JPH10144006A - Digital data recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital data recording/reproducing device capable of reading other data without using a duplicated device when an error such as a data reading error occurs. SOLUTION: The same data is recorded in the two layers of a re-writable optical disk 2 having a first data recording layer 22 and a second data recording layer 24, for reproducing, the data recorded in the first data recording layer 22 is read and reproduced and, when a substantial reproducing inability occurs during reproduction, from a logical address corresponding to a logical address where the data is recorded for reading, reading of the data recorded in the second data recording layer 24 is started and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital data recording / reproducing apparatus using an optical disk, and more particularly, to a digital data recording / reproducing apparatus for performing error correction of digital data.

[0002]

2. Description of the Related Art Conventionally, there is an apparatus using a mirror disk as an apparatus for compensating for errors in digital data. When a hard disk drive is used as a computer storage device, a method called a mirror disk is used. As a backup in case of an error in recorded data, two hard disks of the same storage capacity are connected to the computer, and both are used for data recording. Digital data is recorded on the same disk simultaneously.

When an error such as inability to read data from one hard disk drive due to damage to the disk occurs, data errors are complemented by reading data from the other hard disk drive.

[0004]

According to the above-mentioned conventional apparatus, two hard disks and a hard disk for driving each are required, and two independent disk devices are required. There was a problem that a pair was required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital data recording / reproducing apparatus which is capable of reading data from another device without error due to an error such as inability to read data.

[0006]

A digital data recording / reproducing apparatus according to the present invention has the same data as two pairs in a rewritable optical disk having 2n layers (n = natural number) for recording digital data. Is recorded, and at the time of reproduction, the data recorded on one of the two layers forming the pair is read and reproduced. When the reproduction becomes substantially impossible during the reproduction, the data being read is Switching is performed such that reading of recorded data is started from a logical address corresponding to the recorded logical address to another one of the two layers forming the pair and reproduced.

[0007] The digital data recording / reproducing apparatus of the present invention comprises:
In a rewritable optical disk having 2n layers (n = natural number) for recording digital data, the same data is recorded on two pairs of rewritable optical discs, and is recorded on one of the two pairs of layers during reproduction. The read data is read, and when the data becomes substantially unreproducible during the read, the logical address corresponding to the logical address where the data that was being read was recorded in the two layers forming the pair. The readout of the data recorded on the other one layer is started and the reproduction is performed. Therefore, even when the data cannot be read from one layer, the error is complemented because the data of the other layer in the paired layer is read.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital data recording / reproducing apparatus according to the present invention will be described below with reference to embodiments. FIG.
FIG. 2 is a block diagram of a digital data recording / reproducing apparatus according to one embodiment of the present invention, and FIG. 2 is a schematic diagram showing a configuration of a rewritable optical disk used in the digital data recording / reproducing apparatus according to one embodiment of the present invention. (A) is a sectional view, and (b) is a plan view.

A digital data recording / reproducing apparatus 1 according to one embodiment of the present invention sends digital data for recording from a computer 12 to a data processing unit 8 and converts the digital data input in the data processing unit 8 to an optical disc. 2 is coded necessary for recording on the optical disc 2, and address information, error correction information, etc. are added thereto, supplied to the RF amplifier 5 for amplification, and the amplified output is supplied to the optical pickup 4 for rewritable optical disc. Record in 2.

Here, an example of a single-sided two-layer disc structure will be described. The optical disk 2 is, as shown in FIG.
Has a two-recording-layer structure of a data recording first layer 22 and a data recording second layer 24 formed on the surface thereof, and the substrates 21 and 23 are integrally formed with the recording layer interposed therebetween. Data is recorded on the data recording first layer 22 and the data recording second layer 24 from the inner periphery to the outer periphery of the spiral track 25 having the same contents. In FIG. 2, reference numeral 26 denotes a hole for insertion into the rotor shaft of the spindle motor 3, through which the optical disc 2 is inserted into the rotor shaft of the spindle motor 3, and the rotor shaft of the spindle motor 3 is magnetized by a magnet. Clamp.

When data is recorded on the optical disk 2 by the optical pickup 4, the servo processing unit 6 controls the radial position of the optical pickup 4 and the rotation of the spindle motor 3 so that the optical processing is performed at a position opposite to the address part to be recorded. The pickup 4 is moved, and the data recording first layer 22 is moved.
The same position is recorded on the data recording first layer 22 and the data recording second layer 24 by switching the focal position of the optical pickup 4 between the case of recording on the data recording layer and the case of recording on the data recording second layer 24.

