JP2529192B2 - Information recording and playback method - Google Patents

Description

The present invention relates to a method for recording / reproducing information, and more particularly to an information recording / reproducing method intended to improve the information recording speed as a whole.

[Prior Art] An information recording / reproducing apparatus has conventionally been a magnetic disk,
Although an optical disk device, a magneto-optical disk device, and the like are known, the optical disk device will be described as an example below.

3 (A) and 3 (B) are schematic diagrams showing the form of tracks on the optical disc, and FIG. 3 (C) is a format diagram of one track.

The optical disc 1 shown in FIGS. 1A and 1B has concentric and spiral tracks T, respectively, and is used as a recording area when recording in a certain track area is impossible. A track RT area is provided.

Further, as shown in FIG. 3C, each track mainly has an ID area for storing a track number and a DA area for storing data.
It consists of the TA area and can read any track by accessing the ID area.

Next, the basic operation of a conventional optical disk device using such an optical disk information recording medium will be briefly described.

FIG. 4 is a block diagram of a conventional optical disk device, and FIG.
The figure is a flow chart for explaining the operation.

In FIG. 4, the optical disk 1 is a spindle motor 2
Information is recorded by the light beam 4 from the optical head 3. The reflected light from the optical disk 1 is used for reproducing information received by the optical head 3, focus control and tracking control.

The tracking control and the focus control are performed by the AT-AF circuit 13, and the optical head 3 can be moved by the linear motor 14. Further, the operation of the linear motor 14 is controlled by the control unit 16 via the motor drive circuit 15, and the optical head 3 can access any track according to a command from the control unit 16.

Here, the operation of recording information on the arbitrary track T of the optical disc 1 will be described with reference to FIG.

First, information is sent from the outside through the interface 1
The data is stored in the buffer memory 6 having a capacity equal to or larger than the track (step S1 in FIG. 5), and the optical head 3 accesses the track T to be recorded. The information stored in the buffer memory 6 is ECC (Error-Correcting Cod
e) Coded by the circuit 7 and modulated in a predetermined system by the digital modulation circuit 8. The laser drive circuit 9 drives the laser of the optical head 3 according to the modulated information, and records the information on the track T of the optical head 1 in a pit row (step S2).

When the information is recorded on the track T in this way, the information just recorded on the track T is reproduced by the optical head 3 for the purpose of checking whether or not the information is correctly recorded (step S3). That is, the information read by the optical head 3 is amplified by the head amplifier 10 and then demodulated by the waveform shaping circuit 11 and the digital demodulation circuit 12 to obtain the ECC.
Input to the circuit 7.

The ECC circuit 7 similarly checks the reproduced information to detect an error (step S4). If there is no mistake here,
It is judged whether or not there is the next information (step S9). If the error can be corrected, the corrected information is recorded again on the track T and the operations of steps S3 and S4 are performed. If the information is correctly recorded, it is judged whether or not the next information is present (step S9), and if the transfer information is present (N in step S9).
O), steps S1 to S4 and S9 are repeated until the transfer is completed.

If there is an error in step S4 and it cannot be corrected (NO in step S4), the optical head 3 accesses the alternative track RT (step S5), and the same information is recorded on the alternative track RT (step S6). Thus the alternative truck RT
When the information is recorded on the disk, the information is reproduced from the alternative track RT (step S7), and the ECC circuit 7 checks whether the information is correctly recorded (step S8).

If an error is detected here (NO in step S8), steps S5 to S8 are repeated the set number of times.

When information is correctly recorded on the alternative track RT (YES in step S8), it is determined whether or not there is information to be transferred next (step S9). If there is transfer information (N in step S9)
O), the operation from step S1 is performed, and when the information transfer is completed (YES in step S9), the recording operation is ended. The above operation is performed under the control of the control unit 16.

[Problems to be Solved by the Invention] However, the above-described conventional information recording / reproducing apparatus has a problem that an unnecessary time is required for the alternative track processing and the recording speed is reduced as a whole.

