Hitachi Foresees Huge Hard Drives in Near Future

The feat, which Hitachi presented Monday at the Perpendicular Magnetic Recording Conference in Tokyo, revisits a technology known as giant magnetoresistance, or GMR, that was the basis of the work of two European scientists who won the Nobel Prize in physics last week.

A hard drive has a metal disk inside that spins as an arm with an electromagnetic head at its tip hovers over it. The head reads bits of data by registering the magnetic bearing of the particles on the disk.

Capacities of hard drives have grown as researchers have crammed more bits of data closer together while also making the heads sensitive enough to read the data.

The industry looks to new technologies every time physical limitations kick in, and GMR — which allows for extremely thin layers of alternating metals to detect weak changes in magnetism — was one of the breakthroughs that led to the fastest growth rate in the early 2000s, allowing hard drives to double in capacity every year.

But GMR-based heads maxed out, and the industry replaced the technology in recent years with an entirely different kind of head.

Yet researchers are predicting that technology will soon run into capacity problems, and now GMR is making a comeback as the next-generation successor.

"We changed the direction of the current and adjusted the materials to get good properties," said John Best, chief technologist for Hitachi's data-storage unit.

By doing so, Hitachi said it has created the world's smallest disk drive heads in the 30-nanometer to 50-nanometer range, or about 2,000 times smaller than the width of an average human hair.

Other hard drive companies are working on similar technology as well, Rydning said.

He predicted the entire disk drive industry will begin migrating to this new type of GMR-based technology in 2009.