Microsoft’s Millennia-Long Data Storage Breakthrough: Project Silica's Glass Revolution

A breakthrough from Microsoft Research promises to preserve humanity’s archives for 10,000 years—could this be the permanent medium for our digital legacy?

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1. The Science Behind Project Silica: Glass as a Data Medium

In February 2026, Microsoft Research announced Project Silica—a novel archival storage technology that encodes data into glass using ultrafast femtosecond laser pulses, creating three-dimensional data voxels resilient to environmental degradation . The team demonstrated that a 120 mm-square, 2 mm-thick borosilicate glass plate can store approximately 4.8 to 5 TB of data—equivalent to about two million printed books or 5,000 ultra‑high-definition 4K films . Accelerated aging tests suggest that the data remains readable for at least 10,000 years at room temperature .

2. Technical Capabilities and Limitations

Project Silica achieves data densities exceeding a gigabit per cubic millimeter by encoding information via voxel birefringence and refractive index changes, using phase‑contrast microscopy for readout . The writing speed currently reaches around 66 Mbit/s per slab using multiple lasers, though full writing of a slab could take over 150 hours . While writing remains a bottleneck, the absence of energy requirements for data preservation and rapid retrieval capability make it highly attractive for cold archival storage .