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Fossilised bones did not store digital files, but their ability to preserve traces of DNA inspired a laboratory method for protecting digitally encoded DNA. ETH Zurich researchers encapsulated synthetic DNA in silica particles and reported that an 83 kB archive could be recovered without errors after 2,000 years of simulated ambient-temperature storage, using error-correction coding. That result is a simulation—not a 2,000-year observation—and it does not mean DNA archives are commercially ready.
How can DNA store digital data?
Digital information is represented as sequences of DNA’s molecular building blocks. To retrieve a file later, researchers must be able to synthesize the encoded DNA, protect it from damage, and read and decode it. DNA molecules alone do not guarantee that the original file will survive: the encoding scheme and built-in redundancy also affect whether errors can be corrected.
ETH Zurich’s Functional Materials Laboratory calls its protective approach “synthetic fossils.” Researchers encapsulate synthetic DNA in silica, a glass-like mineral matrix inspired by the way mineralized material can shield biomolecules. The matrix protects nucleic acids from environmental attack, including reactive oxygen species and high temperatures; a titanium dioxide layer can add protection from ultraviolet radiation. In the laboratory, the particles can be dissolved with diluted fluoride buffer to recover the DNA. This is a research technique, not a consumer storage product. ETH Zurich: Fossilized DNA
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What was stored in the ETH prototype?
ETH reports that researchers encoded 83 kB of data: Archimedes’ Methods of Mechanical Theorems and the Swiss Federal Charter. With silica encapsulation and forward error-correction coding, they recovered the data without error after 2,000 years of simulated ambient-temperature storage. The figure describes a simulation, not a file that was physically stored and retrieved two millennia later. ETH’s summary also identifies the cost of array-based DNA synthesis as an obstacle to competing with established magnetic storage. ETH Zurich: Fossilized DNA
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How long can DNA data last?
There is no single lifespan that applies to all DNA archives. A storage result depends on the DNA’s physical protection, the aging conditions used, and whether the coding and error correction can reconstruct the data after damage. Findings about biological DNA in fossils are useful context, but they do not directly predict how long an intentionally encoded digital file will remain readable.
What fossil DNA tells us—and what it does not
A 2012 study of 158 radiocarbon-dated bones from New Zealand moa estimated an average half-life of 521 years for a 242-base-pair mitochondrial DNA sequence in that assemblage. The researchers also found substantial variation among samples that geological age alone did not explain. This is a result for a geographically constrained set of bones and one DNA sequence, not a universal DNA clock. Allentoft et al., Proceedings of the National Academy of Sciences
A 2021 review of DNA stability in data-storage systems argues that useful longevity inferred from fossil DNA could be a few hundred years or less under the assumptions it discusses. The review emphasizes that recoverable digital data depends on the encoding strategy and physical redundancy. Its assessment is not a settled universal limit for every storage design. Review of DNA stability in data-storage systems
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsAncient DNA is often scarce and fragmented rather than intact. A 2018 silica-based extraction protocol describes recovering fragments of at least 35 base pairs, and ultrashort fragments of at least 25 base pairs. DNA persisting in a fossil therefore does not show that a complete genome—or a readable digital file—survived. Silica-based ancient DNA extraction protocol
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Natural bone preservation depends on its history
Burial conditions and what happens after excavation both matter. In a 2007 study of 247 herbivore fossil bones, up to 50,000 years old and from 60 archaeological and paleontological contexts, freshly excavated, untreated, unwashed bones contained six times more DNA and yielded twice as many authentic DNA sequences as bones subjected to standard treatments. In a split aurochs comparison, washed museum-stored material did not amplify while recently excavated samples did; the authors estimated that at least as much amplifiable DNA was lost during 57 years in a collection as during the preceding 3,200 years in burial. Those findings apply to the samples and procedures studied, not to every museum collection. Pruvost et al., Proceedings of the National Academy of Sciences
A 2025 Communications Biology study compared caribou ribs excavated in 1978 and 2021 from the same West Greenland site. The average fragment length in stored samples declined from 70 bp to 55 bp across the 43-year interval, and the 2021 in-situ material was better preserved. The authors discuss possible differences in temperature, oxygen, and humidity and call for further work on museum storage climates. This one-site comparison is a caution, not a general rule for museum bones. Communications Biology, 2025
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does silica encapsulation compare with salt-stabilized DNA?
A separate 2020 report described DNA dried with inorganic salts, including calcium phosphate. It reported 115 kB of encoded data remaining error-free after accelerated aging. This is a different experiment from ETH’s silica-encapsulated prototype; the aging methods differ, so the reported quantities do not establish which approach lasts longer.
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| Approach | Protection method | Reported data result | Aging evidence | What it establishes |
|---|---|---|---|---|
| ETH synthetic fossils | DNA encapsulated in silica particles | 83 kB recovered without error | 2,000 years of simulated ambient-temperature storage | Laboratory demonstration; not a commercial product |
| Salt-stabilized DNA | DNA dried with inorganic salts, including calcium phosphate | 115 kB reported error-free | Accelerated aging | Separate laboratory experiment; not a commercial product |
The salt result was reported by Chemistry World in 2020. Because it is a secondary-source account and uses a different aging protocol, it supports a comparison of experimental approaches, not a direct durability ranking. Chemistry World: DNA storage protected by salt
Is DNA data storage available yet?
The cited work describes specialized laboratory methods and research-stage demonstrations, not a consumer-ready device or archive service. The sources do not establish general-reader availability or pricing. ETH identifies DNA synthesis cost—particularly array-based synthesis—as a barrier to making the approach competitive with magnetic storage. Until that and other practical requirements are addressed, the 2,000-year figure should be understood as a simulated research result rather than a product guarantee. ETH Zurich: Fossilized DNA
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