JPH11339385A - Information reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an information reproducing method which can improve probability with which data are reproduced as much as possible since data cannot be reproduced at all when acquired defect caused by dust, damage and the like is caused at the time of reproduction of a data alternate region. SOLUTION: When an error is caused at the time of reading out data of a data alternate region E, an alternate control region B is referred, data of alternation corresponding to data of a read-out error recorded in a data region D are reproduced. Also, by referring to the alternate control region, it is discriminated whether data of a read-out error are alternated by a verifying error or by request of rewriting, when data are alternated the by verifying error, data of alternation recorded in a data region is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing method for reproducing information recorded on an information recording medium.

[0002]

2. Description of the Related Art Various types of recording media for optically recording information or reading recorded information have been known, such as a disk, a card, and a tape. Among them, a card-shaped recording medium (hereinafter, referred to as an optical card) is small, lightweight, convenient to carry, and has a large recording capacity. Therefore, a great demand for a write-once recording medium is expected in the future.

By the way, such an optical card, especially a write-once optical card in which information cannot be erased, has a large recording capacity even though the size is about the same as a credit card. For example, if the size of the optical card is 85
mm × 55 mm, the information track pitch is 20 μm, and the recording length of 1 bit is 5 μm, the number of optical card tracks is 2750, and the bit capacity per track is 1700.
In the case of 0 bits, the byte capacity per track is 2000 bytes. In order to manage data in such a large-capacity memory, it is necessary to manage files using directories. Normally, a directory is made up of information necessary for file management such as a file name, a file length, and a leading data track number, as shown in FIG. ing.

FIG. 8 is a diagram showing a recording surface of an optical card.
8, an optical card 1 is provided with an information recording area 2 in which tracking tracks 3 ₁ , 3 ₂ ,... Are arranged in parallel at regular intervals. An information track 4 for recording information between each tracking track
_1, 4 _2, ... it is provided, track number 5 for the two ends of each information track to identify in advance the information track
_1, 5 _2, ... it is recorded.

[0005] The information recording area 2 includes a card management area A, a replacement information management area B, a directory area C, a data area D, and a data replacement area E. Card management area A is an area for recording the size of each area of the optical card 1, the replacement information management area in the sector 10 ₁ B, directory area C, the data area D, the size of the data alternation area E (number of tracks) Is recorded. When accessing the file data of the optical card 1, first,
Sector 10 ₁ information card management area A is read. The size of the card management area A is fixed.

The data area D is an area for recording file data. In the optical card of FIG. 8, data is recorded using one information track as one sector. At the time of recording, the sector 40 starts from the information track on the lower side of the drawing.
₁ , 40 ₂ , etc. are recorded. The directory area C is an area for recording a directory for managing file data. In FIG. 8, in the directory area, one information track is divided into four sectors, and a directory is recorded in each sector. When recording a directory, recording is performed in the order of sectors 30 ₁ ,... From the left side of the information track, and when recording of one information track is completed, recording is performed again from the sector on the left side of the information track above it.

The data replacement area E is an area for replacing a sector of the data area when an error occurs during recording of file data. In the data replacement area E, similarly to the data area D, data is recorded in each sector using one information track as one sector. The replacement information management area B is an area for recording replacement management information regarding replacement when a sector in the data area D is replaced with the data replacement area E. In the replacement information management area B, one information track is divided into eight sectors, and eight replacement management information can be recorded on one information track.

Here, when data is recorded in each recording area, it is general to add an ECC (error correction code) and record in order to remedy a failure due to dust or the like. For example, when a Reed-Solomon double correction code is used as the ECC, it is confirmed by a single correction at the time of verification at the time of recording, and is read by performing a double correction at the time of actual reading. This is to ensure recording by checking with a correction capability weaker than at the time of reading at the time of verification.

FIG. 9 is a flowchart showing the flow of processing when recording file information. A method of recording file information will be described with reference to FIG. In this case,
A file F having a size corresponding to the first and second two sectors is stored in the optical card 1 in which nothing is recorded other than the card management area A.
1 shall be recorded. 9, first, the first sector of the file F1 is recorded in the data area D of the optical card 1 (S901). That is, records the data of the first sector of the file F1 in the first sector 40 ₁ of the data area as shown in FIG. Next, verification is performed by single correction in order to confirm whether or not the data has been normally recorded (S902). Also, the result of the verification is determined (S903), and if there is an error as a result of the verification,
The replacement process is performed in S904, and when the recording has been performed normally, the process ends. In this case, it is assumed that the recording was successful.

