British scientists develop permanent data storage systems

Beijing time on February 8 news, according to physicist organization's website reports, data stored on media such as CD or DVD can generally be stored for decades, after that due to the physical aging of the material will Will damage its saved data. Researchers have been searching for ways to further extend the time of data storage. But for now, even extending this record to 100 years will be a huge challenge. In a recently published study, scientists demonstrated a new type of data storage technology that stores data for an effective period of approximately 3 times 10 in 20-degree years at room temperature, which means that it is almost infinitely long. time. This will create a new field of permanent data storage.

The developers of this technology are Zhang Jingyu, Jingda Zhang, Mindaugas Gecevičius, Martynas Beresna, and Pete at the University of Southampton, UK. · Peter G. Kazansky. Their related research papers have been published in the latest issue of the "Physical Review Letters" recently published.

Zhang Jingyu said: "After 50 years of invention on the Internet, more and more data are being produced in this information age. So, how to store data for a long period of time on the premise of considering the physical aging of materials has become a widely-received technology. Many individuals, companies, and government agencies are interested in permanent data storage technology and hope to apply it to the military, science, and security fields. Currently, products in the market can see that this area has achieved some Progress, Hitachi, Japan has also developed a product that can store data for many millions of years. And we believe that this time we are offering the ultimate solution to this problem."

Researchers explain that, traditionally, there is a trade-off relationship between data storage and lifespan and capacity, so storage media that can store large amounts of information tend to have shorter life spans. For instance, physicists have demonstrated a technique that can use a single atom to store huge amounts of information. However, at room temperature, the storage medium needs only about 10 picoseconds (1 picosecond = 1 trillion second).

The solution given by this researcher has solved this contradiction perfectly. It has both long life and huge capacity. In storing data, a femtosecond laser emits ultrashort-wavelength laser pulses to irradiate the quartz crystal. In this way, the laser will generate nanoscale dots in the crystal, each of which carries 3 bits of information. The reason why each small point can carry 3 bits of information is because the laser pulse adopts a multi-layer coding method. That is, each small point contains three different micro-layer structures, in which the intensity of the incident laser pulse is recorded. And polarization. Using this technology, a CD or DVD-sized disc, assuming it has 1000 recording layers, will have a data storage capacity of several hundred TB, which is a very impressive number.

Next examine the longevity of this storage system. The degenerate core mechanism of this storage system is the collapse of the nanovoids between their nanogrids. Once these nanovoids collapse, the data stored in the grid structure will become unstable and appear to be lost.

The researchers calculated the time when the grid system was degraded. The result of this calculation is the lifetime of the data storage system. As a result of the calculation, the life time at room temperature is about 3 times 10 times 20th power. This shows its unparalleled superior performance. With the increase of the ambient temperature, the service life of the system will be reduced correspondingly, but even at an ultra-high temperature of 189 degrees Celsius, its lifetime is still as high as about 13.8 billion years, which is already equal to the age of our universe.

The principle of the optical storage system developed by researchers has been similar to this technology, but its disadvantage is that its data writing process is too slow, so that it has no practical value in the real world. This newly developed method will increase the data writing speed by two orders of magnitude compared to the past.

In the future, researchers hope to further improve the performance of the system, for example, by increasing the number of polarization states or energy levels of the incident laser pulses to achieve the purpose of increasing its storage capacity. They also intend to further increase the data writing speed of the system, from the current approximately 6KB per second to 120MB per second. (morning)

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