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Magnetic recording/reproducing device

A reproducing device and magnetic recording technology, applied in digital recording/reproduction, recording/reproduction/deletion method, magnetic recording, etc.

Inactive Publication Date: 2001-02-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the conventional method of recording a pre-format signal using a magnetic head built in a drive, it is impossible to obtain a recording gap arbitrarily inclined with respect to the track width direction.

Method used

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  • Magnetic recording/reproducing device
  • Magnetic recording/reproducing device
  • Magnetic recording/reproducing device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0046] 1 and 2 show an example of a magnetization pattern of a signal that has been preformat-recorded on a magnetic disk installed in a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

[0047] The magnetization patterns in Figures 1 and 2 are recorded by bringing the surface of a magnetic disk into contact with the surface of a master information carrier having the same ferromagnetic film pattern developed on its surface.

[0048] For comparison, FIG. 3 shows an example of a conventional magnetization pattern that has been pre-formatted recorded on a magnetic disk using a dedicated servo track writing device and a magnetic head built into the drive. The schema shown in FIG. 3 corresponds to the schema shown in FIGS. 1 and 2 .

[0049] 1 to 3 show an example of a magnetization pattern in which preformatted signals are recorded in a preformatted area at certain angular intervals along the circumferential direction of, for examp...

no. 2 example

[0058] Figure 4 Shows an example of a magnetization pattern of a signal that has been preformatted recorded on a magnetic disk installed in a magnetic recording / reproducing apparatus according to the second embodiment of the present invention.

[0059] Figure 4 The magnetization pattern shown in is recorded by bringing the surface of a magnetic disk into contact with a master information carrier having the same ferromagnetic film pattern on the surface.

[0060] For comparison, Fig. 5 shows an example of the magnetization pattern of a master information carrier pre-format recording, wherein the recording width along the radial direction is designed to be the same as the magnetic head recording track width 5, as Figure 10 shown in the example. The modes shown in Figure 5 correspond to Figure 4 mode shown.

[0061] Figure 4 FIG. 5 shows a magnetization pattern comprising preformatted signals recorded in a preformatted area arranged at certain angular intervals along, for e...

no. 3 example

[0071] 6 and 7 show an example of a magnetization pattern of a signal that has been recorded on a magnetic disk installed in a magnetic recording / reproducing apparatus according to a third embodiment of the present invention.

[0072] The magnetization patterns shown in Figures 6 and 7 are recorded by bringing the surface of a magnetic disk into contact with a master information carrier having the same ferromagnetic film pattern deposited in its surface.

[0073] For comparison, FIG. 8 shows a conventional magnetization pattern that has been preformatted recorded on a magnetic disk using a dedicated servo track writing device and a magnetic head built into the drive. The pattern shown in FIG. 8 corresponds to the patterns shown in FIGS. 6 and 7 .

[0074] 6 to 8 show an example of magnetization patterns in which a plurality of preformat signals are recorded in a preformat area formed at certain angular intervals along, for example, the circumferential direction (ie, track leng...

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Abstract

A magnetic disk for a magnetic recording / reproduction device includes a magnetic head, wherein a magnetization bit-pattern corresponding to a preformat information signal is recorded beforehand on the magnetic disk, wherein the magnetization bit-pattern is recorded by contacting a surface of the magnetic disk with a surface of a master information carrier having a pattern corresponding to the preformat information signal, and a portion of the magnetization bit-pattern corresponding to at least one signal selected from a clock signal and a synchronous signal has a recording width that is larger than a recording track width of the magnetic head in a radial direction of the magnetic disk.

Description

technical field [0001] The present invention relates to a magnetic recording / reproducing apparatus having high recording density and large capacity. Background technique [0002] The recording density of magnetic recording / reproducing devices is increasing to achieve smaller size and larger capacity. Especially in the field of hard disk drives of typical magnetic writing devices, hard disk drives with areal recording densities greater than 1 Gbit / in2 are already available on the market, and areal recording densities of 10 Gbit / in2 are expected to be achieved within a few years. This technology is advancing by leaps and bounds. [0003] One of the main technical factors that can lead to such a high recording density is the increase in linear recording density due to the improvement of the magnetic recording medium, the performance of the head-disk interface and the emergence of new signal processing methods such as "partial response methods". However, in recent years, the i...

Claims

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Application Information

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IPC IPC(8): G03F7/00G11B5/012G11B5/02G11B5/55G11B5/596G11B5/82G11B5/86G11B20/12G11B21/10G11B27/30
CPCG11B5/012G11B5/59633G11B5/743G11B5/865G11B5/59688B82Y10/00G11B5/82G11B5/746G11B27/3027G11B2220/20G11B5/5526
Inventor 石田达朗浜田泰三东间清和领内博宫田敬三
Owner PANASONIC CORP
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