Back in September 2004, I wrote about perpendicular storage, in my piece, Terabytes To Go as part of Business 2.0 story: Seven Technologies That Change Everything. “Today’s hard drives store bits of data horizontally, like stalks of freshly cut corn. PMR stores them vertically, like cornstalks standing in a field. With perpendicular storage, each bit occupies less space on the surface of the disc, so more data can be stuffed into a smaller area.” Hitachi today announced that it can cram 230 gigabytes in a inch thick drive that uses PMR. Terabit drives for PC in a couple of years, they say!