Patent ID: 7573666
Filing Date: 2009-08-11
Classification: G11B

Abstract:
1. A method for smoothly varying the ratio of servo track pitch to data track pitch on the surface of a magnetic disk while data is being written to said disk, comprising: providing a hard disk drive on which can be rotatably mounted at least one fixed media hard disk, said hard disk drive including at least one read/write head distally mounted on a pivotable actuator of fixed length and capable of reading and writing data on said disk; formatting said disk with a radial distribution of concentric servo tracks, said servo tracks having a width and a pitch that may vary radially across the surface of said disk and each of said servo tracks having a servo track location, STL; writing data within a data track specified by a data track number, DTN; wherein STL and DTN are numerically related by a smooth and continuous function and whereby there results a radially variable data track pitch per servo track.