Physical Permanence Gradient

# Physical Permanence Gradient **Entity class:** Concept or analytic term **Domain:** Continuity Architecture / Archival Storage **Doc Type:** Architectural Concept Node **Maturity:** Analytical Framework **Related:** [[Project Silica]], [[Cerabyte]], [[Synthetic DNA Data Storage]], [[Holographic Data Storage]] --- ## Definition The **physical permanence gradient** orders storage media by retention horizon, rewrite behavior, access latency, energy demand, density, environmental tolerance, and dependence on active maintenance. The source article uses this frame to compare glass, ceramic, DNA, and holographic vectors. ## Key insight No medium is simply “permanent.” A record survives only if its physical bits, metadata, decoders, indexes, provenance, custody, and interpretive institutions remain recoverable together. ## Neurotech cluster route **Collection:** [[collections/Neurotech|Neurotech]] **Source articles:** [[articles/The Architecture of Continuity and Emerging Neuroinformatics Standards|The Architecture of Continuity and Emerging Neuroinformatics Standards]] ## Relationships [[wiki/Physical Permanence Gradient|Physical Permanence Gradient]] is related to [[collections/Neurotech|Neurotech]] through [[articles/The Architecture of Continuity and Emerging Neuroinformatics Standards|The Architecture of Continuity and Emerging Neuroinformatics Standards]].  This entry's documented connections are expressed in its definition and related-work routes, with provenance retained in the source-linked material.  ## Related Work in the Corpus  - In [[articles/The Architecture of Continuity and Emerging Neuroinformatics Standards|The Architecture of Continuity and Emerging Neuroinformatics Standards]], ****5\. Next-Generation Archival Hardware for Neural Continuity**** provides the narrative context for **Physical Permanence Gradient**: Concept route: Project Silica · Cerabyte · synthetic DNA data storage · holographic data storage · physical permanence gradient · cold data.