JPS63179471A - Data recording method and data recording/reproducing method - Google Patents

Abstract

PURPOSE:To save the quantity of information of a recording area of a recording medium such as a floppy disk recording retrieval information by recording the recording position with an error taken place and the recording position recorded again correspondingly onto the recording medium. CONSTITUTION:A sector has an ID part 16 and a data part 17, the ID part 16 consists of address information representing the location of a sector on an optical disk 1 and a synchronizing signal, and the data part 17 consists of a 1st flag, 2nd flag representing the recording state of data, the synchronizing signal and actual data given with data error detection/correction code EDC, ECC. The inputted data is subjected to provision of error detection code EDC and an error correction code ECC at each sector and recorded on the optical disk 1 and a flag representing the presence of a recording data is given to the 1st flag of the sector recorded with the data. In recording the data, the recording start sector address of the data on the optical disk and the used sector number are stored in a retrieval information memory 10 corresponding to the key word or the like inputted to specify the data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recording method and a data recording/reproducing method when recording and reproducing data on a recording medium such as an optical disk.

[Prior art] In document file systems that use large-capacity optical disks as data recording media, search information such as keywords and file names that identify recorded data is generally associated with the recording address of this data on the recording medium. , is recorded in an external memory such as a floppy disk, and this search information is used as a clue to specify the recording address and perform a data search.

An optical disc, which is a data recording medium, is equally divided into a plurality of recording areas, so-called sectors, in the circumferential direction of the disc surface, and tracks that guide the recording and reproduction of data are provided in a spiral shape. One round is made up of a predetermined number of sectors. In this case, addresses are sequentially assigned to each sector. Furthermore, data recording uses one or multiple sectors depending on the amount of information.

By the way, optical discs, which are currently widely used in document file systems, etc., focus laser light on the disc substrate to make holes (bits), and record and reproduce data depending on the presence or absence of these bits, and the length and spacing of the bits. Therefore, once recorded data cannot be rewritten. Therefore,
If there is an error in the recorded data, the correct data is re-recorded in another recording area. The position and range of recording areas for re-recording are set in advance, but generally they are distributed evenly over the entire storage area. In other words, a predetermined number of alternative sectors for re-recording are allocated to a storage area of a predetermined number of sectors, and these are treated as one unit of data processing, and the corrected data is stored in the alternative sectors within that data processing unit. A flag or the like is attached to a sector that is re-recorded and in which an error has occurred in the recorded data. Furthermore, if an error occurs in a sector exceeding the number of alternative sectors that can be re-recorded and there is no room for re-recording, correct data is re-recorded in the recording area of another data processing unit.

Furthermore, the data recording address is recorded on an external memory such as a floppy disk at the same time as the data is recorded, in association with the search information regarding this data, but errors occur because there are not enough sectors to re-record. If the data that should be recorded in the sector that was previously recorded is re-recorded in another data processing unit,
In addition to the original recording address, this re-recording address is also associated and recorded on the floppy disk.

[Problem that the invention seeks to solve]

However, at present, the bit error rate of optical disks is higher than that of other recording media, and therefore the incidence of data re-recording due to errors in recorded data is high. In many cases, the recording area is insufficient and re-recording is performed in another data processing unit. Therefore, since the re-recording address is also recorded, the amount of address information recorded in external memory increases, and the external memory for one optical disc increases. For example, if there are multiple floppy disks, data searches must be performed on multiple floppy disks, reducing the efficiency of data searches and requiring an unnecessarily long time to reproduce data.

The present invention has been made to solve these problems, and provides a data recording method and data that prevent a decrease in the efficiency of data retrieval by reducing the amount of information in an external memory that records data retrieval information. The purpose is to provide a recording/playback method.

[Means for solving the problem] The data recording method according to the present invention records data on a recording medium, records the data recording position outside the recording medium, and reads the recorded data immediately after recording. In a data recording method that detects the recording position where a recording error has occurred, and then re-records the data to be recorded at this recording position at another recording position, it is possible to identify the recording position where the sag occurred and the re-recorded recording position. It is characterized in that it is recorded in a recording medium in association with each other.

The data recording/reproducing method according to the present invention records data on a recording medium and records the data recording position outside the recording medium, while reading out the recorded data immediately after recording and preventing recording errors from occurring. The recording position is detected and the correct data that should be recorded at this recording position is re-recorded at another recording position, while the re-recorded recording position is identified from the information of the recording position where the error occurred, and the data is recorded from the identified recording position. In a data recording/reproducing method for reproducing data, a recording position where an error occurs and a re-recorded recording position are stored in a memory in association with each other, and the recording position at which the data is re-recorded is specified based on the position information in the memory. It is characterized by

(Function) The method of the present invention records data on a recording medium such as an optical disk, records the recording position on a floppy disk, etc. outside the storage medium, and reads out the recorded data immediately after recording. Check for errors, detect the recording position where the recording error occurred, re-record the data that should be recorded at this recording position at another recording position, and make correspondence between the recording position where the error occurred and the re-recorded recording position. and record it on a recording medium.