[0010] Next, to record data of the second sector of the file F1 in sector 40 _second data region D as shown in FIG. 8 returns to S901. When the recording is completed, verification is similarly performed by single correction (S902), and the result of the verification is determined (S903). In this case, it is assumed that a verify error has occurred, and the process proceeds to S904 to perform a replacement process. In S904, as shown in FIG. 8 records the data of the second sector of the file F1 in sector 50 ₁ data spare area E performs replacement processing. Then, since the replacement sector 40 ₂ of the data area D in 50 ₁ of data spare area E, to record replacement management information about the replacement sector 20 ₁ of the replacement management information area B (S905), the process ends. Figure 10 shows the contents of the replacement management information of the sector 20 _1. Replacement management information consist replacement source address and a replacement destination address, the sector 40 ₂ addresses on replaced address data area, the replacement destination address is sector 50 ₁ of the address of the replacement area. Moreover, recording a directory for managing the file F1 after data recording completion of the file F1 in sector 30 ₁ directory area C as shown in FIG.

Next, the operation for reproducing the file data recorded on the optical card 1 will be described with reference to FIG. It is assumed that the optical card 1 has been once taken out of an optical card drive (not shown) and inserted into the drive again. Further, it is assumed that the information of the card management information A, the replacement information management area B, and the directory area C has been read into the memory in the drive prior to the reproduction of the file data. In FIG. 11, first, the first file F1
It is determined that the data of the first sector has been replaced with reference to the replacement management information (S1101). In this case, the first sector is not replaced, read sector 40 ₁ data of the first sector of the data area D is recorded (S110
2) At this time, data is read by double correction. In addition, the result of the double correction is determined (S1103). If there is no error, the process ends normally. If there is an uncorrectable error, the process ends.

Next, the second sector of the file F1 is read. At this time, similarly, it is determined whether the target data has been replaced by referring to the replacement management information (S).
1101). In this case, since the second sector of the file F1 has been replaced by a verify error during recording,
Reads the sector 50 ₁ data of the second sector of data replacement area is recorded (S1104), this time, similarly reads out data by a double correction. In addition, the result of the double correction is determined (S1103). If there is no error, the process ends normally. If there is an uncorrectable error, the process ends.

In the above description, the replacement process is performed when a verify error occurs. However, the replacement process may be performed when data is rewritten. The recording method in such a case will be described with reference to the flowchart of FIG.
A description will be given with reference to the optical card of FIG. In this case, a file F2 having a size corresponding to three sectors of the first to third sectors is recorded on the optical card 1 in which nothing is recorded other than the card management area. In FIG. 12, first,
It is assumed that the data of the first sector of the file F2 is to be recorded, and it is determined whether or not the instruction from the higher-level device is to record the already recorded sector (S1201). In this case, it is assumed that the recording is a new recording, and as shown in FIG.
To the data area of the sector 40 ₁ records the data of the first sector (S1202). Next, verification is performed by single correction in order to confirm whether or not data has been normally recorded (S1205), and thereafter, the result of the verification is determined (S1204). At this time, the recording of the first sector is terminated assuming that the recording has been normally performed.

Next, the second sector of the file F2 is recorded. At this time, similarly, it is determined whether or not the instruction from the higher-level device is to record the already recorded sector (S1201). In this case, it is also a new record,
The data of the second sector is recorded in the sector 40 ₂ of the data area as shown in FIG. 13 (S1202). Next, verification is similarly performed by single correction (S120).
3), the result of the verification is determined (S1204). In this case, it is assumed that the verify error occurs, performs a replacement process for recording data in the second sector of the file F2 in sector 50 ₁ data spare area E as shown in FIG. 13 (S1205). Next, the sector 40 ₂ of the data area D
Since the swapped data replacement area E, the replacement management information about the replacement recorded sector 20 ₁ of the replacement management information area B as shown in FIG. 13 (S1206), the process ends. Figure 14 shows a replacement management information of the sector 20 _1. The replacement type indicates a replacement factor. Here, since the replacement source is a recording verify error, X is recorded. The replacement source address and the replacement destination address are the same as those of the sector 40 ₂ as described above.
When it is a 50 ₁ of address.

The third sector of the file F2 is recorded. Similarly, in S1201, it is determined whether or not recording is to be performed on an already recorded sector. In this case also assumed to be new recording is recorded in the third sector 40 ₃ data data area of the sector as shown in FIG. 13 (S120
2). Next, verification is performed by single correction (S1).
203), and determine the result of the verification (S120).
4). Here, the processing is terminated assuming that the recording has been normally performed. Upon completion of the recording of file data, and ends the recording process to record a directory for managing the data of the file F2, as shown in FIG. 13 to the sector 30 _1.

