Scientists at Microsoft’s Cambridge lab have developed a method to store digital data in glass, offering a potential solution for long-term archival that could last for millennia. Unlike conventional storage media such as hard disks and magnetic tape, which require frequent copying due to limited lifespan, laser-written glass offers remarkable durability and stability. The innovation is part of Microsoft’s Project Silica, aiming to preserve critical data including personal photos, medical records, scientific research, and cultural heritage information in a form that is both compact and resilient.
The technology works by encoding data as tiny three-dimensional deformations, known as voxels, within a piece of glass using a femtosecond laser. Each laser pulse produces a single voxel, and by splitting the laser into four independent beams, the system can record data at a speed of 65.9 million bits per second. The glass can contain several hundred layers of these voxels within just 2mm of thickness. In practice, the researchers demonstrated that 4.84 terabytes of data could be stored in a 12 square centimeter piece of fused silica glass, roughly equivalent to the content of two meters of printed books. They have also developed a method for producing voxels in borosilicate glass, the material commonly used for Pyrex, which is more affordable and easier to manufacture.
Reading the data is achieved by sweeping the glass under an automated microscope, capturing images of each layer, which are then decoded using machine learning algorithms. The entire process of writing, reading, and decoding is fully automated, allowing for efficient and low-effort operation. Experiments suggest that the deformations created by the laser are extremely stable, potentially remaining intact for more than 10,000 years at room temperature. While the system is designed for large-scale cloud storage rather than home use, it represents a significant step toward durable and reliable data preservation at an industrial level.
Experts have welcomed the study as a major advancement for long-term digital storage. Melissa Terras, professor of digital cultural heritage at the University of Edinburgh, noted that inert media capable of maintaining information without ongoing maintenance could be highly valuable. However, she also cautioned that challenges remain, such as ensuring the necessary technology and instructions for reading the glass remain accessible in the future, and that significant investment would be required to implement the system at scale. Despite these considerations, Microsoft’s laser-written glass storage offers a promising option for organizations aiming to safeguard critical data against degradation over centuries.
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