JPS63293761A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce unreadable data by deciding whether a sector can executed reading, wring or erasing operation or not on the basis of the number of times of reading out IDs recorded in plural times. CONSTITUTION:A reproducing optical beam 26 is radiated from an optical head 25 to a recording medium 28, and while checking IDs of sectors immediately before the sector to be erased, the required sector is searched. At the time of executing reproducing, recording or erasing operation in the required sector, whether the sector can executed the operation or not is decided on the basis of the number of address parts to be accurately read out in the reproducing operation of plural address parts to be executed prior to respective operation. Namely, the number of unreadable data can be reduced by setting up a reference for deciding a safe sector at the time of recording to a severe level as compared to the reproducing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording/reproducing device, and particularly to a recording medium having a plurality of sectors each having a plurality of address sections recording address information. The present invention relates to an information recording/reproducing device that performs recording or erasing.

[Prior art and its problems] Conventionally, information recording and reproducing devices include magnetic disk devices, optical disk devices, magneto-optical disk devices, optical card devices, etc. In the following description, optical disk devices will be used as an example. Let me explain.

Fig. 5 is a plan view showing the format of an optical disc used in an optical disc device.As shown in the figure, a zero-person disc is composed of sectors SO to sn consisting of a header part ao-an and a data part do/Vdn. has been done.

To record, erase, or reproduce information in a target sector, reproduce part of the header aO to an of the sector, confirm that it matches the address of the target sector, and then read the information in the data part of the sector. When reproducing or recording or erasing information in the data area, if there is a defect in the address area of a sector and the address cannot be reproduced, it becomes impossible to access the information to the sector, and the accuracy of the optical disc is lost. There is a risk that the recorded information may not be able to be recorded or the recorded information may not be reproduced, resulting in the loss of the recorded information.

Therefore, conventionally, for example, each sector is formatted into a plurality of address sections (D) as shown in FIG. 6 to cope with the destruction of the address sections.

In the figure, 1 indicates the starting position of each sector.
(ssctor mark), 2o
, 21 , ...-・・----, 2n-1
, 2n are the address part ID (iden
tifier), 3 is GAP that absorbs rotational fluctuations of the disk, and 4 is S indicating the synchronization timing of the subsequent field.
YNC (synchronization ma
rk), 5 is AM (address mark)
, 6 is a data area for recording information, and 7 is an error correction code ECC (error
correcting code), 8 is GAP
It is. In addition, each address part IDo to IDn (n≧0)
is 9 (7) SINC, to AM, 11 TN (t
rack number), 12 c7) S N
(sector number), C of l3
RC (cyclic redency code), 1
It consists of 4 GAPs.

The CRC 13 determines whether the address information (address parts IDo to IDn) can be reproduced or not, and the CRC 13 can confirm the correctness of the address information in real time.

However, in the conventional determination method of this type, reading, writing, and
Since the number (number of times) of address section IDs that can be read accurately in any erasing operation is limited, there is a problem in that some sectors can be written but cannot be read.

[Means for solving problems] The object of the present invention is to solve the problems of the prior art described above.

An object of the present invention is to provide an information recording/reproducing device that can reduce the amount of data that cannot be read.

The above object is to provide an information recording/reproducing apparatus for reproducing, recording, or erasing data from a recording medium having a plurality of sectors each having a plurality of address sections recording address information.

When performing the above reproduction, recording, or erasing to the desired sector,
Information recording/reproduction characterized in that whether or not a sector can perform these operations is determined based on the number of address sections that can be read accurately in the reproduction operation of the plurality of address sections performed prior to each of these operations. This is accomplished by a device. In particular, when determining whether a sector can be read, recorded, or erased, the number of times the plurality of address parts can be read is N1 times for reproduction, N2 times for recording, and N3 times for erasing, Nl< It is preferable that N2 and Nl<N3.

[Function] According to the information recording/reproducing device as described above, it is determined whether or not a sector can perform reading, recording, and erasing operations by recording multiple times and then determining how many times an ID can be read. Therefore, it is possible to write or erase data in a place where there is a high probability that the ID can be read. This idea was born from the idea that if recording and erasing and reproducing are treated at different levels of risk, the safety of information reproducing will be further increased.

[Examples] Hereinafter, the information recording and reproducing apparatus of the present invention will be described in detail based on specific examples.

FIG. 1 is a diagram showing a schematic configuration diagram when an information recording/reproducing apparatus according to the present invention is applied to an optical head device.

In the figure, 20 is a host interface, 21 is a track buffer, 22 is an ECC, 23 is a modulation circuit for modulating a light beam according to a recording signal, 24 is a laser drive circuit, 25 is an optical head, and 26 is a corresponding A light beam from the optical head, 27 a near motor for driving the optical head, 28 a disk-shaped recording medium, 29 a spindle motor for rotating the medium, 30 an AT (auto
trackking), AF (auto fo
31 is a head amplifier that amplifies the signal from the optical head, and 32 is a demodulation circuit that demodulates an information signal etc. from the signal.

33 is an address regenerator, and 34 is a plurality of address sections IDa.
- A counter circuit that counts the number of address parts accurately reproduced from IDn, 35 a comparator that compares the count number of the reproduced address signal with a preset number, and 36 a controller.

Below, we will take as an example a case where the address part ID is written four times in a part of the header (IDo-ID4).