When reproducing data, this is used to identify the re-recorded recording position and reproduce the correct data. In addition, the recording position where the error occurred and the re-recording position are associated and stored in the memory, and when the data is reproduced, if the initially specified recording position matches the position information in the memory, the re-recording position stored in the memory is The data is reproduced from the recording position, and if they do not match, the data is reproduced from the initially specified recording position.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. FIG. 1 is a block diagram showing the configuration of an optical disk file device according to the present invention. 0 In the figure, 1 is an optical disk for recording data, and its configuration will be explained according to the schematic diagram shown in FIG. The spiral track (not shown) that guides the recording and reproduction of data is part 1.
Each round has 12 sectors equally divided, and each sector includes:
Addresses are assigned sequentially along the track, and each sector is the basic unit of data recording. Furthermore, the area where data is recorded is the actual data area 13 where the data itself is recorded.
and an error sector check area 14 that records address information of required sectors in the actual data area 13.If an error occurs in data recording, correct data is stored in the required range of the actual data area 13. An alternative sector area 15 is provided for re-recording.

2 in the figure is a system control circuit which, when data to be recorded is input, temporarily stores it in an image memory (not shown), and also controls the sector address, which is the data recording position, and the sector, which is the recording range, on the optical disc 1. These sector addresses and sector numbers are given to the controller 3, and the data is sent to the encoder 4. The controller 3 compares the sector address given by the system control circuit 2 with the recording start address on the optical disc 1 read from the optical disc 1 and decoded by the decoder 8, and if they match, transmits a match signal to the laser modulation circuit. Give to 5. The encoder 4 encodes the sent data, adds necessary information to this data, and sends it to the laser modulation circuit 5.

The laser modulation circuit 5 modulates laser light emitted from a light source (not shown) into an optical signal according to data to be recorded, according to a signal from the controller 3.

The optical disc 6 transmits the modulated laser beam to the optical disk l.
The laser beam is irradiated onto a predetermined position of the optical disc 1, and data is recorded by changing the surface of the optical disc 1. The flag adding circuit 7 sends a signal to the laser modulation circuit 5 according to the data recording state, and the sent signal is recorded at a predetermined position on the optical disc 1.

Further, the encoded data recorded on the optical disc 1 is read by the optical head 6 by irradiation with weak laser light immediately after recording. The read data is sent to a decoder 8, decoded, and sent to an error correction circuit 9. Error correction circuit 9
After correcting data errors according to a predetermined method, it judges whether the correction is successful or not based on a predetermined signal, and provides the result of the judgment to the system control circuit 2. If the correction is appropriate, the system control circuit 2 ends the series of recording processing, whereas if the correction is inappropriate, the system control circuit 2 transfers the corresponding data stored in the image memory to the original data on the optical disc 1. Re-record in an area different from the recording area. It should be noted that the re-recorded data is checked in the same manner as described above to see if it was recorded correctly or not.

In addition, the search information memory 1o consists of a floppy disk and its drive device, and is input with data.
Information specifying data is stored in association with the recording address of the data on the optical disc 1, and when reproducing the recorded data, based on the input data specifying information,
The data recording address is specified.

Next, the RAM 11 temporarily stores the original recording address and the re-recording address in association with each other when data is re-recorded on the optical disc l. The address is recorded in the error sector check area 14, and when the data is reproduced, the address specified in the search information memory 10 is compared with the address information in the RAM 11, and the data is reproduced from the address according to the result. Furthermore, when the optical disc 1 that has been removed from the drive device is loaded into the drive device again,
The address information of the error sector check area 14 is stored in RAM.
Based on this address information, data is reproduced in the same manner as described above.

In this embodiment, as shown in FIG. 2, 8 sectors forming one trunk are treated as one set of data processing units, and the 8 sectors are Of these, sector 1 is set as an alternative sector for re-recording in case erroneous data is recorded in other sectors in this group. Addresses are sequentially assigned to each sector along the track in advance, and data is recorded sequentially according to the addresses. Also, the format state of each sector will be explained according to the conceptual diagram shown in Figure 3.
One sector has an ID section 16 and a data section 17, the tenth section 16 consists of a synchronization signal and address information indicating the position of the sector on the optical disc 1, and the data section 17 is a first flag indicating the recording state of data.