That is, as described above, in step S4, the track T
If it is determined that the track is defective, the optical head is accessed from the track T to the alternative track RT, and the alternative track RT is accessed.
When the recording on is finished, it is necessary to return the optical head 3 to the next track T again. Such an access operation is performed by moving the optical head 3 by the linear motor 14 and AT
The tracking operation of the AF circuit 13 is performed, and the recording operation is not performed during that time.

Particularly, in the recording operation of the color image information in which the information amount is several M Bytes to several tens M Bytes, the alternative track process may be performed several times, and each time the optical head 3 is accessed as described above. In the information recording / reproducing apparatus, the recording operation speed as a whole is extremely reduced.

[Means for Solving Problems] The present invention has been made in view of the above-mentioned conventional problems,
It is therefore an object of the present invention to provide an information recording / reproducing method capable of significantly shortening the time required for recording, without requiring the recording / reproducing head to access the alternative recording area one by one, even if a plurality of defective recording areas occur. is there.

An object of the present invention is to record a series of information in the recording area using an information recording medium having a recording area and an alternative recording area, and to the alternative recording area when a defective recording area exists in the recording area. In an information recording / reproducing method for recording information in place of the defective recording area, an information recording / reproducing apparatus having a memory is used to record information in the recording area and reproduce the information recorded in the recording step. The step of detecting whether or not the information is correctly recorded, and the step of storing the information to be recorded in the memory without rewriting to the alternative recording area when it is detected that the information is not correctly recorded in the detecting step Steps and the above steps are repeated for each predetermined information unit until the recording of the series of information is completed, and after the series of information recording is completed, the information stored in the memory is stored. It is achieved by an information recording and reproducing method characterized by comprising the step of recording the replacement recording area in a lump.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an information recording / reproducing apparatus used in the information recording / reproducing method of the present invention. However, the same components as those of the conventional example are denoted by the same reference numerals, and the description is simplified.

In the figure, a buffer memory 6 for storing information transferred from the outside via the interface 5 is
A buffer memory 17 for alternative tracks having a capacity of one track or more (hereinafter referred to as RT memory 17) is connected,
The output terminal of the RT memory 17 is connected to the ECC circuit 7.

The information stored in the buffer memory 6 is coded by the ECC circuit 7, passes through the digital modulation circuit 8 and the laser drive circuit 9, and is then transmitted by the optical head 3 to the optical disc 1.
Recorded in. The recorded information is read from the optical head 3 for inspection, and the head amplifier 10, the waveform shaping circuit 11,
It is input to the ECC circuit 7 via the digital demodulation circuit 12 and is inspected there. The inspection result is output to the control unit 16, and error control is performed as described later.

Further, a track number memory 18 (hereinafter, referred to as TN memory 18) is connected to the control unit 16 and stores the number of a defective track determined to be error-correctable by the error control.

Next, the second alternative track processing operation of the present embodiment will be described.
This will be described with reference to the drawings.

FIG. 2 is a flow chart showing the operation of this embodiment.

In the figure, the operation when the recorded information is reproduced without error is the same as the conventional one, and steps S1 to S4 and
Shown at S9. Therefore, the operation when the error cannot be corrected will be described.

First, when certain information is transferred from the outside and stored in the buffer memory 6 via the interface 5, the control unit
The 16 outputs a control signal to the motor drive circuit 15 based on the read signals from the AF-AT circuit 13 and the waveform shaping circuit 11, and operates the linear motor 14 to make the optical head 3 access a predetermined track. Then, after the information is recorded on the track, the information from the track is reproduced for inspection (steps S1 to S3).

If the error in the reproduced information cannot be corrected and it is determined that the track is a defective track (step S4
No), the control unit 16 stores the track number recorded in the ID area of the defective track in the TN memory 18 (step ST1), and stores the information to be recorded stored in the buffer memory 6 in the RT memory 17 Transfer to (step ST
2). Operation above (steps S1 to S3, S9 or ST1, ST2)
Is repeated until the information transfer from the interface 5 is completed, and all the information transferred from the outside is correctly recorded on the track of the optical disk 1 or stored in the RT memory 17 if it is a defective track. .

