JPH09139053A - Recording system and reproducing system for write-ones type recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to improve the efficiency of using a medium and easily reproducing the medium with a conventional CD-ROM device. SOLUTION: The directory constitution of the recording data group recorded thus far and the recording data group going to be recorded at this time is recorded on the respective virtual directories 7a, 7b,... existing at the top of second and subsequent fixed length packets 1a, 1b,.... The n-th virtual directory 7n and the n-th recording data group 8n are recorded in the (n+1)th fixed length packet 1n such a case that there is no need for writing once any more. A route directry 4, a pass table 5 and a volume discriptor 10 are then recorded in the first fixed length packet 9 based on the content of the n-th virtual directory 7n. The operation is ended by recording a read-in region 2 and a read-out region 3.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a conventional CD-RO.
The present invention relates to a recording system and a reproducing system of a write-once recording medium, for example, a CD-R disc that can be reproduced by an M device.

[0002]

2. Description of the Related Art A CD-ROM is widely used as a read-only high-capacity storage device, and its physical and logical standards are strictly defined. In recent years, the expectation for the write-once / rewritable CD-ROM is increasing, but only the write-once type is currently commercialized in terms of price and reliability.

By the way, the CD-ROM performs signal conversion called CIRC in order to improve the reliability of data. However, since this signal conversion spans a plurality of data before and after, all the data to be recorded needs to be recorded in advance on a magnetic tape, HDD, large-capacity optical disk or the like when recording. Considering how to use a general storage device, it is extremely rare that a large amount of data used in a CD-ROM must be recorded at one time. Therefore, it is required to be able to record the data several times.

As one of the solutions, there is a rule called multi-session. FIG. 17 is a schematic diagram showing the format of a medium in the case of multi-session. This regulation makes it appear that a plurality of media logically exist in one medium. Then, as a gap between the data to be recorded, 23 MB is required between the first session 99a and the second session 99b, and 14 MB is required after the second session 99b and the third session 99c. Is. Therefore, when additional recording is performed many times, the use efficiency of the storage medium is significantly reduced. Therefore, although one recording unit is effective for relatively large information, it is not suitable for handling general data.

As another solution, a standard called "Orange Book" defines a write connection method called "packet write" suitable for data. However, this standard is a physical standard and does not touch on the logical part. The rules for this logical part are "I
It is standardized by "SO9660", but this is C
It is a standard for D-ROM, that is, a case where all the data to be recorded on the medium is known in advance, and it is not intended to consider the data to be additionally written. Therefore, in order to finally allow the write-once CD-R disc to be reproduced by a general CD-ROM device, in order to make it possible to read "ISO966".
The format must conform to "0". In the standard of "ISO9660", description such as a descriptor called "volume descriptor" indicating the attribute of the medium and a "path table" indicating the positions of all directories is obligatory. Therefore, in the case of additional recording, it is necessary to temporarily store this information somewhere. A solution to such a problem is disclosed in Japanese Patent Laid-Open No. Hei 2
-214924 and Japanese Patent Application Laid-Open No. 5-265833.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Japanese Patent Laid-Open No. 4 (1994) proposes a method of temporarily recording information of a descriptor group in a virtual device and recording it in a write-once recording medium after all the data is recorded. But,
In this method, in the case of a medium that has been recorded halfway and there is a possibility of additional recording, once it is taken out from the device, the information and data necessary for recording the descriptor group of that medium are recorded. All the information that may be used must be stored in the virtual device because it is separated from the medium in which it is stored. Therefore, depending on the way of thinking of the system, the virtual device needs a certain capacity.

Further, Japanese Patent Laid-Open No. 265833/1993 proposes to record data indicating the position of information of the descriptor group in the PMA area of the write-once type CD-R. PM
The area A is an area for recording the track information called TOC, which is necessary for the CD-ROM, so that the track information is temporarily recorded. The PMA area is defined by the "Orange Book", and an area that is completely unrelated to the data on the inner circumference side of the lead-in area is used. The data recording method in the PMA area is different from the recording in the normal data area, and the position of the subcode Q is used. Since the TOC records the track information of the CD-ROM, recording the descriptor group every time the PMA is recorded means that the descriptors are additionally recorded in track units. Tracks are defined in the "Red Book", which is the most basic standard for CDs. Among them, a track-to-track gap of 150 KB is required. Also, since only 99 tracks are permitted on one medium, additional recording is limited to 99 times.

Therefore, in the methods proposed so far, there is a problem in that the amount of data that is wasted during additional recording is large, so that the use efficiency of the data is reduced and the number of additional recordings is limited. .