Next, the processing for rewriting the file data recorded in this way will be described again with reference to the flowchart of FIG. It is assumed that the third sector of the file F2 has been rewritten. In FIG. 12, first, it is determined whether or not the instruction from the host device is already recorded data (S
1201). In this case, the address (sector 40 ₃ ) at which the data of the third sector is recorded is specified by the host device, and the existing sector is rewritten. Therefore, as shown in FIG. recorded in the sector 50 _{and second} region E. Then, since the replacement sector 40 ₃ of the data area D in the sector 50 _{and second} data spare area E, and recorded in the sector 20 ₂ of the replacement management information area B the replacement management information about the replacement as shown in FIG. 13 process Is completed (S1206). Figure 15 shows a replacement management information of the sector 20 _2. The replacement type is recorded as Y because the replacement is performed by a rewrite request. Replacement source address and replacement destination address is the address of the sector 40 ₃ and 50 _2.

Next, the operation for reading the file data of the optical card thus recorded will be described with reference to FIG. In this case as well, it is assumed that the optical card is once taken out of the optical card drive and inserted into the drive again, and the information of the card management information A, the replacement information management area B, and the directory area C are read before the file data is reproduced. It is assumed that data has been read into the memory in the drive. FIG.
First, the first sector of the file F2 is read. At this time, it is determined whether the target data has been replaced with reference to the replacement management information (S1101). Since the first sector has not been replaced, the data of the first sector in the data area D is recorded. is read sector 40 ₁ is (S1102), this time, similarly reads out data by a double correction. Next, the result of the double correction is determined (S
1103) If there is no error, the process ends normally. If there is an uncorrectable error, the process ends.

Subsequently, the second sector of the file F2 is read. Similarly, referring to the replacement management information, it is determined whether or not the target data has been replaced (S11).
01). Since the second sector is replaced by a verify error during recording, reading a sector 50 ₁ data of the second sector of data replacement area is recorded (S
1104) At this time, data is read by double correction. In addition, the result of the double correction is determined (S1103). If there is no error, the process ends normally. If there is an uncorrectable error, the process ends. Further, when reading the third sector of the file F2, since the third sector of the file F2 has been replaced by the rewrite request, the process proceeds to S1104, where the data of the third sector of the data replacement area is recorded. It reads the 50 _2, reads the data by even a double correction this time. In addition, the result of the double correction is determined (S1103). If there is no error, the process ends normally. If there is an uncorrectable error, the process ends.

Next, the replacement process is performed even when scanning of the optical card has failed. The scan is a relative scan between the optical card and the optical head. For example, when an off-track occurs, data is recorded in a spare area. The recording method in this case will be described with reference to the flowchart in FIG. 16 and the optical card in FIG. In this case as well, the first to third optical cards 1 in which nothing is recorded other than the card management area are stored.
It is assumed that a file F2 having a size of three sectors of the sector No. is recorded. In FIG. 16, first, the file F
Data 2 of the first sector is recorded in the sector 40 ₁ of the data area as shown in FIG. 17 (S1601). next,
It is determined whether the track scan operation has been performed normally (S1602). At this time, the process proceeds to S1603 assuming that the scan operation has been performed normally. In S1603, verification is performed by single correction in order to confirm whether or not the recorded data has been normally recorded, and the result of the verification is determined (S1604). At this time, it is assumed that the recording was successful.

Next, to record data of the second sector of the file F2 to the sector 40 ₂ of the data area as shown in FIG. 17 (S1601). Also, it is determined whether or not the track scan operation has been performed (S1602). At this time, the process proceeds to S1603 assuming that the scan operation was normally performed. S
At 1603, verification is similarly performed by single correction, and the result of the verification is determined (S1604).
Here, the sector 40 ₂ Results of single correction, and that an error has occurred, the process proceeds to S1605 to perform the replacement process. In S1605, the data of the second sector of the file F2 is transferred to the sector 50 of the data replacement area E as shown in FIG.
Record in ₁ and perform the replacement process. Then, by recording the replacement management information on replacement since replacement sector 40 ₂ of the data area D in the data replacement area E to the sector 20 ₁ of the replacement management information area B as shown in FIG. 17 (S1606), the process ends I do. Replacement management information of the sector 20 ₁ is exactly the same as FIG. 10. That is, replacement source address and replacement destination address is the sector 40 ₂ and 50 ₁ of the address.

[0021] Then, recording data of the third sector of the file F2 to the sector 40 ₃ of the data area (S160
1). It is determined whether the track scan operation has been performed normally (S1602). At this time, it is assumed that the scan operation has not been performed normally (hereinafter, referred to as a scan error). When the scan error occurs, performs a replacement process to record the data of the third sector of the file F2 to the sector 50 _{and second} data spare area E as shown in FIG. 17 (S1
605). Moreover, by recording the replacement management information on replacement since replacement sector 40 _third data region D to the data replacement area E to the sector 20 ₂ of the replacement management information area B (S16
06), the process ends. Figure 18 shows a replacement management information of the sector 20 _2. Replacement source address and replacement destination address is the address of the sector 40 ₃ and 50 _2. File F2
When the data is recorded, and ends the recording processing to the sector 30 ₁ of directory area C the directory to manage the file F2, as shown in FIG. 17.

