Shenzhen Team Unveils DNA Cassette Tape Holding 36PB for 20,000 Years

A team in Shenzhen, China, created a “DNA cassette tape” that can hold up to 36 petabytes of data on 100 meters of polymer tape—roughly 1.5 million times more than a typical smartphone—and keep it intact for up to 20,000 years if stored frozen youtube +1. The prototype, described this fall in the journal Science Advances, points to a radically denser, longer‑lived alternative to magnetic tape and hard drives for archiving the world’s exploding data theverge.

The system stores a digital file—so far, a 156‑kilobyte image—by encoding its 0s and 1s into synthetic DNA strands, then printing those strands onto a nylon‑polyester strip arranged in cassette‑like reels youtube +1. Researchers say the approach could someday condense entire data centers into a handful of cartridges.

How a DNA “Mixtape” Stores Petabytes

Led by J. Li and Xingyu Jiang at Southern University of Science and Technology, the team converts digital data into sequences of the four DNA bases (A, T, C, G), synthesizes those strands as a liquid, and deposits them into microscopic “white space” patches printed along the tape theverge +1. Each patch acts like a high‑density storage block, while printed barcodes beside it serve as address labels for rapid indexing.

In tests, the device achieved a theoretical capacity of 36 petabytes per 100 meters—about 362 petabytes per kilometer—by packing DNA into thousands of densely spaced patches 9to5mac +1. For comparison, a modern LTO‑9 magnetic tape holds up to 45 terabytes; one DNA cassette of similar size could therefore replace hundreds to thousands of conventional tapes 9to5mac +1.

Because DNA molecules are chemically stable when dry and cold, simulations and prior experiments suggest the encoded data could survive around 20,000 years in a deep‑freeze and millennia under well‑controlled conditions youtube +1. “DNA cassette tape provides a strategy for fast, compact, large‑scale DNA‑based cold or warm storage,” the authors wrote theverge.

Promise and Limits in the Race to Fix Data Storage

Global data generation is projected to reach hundreds of zettabytes within a decade, straining conventional storage media whose typical lifetimes range from about five years (hard drives) to 30 years (magnetic tape) before migration is required eurogamer +1. DNA, by contrast, can theoretically hold about 215 petabytes in a single gram, and some estimates place the upper bound at 455 exabytes—far beyond any silicon chip eurogamer +1.

Yet the cassette breakthrough remains firmly in the lab. Writing data into DNA is still slow and expensive: current synthesis methods add bases one by one and can take hours to encode megabytes, while reading requires sequencing, which introduces latency and error‑correction overhead youtube +1. A commentary in Nature Nanotechnology this year highlighted “significant latency” and high error rates as key hurdles before DNA storage can compete with electronic media for anything beyond deep archives livescience.

Even so, analysts expect the DNA data storage market to grow from about $150 million in 2025 to more than $44 billion by 2034 as synthesis costs fall and new high‑throughput methods emerge theweek. Early applications are likely to be national archives, scientific repositories, and cultural heritage collections that prize longevity over speed. If the Shenzhen cassette concept scales, a shelf of DNA “mixtapes” could eventually hold not just every song ever recorded—as one report estimated—but a sizable fraction of human knowledge itself forbes +1.