In order to solve the above problems in the prior art, the present invention can improve the use efficiency of the medium and record on a write-once recording medium which can be easily reproduced by a conventional CD-ROM device. It is intended to provide a method and a reproduction method.

[0010]

In order to achieve the above object, the first configuration of the recording system of the write-once type recording medium according to the present invention is capable of additionally writing in fixed length packet units and at least the route. A volume descriptor including a directory record and a path table position, a root directory recorded in the position indicated by the root directory record in the volume descriptor, and a path table position in the volume descriptor A recording method of a write-once type recording medium in which a path table recorded at a position to be recorded is recorded, and a directory of information requesting recording and a directory of already recorded information are stored in a predetermined packet of each fixed length packet. If a virtual directory to be recorded in the location is provided and it is prohibited to add data to the medium or the session later, the medium is recorded. Or directory information of the session, finally and records the recorded the root directory and path table based on the contents of the virtual directory, and performing termination processing of recording the volume descriptor.

In the first configuration of the recording method of the present invention, it is preferable that the lead-in area and the lead-out area are recorded at the time of the first recording on the medium or the session.

Further, in the first configuration of the recording method of the present invention, it is preferable that the virtual directory is arranged at the head of the recordable area of each fixed length packet. The first configuration of the reproducing system of the write-once recording medium according to the present invention is
A method of reproducing a write-once recording medium composed of a plurality of fixed-length packets, a means for detecting whether the medium is a packet-written medium, and a volume descriptor for a packet-written medium. Means, means for detecting a root directory and a path table from the volume descriptor, means for detecting a final packet in which data is recorded when the volume descriptor is unrecorded, and arrangement in the final packet And a means for detecting a final virtual directory in which directory information before the final packet is recorded, and a reproducing operation is performed using the final virtual directory as file management information.

The second structure of the recording system for the write-once type recording medium according to the present invention is capable of performing additional recording in fixed-length packet units and includes at least the root directory record and the position of the path table. A volume descriptor, a root directory recorded at the position indicated by the root directory record in the volume descriptor, and a path table recorded at the position indicated by the path table position in the volume descriptor are recorded. A recording method of a write-once type recording medium, wherein a true / false identifier for identifying that the information recorded in the root directory and the path table is pseudo information, and a directory of information requesting recording And a virtual directory for recording a directory of information already recorded,
When prohibiting additional recording to the medium or the session thereafter, the true root directory and the true path table of the medium or the session are recorded at a predetermined position based on the contents of the last recorded virtual directory. It is characterized in that the terminal processing is performed.

In the second configuration of the recording method of the present invention, it is preferable that the true root directory and the true path table are arranged in the last packet of the data area in the medium or the session.

In the second configuration of the recording method of the present invention, it is preferable that the virtual directory is arranged at the head of the recordable area of each fixed length packet. The second configuration of the reproduction system of the write-once recording medium according to the present invention is
A reproducing system for a write-once recording medium composed of a plurality of fixed-length packets, a means for detecting whether the medium is a packet-written medium, and a volume directory from the volume descriptor in the case of a packet-written medium. Alternatively, an identification unit that detects information about the path table and identifies whether the information about the root directory or the path table is pseudo information or true information, and the information about the root directory or the path table is pseudo information. Means for detecting the positions of the true root directory and the true path table, and means for detecting the recorded final packet when the true path table and the true path table are unrecorded, It is placed in the last packet and records the directory information before the last packet. And means for detecting the final virtual directory, and performing a reproducing operation of the final virtual directory as a file management information.

The third structure of the recording system for the write-once type recording medium according to the present invention is capable of performing additional recording in units of packets of fixed size or arbitrary size, and at least the root directory record and the path table. , A root descriptor recorded in the position indicated by the root directory record in the volume descriptor, and a position indicated in the path table position in the volume descriptor. A recording method of a write-once recording medium in which a path table is recorded, and has at least a directory of information requesting recording, a directory of already recorded information, and information indicating the beginning of the next packet. A virtual directory is provided at a predetermined position in each packet to In the case of prohibiting additional writing later, the terminal information is recorded in the root directory and the path table based on the contents of the virtual directory recorded last, so that the terminal information is recorded. To do.

In the third configuration of the recording method of the present invention, a volume descriptor and a root directory and a path table relating to information recorded in a medium or a session are recorded in a reserved area, and the root directory and the path table are recorded. It is preferable to record the packet including the path table as a packet independent of the data.

