Radially offset writer position control in a disc drive made with substantially identical heads
AssigneeJPMorgan Chase Bank
InventorsLawrence Matthias Bryant, Karl Arnold Belser, Robert Dale Murphy
Life of this patent
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Abstract
A method and apparatus for reading and writing data from and to a data storage disc in a data storage device. The data storage disc includes a first disc surface and second disc surface for storing data. The data storage device includes an actuator assembly configured to selectively position a first transducer over the first disc surface and a second transducer over the second disc surface, wherein the first transducer is substantially identical to the second transducer. Furthermore, each transducer includes a read element and a write element, wherein the read element is offset from the write element by at least the width of one servo track.
Claims16
A method of making a disc drive comprising a disc having a center axis, the method comprising steps of:
- (a) making a first head having a first read element and a first write element;
- (b) making a second head substantially identical with the first head, the second head having a second read element and a second write element;
- (c) supporting the first head with a first actuator arm so that the first read and write elements have respective offset distances R1 and W1 from the center axis so that |R1−W1|>D>0 while the first head is positioned adjacent the disc, where D is equal to a typical servo track width;
- (d) supporting the second head with a second actuator arm so that the second read and write elements have respective offset distances R2 and W2 from the center axis so that |R2−W2|>D>0 while the second head is positioned adjacent the disc;
- and
- (e) during one rotation of the disc, controlling the motion of the first write element with a signal received from the first read element.
A disc drive comprising:
- a disc having a center axis;
- at least a first and a second substantially identical heads;
- and
- means for supporting the heads so that a write element and a read element of each of the heads are not equally offset from the center axis whenever data is written to the disc.
A method for writing servo tracks on a data storage disc, the data storage disc having a first disc surface and a second disc surface, wherein the first disc surface and the second disc surface are bounded by an inner diameter and an outer diameter, the method comprising steps of:
- (a) propagating a first servo seed track pattern radially along the first disc surface from a first start position to a first end position in a first direction;
- and
- (b) propagating a second servo seed track pattern along the second disc surface from a second start position to a second end position in a second direction opposite to the first direction.
Dependencies are inferred from the claim text.