Here, when it is determined whether or not the information has been correctly recorded and it is determined that the track is defective, the information to be recorded in the defective track is not recorded in the alternative track but is transferred from the buffer memory 6 to the RT memory 17. It is transferred and stored in the RT memory 17. In the present embodiment, recording / reproduction of information is performed for each track unit, and recording / reproduction of information in FIG. 2 and transfer of information to the RT memory 17 are all performed for each track unit.

When the information transfer from the interface 5 is completed (YES in step S9), the operation of recording the information stored in the RT memory 17 on the alternative track is started.

First, the control unit 16 operates the linear motor 14 to access the optical head 3 to an alternative track (step ST
3). Then, the information stored in the RT memory 17 and the defective track number stored in the NT memory 18 are read out, coded by the ECC circuit 7, and passed through the digital modulation circuit 8 and the laser drive circuit 9 to obtain optical data. The head 3 records on an alternative track (step ST4).

The information recorded on the alternative track is read by the optical head 3 for inspection, reproduced by the head amplifier 10, the waveform shaping circuit 11, and the digital demodulation circuit 12 and input to the ECC circuit 7 (steps ST5 and ST6).

The ECC circuit 7 checks the reproduced information and outputs the result to the control unit 16. When an error is detected (NO in step ST6), the control unit 16 repeats the above steps ST3 to ST5 a set number of times.

If the information is recorded correctly on the alternate track (step
(YES in ST6), the control unit 16 determines whether the RT memory 17 has information (step ST7). If there is information (NO in step ST7), perform the operation after step ST3 in the same way, and RT
The recording operation ends when all the information stored in the memory 17 is correctly recorded in the alternative track (step S9).
YES).

In this way, if the RT memory 17 having a sufficient capacity is provided, it is possible to access the alternative track only once.

In the present embodiment, the case where the optical disc 1 is used as the information recording medium has been described, but the present invention is not limited to this, and may be a recording medium such as a magnetic disc or a magneto-optical disc having an alternative track. Good.

[Effects of the Invention] As described above, according to the present invention, information recording and inspection is performed for each predetermined information unit until a series of information recording is completed, and a memory of information to be recorded when a defect is determined in this inspection. When it is determined that the information was not recorded correctly in the inspection stage, the information to be recorded is stored in the memory without rewriting to the alternative recording area, and is stored in the memory after the recording of a series of information is completed. By recording the stored information collectively in the alternative recording area, it is not necessary to access the recording / reproducing head for each alternative recording area even if there are multiple defective recording areas in the recording area of the medium. Since the replacement process is completed only by accessing the alternative recording area once after the recording of a series of information by the head, there is an effect that the time required for recording can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an information recording / reproducing apparatus used in the information recording / reproducing method of the present invention, and FIG. 2 is a flowchart showing an embodiment of the information recording / reproducing method of the present invention. (A) and (B) are schematic diagrams showing the form of tracks of the optical disc, FIG. 3 (C) is a format diagram of one track, FIG. 4 is a block diagram of a conventional optical disc device, and FIG. 7 is a flowchart for explaining the operation of the above-mentioned conventional example. 1 ... Optical disc 3 ... Optical head 6 ... Buffer memory 7 ... ECC circuit 17 ... Alternative track buffer memory (RT memory) 18 ... Defective track number memory (TN memory)

Claims (1)

(57) [Claims] 1. An information recording medium having a recording area and an alternative recording area is used to record a series of information in the recording area and to the alternative recording area when a defective recording area exists. In an information recording / reproducing method of recording information in place of a defective recording area, using an information recording / reproducing apparatus having a memory, recording information in the recording area, and reproducing information recorded in the recording step, Detecting whether or not the information is correctly recorded, and storing the information to be recorded in the memory without rewriting to the alternative recording area when it is detected that the information is not correctly recorded in the detecting step. Then, the above steps are repeated for each predetermined information unit until the storage of the series of information is completed, and the information stored in the memory is recorded after the recording of the series of information is completed. And a step of collectively recording in the alternative recording area.