The third configuration of the write-once recording medium reproducing system according to the present invention is a write-once recording medium reproducing system consisting of a plurality of packets of fixed size or arbitrary size, and the medium is a packet write medium. Means for detecting whether the packet has been written, a means for acquiring a packet in which the root directory and the path table are recorded from the volume descriptor in the case of a packet-written medium, and a case where the packet is not recorded. Means for detecting a first virtual directory in which a directory relating to the information in the first packet is recorded, means for detecting the position of the virtual directory of the next packet from the first virtual directory, and thereafter virtual virtual directories. Means for tracing the position of the directory and detecting the last virtual directory recorded last, And performing a reproduction operation to a final virtual directory as a file management information.

The fourth configuration of the recording system of the write-once type recording medium according to the present invention is capable of performing additional recording in units of packets of fixed size or arbitrary size, and at least record for root directory and path table. , A root descriptor recorded in the position indicated by the root directory record in the volume descriptor, and a position indicated in the path table position in the volume descriptor. A recording method of a write-once recording medium in which a path table is recorded, wherein a true / false identifier for identifying that the information recorded in the root directory and the path table is pseudo information, and a predetermined value of each packet Is located in the directory of the information requested to be recorded and already recorded Information directory and a virtual directory having information indicating the position of the beginning of the next packet, and when additional writing to the medium or session is prohibited, the true root directory of the medium or session and the true directory The terminating process for recording the path table at a predetermined position on the basis of the contents of the virtual directory recorded last is performed.

In the fourth configuration of the recording method of the present invention, the true root directory and the true path table relating to the file information recorded in the medium or the session are recorded in a previously secured area, and the root directory and the path are stored. It is preferable to record the table recording position at a predetermined position. Further, in this case, the positions of the true root directory and the true path table are preferably recorded in the subcodes RW of the PMA area. Further, in this case, the positions of the true root directory and the true path table are preferably recorded in the volume descriptor. Further, in this case, the locations of the true root directory and the true path table are preferably recorded in the basic volume descriptor within the volume descriptor.

A fourth structure of the write-once recording medium reproducing system according to the present invention is a write-once recording medium reproducing system consisting of a plurality of packets of a fixed size or an arbitrary size, and the medium is a packet write medium. And the information about the root directory or the path table is detected from the volume descriptor in the case of a packet-written medium, and the information about the root directory or the path table is pseudo. Identification means for identifying information or true information, means for detecting the position of the true root directory and the true path table when the information related to the root directory or the path table is pseudo information, and the true If the path table and the true path table are unrecorded, in the first packet Means for detecting a first virtual directories Directory about broadcast is recorded, the first
File management means for detecting the position of the virtual directory of the next packet from this virtual directory, and for detecting the final virtual directory recorded last by sequentially tracking the positions of the virtual directories. A feature is that a reproducing operation is performed as information.

[0022]

According to the first configuration of the recording method of the present invention, additional recording can be performed in fixed-length packet units, and a volume including at least a root directory record and a path table position. The descriptor, the root directory recorded at the position indicated by the root directory record in the volume descriptor, and the path table recorded at the position indicated by the path table position in the volume descriptor are recorded. A recording method for a write-once type recording medium, which comprises a virtual directory for recording a directory of information requested to be recorded and a directory of already recorded information at a predetermined position of each fixed-length packet. When prohibiting subsequent addition to the By recording in the root directory and the path table based on the contents of the finally recorded virtual directory, and by performing a termination process for recording the volume descriptor, the conventional CD-ROM reproducing apparatus can perform the conventional CD-ROM reproduction. It is possible to provide a write-once recording medium that can be reproduced by the same procedure as that of the ROM.
Further, with respect to the medium which has not been subjected to the termination processing, by detecting the last virtual directory, it becomes possible to reproduce based on the content.

In the first configuration of the recording method of the present invention, the lead-in area and the lead-out area are recorded at the time of the first recording on the medium or session. Even if the entire recording area is not recorded, the conventional CD-ROM
It can be played on the playback device.

In the first configuration of the recording method of the present invention, according to a preferable example in which the virtual directory is arranged at the head of the recordable area of each fixed length packet, file recording in medium or session unit is performed. Directory management such as update, deletion, etc. can be performed.

Further, according to the first configuration of the reproducing system of the present invention, the reproducing system of the write-once type recording medium composed of a plurality of fixed length packets, and whether the medium is packet-written or not is determined. Means for detecting, means for detecting a volume descriptor in the case of a packet-written medium, means for detecting a root directory and a path table from the volume descriptor, and if the volume descriptor is unrecorded Means for detecting the last packet in which the data is recorded, arranged in said last packet,
Means for detecting a final virtual directory in which directory information before the final packet is recorded, and performing a reproducing operation by using the final virtual directory as file management information, even if the medium is not terminated.
It is possible to read the contents of the final virtual directory, obtain the file information recorded on the medium, and perform the reproducing operation.