The data recording on the optical disk 2 will be further described. Digital data is recorded on the data recording first layer 22 of the optical disk 2 at a position where data can be recorded. Since the logical address at which data is recorded on the data recording first layer 22 and the same logical address of the data recording second layer 24 are areas where data can be recorded, the same data as the data recorded on the data recording first layer 22 is recorded. It will be recorded at the same position of the logical address of the layer 24.

Therefore, the optical disk 2 on which recording has been completed
, The same contents are recorded on the first data recording layer 22 and the second data recording layer 24.

When data is read from the optical disk 2, the rotation is controlled under the control of the servo processor 6, and the focal position of the optical pickup 4 is controlled.
The data is read and reproduced by the optical pickup 4 from the data recording first layer 22, amplified by the amplifier 4, and transmitted to the data processing unit 8. The data is decoded and error-corrected in the data processing unit 8 and transferred to the computer 12.

In FIG. 1, reference numeral 7 denotes a CPU, and reference numeral 1 denotes a CPU.
Reference numeral 11 denotes a display, and reference numeral 11 denotes a keyboard, which constitutes a computer for control. The RF amplifier 5, the servo processing unit 6, and the data processing unit 8 are controlled via a bus 9 to write and read data. Are respectively controlled.

As described above, data is normally read from the data recording first layer 22, but data recorded at an arbitrary logical address of the data recording first layer 22 is read from the optical disk 2.
If it is determined that the read data is not normal due to an error that cannot be corrected due to scratches or the like, the data recording corresponding to the logical address of the data recording first layer 22 that was being read when the error occurred. The focal position of the optical pickup 4 is switched to execute reading from the data recorded at the logical address of the second layer 24.

Accordingly, when data cannot be reproduced substantially while data is being read from the data recording first layer 22, the logical address corresponding to the logical address at which the data being read was recorded was recorded. Then, reading of data recorded on the data recording second layer 24 is started, and reproduction is performed. Therefore, the data recording first layer 2
Even if the data becomes virtually unreadable from 2,
By reading the data in the data recording second layer 24 forming a pair, it is possible to complement data that has caused an error and could not be read substantially.

If the same logical address of the first data recording layer 22 and the second data recording layer 24 is physically close to each other, such as symmetrical positions on both sides of the optical disc 4, the amount of movement of the optical pickup 4 at the time of switching is also small. I need less, 2
The time for performing the recording twice can be shortened.

The optical pickup 4 may be installed so as to face each surface of the optical disk 2 and simultaneously record data on both the first data recording layer 22 and the first data recording layer 22. Optical disk 2 as pickup
The recording may be simultaneously performed on both recording layers from one side of the recording layer.

The optical disk 2 is a rewritable optical disk having 2n layers (n = natural number) for recording digital data, and the same data is recorded on two pairs of layers.
At the time of reproduction, data recorded in one of the two layers forming a pair is read and reproduced, and when reproduction becomes impossible, a pair 2 is formed.
Data recorded in another layer among the layers may be read and reproduced.

The above-described optical disk can be used for recording and reproducing audio information or moving image information. In this case, the same audio data or moving image data is recorded on two layers as in the case of digital data. This optical disk is the same as the optical disk on which digital data is recorded.
It may be used for data complementation at the time of error, or during reproduction, the layer being reproduced is switched from the first layer to the second layer or vice versa from the second layer to the first layer. It is also possible to compare differences in sound quality or image quality.

[0022]

As described above, according to the digital data recording / reproducing apparatus according to the present invention, data can be easily backed up using a rewritable optical disk composed of two or more recording layers. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of a digital data recording / reproducing apparatus according to an embodiment of the present invention.

FIGS. 2A and 2B are schematic diagrams showing the configuration of a rewritable optical disk used in a digital data recording / reproducing apparatus according to an embodiment of the present invention, wherein FIG. 2A is a cross-sectional view and FIG. .

[Explanation of symbols]

 Reference Signs List 2 optical disk 3 spindle motor 4 optical pickup 6 servo processing unit 8 data processing unit 12 computer 22 data recording first layer 24 data recording second layer 21 and 23 substrate

Claims (2)

[Claims] 1. A layer for recording digital data is composed of 2n layers (n
= Natural number) The same data is recorded on two pairs of layers in a rewritable optical disc provided with
The data recorded in one of the layers is read out and reproduced, and when the reproduction becomes substantially impossible during the reproduction, the data read out is read from the logical address corresponding to the logical address where the data was recorded. A digital data recording / reproducing apparatus, which starts reading data recorded on another layer out of the two layers forming the pair and switches the data to be reproduced. 2. The digital data recording / reproducing apparatus according to claim 1, wherein the digital data recorded on the optical disc is audio data or image data.