JPH03192436A - Information recording and reproducing system - Google Patents

Abstract

PURPOSE:To utilize a data file, which is not equipped with directory data, again by newly preparing the directory data and recording the data to a directory recording area when there is the data file, which is not equipped with the directory data, in a data file recording area. CONSTITUTION:Before writing the next data file, final directory data 1 of the file directory recording area are read out and a data write pointer M is calculated. When the data file recording area after the pointer M is not an unrecorded area, the data file is read out until the unrecorded area is detected. The directory information of a float data file 2 not to prepare the directory are calculated from the leading address of the unrecorded area and the pointer M, and recorded to the directory recording area and the leading address of the obtained unrecoded area is defined as a next write pointer N. Thus, since the contents of the float directory data are analyzed, the data file 2 interrupted recording can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large-capacity file memory device, and particularly to a recording/reproducing method for an information recording medium such as a write-once optical disc.

['Conventional technology]

Conventionally, an optical disk device using an original disk is known as a large-capacity file memory device.

The write-once optical disk device, which can be written only once, is the instep of this original disk device, and the write-once optical disk device can be written to the location of the same physical address.
When data is written again (override), the data recorded at the location of the physical address is destroyed.

In a write-once optical disc, during normal playback, directory data that manages addresses indicating the recording positions of data files is used to prevent data from being written to the same physical address again.

However, the directory data corresponds to the data file, and its contents are written after writing of the data file is completed and the data file is closed.

Therefore, if the recording operation is stopped before the data file is closed due to power outage, media replacement, etc., directory data for the data file will not be created. Therefore, even if a data file exists, it is not known, and there is a risk that data will be written to the same address again. As a method for preventing this, Japanese Patent Application Laid-Open No. 53-7518 can be cited.

FIG. 2 is a diagram showing the state of data recording on an optical disc of an optical disc system in a conventional example.

In FIG. 2, the optical disc is made up of a file directory recording area for recording recording information of data files, etc., and a data file recording area for recording data files.

data file (1), data file [,2),
Data file [3] is a normally recorded data file, and directory data [1], directory data [2], and directory data [3] are data file [1], data file [2], and directory data [2], respectively. This is directory information for data file [3]. Furthermore, data file [4] is a data file for which directory data has not been generated due to a power outage or the like, and L is the start address pointer of the data file recording area where writing of the next data should begin.

In this method, when writing a data file to an optical disc, prior to writing the data file,
By detecting the recorded area in the data file recording area of the optical disc, the data file (
4) is skipped and the import pointer L of the next data file is obtained. It is said that by writing a data file following this write pointer L, it is possible to prevent double writing to the same address.

[Problem to be solved by the invention]

In the conventional method described above, by skipping the data file recording area that does not have directory data caused by a power outage, etc., and filling in the next data file,
Although it is possible to prevent double writing of data, there is a problem in that a data file that does not have directory data cannot be used, resulting in poor usage efficiency of the optical disc.

In addition, in the conventional method, to detect the data writable area, the data file recording area is detected sequentially from the beginning, but if the data file distribution area that has already been written is large, the data write area is detected in order. It takes a long time to detect the possible area.

An object of the present invention is to provide an information recording and reproducing system that can efficiently prevent double writing of data and reuse data files that do not have directory data in an information recording and reproducing system that has an information recording medium such as a write-once optical disk. Our goal is to provide the following.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an information recording medium consisting of a data file recording area for recording data files and a file builf (IJ) recording area for recording directory data corresponding to the data files. , an information recording and reproducing system that records/reproduces on the information recording medium, when recording a data file on the information recording medium, detects an unrecorded area in the data file recording area, and writes the data file in the unrecorded area. If there is a data file that does not have directory data in the data file recording area, create new directory data for the data file that does not have the directory data, and store the directory data in the file directory recording area Iζ. Record.

Further, the present invention provides that when recording a data file on the information recording medium, from the data file corresponding to the last directory data recorded in the file directory recording area, unrecorded data in the data file recording area is recorded. An area is detected and a data file is recorded in the unrecorded area.

Further, the present invention provides that, when recording a data file in an unrecorded area of the information recording medium, each time data of a larger size is recorded in the data file, directory data of the recorded data is temporarily created; The temporarily created directory data may be recorded in the file builf l-IJ recording area.

Furthermore, the present invention temporarily creates information indicating that there are a plurality of data files open at the same time when recording a data file in an unrecorded area of the information recording medium, and uses the temporarily created information as described above. It may also be recorded in a file directory recording area.