According to the second configuration of the recording method of the present invention, additional recording can be performed in fixed-length packet units, and a volume descriptor including at least a root directory record and a path table position. And a root directory recorded at the position indicated by the root directory record in the volume descriptor and a path table recorded at the position indicated by the path table position in the volume descriptor. A recording method of a type recording medium, wherein a true / false identifier for identifying that the information recorded in the root directory and the path table is pseudo information, a directory of information requested to be recorded, and already recorded With a virtual directory that records a directory of In the case of prohibiting additional writing later, a termination process is performed in which the true root directory and the true path table of the medium or the session are recorded at a predetermined position based on the contents of the last recorded virtual directory. As a result, the following effects can be achieved. That is, first, since the information recorded in the root directory and the path table is provided with a true / false identifier for identifying that it is pseudo information, the volume identifier is recorded when the first recording is performed. be able to. Further, since the true root directory and the true path table are obtained by the termination processing, a medium which can be easily reproduced by most conventional CD-ROM reproducing devices is realized. Further, by providing the virtual directory, it is possible to easily reproduce even a medium which has not been subjected to termination processing.

Further, in the second configuration of the recording method of the present invention, according to a preferable example, the true root directory and the true path table are arranged in the last packet of the data area in the medium or the session. The true root directory and true path table can be easily detected.

Further, according to the second structure of the reproducing system of the present invention, the reproducing system of the write-once recording medium consisting of a plurality of fixed-length packets is used to determine whether the medium is packet-written. A means for detecting and detecting information about the root directory or the path table from the volume descriptor in the case of a packet-written medium,
Identification means for identifying whether the information related to the root directory or the path table is pseudo information or true information, and the true root directory and the true information when the information related to the root directory or the path table is pseudo information. Means for detecting the position of the path table,
Means for detecting the recorded final packet when the true path table and the true path table are unrecorded, and a final directory where the directory information before the final packet is recorded, which is arranged in the final packet. By providing a means for detecting a virtual directory and performing a reproduction operation using the final virtual directory as file management information, it becomes possible to easily reproduce the information without changing the hardware.

According to the third configuration of the recording method of the present invention, additional recording can be performed in packet units of fixed size or arbitrary size, and at least the root directory record and the position of the path table are recorded. A volume descriptor including the following, a root directory recorded at the position indicated by the root directory record in the volume descriptor, and a path table recorded at the position indicated by the path table position in the volume descriptor. Is a recording system of a write-once recording medium in which is recorded, and a virtual directory having at least a directory of information requesting recording, a directory of already recorded information, and information indicating the beginning of the next packet is created. Addition to the medium or session afterwards to prepare for the predetermined position of each packet In the case of prohibiting, the packet length can be changed by performing the termination process of recording the directory information of the medium or the session in the root directory and the path table based on the contents of the virtual directory recorded last. Even if there is, it is possible to know the position of the next packet, and it is possible to provide a disk capable of file management relating to the information recorded in the medium or session.

Also, in the third configuration of the recording method of the present invention, the volume descriptor and the root directory and the path table relating to the information recorded in the medium or the session are recorded in a previously secured area, and the root directory and the path are recorded. According to a preferred example of recording the packet including the table as a packet independent of the data, by recording the independent packet when the termination processing is performed, the medium which has been terminated is recorded in a normal C format.
It becomes possible to reproduce by the D-ROM device.

Further, according to the third structure of the reproducing system of the present invention, the reproducing system of the write-once type recording medium consisting of a plurality of packets of a fixed size or an arbitrary size, wherein the medium is packet-written. And a means for acquiring a packet in which a root directory and a path table are recorded from a volume descriptor in the case of a packet-written medium, and a first means when the packet is not recorded. Means for detecting a first virtual directory in which a directory relating to information in the th packet is recorded, and means for detecting the position of the virtual directory of the next packet from the first virtual directory,
A medium recorded in variable packet length units by sequentially tracing the positions of the virtual directories thereafter and detecting the last recorded final virtual directory, and performing a reproduction operation using the final virtual directory as file management information. Even, it becomes possible to reproduce.