Next, the operation for reproducing the file data of the optical card thus recorded will be described with reference to FIG. It is assumed that the optical card is once removed from the optical card drive and inserted into the drive again, and the information of the card management information A, the replacement information management area B, and the directory area C are stored in the drive before the file data is reproduced. It is assumed that it has been read into memory. In FIG. 11, first, the first sector of the file F2 is read. At this time, it is determined whether the target data has been replaced with reference to the replacement management information (S1101). Since the first sector of the file F2 has not been replaced, the data of the first sector of the data area D is not replaced. There reads the sector 40 ₁ recorded (S1102). At this time, data is read by double correction. Further, the result of the double correction is determined (S11
03) If there is no error, the process ends normally. If there is an uncorrectable error, the process ends with an error.

Next, the second sector of the file F2 is read. Also in this case, it is determined whether the target data has been replaced by referring to the replacement management information (S110).
1). Since the second sector of the file F2 has been replaced reading the sector 50 ₁ data of the second sector of data replacement area is recorded (S1104). At this time,
Similarly, data is read by double correction. Next, the result of the double correction is determined (S1103). If there is no error, the process ends normally. If there is an uncorrectable error, the process ends. When reading the third sector of the file F2, similarly, in S1101, it is determined whether or not the target data has been replaced. Since the third sector of the file F2 has been replaced reading the sector 50 ₂ data of the third sector of data replacement area E are recorded (S11
04). At this time, the data is similarly read by double correction, and then the result of double correction is determined (S110).
3). As a result of double correction, if there is no error, it ends normally,
If there is an uncorrectable error, the process ends with an error.

[0024]

In the prior art, when a verify error occurs during recording, when a host computer requests data rewriting,
Alternatively, when a scan error occurs, the data is recorded in the data replacement area E and replacement processing is performed. However, when a data replacement area is reproduced, as described with reference to FIG. 11, if a read error occurs, the error is terminated irrespective of the type of replacement, and an acquired defect such as dust or scratches occurs in the replacement destination sector. When this occurred, data could not be reproduced. In other words, in the case of a replacement process due to a verification error, data is recorded at the replacement source, and there is a possibility that the data can be reproduced. When this occurred, no data could be reproduced.

An object of the present invention is to provide an information reproducing method capable of slightly increasing the probability that data can be reproduced in view of the above-mentioned conventional problems.

[0026]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data area for recording data, a data replacement area for replacing data due to a recording error in the data area, and a replacement management including a replacement source address and a replacement destination address. Using a recording medium having a replacement management area for recording information, the data area and the data replacement area are recorded with an error correction code, and the data recorded by performing verification are subjected to error correction at the time of the verification. In the information reproducing method for reproducing with higher correction capability, when an error occurs when reading data in the data replacement area, the replacement management area is referred to and the replacement source data recorded in the data area is reproduced. This is achieved by an information reproducing method characterized in that:

Another object of the present invention is to provide a data area for recording data, a data replacement area for recording data due to a recording error in the data area, and a data replacement area for recording data according to a rewrite request for data already recorded in the data area. ,
Using a recording medium having a replacement management area for recording replacement management information including a replacement source address, a replacement destination address, and replacement type information, the error correction code is recorded in the data area and the data replacement area, and verification is performed. In the information reproducing method for reproducing the data recorded by performing the above with the correction capability higher than the error correction capability at the time of the verification, if an error occurs when reading the data of the data replacement region, the replacement management region is referred to. It is determined whether the read error data has been replaced by a verify error or replaced by a rewrite request, and if the data has been replaced by a verify error, the replacement source data recorded in the data area is reproduced. This is achieved by an information reproducing method characterized in that:

