| US 7,573,666 B2 | ||
| Optimizing storage capacity by smoothly varying track pitch across a disk surface | ||
| Peter Raymond, Erie, Colo. (US) | ||
| Assigned to ESGW Holdings Limited, Tortola (Virgin Islands (British)) | ||
| Filed on Oct. 10, 2007, as Appl. No. 11/973,752. | ||
| Prior Publication US 2009/0097154 A1, Apr. 16, 2009 | ||
| Int. Cl. G11B 5/09 (2006.01) | ||
| U.S. Cl. 360—48 | 23 Claims |
| 13. A hard disk drive including a plurality of rotatable hard disks and a plurality of actuator mounted read/write heads,
each of said read/write heads capable of writing data on an associated disk, comprising:
the plurality of disks, each disk being formatted with a radial array of concentric and substantially annular servo tracks
having a servo track pitch and a servo track width; wherein
said servo track pitch and said servo track width may vary radially and wherein
each of said servo tracks has a servo track location, denoted STL; and wherein
data is written within a plurality of data tracks formed within a data track band, and wherein each of said data tracks has
a data track pitch and a data track width and is specified by a data track number DTN; and wherein,
said data track pitch and width are smoothly variable radially and wherein
STL and DTN are numerically related by a smooth and continuous function, whereby,
there is obtained a smoothly variable data track pitch per servo track.
|