Further, according to the fourth structure of the recording method of the present invention, additional recording can be performed in packet units of fixed size or arbitrary size, and at least the root directory record and the position of the path table are recorded. A volume descriptor including the following, a root directory recorded at the position indicated by the root directory record in the volume descriptor, and a path table recorded at the position indicated by the path table position in the volume descriptor. Is a recording method of a write-once recording medium in which is recorded, a true / false identifier for identifying that the information recorded in the root directory and the path table is pseudo information, and a predetermined position of each packet. A directory of information that is placed and at least requires recording, and a directory of information that has already been recorded. Folder and a virtual directory having information indicating the position of the beginning of the next packet, and in the case of prohibiting additional recording to the medium or the session, the true root directory and the true path of the medium or the session. By performing the termination process of recording the table at a predetermined position based on the contents of the last recorded virtual directory, it is possible to easily reproduce even a medium that is not terminated. Become.

In the fourth configuration of the recording method of the present invention, the true root directory and the true path table relating to the file information recorded on the medium or the session are recorded in a reserved area, and the root directory and According to the preferable example of recording the position where the path table is recorded at a predetermined position, it is possible to manage the record information in the additional recording of the variable length packet. Further, in this case, according to a preferable example in which the positions of the true root directory and the true path table are recorded in the subcodes RW of the PMA area, the positions of the subcodes RW of the PMA area are searched, By recognizing whether the termination processing has been performed, it is possible to easily identify whether the storage area can be additionally written. Further, in this case, according to a preferable example in which the positions of the true root directory and the true path table are recorded in the volume descriptor, the position of the volume descriptor is searched to recognize whether the termination process is performed. Then, it is possible to easily identify whether or not the storage area can be additionally written.

According to the fourth structure of the reproducing system of the present invention, the reproducing system of the write-once type recording medium consisting of a plurality of packets of fixed size or arbitrary size, in which the medium is packet-written. And the information about the root directory or path table from the volume descriptor in the case of a packet-written medium, and whether the information about the root directory or path table is pseudo information or true. Information for identifying the true root directory and the true path table when the information related to the root directory or the path table is pseudo information, the true path table, and Relates to the information in the first packet if the true path table is unrecorded Means for detecting the first virtual directory in which the directory is recorded, means for detecting the position of the virtual directory of the next packet from the first virtual directory, and thereafter the position of the virtual directory is sequentially traced and finally recorded. Means for detecting the final virtual directory that is present, and performing the reproduction operation using the final virtual directory as file management information, so that the final virtual directory can be easily reproduced.

[0035]

The present invention will be described in more detail with reference to the following examples. <First Embodiment> FIG. 1 is a schematic diagram showing the data format of a write-once CD-R of fixed length packet in the first embodiment of the present invention. As shown in FIG. 1, this write-once type C
In D-R, the lead-in area 2 and the
A pregap or the like 6, a first fixed-length packet 9,
The second fixed-length packet, the third fixed-length packet, ..., The (n + 1) th fixed-length packet 1a,
1b, ..., 1n and the lead-out area 3 are arranged. In this write-once type CD-R, write-once is performed in units of each fixed length packet. The fixed-length packet is composed of a plurality of blocks, which are recording units of the CD-R, and each block in the fixed-length packet is naturally physically continuous. In the first fixed-length packet 9, the volume descriptor 10
, A root directory 4, and a path table 5 for facilitating a file search. In the second fixed-length packet 1a, the first fixed packet 1a
Virtual directory 7a and the first recorded data group 8
a and are arranged. Third fixed-length packet 1b
Inside the second virtual directory 7 in order from the inner circumference side.
b and the second recording data group 8b are arranged. In the (n + 1) th fixed length packet 1n, the nth virtual directory 7n and the nth virtual directory are sequentially arranged from the inner circumference side.
The 8th recording data group 8n is arranged. The lead-in area 2 and the lead-out area 3 are defined by the standard called "Red Book", which is the most basic of the CD-related standards. The pre-gap 6 and the like are defined in "Yellow Book" and "Red Book", which are CD-ROM standards. In the volume descriptor 10, various information regarding the recorded medium is recorded. The volume descriptor 10, the root directory 4 and the path table 5 are
CD-ROM logical standard "ISO9660 /
JIS X0606 ". The volume descriptor 10 shown here is defined as a “volume descriptor set” in the standard. Next, the additional recording procedure in the recording method of this embodiment will be described with reference to FIG. FIG.
(A) shows the recording state of the medium when the first recording is performed. At the time of the first recording, first, the pregap 6 is recorded on the medium, and one fixed length packet is opened, and the first virtual directory 7a and the first recorded data are stored in the second fixed length packet 1a. Group 8a is recorded. The gap between the pregap 6 and the second fixed-length packet 1a is "ISO96
In "60 / JIS X0606", since the position of the volume descriptor 10 is determined to be the head of the data area, it is necessary to record the first fixed-length packet 9 including the volume descriptor 10 at the end. is there. Also,
The directory structure of the first recording data group 8a is recorded in the first virtual directory 7a. FIG. 2 (b)
Shows the recording state of the medium when the second recording is performed. At the time of the second recording, the second virtual directory 7b and the second recording data group 8b are newly recorded in the third fixed-length packet 1b. At this time,
The directory structure of the first and second recording data groups 8a and 8b is recorded in the second virtual directory 7b.
Similarly, the directory structure of the recording data group that has been recorded and the recording data group that is about to be recorded is recorded in each virtual directory, and additional recording is performed in fixed-length packet units (FIG. 2C). ). When there is no need to add any more when performing additional writing, or when it is desired to end this session, as shown in FIG. 2 (d), the (n + 1) th fixed length packet 1n The nth virtual directory 7n and the nth recording data group 8n are recorded, and the root directory 4, path table 5 and volume are stored in the first fixed length packet 9 based on the contents of the nth virtual directory 7n. Record descriptor 10. Then, the lead-in area 2 and the lead-out area 3 are recorded and the process ends. If additional recording is performed on the medium by the above recording method, the directory structure of the information recorded up to that point can be acquired by reading the contents of the virtual directory even if there is no root directory or path table. Therefore, it is possible to obtain the target data.

