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Data reading device

A data and address reading technology, applied in data recording, reproduction of non-user data, digital recording/reproduction, etc., can solve problems such as small spot size

Inactive Publication Date: 2004-01-21
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the data in the head portion 10 is recorded by pressing, the length of the recording mark in the head portion 10 cannot be made smaller than the spot size of the laser beam

Method used

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Embodiment Construction

[0042] A data reading device according to a first embodiment of the present invention will be described below. The data reading device according to the first embodiment has an improved version of the formatter 6 in FIG. 5 . Therefore, the data reading device is the same as that shown in FIG. 5 except for the formatter 6 . The following description will discuss a data reading device using MO as a recording medium. Therefore, it should be understood that the terms "address mark", "AM detection signal" and "AM detection circuit" shall denote the terms "address synchronization mark", "address synchronization mark detection signal" and "address synchronization mark detection circuit", respectively, and these terms For recording media other than MO.

[0043] As shown in FIG. 7, the data reading device of the first embodiment has a formatter 60, and the formatter 60 includes a first AM detection circuit 21a, a second AM detection circuit 21b, a third AM detection circuit 21c, a fir...

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Abstract

A data reading apparatus, capable of reducing the recording field of a header portion, generates a read clock signal based on the average rotational speed and recording density of a disk. Delay circuits generate first and second delay clock signals of different phases. Three ID reading apparatuses operate in accordance with the read clock signal and the first and second delay clock signals to read address information at different timings. A selector circuit selects the best read address and error detection result from the read addresses and error detection results for the read addresses.

Description

[0001] Cross-References to Related Applications [0002] This application is based on and claims priority from Japanese Patent Application No. 2002-187992 filed on June 27, 2002, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a data reading device for reading data from a recording medium, and more particularly, the present invention relates to a data reading device for reading data from a recording medium having a header portion for each sector. Background technique [0004] Recently, a large amount of data is recorded on a recording medium at a high recording density. Each sector of MO (Magneto Optical Disk) and DVD-RAM (Digital Versatile Disc Random Access Memory) consists of a header portion and a data portion. Increasing the recording density and the capacity of the recording medium requires increasing the recording density of the data portion. In addition, increasing the actual recording cap...

Claims

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Application Information

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IPC IPC(8): G06F3/06G11B7/005G11B7/007G11B11/105G11B20/14G11B20/18
CPCG11B20/1403G11B11/10595G11B7/00745G11B2220/2575G11B7/0053G11B11/10515G11B2220/216G06F3/06
Inventor 安部智利
Owner FUJITSU LTD