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US 2003/0197964 A1Published application
Disk device and disk medium
AssigneeFujitsu Limited
InventorsHiroshi Ashikaga, Nobuyuki Suzuki
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AssigneeFujitsu Limited
InventorsHiroshi Ashikaga, Nobuyuki Suzuki
Estimating the term…
A disk device and a disk medium are disclosed in which a plurality of servo cylinders on the surface of at least one disk are divided into several areas, and a different servo signal frequency is set and recorded for each of the areas. The servo cylinders are divided into predetermined areas, and a different servo signal frequency for each of the areas is set so that the recording density of the servo signal recorded in the disk can be set so as to allow the servo signal demodulation characteristic to be included in a relatively superior range. In the disk device, the boundary between the area of a first servo signal frequency and the area of a second servo signal frequency adjoining the first servo signal frequency area is preferably formed with an area in which a servo signal pattern written with the first servo signal frequency and a servo signal pattern written with the second servo signal frequency are arranged on the same servo cylinders.
A disk device in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and a servo signal pattern corresponding to the servo signal frequency set for each of said areas is formed in each of said areas, and the servo signal frequency set for each of said areas is stored in advance,
A disk device in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and a servo signal pattern corresponding to the servo signal frequency set for each of said areas is formed in each of said areas, and the servo signal frequency set for each of said areas is stored in advance,
A disk device in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and a servo signal pattern corresponding to the servo signal frequency set for each of said areas is formed in each of said areas, and the servo signal frequency set for each of said areas is stored in advance,
A disk device in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk are divided into predetermined areas, and different central servo signal frequencies are set for the divided predetermined areas, respectively, and a servo signal pattern corresponding to the central servo signal frequency set for each of said areas is arranged in each of said areas, and the central servo signal frequency set for each of said areas is stored in advance,
A disk device in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk are divided into several areas, and different servo signal frequencies are set for different areas thus divided, respectively, and the servo signal pattern of a servo signal frequency set for each of said areas is formed in each of said areas, and the servo signal patterns written with a single servo signal frequency from the inner diametrical portion to the outer diametrical portion of said disk are formed on the same servo cylinders.
A disk medium in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of the surface of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and the servo signal pattern of the servo signal frequency set for each of said areas is formed in each of said areas,
A disk medium in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of the surface of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and the servo signal pattern of the servo signal frequency set for each of said areas is formed in each of said areas,
A disk medium in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of the surface of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and a servo signal pattern of the servo signal frequency set for each of said areas is formed in each of said areas,
A disk medium in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of the surface of at least one disk are divided into predetermined areas, and different central servo signal frequencies are set for the divided predetermined areas, respectively,
A disk medium in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of the surface of at least one disk are divided into several areas, and different servo signal frequencies are set for different areas thus divided, respectively, and a servo signal pattern of the servo signal frequency set for each of said areas is formed in each of said areas, and the servo signal patterns written with a single servo signal frequency from the inner diametrical portion to the outer diametrical portion of said disk are formed on the same servo cylinders.
Dependencies are inferred from the claim text.
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Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing…: on disks
For track following on disks: servo formatting
Information storage based on relative movement between record carrier and transducer
Term end not estimated
1. Field of the Invention
The present invention relates to a disk device, and a disk medium, in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk, such as a magnetic disk, are divided into several areas, and a different servo signal frequency is set for each of these areas and recorded in advance.
A disk rotatably set on a disk device, such as a magnetic disk device, may be removable from the disk device as in the case in which it is used as a single sheet of a disk of servo track writer (STW). In such a case, the disk may be shipped independently with servo signal patterns written in the servo cylinders. This disk (or a plurality of disks) is generally called “a disk medium” (or “disk media”).
The above object and features of the present invention will be more apparent from the following description of the preferred embodiments with reference to the accompanying drawings, wherein:
FIG. 1 is a schematic diagram showing an example of an arrangement of conventional servo signal patterns;
FIG. 2 is a diagram showing the relationship between magnetization reversal patterns of the servo signal recorded with a predetermined servo signal frequency and the reproduced servo signal waveforms;
The configurations and the operations of preferred embodiments of the present invention will be explained below, with reference to the accompanying drawings (FIGS. 7 to 38).
FIG. 7 is a plan view showing a schematic configuration of the mechanism section of a disk device according to an embodiment of the present invention; FIG. 8 is a front view showing a schematic configuration of the mechanism section of the disk device according to the same embodiment; and FIG. 9 is a block diagram showing the configuration of the control unit of the disk device according to the same embodiment.
A disk device 1, such as a magnetic disk device, for writing and reading the data into and from a rotating disk (or a disk medium) 2, such as a hard disk, is illustrated as a disk device according to the present invention. Further, FIGS. 7 and 8 show the mechanism section of the disk device 1 according to various embodiments of the present invention, as described later, and FIG. 9 shows a control unit for controlling the operation of the disk device 1. In the description that follows, all the component elements similar or identical to those described above will be designated by the same reference numerals, respectively.