Hitachi developes world's smallest read-head technology for hard disks; result may be 4-terabyte drives
Disk drive technology marches on. We take it for granted. But there is some serious science behind it all and Hitachi is showing some off today. The Japanese company is announcing …
Context & Ripple Effects
Hitachi's announcement lands mid-race: since the first terabyte-class laptop drives were flagged in mid-2006, capacity records have fallen steadily, including Toshiba's 320GB 2.5-inch laptop drive this August. The bottleneck in that race is the read head — shrink it and you can pack more bits per platter.
Hitachi's confirmed claim is a nanotechnology breakthrough producing the world's smallest read-write head, with a stated path to single 4TB drives by 2011. It sits alongside other parallel bets in the corpus, including July's laser-assisted recording demonstration and September's drives pairing large capacities with 1GB+ DDR RAM caches — evidence that vendors are attacking the density problem from several directions at once.
First-order effects
- Hitachi takes the lead in the areal-density contest, forcing rivals like Toshiba — holder of the current 2.5-inch capacity record — to answer with their own head or media advances rather than incremental platter counts.
- Drive buyers get a credible roadmap to 4TB single units by 2011, which changes procurement math for anyone archiving video or bulk data who had assumed multi-drive arrays would be required.
Second-order effects
- Higher-capacity spindles raise the value of the cache-and-controller layer around them, reinforcing the direction shown by the DDR-RAM-cache designs and pushing component suppliers toward bigger buffers and faster interfaces.
- Laptop makers gain headroom to keep shipping spinning-disk options with desktop-class capacities, letting them hold the line on price per gigabyte against any alternative storage formats.
Third-order effects
- If head-shrinking, laser-assisted recording, and cache-heavy architectures all mature, the industry's density curve extends well past the terabyte era on magnetic disks alone, deferring any forced migration to fundamentally different storage media through at least the end of the decade.
The trend: Hard-drive makers are competing on ever-smaller read heads and new recording physics to sustain areal-density scaling, keeping spinning disks on the terabyte-era capacity curve into the next decade.