Magnetic disk apparatus, magnetic recording medium and method of servo waiting
OwnerFutoshi Tomiyama, Takehiko Hamaguchi +1inventors
InventorsFutoshi Tomiyama, Takehiko Hamaguchi, Atsushi Kikugawa
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Abstract
There is provided a magnetic disk apparatus incorporating a perpendicular recording medium that employs a servo information writing method which is less likely to cause servo errors. A magnetic disk apparatus incorporates a recording medium whose servo areas are so designed that there is at least one point having no servo sector, on the line connecting the recording medium pivot and an arbitrary point on the outermost track of the medium, in a system which satisfies the relation of B×N>2π where B represents the angle of the area (sector) occupied by the locus of a servo pattern with respect to the recording medium pivot and N represents the number of servo samples.
Claims19
A magnetic disk apparatus comprising:
- a magnetic recording medium on which tracks having servo areas are formed;
- a magnetic head which incorporates a write element and a read element;
- and
- a rotary actuator,
- wherein said servo areas are divided into a plurality of zones in the radial direction.
A magnetic disk apparatus comprising:
- a magnetic recording medium on which tracks having servo areas are formed;
- a magnetic head including a write element and read element;
- a rotary actuator;
- N servo areas on the magnetic recording medium;
- a distance represented by D that is between a center of the magnetic recording medium and a pivot of the rotary actuator,
- a distance represented by L that is between the pivot of the rotary actuator and a center of the write element or the read element,
- a distance represented by R that is between a position of the magnetic head on a track and the center of the magnetic recording medium,
- a radius of the innermost track of the magnetic recording medium represented by Rin, and
- a radius of the outermost track of the magnetic recording medium represented by Rout,
- wherein the number of servo areas N and angle A formed by the rotary actuator pivot, the center of the magnetic recording medium and the head position on the track satisfy following formula:
- N×(Amax−Amin)>2π
- where the Amax and the Amin represent the maximum and minimum values of angle A within the range of Rin and Rout, respectively, and wherein A is defined by the following formula:
- A=arccos [(R2+D2−L2)/(2×R×D)], and
- wherein at least one straight line connecting the center of the magnetic recording medium and arbitrary point in Rout on the magnetic recording medium does not intersect any servo area.
A magnetic disk apparatus comprising:
- a magnetic recording medium on which tracks having servo areas are formed;
- a magnetic head which incorporates a write element and a read element;
- and
- a rotary actuator,
- N servo areas on the magnetic recording medium;
- a distance represented by D that is between a center of the magnetic recording medium and a pivot of the rotary actuator,
- a distance represented by L that is between the pivot of the rotary actuator and a center of the write element or the read element,
- a distance represented by R that is between a position of the magnetic head on a track and the center of the magnetic recording medium,
- a radius of the innermost track of the magnetic recording medium represented by Rin, and
- a radius of the outermost track of the magnetic recording medium represented by Rout, wherein
- wherein the number of servo areas N and angle A of formed by the rotary actuator pivot, the center of the magnetic recording medium and the head position on the track satisfy following formula:
- N×(Amax−Amin)>2π
- where the Amax and the Amin represent the maximum and minimum values of angle A within the range of Rin and Rout, respectively, and wherein A is defined by the following formula:
- A=arccos [(R2+D2−L2)/(2×R×D)], and
- wherein under an assumption that a first straight line connecting the center of the magnetic recording medium and a first arbitrary point on the track corresponding to Rout,
- a second straight line 2 connecting the center of the magnetic recording medium and a second arbitrary point on the track corresponding to Rout,
- angle C formed by said first straight line and said second straight line, and
- said first arbitrary point and said second arbitrary point are selected in a way satisfying following formula,
- C<2π/N,
- only one servo sector for each track exists within the area formed by said first straight line, said second straight line and Rout.
Dependencies are inferred from the claim text.