Magnetic disk drive
AssigneeKabushiki Kaisha Toshiba
InventorsShigeru Kakekado, Tetsuo Inoue
Life of this patent
Estimating the term…
Abstract
A magnetic disk drive according to the invention is comprises a rotary magnetic disk, a magnetic head having a head slider arranged oppositely to the magnetic disk and a transducer supported by the head slider for performing recording/reproducing information to and from the magnetic disk, and voltage applying section for applying a voltage across the head slider and the magnetic disk in accordance with at least one of a track position on the magnetic disk in which the magnetic head is positioned and the operation mode of the magnetic disk drive.
Claims13
A magnet disk drive comprising:
- a magnetic disk;
- a motor configured to rotate said magnetic disk with a predetermined rotational angle speed of ω;
- a magnetic head having a head slider arranged oppositely to said magnetic disk and a transducer supported by said head slider for performing recording/reproducing information to and from said magnetic disk;
- positioning means for moving said magnetic head between an innermost track and an outermost track to position said magnetic head;
- voltage apply means for applying a voltage between said magnetic disk and said magnetic head to adjust a flying height to 100 nm or lower by an electrostatic force during an operation;
- and
- an insulating layer comprising a dielectric insulator and provided on at least either one of opposed surfaces of said magnetic disk and said head slider, wherein
- an upper limit of a voltage of the applied voltage is 3×(ωR)½ (R:
- outer diameter of said magnetic disk).
A magnetic disk drive comprising:
- a magnetic disk;
- a motor configured to rotate said magnetic disk with a predetermined rotational angle speed of ω (1/s);
- a magnetic head having a head arranged oppositely to said magnetic disk ad a transducer supported by said head slider for performing recording/reproducing information to and from said magnetic disk;
- positioning means for moving said magnetic head between an innermost track and an outermost track to position said magnetic head;
- voltage apply means for applying a voltage between said magnetic disk and said magnetic head to adjust a flying height to 100 nm or lower by an electrostatic force during an operation;
- control means for controlling said applied voltage;
- flying height detecting means for detecting the flying height of said magnetic head from said magnetic disk;
- and
- an insulating layer comprising a dielectric insulator and provided on at least either one of opposed surfaces of said magnetic disk and said head slider, wherein
- said control means controls said applied voltage so that a flying height detected by said flying height detecting means is kept to a predetermined flying height, and
- an upper limit of a voltage of the applied voltage is 3×(ωR½(R:
- outer diameter of said magnet disk).
Dependencies are inferred from the claim text.