Holding a piece of glass the size of a sugar cube and knowing that it holds more data than the average home computer will ever see in its lifetime is a subtly peculiar experience. Scientists have discovered a way to directly carve information into the atomic structure of silica glass using laser light pulses so fast they are measured in femtoseconds.
This is not due to clever compression or some sort of sleight of hand. For comparison, a femtosecond is equivalent to one second to roughly 31 million years. That is the type of number that momentarily stops you.
| Category | Details |
|---|---|
| Technology name | 5D Optical Data Storage (also known as 5D Memory Crystal) |
| Alternative name | Superman Memory Crystal |
| Storage medium | Fused silica (quartz) glass, using femtosecond laser-etched nanostructures |
| Original inventor / lead researcher | Professor Peter Kazansky, Optoelectronics Research Centre, University of Southampton |
| First experimental demonstration | 2013, University of Southampton |
| Commercializing company | SPhotonix (founded 2024, headquartered in Delaware; research facilities in UK and Switzerland) |
| Co-founders | Peter Kazansky (professor) & Ilya Kazansky (entrepreneur, former co-founder & CTO of Statiq) |
| Maximum storage capacity | Up to 360 terabytes on a 5-inch glass disc |
| Estimated data lifespan | ~13.8 billion years at 190°C (the estimated age of the universe) |
| Recent funding raised | $4.5 million (announced 2025) to advance from prototype to field-deployment stage |
| Notable archived items | Human genome; Isaac Asimov’s Foundation trilogy (launched into space); Heroes of Might & Magic III (first video game preserved in 5D crystal) |
| Current write / read speed | 4 MB/s write, 30 MB/s read (target: 500 MB/s within 3–4 years) |
| Target market | Hyperscaler data centers, B2B cold data storage (not consumer market currently) |
| University of Chicago breakthrough | 1mm crystal cube storing terabytes using praseodymium ions in yttrium oxide, led by Prof. Tian Zhong (Pritzker School of Molecular Engineering) |
The technology, known as 5D optical data storage, has been developed seriously over the last ten years at the Optoelectronics Research Centre at the University of Southampton under Professor Peter Kazansky, although its origins date back to experimental work in the mid-1990s. In a sense, the “5D” descriptor sounds like marketing, and it does, but it also captures something genuine.
This method uses the size, orientation, and three-dimensional location of tiny nanostructures within the glass to encode information instead of just the surface of a material like a DVD or hard drive does. Five dimensions. Data is not the only thing stored in the glass. Depending on the reader’s angle and magnification, it can display data at various depth levels.
It seems like the scientific community took a while to take this seriously as it has developed over time. After all, windows are made of glass. It chips. If you drop it incorrectly, it breaks. Until you look at the numbers, it seems almost counterintuitive that glass could be a better data storage medium than the silicon-based systems that have dominated computing for fifty years.
In contrast to magnetic tapes and hard drives, silica glass is chemically inert. It doesn’t oxidize. When exposed to electromagnetic fields, it does not deteriorate. It has an estimated lifespan of five to a hundred years, depending on conditions, and does not gradually deteriorate like a typical optical disc.
Data etched into silica crystal at the proper depth should last for about 13.8 billion years, or the current estimated age of the universe, according to SPhotonix, a company founded in 2024 to commercialize Kazansky’s research. It’s still unclear whether any organization will ever be able to confirm that extraordinary claim. However, even if the actual figure is only 1% of that, it still surpasses all other archival media.
A femtosecond laser, which fires in pulses lasting one quadrillionth of a second, is used in the physical process to produce tiny three-dimensional pixels, or voxels, inside the glass. Because each voxel is birefringent, the direction and polarization of the incoming beam affect how light is refracted.
The system’s binary language is derived from the variation in how light passes through the structure. A defect that is charged appears as a one. A zero indicates an uncharged defect. The glass itself remains unchanged. All it does is encode.
A parallel thread has been pursued by the University of Chicago. Under the direction of assistant professor Tian Zhong, researchers at its Pritzker School of Molecular Engineering recently showed that terabytes of data could fit into a crystal cube that is only one millimeter across. Their technique entails adding rare-earth ions, particularly praseodymium, to a crystal of yttrium oxide and then using ultraviolet laser light to activate them.
The ions release electrons that are trapped in the crystal’s inherent defects, creating a binary storage system that incorporates concepts from both classical computing and quantum physics. According to one researcher, it’s on the interface between quantum and optical storage, and that’s precisely where things tend to get interesting.
When combined, these two research avenues point to something more than gradual advancement. The rate at which the world is producing data is truly unimaginable; according to IDC projections, 394 trillion zettabytes of data will be generated annually by 2028. The existing infrastructure is unable to keep up. Hard drives frequently malfunction.
SSDs are costly and require a lot of power. Even though tape backup is still commonly used in business archiving, it is becoming less and less common. Glass may end up being the material that resolves a crisis of the twenty-first century. Glass is common, ancient, and almost ridiculously ordinary.
SPhotonix has already shown how the technology can be used in practical settings. In an intentional tribute to the Pioneer plaque affixed to the 1972 space probe, Kazansky’s team encoded the entire three-billion-character human genome onto a coin-sized 5D disc in 2024, complete with a visual key explaining how to read it. In partnership with Good Old Games, Heroes of Might & Magic III became the first video game ever preserved in a 5D crystal.
One of these discs was previously used to store a copy of Isaac Asimov’s Foundation trilogy, which was sent into space on Elon Musk’s Tesla Roadster. These could be interpreted as stunts, and in a way they are, but they also serve as examples of resilience in truly harsh circumstances.
Data centers are the target of the commercial pitch. Cold data, or information that can wait ten seconds or longer to be retrieved, makes up between 60 and 80 percent of all data stored worldwide at any given time. records of financial transactions. Archives of medical imaging. legal documents. Currently, a large portion of this data is stored on rotating hard drives, which use electricity, produce heat, and occasionally fail at the worst possible time.
Ilya Kazansky, who co-founded SPhotonix with his father and holds a leadership position there, has maintained that hard drives have dominated the cold storage market due to inertia rather than reason and that the industry has been using the incorrect tool for this specific task for years.
Although whether the economics work out in practice is still up for debate, there is a case to be made that he is correct. At this point, SPhotonix is aiming for write speeds of 4 megabytes per second, which is competitive with nothing, to be honest. Reaching 500 megabytes per second over the course of the next three to four years would put it on par with archival tape. The first read device from the company is anticipated to cost about $6,000. Thirty thousand is the write device. That isn’t a product for consumers. It’s an investment in a data center.
This story has a familiar shape that is difficult to ignore. A science fiction-sounding technology that was created in a university lab is gradually making its way to the market through industry partnerships and startup funding, bringing with it promises of disruption that the industry has never heard of before.
The durability argument, which is genuinely different from anything else available, may be the difference this time. Drives crash; tape corrodes. Theoretically, glass simply remains patient and perfect for a longer period of time than the human species has existed and probably will. Depending on the type of data you’re storing, that may or may not be comforting.