The operation of this embodiment will be described with reference to the configuration diagram in FIG. 1 and the flowcharts in FIGS. 2 to 4. It should be noted that explanations of operations 1, such as AF, AT operations, ECC, etc., which are not directly related to the operations of this embodiment will be omitted.

FIG. 2 shows a flowchart of the erase operation.

First, a reproduction light beam 26 is irradiated from the optical head 25 onto the recording medium 28, and while checking In, the desired sector is searched for until the sector immediately before the sector to be erased.When the desired sector is found, the sector is The address information of all provided address sections IDo-104 is reproduced by the address reproduction circuit 33 (step Sl in FIG. 2).
, Here, if the address information is correctly reproduced by checking the CRC 13, the counter of the counter circuit 34 is counted up by one.

In this embodiment, the number of ID criteria for each operation (i.e., the number of times a sector can be determined to be processable in each operation, if the number of IDs can be read accurately) is determined as follows: Readout (Nl) is performed once, write-in (N2) is performed twice, and erasure (N3) is performed three times.

Therefore, after the reproduction of the address information recorded in all address sections IDo-ID4 is completed, the number of counters counted by the counter circuit is compared with a predetermined count number set as N5=3 in advance in the erase operation. When the number of accurately reproduced counts is 3 or more (Y in step S2 in FIG. 2),
ES), erase the information in the data section 6 (step S3)
, In addition, if the number of correctly reproduced counts is less than 3 times (No in step S2 in ti42 diagram),
If necessary, replacement sector processing is performed (step S4).

FIG. 3 shows a flowchart of the write operation.

The flow is similar to that of the erasing operation, but in step S2, the number of times of determination is set to two. That is, when the number of accurately reproduced counts is 2 or more (YES in step S2 in FIG. 3), information is recorded in the data section 6 (step S3), and the number of counts that are accurately reproduced is If it is less than 2 times (No in step S2),
If necessary, replacement sector processing is performed (step S4).

FIG. 4 shows a flowchart of the read operation.

Step St is similar to the erase and write operations.

In the judgment in step S2, if the ID can be read accurately at least once out of the four IDs, it is judged that the sector can read data, and the data is read in step S3; otherwise, No reading is performed (NO in step S2 in FIG. 4).

As mentioned above, the ID for each operation of playback, recording, and erasing
The number of judgment criteria for playback is multiplied by the number of judgment criteria for recording (Nl).
By setting N2) < a (N3) of the erasure criteria, data will be written in a place where there is a high probability that the ID can be read (in other words, when recording or erasing, it is assumed that the sector is safe). By making the criteria for judgment more stringent than that for reproduction), it is possible to reduce the amount of unreadable data. If this is the case, one so-called spare address field is always secured for recording and two for erasing, so even if one of the address fields is damaged due to aging of the medium, the recorded information will not be lost. This is because it can be secured, or it can be a non-problematic sector with no information recorded. Further, it is advantageous to enable reproduction if there is at least one address section that can be reproduced accurately, since it reduces the number of cases in which recorded information cannot be read.

The present invention is not limited to the above-mentioned embodiments, and various modifications and applications are possible.

In the embodiment described above, the number of ID judgment criteria for each operation of playback, recording, and erasing was set to Nl<N2<N3, but the conditions may also be set to Nl<N2 and Nl<N3, and furthermore, Nl<N2 and It is also possible to set N2=N3, which is clear from the above reasons.

Furthermore, although the above embodiments have been explained using an optical disk device as an example, it is clear that the present invention can also be applied to optical information recording and reproducing devices such as optical cards. [Effects of the Invention] As explained above, the present invention According to the information recording and reproducing device of the invention, the ID is determined by recording multiple times whether or not the sector is capable of performing reading, writing, or erasing operations.
By doing this depending on how many times it can be read,
It becomes possible to write data in a place where there is a high probability that the ID can be read, and the amount of data that cannot be read can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration diagram when an information recording/reproducing apparatus according to the present invention is applied to an optical head device. FIG. 2 is a flowchart showing an erasing operation in an embodiment of the information recording/reproducing apparatus of the present invention. FIG. 3 is a flowchart showing the write operation in the embodiment. FIG. 4 is a flowchart showing the read operation in the embodiment. FIG. 5 is a plan view showing the format of an optical disc used in the optical disc device. FIG. 6 is a diagram showing the four-yat configuration of each sector. 33 Near address regeneration circuit 34: Counter circuit 35: Comparator 36: Controller agent Patent attorney Jo Yamashita Upper Figure 2 11 9 Gravity 4'F

Claims (3)

[Claims] (1) In an information recording and reproducing apparatus that reproduces, records, or erases data from a recording medium having a plurality of sectors each having a plurality of address sections each recording address information, the reproduction or recording is carried out in a desired sector. , or when performing deletion,
Information recording/reproduction characterized in that whether or not a sector can perform these operations is determined based on the number of address sections that can be read accurately in the reproduction operation of the plurality of address sections performed prior to each of these operations. Device. (2) When the number of criteria for the plurality of address parts in determining whether a sector can perform each operation of reproduction, recording, or erasing is N1 times for reproduction, N2 times for recording, and N3 times for erasing, The information recording and reproducing apparatus according to claim 1, characterized in that N1<N2 and N1<N3. (3) The information recording and reproducing apparatus according to claim 2, wherein the N1, N2, and N3 are set to satisfy N1<N2<N3.