[Effect]

When recording a data file, an unrecorded area is always detected and then the data file is recorded in the unrecorded area, so there is no double writing of data and data destruction. Furthermore, by creating and recording directory data for a data file that does not have BUILEF h IJ data, it is possible to reuse a data file whose recording was interrupted midway.

In addition, by detecting unrecorded areas starting from the data file that corresponds to the last directory data, even if data file recording is interrupted, it is not necessary to read the data file recording area of the data file that has directory data. Therefore, the detection time can be shortened.

Furthermore, by recording a temporary directory resolution every time a certain data size is recorded, even if data file recording is interrupted, the area of data files that do not have directory data can be kept to a minimum. It will be done. Therefore, since the data file area that must be read before detecting an unrecorded area is small, the detection time can be further shortened.

〔Example〕

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

1 and 3 are diagrams illustrating an information recording and reproducing method using a write-once optical disc according to a first embodiment of the present invention, and FIG. 1 is a diagram showing a data recording state on the write-once optical disc, FIG. 3 is a block diagram showing the hardware configuration of this embodiment.

Addendum 2 to Figure i13! ! ! Original disk system 2
is the original disk drive 3. It is composed of a read/write control section 4, an interface control section 5, and 1.

The interface control unit 5 receives capture commands such as convolution commands and read commands from the external control system 6, and controls the read/write control unit 4 in accordance with these commands.

data! In the case of + [, the external control system 6 records the data file to be collected and its management information (file name 1 creation date and time, file size, record The interface control unit 5 is provided with directory data such as an address, etc.).

Under the control of the interface control unit 5, the read/write control unit 4 puts the original disk drive 3 into storage mode and transfers the data files and directory data supplied from the external control system 6 onto the write-once optical disk 1. Praise is performed at the address specified by the above-mentioned bud address data.

In addition, in the case of data reproduction, a start-up command and the like are supplied from the external control system 6 to the interface control section 5, and in the same way, directory data is started out from the write-once optical disc 1. Next, the file name of the data file is specified, the address of the data file is specified from the corresponding B-REF I-IJ data, and the data file is read from the write-once optical disc 1.

The read data file is supplied to an external control system 6 via a read/write controller 4 and an interface controller 5.

Next, the data recording state of the write-once optical disc 1 in the present 5I6 embodiment will be explained with reference to FIG.

The write-once optical disc 1 according to the second embodiment includes a file directory recording area in which directory data is recorded;
It consists of a data file recording area where data files are recorded.

Directory data exists for each data file,
As mentioned above, this is data indicating the start address, file name, file size, etc. of the data file. As a result, the data file is recorded in the data file recording area, and the corresponding directory data is recorded in the file directory recording I11 area.

FIG. 1(a) shows the data recording state of the write-once optical disc 1 when data file [1] is normally recorded.

Directory data [1] is directory information of data file [1], and is recorded after data file [1] is recorded on write-once optical disc l.

Normally, when writing the next data file after data file [l], external control system 6 obtains a data convolution pointer from directory data [1].

The obtained data import pointer is stored in an internal memory (not shown) of the write-once optical disc system 2. Based on the data storage pointer stored in the internal memory of the write-once optical disk system 2, the next data file is stored. Note that the data storage pointer is set when the write-once optical disk system 2 is started up, or
It shall be obtained before importing the data file.

However, if the data file storage operation is stopped due to an unconditional interruption of execution such as a power outage or a hard reset while writing a data file, the directory data for the data file will not be recorded on the write-once optical disc 1.

This shows the data recording state of the write-once optical disc 1 when the writing of the data file [2] is terminated midway due to a power outage or the like while the data file [2] is being written after writing the data file (1). This is shown in FIG. 1(b).

After this, when storing the next data file, the external control system 6 determines the position of the next data loading pointer to be the position M in FIG. 1(b) based on the directory data [1]. I'll check it out. When this genius tries to load the next data file, data file [2] will be destroyed. Therefore, it is necessary to obtain a data write pointer that skips the recording area of data file [2].

Hereinafter, a method for determining a correct data write pointer will be explained using the flowchart shown in FIG.

Immediately after restarting after a power outage or before writing the next data file, execution of the routine starts from step 401 in FIG. 4.

In step 401, the last block l-'J data in the file directory recording area is stored in the external control system 6.
reads out. In step 402, a data write pointer is determined from the directory data, and the determined data write pointer is stored in the internal memory. This data write pointer is M shown in FIG. 1(b). Subsequently, in step 403, the data file recording area is read from the position of the data write pointer M obtained in step 402.

Next, in step 404, it is checked whether the data file recording area after the data write pointer M is an unrecorded area.