In the present embodiment, the case where the lead-in area 2 and the lead-out area 3 are recorded last has been described as an example, but in an actual CD-ROM reproducing apparatus, first, the lead-in area " Most read information called "TOC". Therefore, in the lead-in area, T
If the OC does not exist, it may be determined that the medium is a blank disc, or that the session does not exist and the reproduction operation may not be performed. In the TOC, time information regarding the tracks of the medium such as the start position of the lead-in area, the data area position (the position of each track if there are a plurality of tracks), and the position of the lead-out area are recorded. Therefore, the area to be recorded is
It is secured in advance over the entire medium or larger than the information to be recorded. As shown in FIG. 4, at the time of the first recording (FIG. 4A), the lead-in area (TO
By recording C) 2 and the lead-out area 3, it is possible to reproduce even a packet-written medium without modifying the hardware of the CD-ROM reproducing device.

Next, the reproducing system of the medium recorded by the recording system of this embodiment will be described with reference to FIG. As shown in FIG. 3, first, it is detected whether the medium set in the device is a packet-written medium (2
0). If the medium is not packet written, normal playback operation is performed (24). If the medium is packet-written, the packet in which the volume descriptor will be recorded is detected (22). If the volume descriptor is recorded in this packet, the volume descriptor is reproduced, the contents of the root directory and the path table are read, and the reproduction operation is performed (25). If the volume descriptor is not recorded in this packet, the last packet in which data is recorded is detected (23). Then, the virtual directory of the last packet in which the data is recorded is read, the directory structure of the data recorded in the medium or the session is acquired, and the reproducing operation is performed (26). That is, the reproduction operation is performed using the final virtual directory as the file management information. By performing the reproducing operation in the above procedure, the conventional CD
-It is possible to reproduce both a ROM and a packet-written medium.

By the way, "ISO9660 / JIS X0606" which is a general format of a CD-ROM is used.
Then, the volume descriptor is mandatory. Then, most CD-ROM players detect the volume descriptor first, and then detect the directory structure recorded in the medium or session based on the path table and the root directory to access the file. Is common. Therefore, in this embodiment, since the volume descriptor is not recorded, there is a possibility that the medium or the session during the additional recording before the termination processing cannot be reproduced by the conventional CD-ROM reproducing device. Therefore, the following configuration is adopted in the second embodiment described below.

<Second Embodiment> FIG. 5 is a schematic diagram showing the data format of a write-once CD-R of fixed length packet in the second embodiment of the present invention. As shown in FIG.
In the write-once CD-R, the lead-in area 2, the pregap 6, etc., the first fixed-length packet, the second fixed-length packet, ... Th fixed-length packet 11a, 11b, ..., 11n,
The lead-out area 3 is arranged. In the first fixed-length packet 11a, in order from the inner circumference side, the volume descriptor 10, the first virtual directory 7a, and the dummy root directory 4 in which pseudo data is recorded.
3, a dummy path table 44 in which pseudo data is recorded and a first recording data group 8a are arranged. In the second fixed-length packet 11b, the second virtual directory 7b and the second virtual directory 7b are sequentially arranged from the inner circumference side.
The second recording data group 8a is arranged. In the nth fixed-length packet 11n, in order from the inner circumference side, the nth virtual directory 7n, the true root directory 41, the true path table 42, and the nth recording data group 8n. Are arranged.

