Could a Small Glass Square Be the Future of Data Storage?
Researchers have developed a new way to store digital information inside ordinary glass, potentially creating a storage medium that could last thousands of years. The system, called Silica, was created by scientists at Microsoft Research and can encode vast amounts of data into a small piece of glass about the size of a coaster. Tests suggest the stored information could remain readable for more than 10,000 years, far longer than traditional storage devices.
Writing data with ultrafast lasers
The technology works by firing extremely short bursts of laser light, known as femtosecond pulses, into the glass. These pulses last only quadrillionths of a second and can alter the structure of the glass at very precise locations. By focusing the laser inside the material, researchers create microscopic points where the glass structure changes. Each tiny modified region, often called a voxel, represents stored information. Because these changes occur deep inside the glass, data can be stored in multiple layers, dramatically increasing storage density.
Building on decades of research
The idea of storing information in glass is not entirely new. Scientists have been exploring laser-written data storage since the 1990s, when researchers demonstrated that femtosecond lasers could permanently modify glass to hold information. Later work showed that glass-based data structures might remain stable for extremely long periods, leading to the concept of ultra-durable archival memory.
A full storage system
What makes the Silica project notable is that it demonstrates a complete storage system. The researchers combined data encoding, laser writing, reading methods and error correction into a single platform designed for practical use. Two different types of microscopic structures can be written into the glass. One method creates tiny voids produced by miniature laser-induced explosions, enabling very dense data storage. Another approach slightly changes how the glass bends light, which can be written more quickly but stores less data per volume.
Why glass storage matters
Conventional storage technologies such as magnetic tapes and hard drives degrade over time and must be replaced regularly. Glass storage could avoid this problem because the data remains stable even in harsh conditions like heat, moisture or dust. Although the system is still under development, researchers believe advances in ultrafast laser technology could make glass-based storage a practical solution for long-term archives. As the world generates ever-growing amounts of digital information, such durable storage methods may become increasingly valuable.
Publication details
Laser writing in glass for dense, fast and efficient archival data storage, Nature (2026). DOI: 10.1038/s41586-025-10042-w