If the data file recording area after the data write pointer M is an unrecorded area, the previous data file has been recorded normally and the data write pointer is a correct data write pointer, so this routine ends.

If the data file recording area after the data write pointer M is not an unrecorded area, the process advances to step 405.

In step 405, in order to skip the data file recording area in which a data file for which a directory has not been created (hereinafter referred to as a float data file) is recorded, data file reading is continued until an unrecorded area is detected. conduct. If an unrecorded area is detected in step 405, the process proceeds to step 406 to obtain the start address of the unrecorded area. In step 407, the directory information of the float data file is obtained from the data write pointer M and the start address of the unrecorded area obtained in step 406.

In step 408, the directory information obtained in step 407 is recorded in the file directory recording area. In step 409, the start address of the unrecorded area obtained in step 406 is stored in the internal memory of the write-once optical disk system 2 as the write pointer N of the next data file, and this routine ends.

Figure 1 (C) shows the directory data (
Hereinafter, this will be referred to as float directory data. ) shows the data recording state when recorded.

Therefore, when writing the next data file, by writing the next data file from the address indicated by the write pointer N in the internal memory of the write-once optical disk system 2, data destruction due to double writing of data will not occur. .

As described above, data destruction due to double writing of data can be prevented, and the external control system 6
By analyzing the contents of the recorded float directory data, it is possible to use the data file [2] whose recording was interrupted.

In this embodiment, the explanation is given on the assumption that only one data file is being opened, but when multiple data files are being opened and written at the same time,
If data file writing is not completed normally due to power outage, etc., create float directory data for the multiple float data files as one float data file and record it in the file directory recording area. . The external control system 6 can analyze the contents of this float directory data and restore each data file.

As described above, according to this embodiment, it is possible to prevent the data file from being written again in the area where the data file has already been recorded.Furthermore, since it is possible to reuse the float data file, it is possible to prevent the write-once optical disc from writing once again. This will increase the utilization efficiency of 1.

In this embodiment, the write-once type optical disk system 2 has been described, but even in a system using a replaceable information recording medium, when recording and reproducing data using the write-once method, the following steps are required.
The present invention can be applied.

Next, a second embodiment of the present invention will be described.・5th
The figure shows a write-once optical disc l in a second embodiment of the present invention.
FIG. 3 is a diagram showing a data recording state of FIG.

The hardware configuration of this embodiment is the same as that shown in FIG.

The information recording medium in this embodiment is a write-once optical disc 1.
The data recording area of this write-once optical disc l consists of a file directory recording area for recording directory data and a data file recording area for recording data files. Further, it is assumed that the number of open data files is one.

In the i@1 embodiment, when reading a data file recording area and detecting an unrecorded area from a data ink pointer obtained based on directory data,
If there is a float data file caused by a power outage, etc., the data file recording area will continue to be read until the end of the float data file is detected. However, if the float data file has a large capacity, it will be It takes a lot of time.

Therefore, in this embodiment, a recording enrichment method for shortening the time for detecting unrecorded areas will be described.

FIG. 5 is a diagram showing the data recording state of the write-once optical disc 1 in this embodiment when a data file is normally recorded.

In the figure, A is the first block of the blocks in which the data file is divided into fixed sizes, B is the Nth block, and C is the last (N+1st) block. However, the last block C is the same size as the other blocks or smaller than the other blocks.

Further, FIG. 6 is a flowchart of the main operation when no interruption occurs during data file recording.

Hereinafter, a case in which data file recording is normally performed in this embodiment will be explained using FIG. 5(a) and FIG. 6.

In step 601, a data file is stored in a data file recording area. In step 602, it is determined whether recording of the data file has ended.

If the Rtm of the data file is completed, step 6
If not, proceed to step 603.

In step 603, it is determined whether the recorded data size has reached a certain size, and if it is a certain size, the process proceeds to step 604; if it is not a certain size, the process proceeds to step 601, where the data is recorded. Wear.

In step 604, when a certain size (block) has been extracted, temporary directory data, which is directory information up to that address, is created. next,
In step 605, the temporary directory data is recorded in the file directory recording area.

In FIG. 5(a), the directory information of the first block A is temporary directory data (1).

Similarly, temporary directory data up to the next block [2] 9 Temporary directory data up to the next block [3] ..., i & temporary directory data from the first block A to the Nth block B ( n).

If writing of the last block C is completed normally,
In step 606, the directory data of the data file is written following the temporary directory data (n) in the file directory recording area.

As a result, when writing the next data file, the address at which the next data file should be stored can be found by referring to the directory data.

