The femtosecond laser encodes information in five dimensions. The first three dimensions of X, Y and Z denote the nano-grating’s location within the coin, while the 4th and 5th dimension exist on the birefringence patterns of the nano-gratings.
Sourced through Scoop.it from: searchstorage.techtarget.com
By Rich Castagna. No idea what he’s talking about, but 320 TB on a disk the size of a quarter is not bad 😉