Further, an object of the present invention is to provide a data area for recording data, a data replacement area for recording data due to a recording error of the data area and data due to a scan error at the time of recording, a replacement source address and a replacement destination address. Using a recording medium having a replacement management area for recording replacement management information including replacement type information, and recording the error correction code in the data area and the data replacement area, and performing the verification. In the information reproducing method of reproducing the data with a correction capability higher than the error correction capability at the time of verification, if an error occurs when reading the data in the data replacement region, the data of the read error is referred to by referring to the replacement management region. Determines whether replacement was performed due to a verification error or scanning error When that has been replaced by a verification error is achieved by an information reproducing method comprising reproducing the replacement source data recorded in the data area.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, the first of the present invention
An embodiment will be described. FIG. 1 shows a configuration example of a system including a host computer and an information recording / reproducing apparatus used in the first embodiment of the present invention. In FIG. 1, reference numeral 31 denotes an information recording / reproducing apparatus (hereinafter referred to as a drive) for recording and reproducing information on an information recording medium. The drive 31 is connected to a host computer 32 of a higher-level control device, and records and reproduces information under the control of the host computer 32. As an information recording medium, the optical card 1 shown in FIGS. 37 drives a transport mechanism (not shown) to introduce the optical card 1 into a predetermined position in the drive 31, reciprocates the optical card 1 in the R direction at the predetermined position, and further moves the optical card 1 out of the machine. This is a card feed motor for discharging paper to the printer. Reference numeral 38 denotes a light beam irradiation optical system including a semiconductor laser as a light source, and irradiates the optical card 1 with a light beam of the light source focused on a minute light spot when recording and reproducing information.

Reference numeral 39 denotes a photodetector for detecting light reflected from the optical card 1; and 40, a part of the light beam irradiation optical system 38, which drives a part of the light beam irradiating optical system 38, to shift the focus position of the light spot on the optical card 1 to Z. AF actuator for performing autofocus control by moving in the direction, that is, the direction perpendicular to the optical card surface,
Reference numeral 41 denotes an AT actuator for driving a part of the light beam irradiation optical system 38 to move a light spot on the optical card 1 in the Y direction, that is, in a direction orthogonal to the information track of the optical card, thereby performing an automatic tracking control. It is. An optical head 50 includes the light beam irradiation optical system 38, the photodetector 39, the AF actuator 40, and the AT actuator 41. Numeral 36 denotes a head feed motor for moving the optical head 50 in the Y direction to access the light spot to a desired track.

The MPU 33 is a processor circuit for controlling each unit in the drive 31, and has a built-in ROM and RAM. The MPU 33 controls a head feed motor 36, a card feed motor 37, and the like, and transmits and receives data to and from the host computer 32. The AT / AF control circuit 34 drives the AF actuator 40 and the AT actuator 41 based on the output signal from the photodetector 39 so that the light spot from the light beam irradiation optical system 38 is focused on the card surface. In addition, auto focus control and auto tracking control are performed so that the light spot scans following the information track.

The modulation / demodulation circuit 35 is a circuit for modulating recording information under the control of the MPU 33 and demodulating reproduction information. At the time of recording information, the recording data from the host computer 32 is modulated by the modulation / demodulation circuit 33, the light source in the light beam irradiation optical system 38 is driven according to the modulation signal, and the intensity-modulated light beam is scanned on the information track. By doing so, information is recorded on the optical card 1.

At the time of information reproduction, a light beam for reproduction is irradiated onto the information track of the optical card 1 from the light beam irradiation optical system 38, and the light detector 39 detects the reflected light from the optical card 1. Then, a photodetector 39 is provided by the modulation / demodulation circuit 35.
The recorded information is reproduced by performing predetermined signal processing such as binarization and demodulation based on the signal. When information is recorded, ECC is added to the data for recording.
As the CC, for example, a Reed-Solomon double correction code is used. Also, when verifying is performed at the time of recording, inspection is performed with a lower correction ability than at the time of reproduction, and recording is performed more reliably.

Next, the information reproducing method according to the present embodiment will be described in detail with reference to the flowchart of FIG. In addition,
In the present embodiment, a case will be described as an example in which file data of the optical card 1 on which a file F1 having a size of two sectors is recorded as shown in FIG. Further, it is assumed that the data of the file F1 is recorded in accordance with the flow of FIG. 9, and the recording method of FIG. Further, the optical card shown in FIG.
The card management information A, the replacement information management area B, and the directory area C of the optical card 1 are read into a memory in the MPU 33 prior to reproduction of the file data. It is assumed that

In FIG. 2, first, when a command to reproduce the file F1 is issued from the host computer 32 to the drive 31, the MPU 33 performs a process of reproducing the data of the file F1 for each sector. First, it is determined whether or not the first sector at the head has been replaced with reference to the replacement management information (S201). Since the first sector of the file F1 has not been replaced as described above, the sector 40 in which the data of the first sector of the data area D is recorded in S202.
Read ₁ data. At this time, the data is read by the double correction, and then the result of the double correction is determined (S
202). As a result of the double correction, if there is no error, the process ends normally. If there is an uncorrectable error, the process ends with an error.