Next, a case will be described in which writing of data files is interrupted due to a power outage or the like while data files are being sorted while creating temporary directory data in the same manner.

In FIG. 5(b), when writing interruption occurs during writing of block C, temporary directory data (m) up to block B is created in the file directory recording area.

FIG. 7 is a flowchart of the operation after the arranging is interrupted during the arranging of the data file.

The operation before writing the next data file after interrupting data file writing will be described below with reference to FIG. 5(b) and FIG. 7.

Immediately after restarting after a power outage or before writing the next data file, the external control system 6 writes the last temporary directory data (in FIG. 5(b), the temporary directory data ( m)).

Next, in step 702, a write pointer is obtained from the temporary directory data and stored in the internal memory of the write-once optical disc system 2.

FIG. 5 (Temporary current of block C in FIG. 5) Since there is no IJ data, the external control system 6 confirms that the scanning pointer is at the position of pointer P in FIG. 5(b). .

Therefore, in order to obtain the correct write pointer Q, in step 703, the data file recording area is read from the position of the write pointer P.

Next, in step 704, it is determined whether the data file recording area after the categorization pointer P is an unrecorded area.

If it is an unrecorded area, this means that the data file has been written normally as described above, and this routine ends.

If the data file recording area after the write pointer P is not an unrecorded area, the process advances to step 705, and the data file recording area is read until an unrecorded area is detected. When the unrecorded area is @ output, the start address of the unrecorded area is acquired in step 706.

Next, in step 707, directory information for the float data file is created from the last temporary directory data (temporary directory data [m] in the fifth prisoner) and the start address of the unrecorded area obtained in step 706. do.

Next, in step 708, the directory information obtained in step 707 is recorded in the file directory recording area. In addition, in step 709, the start address of the unrecorded area obtained in step 706 is stored in the internal memory of the write-once optical disk system 2 as the storage pointer Q of the next data file, and this routine ends. do.

That is, in this embodiment, since the data file recording area is read from the position of the write pointer P, the amount of data read at the beginning of the undistributed area is smaller than in the first embodiment, and the amount of data read at the beginning of the undistributed area is smaller than in the first embodiment. Address detection time can be shortened.

Also, the directory information of the float data file can be obtained from the last temporary directory data and the start address of the unrecorded area, so if this directory information is recorded in the file directory recording area, the external control system 6 can The data file is now available.

However, in this embodiment, if writing is interrupted while multiple data files are opened and loaded at the same time, the data block of which data file is the last data block. Since it cannot be determined, float directory data is created using the data block as a float data file and recorded in the file directory recording area. The external control system 6 enables the use of the float data file by analyzing the float data file based on the contents of the float directory data.

Next, a third embodiment of the present invention will be described.

FIG. 8 is a diagram showing the data recording state of the information recording medium in the third embodiment of the present invention.

In contrast to the information recording medium in the second embodiment, which was a write-once fluorescent disk l, this embodiment uses a rewritable information recording medium, and this information recording medium performs write-once data recording and reproduction. This is a record of cases related to puerina.

In the second embodiment, since the information recording medium is a recordable temperature,
It was necessary to secure an area for temporary directory data equal to the number of temporary directory data. However, in this embodiment, since the information recording medium can be replaced, the temporary directory data can be recorded over the previous temporary directory data.

Therefore, according to this embodiment, similarly to the second embodiment, 231 writing of data is prevented and a float data file can be used. Furthermore, by recording temporary directory data, the time required to detect an unrecorded area can be shortened.

Furthermore, since the information recording medium is of a rewritable type, the file directory recording area used for temporary directory data can be minimized, and the efficiency of use of the information recording medium can be improved.

Next, a fourth embodiment of the present invention will be described.

As mentioned above, the handling of float data files differs depending on the number of data files that are open at the same time, but in the above embodiment, after data recording is interrupted due to a power outage, etc., the data that was open before the interruption is There is no mention of how to find the number of files.

This embodiment relates to a data recording and reproducing method in which a method for determining the number of data files opened at the same time is added so that processing after data file writing is interrupted is carried out in a manner according to the number of data files.

FIG. 9 is a diagram showing the data recording state of the information recording medium in this embodiment.

In this embodiment, when a data file is opened, in order to know the number of opened data files,
Record the open file pointer of each data file in the file directory recording area. An open file pointer is dummy directory data that indicates that the data file has been opened.
Contains information such as the file name of the opened data file.

If the data recording is completed normally, the directory data paired with the open file pointer is recorded in the file directory recording area.