Next, the additional recording procedure in the recording method of this embodiment will be described with reference to FIG. FIG. 6A shows a recording state of the medium when the first recording is performed.
At the time of the first recording, first, the pregap 6 is recorded on the medium, and subsequently, the volume descriptor 10, the first virtual directory 7a, the dummy root directory 43, and the dummy are recorded in the first fixed-length packet 11a. The path table 44 and the first record data group 8a are recorded. At this time, the directory structure of the first recording data group 8a is recorded in the virtual directory 7a. Further, in the dummy root directory 43 and the dummy path table 44, a signal such as a series of hexadecimal "FF" that can be discriminated as meaningless data is recorded. At the time of this first recording, the lead-in area 2 and the lead-out area 3 are also recorded at the same time. FIG. 6B shows the recording state of the medium when the second recording is performed. At the time of the second recording, the second virtual directory 7b and the second recording data group 8b are newly recorded in the second fixed-length packet 11b. At this time, the directory configurations of the first and second recording data groups 8a and 8b are recorded in the second virtual directory 7b. Similarly, the directory structure of the recording data group that has been recorded so far and the recording data group that is about to be recorded is recorded in each virtual directory, and additional recording is performed in fixed-length packet units (FIG. 6).
(C)). When additional recording is not performed, or when it is desired to end this session, as shown in FIG. 6D, the n-th fixed-length packet 11n contains the n-th fixed-length packet. The virtual directory 7n, the true root directory 41, the true path table 42, and the nth recording data group 8n are recorded, and the process ends. If additional recording is performed on the medium by the above recording method, the information of the root directory and the path table of the recorded data will be recorded. Then, it is possible to provide a medium that can be easily reproduced without modifying the conventional CD-ROM reproducing device.

In the present embodiment, a signal is recorded in the dummy root directory 43 and the dummy path table 44 so that it can be discriminated as meaningless data. There is no problem using the identifier.

In this embodiment, the case where meaningless data is recorded in the dummy root directory 43 and the dummy path table 44 has been described as an example, but the present invention is not necessarily limited to this configuration, and the volume is not limited to this. Even if a true / false identifier is recorded in the descriptor 10, the same effect can be obtained. For example, as shown in FIG. 16, in the basic volume descriptor in the volume descriptor, the hexadecimal number "FFFFFFF" is set as the size 30 of the path table.
It is possible to identify that the path table is not ordinary by giving 32-bit data such as a sequence of F ″. According to this method, the dummy path table 44 does not need special data. In the description 31 regarding the position of the path table in the volume descriptor, it is possible to record the position of the true path table 42 in which an area is secured in advance.

As in the present embodiment, the packet for recording the true root directory 41 and the true path table 42 is set as the last packet of the data area in the medium or the session, so that the termination processing is performed. If it is a different medium, it is possible to obtain a root directory and a path table which are the same as those of a normal CD-ROM.

Next, the reproducing method of the medium recorded by the recording method of this embodiment will be described with reference to FIG. As shown in FIG. 7, first, it is detected whether the medium set in the device is a packet-written medium (2
0). If the medium is not packet written, normal playback operation is performed (24). If the medium is packet-written, the information of the volume descriptor is acquired (45). Then, it is identified whether the root directory or path table given in the volume descriptor is pseudo information (46). If the root directory or path table given by the volume descriptor is not pseudo information, the reproducing operation is performed based on the information of the root directory and path table (48). When the root directory or path table given by the volume descriptor is pseudo information, the data of the n-th fixed-length packet 11n where the true root directory 41 and the true path table 42 will be recorded is read. (47). If data is recorded in the n-th fixed length packet 11n, the reproducing operation is performed based on the true root directory 43 and the true path table 44 (49). If no data is recorded in the n-th fixed length packet 11n, the last packet in which data is recorded is detected (23). Then, the virtual directory of the last packet in which the data is recorded is read, the directory structure of the data recorded in the medium or the session is acquired, and the reproducing operation is performed (26). That is,
Playback operation is performed using the final virtual directory as file management information. By performing the reproducing operation according to the above procedure, it is possible to reproduce a conventional CD-ROM or a packet-written medium.

In this embodiment, in order to detect the directory of recorded information, the last recorded packet is detected. actually,
Since the additional recording is performed in fixed length packet units, no virtual directory exists in the unrecorded packet. But I didn't say which data in the packet was a virtual directory. Only the first and last blocks of the packet are clearly marked in the packet, but since the size of the virtual directory is not fixed, the clear position can be specified only at the beginning of the packet. Become.
However, only the first fixed-length packet 11a is an exception. Since the volume descriptor 10 has to be provided at the head of the first fixed-length packet 11a, it is the position following the volume descriptor 10 here.