Next, returning to S201, it is determined whether or not the data of the second sector of the file F1 has been replaced. Since the second sector of the file F1 is replaced by a verify error during recording, reading the sector 50 ₁ data of the second sector of data replacement area is recorded (S204). At this time, data is read out by performing the double correction in the same manner, and the result of the double correction is determined (S20).
5). If there is no error terminates normally, when there is an uncorrectable error, the sector 40 _{and second} data areas D is a replacement source proceeds to S202 reads performed double corrections. In this case, the sector 40 ₂ is replacement source is very likely to read data normally be reproduced by a higher double correction correction capability at the time of reproduction from the verification by the single correction after recording an error. Here, if there is an uncorrectable error, the process ends with an error. If the error can be corrected, the process ends normally. Thus, when an error occurs during the reproduction of the data replacement area, by reproducing the replacement source data recorded in the data area, there is a high possibility that the data can be normally reproduced. Can be remedied.

Next, a second embodiment of the present invention will be described. In the present embodiment, as shown in FIG. 13, a case will be described as an example in which an optical card on which data of a file F2 having the size of three sectors of the first to third sectors is recorded. It is also assumed that the file F2 is recorded according to the flowchart of FIG. 12, and that the optical card of FIG. 13 is once taken out of the drive 31 and inserted into the drive 31 again. It is also assumed that the card management information A, the replacement information management area B, and the directory area C of the optical card 1 have been read into the memory in the MPU 33 prior to the reproduction of the file data.

FIG. 3 is a flowchart showing the information reproducing method according to this embodiment. This will be described in conjunction with FIG. In FIG. 3, when the host computer 32 issues a command to reproduce the file F2 to the drive 31, the MPU 33 refers to the replacement management information to determine whether the data in the first sector of the file F2 has been replaced. Judge (S30
1). Since the first sector of the file F2 has not been replaced as described above reads the sector 40 ₁ data of the first sector of the data area D is recorded (S30
2). At this time, the data is read by the double correction, and the result of the double correction is determined (S303). As a result of the double correction, the process ends normally if there is no error, and ends if there is an uncorrectable error.

Next, it is determined whether or not the data of the second sector of the file F2 has been replaced (S301).
Since the second sector of the file F2 has been replaced due to the verify error at the time of recording as described above, the sector 5 in which the data of the second sector of the data replacement area is recorded.
0 ₁ read (S304). At this time, the data is read out by performing the double correction, and the result of the double correction is determined (S3).
05). If there is no error, the process ends normally. If there is an uncorrectable error, the process advances to step S306 to determine whether the replacement process of the second sector is a replacement due to a verify error or a replacement due to a data rewrite request. to decide. This is determined based on the replacement type included in the replacement management information. If it ended in error if replacement by rewriting request, since when this is the replacement by verify error, the sector 40 _{and second} data areas D is a replacement source in S302 reads performed double corrections. Here, the sector 40 ₂ a replacement source is from verification by single correction after recording an error, it is very likely that data is normally read when reproducing by having higher correction capability double correction during reproduction . If there is an uncorrectable error, the process ends with an error. If the error can be corrected, the process ends normally.

Next, it is determined whether or not the data of the third sector of the file F2 has been replaced (S301).
The sector because it is replaced by a rewrite request as described above, reads the sector 50 ₂ data of the third sector of data replacement area is recorded in S304. At this time, data is read out by performing the double correction in the same manner, and the result of the double correction is determined (S305). As a result of the double correction,
If there is no error, the process ends normally. If there is an uncorrectable error, it is determined in step S306 whether the third sector replacement processing is replacement due to a verify error or data replacement request. Since the third sector is replaced by a rewrite request, the error is terminated as it is. In the present embodiment, as in the first embodiment, the probability that data can be reproduced can be increased, and when the replacement destination of the replacement process due to a rewrite request cannot be reproduced due to dust or the like, the replacement source should not be accessed. Accordingly, error processing can be performed quickly.

Next, a third embodiment of the present invention will be described. In the present embodiment, it is assumed that the data due to the recording error in the data area and the data due to the scan error are replaced in the data replacement area. Replacement type information indicating whether the replacement is due to an error is included in the replacement management information and recorded. This recording method will be briefly described with reference to FIGS.
In this case, it is assumed that a file F2 having a size corresponding to three sectors of the first to third sectors is recorded on the optical card 1 in which nothing is recorded other than the card management area.

In FIG. 16, first, the data of the first sector of the file F2 is recorded in the _first sector 401 of the data area as shown in FIG. 17 (S1601). Next, it is determined whether or not the track scan operation has been performed normally (S
1602) Here, it is assumed that the scanning operation has been normally performed, and the flow advances to S1603 to perform verification by single correction in order to confirm whether data has been normally recorded. Next, the result of the verification is determined (S160).
4) In this case, the process is terminated assuming that the recording has been normally performed.