If data file recording is interrupted due to a power outage, etc., data files that were open at the same time but have not finished recording will be moved to the open file pointer and the recorded directory. It can be determined from the data. In other words, a data file that has an open file pointer but no directory data is a data file for which self-recording of the data file has not been completed. As a result, if there is only one open file pointer, or if there is only one data file for which the open file pointer and directory data are not paired, the float data file belongs to that data file. , create directory data for the data file including the float data file, and record it in the file directory recording area.

Also, if there are multiple data files in which the open file pointer and directory data are not paired, the float data file cannot determine which data file the data belongs to, so the directory data is treated as a single float data file. is created and recorded in the file directory recording area.

As described above, in this embodiment, recording of a data file is interrupted by checking whether the open file pointer recorded in the IJ recording area is paired with the directory data. This allows you to know the number of data files that have been created, making it easier to process each one.

〔Effect of the invention〕

As discussed above, the present invention has the following effects.

(1) Since an unrecorded area is detected and a data file is recorded from the unrecorded area, data destruction due to double writing of data does not occur.

(2) If recording is interrupted midway due to a power outage, etc., directory data for data files that do not have directory data is created and recorded in the file directory recording area, so the data file can be used for 4U, and the information recording medium improves the efficiency of use.

(3) When recording data files, for each fixed size,
By creating and recording temporary directory data for recorded areas, even if recording is interrupted midway, the data file area that does not have directory data can be minimized, and unrecorded areas can be detected. You can reduce the time it takes to do so.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the data recording state of the write-once optical disc in the first embodiment of the present invention, FIG. 2 is a diagram showing the data recording state of the write-once optical disc in the first embodiment, and FIG. A block diagram showing the hardware configuration of the first embodiment,
FIG. 4 is a flowchart showing the operation of the first embodiment, I
@Figure 5 is a diagram showing the data recording state of the write-once optical disc in the second embodiment of the present invention, Figure 6 is a flowchart showing the operation of the second embodiment, and Figure 7 is the data recording state in the second embodiment. Flowchart showing the next data file write operation after interruption of file writing, FIG. 8 is a diagram showing the data recording state of the information recording medium in the third embodiment of the present invention, and FIG. 9 is a diagram showing the data recording state of the information recording medium in the third embodiment of the present invention. FIG. 7 is a diagram showing a data recording state of an information recording medium in a fourth embodiment. 1...Writable optical disc 2/Writable optical disc system 3...Optical disc drive 4...Read/write control unit 5...Interface revision] Both parts 6...External control system porridge 1 Figure 2 Figure 〆(b) 5L) Figure 5 (cL) (b) Figure 46 of P11D 51'16

Claims (1)

[Scope of Claims] 1. An information recording medium comprising a data file recording area for recording a data file and a file directory recording area for recording directory data corresponding to the data file, and recording is made on the information recording medium. /In an information recording and reproducing system for reproducing, when recording a data file on the information recording medium, an unrecorded area of the data file recording area is detected, a data file is recorded in the unrecorded area, and the data file is recorded in the unrecorded area. If there is a data file that does not have directory data in the file recording area, new directory data for the data file that does not have directory data is created, and the directory data is recorded in the file directory recording area. Information recording and playback method. 2. An information recording/reproducing device having an information recording medium consisting of a data file recording area for recording a data file and a file directory recording area for recording directory data corresponding to the data file, and recording/reproducing information on the information recording medium. In the system, when recording a data file on the information recording medium, an unrecorded area in the data file recording area is detected after the data file corresponding to the last directory data recorded in the file directory recording area. and recording a data file in the unrecorded area. 3. An information recording/reproducing device having an information recording medium consisting of a data file recording area for recording a data file and a file directory recording area for recording directory data corresponding to the data file, and recording/reproducing information on the information recording medium. In the system, when recording a data file on the information recording medium, an unrecorded area in the data file recording area is detected after the data file corresponding to the last directory data recorded in the file directory recording area. recording a data file in the unrecorded area, and if there is a data file without directory data in the data file recording area, newly creating directory data for the data file without directory data; An information recording and reproducing method characterized in that the directory data is recorded in the file directory recording area. 4. When recording a data file in the unrecorded area of the information recording medium, each time data of a certain size is recorded in the data file, temporarily create directory data for the recorded data; 4. The information recording and reproducing method according to claim 1, wherein directory data is recorded in the file directory recording area. 5. When recording a data file in the unrecorded area of the information recording medium, temporarily create information indicating that there are multiple data files open at the same time, and store the temporarily created information in the file directory recording area. 5. The information recording and reproducing method according to claim 1, wherein the information recording and reproducing method is used for recording.