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Microsoft Project Silica stores digital data inside glass using ultrafast lasers, then reads it optically. Microsoft and the project’s research team estimate that the data could remain intact for at least 10,000 years based on accelerated-aging tests—not on observing a plate for that long. The work is archival research, not a storage product you can currently buy.
How does Microsoft store data in glass?
Project Silica uses ultrafast femtosecond laser pulses to encode data as microscopic structures called voxels inside glass. An optical reader examines those structures to recover the data. Microsoft describes the system as write-once/read-many: reading does not rewrite the stored information, and the writing and reading operations are separated.
The project is not just a glass plate. Its intended archival system includes the glass medium, laser writers, optical readers, library mechanics and software for encoding and decoding information. Microsoft says the design is intended to keep archived data offline, with mechanical separation that prevents media from being returned to a writer. These are Microsoft’s descriptions of the system, not independent security certifications. Microsoft Research’s Project Silica overview
What changed in the 2026 research?
Earlier Project Silica work used polarization-based birefringent voxels. In its February 18, 2026 update, Microsoft described writing data in ordinary borosilicate glass as well as fused silica, and adding “phase voxels,” which encode changes in the glass’s phase and can be written with a single pulse.
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The team also reported parallel multi-beam writing and machine-learning classification to address interference among recorded structures. Its updated reader can use one camera rather than three or four, and the writer requires fewer parts, according to Microsoft. The team’s paper, “Laser writing in glass for dense, fast and efficient archival data storage,” was published in Nature on February 18, 2026. Microsoft Research’s 2026 update · Nature paper
Is the 10,000-year lifespan real?
It is a research-based estimate, not a guarantee or a direct 10,000-year observation. Microsoft says accelerated-aging tests and a nondestructive optical method for assessing voxel aging support the conclusion that the data should remain intact for at least 10,000 years. Nature News likewise reported that the system could remain readable for at least that long, attributing the result to the team’s work. The estimate should not be read as a promise for every plate, storage environment or future reader. Microsoft Research’s explanation of the estimate · Nature News report
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As Richard Black, Microsoft Research Partner Research Manager, wrote in the February 18, 2026 update: “We have unlocked the science for parallel high-speed writing and developed a technique to permit accelerated aging tests on the written glass, suggesting that the data should remain intact for at least 10,000 years.”
How much data can a glass plate hold?
Microsoft’s current Project Silica overview says a square glass platter about the size of a DVD can hold raw capacity “upwards of 7TB.” The overview does not establish that figure as the capacity of the specific 2026 borosilicate demonstration. Microsoft’s 2026 update describes hundreds of data layers in glass only 2 mm thick but does not give a per-platter capacity for that demonstration. Microsoft Research project overview · 2026 update
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Microsoft also says the system’s aggregate write throughput can be comparable to current archival systems. The sources do not provide a quantitative head-to-head throughput or cost comparison, so this claim does not establish that Silica is faster or cheaper than a particular tape or disk system.
Can I buy a Project Silica glass plate?
No retail plate, compatible writer or reader, or commercially available Project Silica storage service is established by Microsoft’s current update. Microsoft says the research phase is complete and that it is considering what it learned while exploring the ongoing need for sustainable long-term digital preservation. That is not an announcement of a product launch or service. Microsoft Research’s February 2026 update
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Microsoft lists demonstrations and collaborations including storing Warner Bros.’ “Superman” film on quartz glass, work with Global Music Vault on long-term music preservation, and a student “Golden Record 2.0” project for images, sounds, music and spoken language. These examples show research and preservation projects; they do not mean customers can order the system.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Could glass replace hard drives or tape?
Project Silica is aimed at archival storage: information that needs to be kept for long periods but is not constantly changed or accessed. It is not presented as a replacement for everyday computer storage. Microsoft’s rationale is that durable media could reduce repeated copying as storage media generations change.
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- PATENTED INORGANIC RECORDING LAYER: Data is engraved into the disc’s recording layer instead of being stored with traditional organic dyes that can deteriorate.
- ENVIRONMENTAL RESISTANCE: Archival-grade construction helps protect stored data against exposure to light, temperature, and humidity.
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Whether it makes sense alongside tape or disk depends on practical factors that the available project descriptions do not settle in a quantitative comparison:
- Lifetime evidence: Silica’s headline durability is an accelerated-aging estimate; a buyer would need to compare evidence and operating assumptions across systems.
- Capacity and throughput: Microsoft publishes a raw-capacity figure for its overview and describes throughput as comparable to current archival systems, but does not provide a complete head-to-head benchmark here.
- Total system cost and availability: No commercial Silica pricing or generally available hardware is established.
- Energy and refresh work: Microsoft says reading requires far less energy than writing and argues that longer-lived media could reduce periodic migration. That does not by itself quantify total lifecycle energy or labor savings.
- Future compatibility: Long-lasting physical media still need working readers, decoders, formats and preserved context so future users can interpret the data. Microsoft’s reviewed descriptions explain the encoding and decoding system but do not quantify how much long-term effort those dependencies will require.
Microsoft says glass is resistant to water, heat and dust and that optical reading cannot modify the data. Those are project claims about the medium and system, not a substitute for an independently established, commercially supported archive.
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