China Achieves Mass Production Breakthrough with 360TB Glass Hard Drives

China Achieves Mass Production Breakthrough with 360TB Glass Hard Drives Researchers at Huazhong University of Science and Technology (HUST) have achieved small-scale mass production of glass-based hard drives, a breakthrough that could transform enterprise cold data storage. Each glass disc can store a staggering 360 terabytes of data across 400 stacked layers, using laser "carving" technology that writes data into the internal structure of the glass medium. The technology, developed in collaboration with Wuhan-based startup YiYao Technology, uses femtosecond laser pulses to create microscopic modifications within glass discs, effectively encoding data in three dimensions. The 400-layer stacking capability represents a quantum leap in storage density compared to traditional magnetic hard drives or even solid-state drives. Performance specifications reveal both the technology's strengths and current limitations. Write speeds range between 8 and 10 MB/s, while read speeds reach 50 to 200 MB/s. The drives are write-once media — data cannot be erased or rewritten once stored — making them unsuitable for active storage workloads but ideal for archival and cold storage applications. YiYao Technology was founded in Wuhan and has attracted top talent from the global optical storage community. Notably, a former chief researcher from Microsoft's Project Silica has joined the company as co-founder, bringing invaluable expertise in glass-based data storage — a field Microsoft has researched for years but has yet to commercialize at scale. The target market for these glass drives is enterprise cold data storage, a segment currently dominated by magnetic tape. Tape storage, while inexpensive, suffers from slow access times, mechanical degradation, and limited lifespan. Glass storage offers several compelling advantages: exceptional durability (glass discs are resistant to water, electromagnetic fields, and extreme temperatures), extremely long data retention measured in centuries rather than decades, and higher storage density per physical volume. "If you think about data centers that need to store petabytes of archival data for regulatory compliance or historical preservation, glass storage is a game-changer," said an industry expert familiar with the technology. "The write-once nature is actually a feature for cold storage — it guarantees data integrity over time without risk of accidental deletion or corruption." The HUST and YiYao team are now working to scale production volumes and improve write speeds. While the current 8-10 MB/s write rate is acceptable for archival workflows, faster writing would open additional use cases. The long-term vision includes competing not just with tape but with traditional hard drives for certain nearline storage applications. China's glass storage breakthrough represents a rare convergence of academic research, industry talent, and manufacturing capability — and it positions YiYao Technology at the forefront of what could be the next generation of data storage infrastructure. Tags: Glass Storage, HUST, Data Storage