Microsoft's New 10,000-Year Data Storage Medium: Glass (arstechnica.com)
The system writes data by firing laser pulses lasting just 10^-15 seconds to create tiny features called voxels inside the glass, each capable of storing more than one bit, and reads it back using phase contrast microscopy paired with a convolutional neural network trained to interpret the images. Writing remains the main bottleneck -- four lasers operating simultaneously achieve 66 megabits per second, meaning a full slab would take over 150 hours to write, though the team believes adding more lasers is feasible.
[1] https://www.nature.com/articles/s41586-025-10042-w
[2] https://arstechnica.com/science/2026/02/microsofts-new-10000-year-data-storage-medium-glass/