This does not concern Windows 10 a priori but it is sufficiently important to be mentionned.
ARMONK, N.Y. 08 Mar 2017:
IBM today announced it has created the world's smallest magnet using a single atom – and stored one bit of data on it.
Currently, hard disk drives use about 100,000 atoms to store a single bit.
The ability to read and write one bit on one atom creates new possibilities for developing significantly smaller and denser storage devices, that could someday, for example, enable storing the entire iTunes library of 35 million songs on a device the size of a credit card.
A view from IBM Research's Nobel prize-winning microscope of a single atom of Holmium, an element used as a magnet to store one bit of data. Photo credit: IBM Research - Almaden (San Jose, Calif.)