US 7,430,091 B2
Method and apparatus for improving the performance of a disk drive
Mark Steven Manasse, San Francisco, Calif. (US)
Assigned to Microsoft Corporation, Redmond, Wash. (US)
Filed on Oct. 21, 2005, as Appl. No. 11/256,042.
Prior Publication US 2007/0091500 A1, Apr. 26, 2007
Int. Cl. G11B 5/58 (2006.01); G11B 5/596 (2006.01)
U.S. Cl. 360—77.01  [360/75; 360/78.12] 17 Claims
OG exemplary drawing
 
1. A disk drive comprising:
one or more platters having a plurality of tracks;
a first head associated with associated with a surface of a platter;
a first subsystem that positions said first head;
a second head associated with said surface of said platter for writing on a data sector on said side of said platter;
a second subsystem that positions said second head on the same track as the first head and phased at an angle from the first head based upon a determination of an optimal angular separation as measured from the center of the platter; wherein the optimal angle of separation is determined based upon a rotational speed of said one or more platters and a time that it takes to reduce oscillations during a settle phase to effectively transfer data from said track, whereby the second head is able to write on the same data sector read by said first head before the platter has completed a full revolution.