The tests of time, enemies of data on optical discs (CD, DVD, Blu-ray, etc.).
To the point that they have never been considered as valid media for storing information.
Little by little, CD and DVD players disappeared from most home computers, and they never found their place in data centers.
In contrast, modern flash drives and hard drives remain more popular formats.
Laser technology as a solution
Laboratories are constantly looking for solutions to keep the largest volumes of data as long as possible.
The latest news is that investing in laser technology would be the smart move to improve data storage and preservation.
5D is the solution devised by researchers at the University of Southampton, UK.
This new optical storage system would burn 500 terabytes of data onto a single CD-sized glass disc, or the equivalent of 125,000,000 photos.
A density 10,000 times greater than that found on a Blue Ray disc.
We can then imagine a sort of digital safe, capable of housing historical archives over a period of time almost as old as the Big Bang.
The storage medium would be durable, even eternal.
The disc could withstand temperatures of up to 1,000 degrees.
If stored in good condition, its longevity would be 13.8 billion years, without degradation.
Writing data in "5D"
This new technique challenges the speed of writing data, one of the main problems of traditional optical storage.
Project scientists claim to have succeeded in revolutionizing this writing speed, without affecting the reliability of the information.
To accomplish these feats, the laboratory has focused on writing storage cells based on nanostructures.
The team talks about five-dimensional (5D) laser-written structures.
This type of storage, at the nanoscale, writes data in three layers of dots on a glass disc.
There are therefore two optical dimensions and three other spatial dimensions.
The size, orientation and 3D position of the points give rise to five dimensions which are interpreted when encoding and reading data.
An ultra-resistant disc
The researchers therefore found a way to speed up the writing of data without damaging the glass disc.
On the write speed side, the laser peaks at 230 kb / s.
More clearly, it would take around 60 days to back up that 500TB of data.
Not very fast, but since it concerns long-term storage, the speed of the gravure printing is not necessarily a priority.
Indeed, researchers claim that a 5D disc could still be readable after 13.8 billion years, without loss of information.
This type of support is therefore more resistant to scratches and more resistant to high temperatures.
For example, it can remain unaltered up to 1,000 degrees.
An experimental record
Even though the writing speed on this type of disc has increased, it is still much lower than that of other formats.
Moreover, recovering this information intended to be stored on this medium for thousands of years, is not a simple thing.
The maneuver is impossible without a microscope and a polarizer.
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