Obsolete Formats
PROVISIONAL evidence grade of this record
Carriers whose playback and migration paths are disappearing: reel-to-reel and cassette tape, U-matic and half-inch video, floppy disks, unlabeled CDs, MiniDV/DAT with dead transfer software.
Notes
Merged into canonical KG 2026-10-03 from PRESERVE-001; source entity IDs: CTL-DR-PRESERVE-001:CTL-PRESERVE-E-005; source research type(s): risk. Era not present in source research record(s); marked unspecified pending human review.
Sources
- NEDCC, '40 Years of HBCU Radio Broadcast Formats' (Aug 20, 2026) — https://www.nedcc.org/about/nedcc-stories/hbcu-formats (primary source)
- UChicago News, 'The hidden history of guerrilla television: UChicago scholars preserve decades-old videos' — http://news.uchicago.edu/story/hidden-history-guerrilla-television-uchicago-scholars-preserve-decades-old-videos (primary source)
- History News Network, 'Progress Digitizing the Johnson Publishing Archive' — https://www.hnn.us/article/progress-digitizing-the-johnson-publishing-archive
Record CTL-E-0762 · CultureTechLens Knowledge Graph · evidence grade: PROVISIONAL · 3 sources (2 primary) · CTL research: PRESERVE-001.
Directory: all entity records · the knowledge graph
Cite this record
Chicago: CultureTechLens. “Obsolete Formats (CTL-E-0762).” CultureTechLens Knowledge Graph. Chicago, IL: CultureTechLens, 2026. https://culturetechlens.com/graph/entities/ctl-e-0762/
APA: CultureTechLens. (2026). Obsolete Formats (CTL-E-0762) [Entity record]. CultureTechLens Knowledge Graph. https://culturetechlens.com/graph/entities/ctl-e-0762/
MLA: CultureTechLens. “Obsolete Formats (CTL-E-0762).” CultureTechLens Knowledge Graph, 2026, https://culturetechlens.com/graph/entities/ctl-e-0762/
Citation guidance for teachers, journalists, and funders: How to Cite Us.
From the Archive
The archive in pictures
The people, places, and institutions this work documents. Photographs from the CultureTechLens research record — rights-cleared, credited, and cited like everything else here.



Trust & evidence
Evidence before authority. CultureTechLens publishes its methods, its limits, and its corrections alongside its findings. Claims carry grades — VERIFIED, SUPPORTED, PROVISIONAL, DISPUTED, UNRESOLVED — and unknowns are never reported as zero.
Every claim graded. Every source named. Every correction public — none to date.