It consists of actual data to which a second flag, a synchronization signal, and data error detection/correction codes (EDC, ECC) are added. The input data is subjected to an error detection code (1
! DC) and an error correction code (ECC) are added to the optical disc 1 as described above, and a flag indicating that there is data to be recorded is added to each first flag of the sector in which data is recorded. When the data is recorded, the data recording start sector address and the number of used sectors on the optical disc 1 are stored in the search information memory 10 in association with the keyword input to specify the data.

When a series of data recording is completed, the recorded data is read out, decoded by the decoder 8, and then output to the error correction circuit 9 in units of sectors. The error correction circuit 9 uses error detection/correction codes (EDC, ECC) assigned to each sector.
), after making corrections within the correctable range in the system, the correction check code (CRC) is used to determine whether the correction has been passed or not, and a corresponding signal is given to the system control circuit 2. Then, the system control circuit 2 determines that the sector in which the correction has been performed appropriately is a sector in which data has been recorded correctly, while the sector in which the correction has been inappropriate is determined to be an error sector in which there is an error in data recording. , sends a signal to the flag addition circuit 7,
Information indicating an error sector is added to the second flag of the corresponding sector of the optical disc 1.

Next, the system control circuit 2 reads correct data corresponding to the recorded data of the error sector from the memory in which the input data was once stored, sends it to the encoder 4, encodes it, and re-records it on the optical disc 1. However, if there are at least the same number of unrecorded alternative sectors as the erroneous sectors in the trunk to which the sector bends, rewriting is performed in those alternative sectors. Furthermore, if the number of unrecorded alternative sectors is less than the number of error sectors, rewriting is performed in recording sectors of another track.

At this time, if the series of data spans multiple sectors, the entire series of data including the error sector is re-recorded in the recording sector of another trunk. When data is re-recorded to another trunk, the re-recording sector address (re-recording start address in the case of multiple sectors) is associated with the original address stored in the search information memory 10, and then stored in the RAM.
At the same time, the address information in the RAM 11 is encoded by the encoder 4, modulated into an optical signal by the laser modulation circuit 5, and recorded in the error sector check area 14 of the optical disc 1.

Next, when reproducing the recorded data, the recording sector address of the data specified based on the input search information is once compared with the address information stored in the RAM 11, and if there is no matching address, , access this sector address and check from the second flag of each sector whether it is an error sector or not. If the sector is not an error sector, the data in that sector is reproduced, while if it is an error sector, an alternative sector is accessed and the data is reproduced. In this embodiment, each trunk has one alternative sector, but if a plurality of alternative sectors are set, information that can specify the alternative sector to be accessed may be recorded in the second flag.

Further, if there is a matching address in the RAM 11, the re-recording sector address stored in the RAM 11 in association with this address is accessed and recorded data is stored in place of the address specified by the search information memory 10. Play.

Furthermore, when the optical disk l that has been removed from the drive device is loaded into the drive device again, all the address information in the error sector check area 14 is first read out and stored in the RAM 11, and this information is used to store the data as described above. Perform playback.

Although in this embodiment an address is assigned in advance to each sector of the optical disc 1, the same effect can be obtained even with an optical disc in which an address is assigned at the time of data recording.

〔effect〕

The method of the present invention reduces the amount of information in a recording area of a floppy disk or the like in which search information is recorded by recording the recording position of re-recorded data in correspondence with the original recording position on an optical disk and RAM. This has the excellent effect of preventing a decrease in search efficiency during data reproduction by saving information such as storing the search information for one optical disk on one floppy disk or less.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an optical disk file device according to the present invention, FIG. 2 is a schematic diagram showing the configuration of the optical disk, and FIG. 3 is a conceptual diagram showing the formatting state of one sector.

Claims (1)

[Claims] 1. Data is recorded on a recording medium, and the recording position of the data is recorded outside the recording medium, and the recorded data is read immediately after recording to find the recording position where a recording error occurred. In a data recording method that detects and re-records the data that should be recorded at this recording position at another recording position, the recording position where the error occurred and the re-recorded recording position are associated and recorded on the recording medium. A data recording method characterized by: 2. Record the data on a recording medium and record the data recording position outside the recording medium, and read the recorded data immediately after recording to detect the recording position where a recording error occurred and locate this recording position. In a data recording/reproducing method in which correct data that should be recorded is re-recorded in another recording position, while the re-recorded recording position is identified from information on the recording position where an error has occurred, and data is reproduced from the identified recording position. , Data recording/reproducing characterized in that the recording position where the error occurred and the recording position where the data was re-recorded are stored in a memory in association with each other, and the recording position where the data was re-recorded is specified based on the position information in the memory. Method.