Microsoft Project Silica: Your Data, Stored in a Pyrex Dish, for 10,000 Years

Microsoft's Project Silica encodes data in borosilicate glass using femtosecond lasers, offering long-term storage for up to 10,000 years. This method overcomes traditional storage limitations and is cost-effective, though write speed remains a challenge. The research phase is complete, but no product release has been announced.

The Problem With How We Store Everything

Every byte of human knowledge stored today is on borrowed time. According to Microsoft Research, magnetic tapes and hard drives degrade within decades - making them far from ideal for preserving information for future generations. And as Semafor notes, with the rise of AI and the explosion of data it depends on, current methods are simply unsustainable.

Microsoft's answer is glass. Not exotic glass - the same borosilicate material in your kitchen cookware and oven door.

What Just Happened

On February 18, 2026, Microsoft Research published a breakthrough paper in Nature on Project Silica, its decade-long effort to encode data in glass using femtosecond lasers. The headline advance, per Microsoft Research's blog: the technology now works with ordinary borosilicate glass - not just expensive, hard-to-source fused silica - directly addressing the two biggest barriers to commercialization: cost and availability of storage media.

According to Windows Central, the project was founded in 2019. This is its first major public update in half a decade, and it lands in Nature - the most prestigious scientific journal in the world.

How It Works

The system encodes data as microscopic 3D structures called voxels - think pixels, but buried inside a solid piece of glass using a femtosecond laser. This generation introduces two distinct methods:

Birefringent voxels - the original method - work by changing how glass interacts with polarized light. They deliver higher storage density but require expensive, high-purity fused silica.

Phase voxels - the new invention - are the real breakthrough. According to Tom's Hardware, phase voxels modify the local refractive index of the glass, creating phase shifts in transmitted light. Critically, each phase voxel requires only a single femtosecond laser pulse - simpler, faster, and compatible with borosilicate glass.

As Gizmodo explains, the remaining technical challenges now lie mostly with the femtosecond lasers themselves - not the glass, not the encoding method. According to Richard Black, Project Silica's director at Microsoft Research Cambridge: "One of the things that we've done with our research is effectively we have removed all of the scientific challenges - now, it's only about the laser."

The Numbers

According to Tom's Hardware, the borosilicate system achieves:

• 2.02 TB per 120mm × 120mm × 2mm glass plate, across 258 layers
• 0.678 Gbit/mm³ storage density
• 18.4 Mbit/s write throughput per beam
• 65.9 Mbit/s with four parallel beams, without inducing thermal damage
• Writing with 16 or more beams is projected to reach 263.6 Mbit/s

The fused silica method, by comparison, stores 4.84 TB per plate at higher density - but requires glass available from only a few specialized manufacturers worldwide.

Reading hardware has also been simplified. Per Microsoft Research, the reader now requires only one camera, not three or four - reducing both cost and physical footprint.

Why Glass Lasts

According to Gizmodo, Peter Kazansky, an optical physicist at the University of Southampton who was not involved in the research, framed the stakes plainly: "Our current records are kept on fragile magnetic platters that are constantly decaying; this research ensures our digital heritage becomes permanent."

Glass is resistant to water, heat, dust, and magnetic interference. Microsoft validated longevity using accelerated aging tests - simulating millennia of decay at elevated temperatures. Per Blocks & Files, the researchers concluded: "We demonstrate that Silica is a viable storage system by fully recovering user data using FEC, and show through accelerated aging experiments that our modifications last more than 10,000 years at room temperature."

Richard Black puts the economics simply, via Gizmodo: "You can write the data into the glass, and then once it's done, then it's done - there's no ongoing cost."

What It's Good For - and What It Isn't

According to New Atlas, the potential applications include medical, industrial, and scientific data, archiving the web, AI training datasets, and media libraries from publishers of film, music, and literature.

But write speed remains the critical constraint. As Blocks & Files points out, even at 65.9 Mbit/s with four beams, filling a 2 TB borosilicate plate would take roughly 70 hours. For context, LTO-10 tape writes at 400 MB/s uncompressed - nearly 50× faster. Project Silica is strictly a write-once, read-rarely medium. It is not a replacement for tape in active archival workflows - not yet.

Microsoft has also not made a choice on which voxel type to productize. Per Blocks & Files, the researchers stated explicitly: "A key system choice for a future Silica system is whether to use birefringent or phase voxels." They make no recommendation - leaving the core architectural decision open.

The Bottom Line

According to Microsoft Research, the research phase is now complete. The blog post announcing the Nature paper says so directly - without announcing a product, a price, or a shipping timeline.

What Project Silica has delivered is a proof of concept that is now scientifically credible and materially practical. The move to borosilicate glass removes the supply-chain and cost barriers that blocked the previous generation. Phase voxels simplify the hardware stack to the point where, per Gizmodo, Kazansky called it a "pragmatic engineering choice" with "a clear path toward industrial throughput."

Whether that path leads to a datacenter near you - or stays a research milestone - is a question Microsoft has not yet answered.

• https://www.microsoft.com/en-us/research/blog/proj...
• https://www.nature.com/articles/s41586-025-10042-w...