Next, to record data of the second sector of the file F2 to the sector 40 ₂ of the data area as shown in FIG. 17 (S1601). Also, it is determined whether or not the track scanning operation has been performed normally (S1602), and at this time, verification is performed by single correction assuming that the scanning operation has been performed normally (S1603). Here, sector 40
₂ is assumed results of single correction is an error, the data of the second sector is recorded in the sector 50 ₁ data spare area E as shown in FIG. 17 for performing the replacement process (S16
05). Moreover, by recording the replacement management information on replacement since replacement sector 40 ₂ of the data area D in the data replacement area E to the sector 20 ₁ of the replacement management information area B as shown in FIG. 17 (S1606), and ends the process .

[0044] Figure 4 shows a replacement management information in the sector 20 _1. Replacement type records the X indicating the replacement by verification error, replacement source address and replacement destination address records an address of the sector 40 ₂ and 50 _1. Next, the data of the third sector of the file F2 is shown in FIG.
7 is recorded in the sector 40 ₃ of the data area as (S1
601). It is determined whether the track scan operation has been performed normally (S1602). At this time, the process proceeds to S1605 on the assumption that a scan error has occurred in which the scan operation cannot be performed normally.

[0045] In S1605 the data of the third sector is recorded in the sector 50 _{and second} data spare area E as shown in FIG. 17 performs replacement processing. Also, it records the replacement management information on the replacement process in the sector 20 ₂ of the replacement management information area B as shown in FIG. 17 (S1606). Figure 5 shows a replacement management information of the sector 20 _2. Replacement type records the Z indicating that the replacement by the scan error, replacement source address and replacement destination address sector 40 ₃ and 50 ₂
Record the address of Further, a directory for managing the data files F2 in the directory area C after the data recording completion of the file F2 is recorded sector 30 _1.

Next, a method for reproducing the information of the optical card 17 on which the data is recorded as described above will be described. FIG.
5 is a flowchart illustrating an information reproducing method according to the present embodiment. This will be described in conjunction with FIG. 1 and FIG. It is assumed that the optical card of FIG. 17 on which data is recorded is once taken out of the drive 31 and inserted again into the drive 31, and the card management information A, the replacement information management area B, and the directory area C of the optical card 17 are stored. Is read into the memory in the MPU 33 prior to the reproduction of the file data.

In FIG. 6, when the host computer 32 issues a command to reproduce the file F2 to the drive 31, the MPU 33 refers to the replacement management information to determine whether the data in the first sector at the head has been replaced. It is determined whether or not it is (S601). The first sector of the file F2 reads sector 40 ₁ data of the first sector of the data area D are recorded because not replaced as described above (S602), at this time, the data by a double correction read out. In addition, the result of the double correction is determined (S603). If there is no error, the process ends normally. If there is an uncorrectable error, the process ends with an error.

Next, it is determined whether or not the data of the second sector has been replaced (S601). Second sector reads sector 50 ₁ data of the second sector of because it is replaced by the verify error in recording data replacement area are recorded as described above (S604). At this time, the data is read out by performing the double correction, and the result of the double correction is determined (S605). If there is no error, the process ends normally. However, if there is an uncorrectable error, it is determined whether the replacement process is a replacement by a verify error or a scan error by referring to the replacement management information area. (S606). In this case, the replacement type of the second sector in the replacement management information is recorded as X as shown in FIG. 4 and replacement is performed due to a verification error.
Proceeding to S602, sector 4 of the data area D as the replacement source
0 ₂ read by performing a double correction, determines the results of a double correction (S603). Here, the replacement source sector 40
₂ because verification by single correction after recording an error is very likely to read data normally be reproduced by a higher double correction correction capability at the time of reproduction. If there is an uncorrectable error, the process ends with an error. If the error can be corrected, the process ends normally.

Next, it is determined whether or not the data of the third sector of the file F2 has been replaced (S601). Since the third sector has been replaced due to the scan error as described above, the flow advances to S604. , Data replacement area E
Sector 50 ₂ in which the data of the third sector is recorded.
Is read. At this time, the data is read out by performing the double correction, and the result of the double correction is determined (S605). If there is no error in the result of the double correction, the process ends normally. If there is an uncorrectable error, it is determined in S606 whether the replacement process is replacement by a verify error or replacement by a scan error by referring to replacement management information. The replacement type of the third sector in the replacement management information is recorded as Z as shown in FIG. 5, and the replacement is performed due to a scan error, and the error is ended as it is.
In the present embodiment, as in the first and second embodiments, it is possible to increase the probability that data can be reproduced. In addition, at the time of data recording, a replacement type of a verify error or a scan error is recorded in the replacement management information. Therefore, when reproducing data, there is no access to the replacement source sector where nothing is recorded in case of replacement due to scan error,
Error processing can be performed quickly.

