Regular review and testing; replication; refreshment plan; comprehensive documentation; high quality storage; regular maintenance of readers; multiple readers available.
Bit List History
Added to list: 2019Last Review
2023 Review
The 2019 Jury introduced this entry to ensure that the range of media storage is properly assessed and presented. The 2020 and 2020 Juries, and 2022 Taskforce, agreed with the entry’s assigned risk classification with no noted changes towards increased or reduced risk (no change to trend).
The 2023 Council agreed with the risk classification of Endangered with the overall risks remaining on the same basis as before (‘No change’ to trend). Additionally, the Council recommended that a nomination received for ‘DVDs produced under copyright’ would provide a valuable example to this entry rather than as a new, standalone entry.
2024 Interim Review
These risks remain on the same basis as before, with no significant trend towards even greater or reduced risk (‘No change’ to trend).
Additional Information
This entry is highly dependent on who is looking after the portable media but made more difficult over time. The lack of granularity in the definition means that only general advice can be offered, such as to refresh media. In time, it may yet be more useful to split all storage media (maybe 100 items long) with an indication of how long these can be expected to last. In many cases, specialists can recover obsolete media, but the cost of employing them can become an aggravating condition.Case Studies & Examples
- One example, presented to the Council through a 2023 nomination, concerns the loss of digital materials stored in DVDs. A 3,500 DVD ‘film collection’ was destroyed during the fire at the University Library Archives and Special Collections, University of Cape Town, South Africa. There were no backup copies in large part because of the (mis)understanding that they were prevented by copyright from making backup copies. This example extends beyond the loss of material in the optical media, particularly in respect to backups and issues surrounding copyright, but in the context of the entry shows how aggravating factors can place content at greater risk due to aggravating factors not only to copyright but also global warming with more such fires, floods and natural disasters to be expected. See Devastating Cape Town fire destroys University Library Archives and Special Collections, News in Conservation (2021), [accessed at 2023-10-24].