Don't we already do that with optical media ?
Heat the surface before writing data - yep, it's done on CDs, DVDs, HDDVDs and BRDVDs. And probably some other I don't remember right now.
So they are saying that hard discs are about to go optical. To write data we're going to have to wait for a laser to heat the surface and then let a magneto-thingy change polarities on perpendicular nanoscale thingamajigs.
Do they still guarantee sub-10 millisecond write times ? Or are we going to have hard discs rated at 5ms read/150ms write performance ?