In the above embodiment, the verification is performed by the single correction and the reproduction is performed by the double correction. However, the present invention is not limited to this. For example, if the error correction capability at the time of reproduction is set higher than the error correction capability at the time of verification, other correction methods may be combined.

[0051]

As described above, according to the present invention, when an error occurs when reading the data replacement area, the replacement source data recorded in the data area is reproduced by referring to the replacement management information. As a result, the replacement source originally had an error due to verification with lower correction ability than during playback, so if it was played back with a higher correction ability during playback, there is a high possibility that data can be played back normally, and conventional playback was not possible Data can be rescued. Also, it is determined whether replacement is due to a verification error or replacement due to a rewrite request, and when replacement is due to a verification error, the replacement source of the data area is reproduced. Data can be rescued. Further, by determining whether replacement is due to a verification error or replacement due to a scan error, at the time of replacement due to a verification error, by reproducing the replacement source of the data area, there is a high possibility that the data can be similarly reproduced, and data that could not be read in the past Can be remedied.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of an information recording / reproducing system used for an information reproducing method of the present invention.

FIG. 2 is a flowchart showing a first embodiment of the information reproducing method of the present invention.

FIG. 3 is a flowchart showing a second embodiment of the information reproducing method of the present invention.

FIG. 4 is a diagram showing replacement management information when the replacement type is a verify error.

FIG. 5 is a diagram showing replacement management information when the replacement type is a scan error.

FIG. 6 is a flowchart showing a third embodiment of the information reproducing method of the present invention.

FIG. 7 is a diagram illustrating an example of a directory.

FIG. 8 is a diagram showing an example of an optical card on which file data is recorded.

FIG. 9 is a flowchart illustrating an example of a conventional method of recording file data on an optical card.

FIG. 10 is a diagram showing replacement management information used in the recording method of FIG. 9;

FIG. 11 is a flowchart showing an example of a conventional method for reproducing file data of an optical card.

FIG. 12 is a flowchart showing another conventional information recording method.

13 is a diagram showing an optical card on which file data is recorded by the recording method of FIG.

FIG. 14 is a diagram showing replacement management information used in the recording method of FIG.

FIG. 15 is a diagram showing replacement management information used in the recording method of FIG.

FIG. 16 is a flowchart showing another conventional information recording method.

17 is a diagram showing an optical card on which file data is recorded by the recording method of FIG.

18 is a diagram showing replacement management information used in the recording method of FIG.

[Explanation of symbols]

 1 optical card 31 information recording / reproducing device (drive) 32 host computer 33 MPU A card management area B replacement information management area C directory area D data area E data replacement area

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/18 572 G11B 20/18 572C 572H 27/10 27/10 B

Claims (3)

[Claims] 1. A data area for recording data, a data replacement area for replacing data due to a recording error in the data area, and a replacement management area for recording replacement management information including a replacement source address and a replacement destination address. Using the recorded medium, the data area and the data replacement area are recorded with an error correction code including the error correction code, and the data recorded by performing the verification is reproduced with a correction capability higher than the error correction capability at the time of the verification. In the method, when an error occurs when reading data in the data replacement area, the replacement management area is referred to and replacement source data recorded in the data area is reproduced. 2. A data area for recording data; a data replacement area for recording data due to a recording error in the data area and data in response to a rewrite request for data already recorded in the data area; a replacement source address; Using a recording medium having a replacement management area for recording replacement management information including a destination address and replacement type information, the data area and the data replacement area are recorded with an error correction code, and are recorded by performing verification. In the information reproducing method for reproducing the read data with a correction capability higher than the error correction capability at the time of the verification, if an error occurs when reading data in the data replacement region, a read error is read by referring to the replacement management region. Whether the data was replaced due to a verify error or was replaced due to a rewrite request Determining whether the data has been replaced due to a verify error, and reproducing the replacement source data recorded in the data area. 3. A data area for recording data, a data replacement area for recording data due to a recording error in the data area and data due to a scan error at the time of recording, and a replacement source address, a replacement destination address, and replacement type information. Using a recording medium provided with a replacement management area for recording replacement management information, the data area and the data replacement area are recorded with an error correction code, and the data recorded by performing the verification is replaced with an error at the time of the verification. In an information reproducing method of reproducing with a higher correcting ability than the correcting ability,
When an error occurs when reading data in the data replacement area, referring to the replacement management area, it is determined whether the data of the read error has been replaced by a verify error or replaced by a scan error,
An information reproducing method, characterized in that when replacement has been performed due to a verify error, replacement source data recorded in the data area is reproduced.