Scientists at the University of Tokyo have discovered a new compound, titanium pentoxide(Ti3O5), that can be used as optical data storage medium.

They treated the microscopic black crystals in the titanium pentoxide (Ti3O5) compound with laser light and observed that their structure changed in a way that made it difficult to conduct electricity. Hence the conclusion that they can be used as storage medium.

Regarding the gist of the matter..What would be the advantage of using that material instead of germanium or other rare materials used in the current Blu-ray discs, the answer is twofold. First of all, it is considered to be much less costly and can be produced in large quantities. And secondly, it can hold a whole lot more data than Blu-ray discs do. How much? Well, it seems a bit blurry there as Japanese newspaper Mainichi reports as 200 times more whereas the news agency AFP reports as more than 1,000 times more.  In the end of the day, no need to be grumpy, either case it offers a huge lot.