In the first and second embodiments, it was assumed that the medium is recorded in fixed length packet units. However, in the case of a medium recorded in fixed-length packet units, if the size of the data to be recorded is unspecified, there will be many wasted portions and efficient use will not be possible. Therefore, in the third embodiment described below, a recording method that allows logical additional recording without using fixed-length packets is provided.

<Third Embodiment> FIG. 8 is a schematic diagram showing a data format of a write-once CD-R of a variable length packet in a third embodiment of the present invention. As shown in FIG.
In the write-once CD-R, the lead-in area 2, the pregap 6, etc., the first variable-length packet, the second variable-length packet, ... Th variable-length packet 50a, 50b, ..., 50n,
The lead-out area 3 is arranged. In the first variable-length packet 50a, in order from the inner circumference side, the volume descriptor 10, the first virtual directory 51a,
The first recording data group 8a is arranged. Second
In the second variable-length packet 50b, a second virtual directory 51b and a second recording data group 8a are arranged in order from the inner circumference side. In the nth variable length packet 50n, the nth virtual directory 51n, the root directory 4, the path table 5, and the nth recording data group 8n are arranged in order from the inner circumference side. There is.

Next, an additional recording procedure in the recording method of this embodiment will be described with reference to FIG. FIG. 9A shows the recording state of the medium when the first recording is performed.
At the time of the first recording, first, the pregap 6 is recorded on the medium, and subsequently, the volume descriptor 10, the first virtual directory 51a, and the first recording data are recorded in the first variable-length packet 50a. Group 8a is recorded. At this time, the directory structure of the first recording data group 8a and the start address 52a of the second variable-length packet 50b are recorded in the virtual directory 51a. FIG. 9B shows the recording state of the medium when the second recording is performed. At the time of the second recording,
The second virtual directory 51b and the second recording data group 8b are newly recorded in the second variable-length packet 50b. At this time, the directory configuration of the first and second recording data groups 8a and 8b and the start address 52b of the next third variable length packet (not shown) are recorded in the second virtual directory 51b. Similarly, in each virtual directory, the directory structure of the recording data group that has been recorded up to that point and the recording data group that is about to be recorded and the start address of the variable length packet to be recorded next are recorded. Additional writing is performed in units (FIG. 9C). When additional recording is not performed, or when it is desired to end this session, as shown in FIG. 9D, the n-th variable-length packet 50n contains the n-th variable-length packet 50n. Virtual directory 51n,
The root directory 4, the path table 5, and the nth recording data group 8n are recorded, the lead-in area 2 and the lead-out area 3 are recorded, and the process is ended. If additional recording is performed on the medium by the above recording method, the root directory and the path table can be recorded.

Here, it is desirable that the root directory 4 and the path table 5 are located at predetermined positions. Also,
If the volume descriptor 10 is recorded when the first variable length packet 50a is recorded, it cannot be changed later. Therefore, as shown in FIG. 10, an area for recording the volume descriptor 10, the root directory 4, and the path table 5 is reserved in advance, and this area is set as an independent packet 53. Then, by recording the independent packet 53 when the termination processing is performed, it becomes possible to reproduce the terminated medium with a normal CD-ROM device. 54a, 5 in FIG.
4b and 54n are the first variable-length packets,
The second variable length packet and the nth variable length packet.

In this embodiment, the case where the lead-in area 2 and the lead-out area 4 are recorded when the termination processing is performed has been described as an example, but the present invention is not necessarily limited to this configuration. If a recording area is secured in advance and the lead-in area 2 and the lead-out area 4 are recorded at the time of the first recording, the TOC data is recorded, so that many CD- The file structure can be read by the ROM reproducing device.

Next, the reproducing system of the medium recorded by the recording system of this embodiment will be described with reference to FIG. As shown in FIG. 11, first, it is detected whether the medium set in the device is a packet-written medium (20). If the medium is not packet written, normal playback operation is performed (24). If the medium is a packet-written medium, the packet in which the route directory and the path table will be recorded is detected (21). Next, it is determined whether or not data is recorded in the area where the root directory and the path table will be recorded (22). If the data is recorded in the area where the root directory and the path table are to be recorded, the reproducing operation is performed based on the data of the root directory and the path table (25). If no data is recorded in the area where the root directory and the path table are to be recorded, the position of the second packet is detected from the first virtual directory, and the second virtual directory is detected based on this information. Is read (55). Further, the position of the third packet is detected from the second virtual directory. This operation is repeated until an unrecorded packet is detected (56), and the last recorded virtual directory is detected (23). Then, the final virtual directory is read, the directory structure of the data recorded in the medium or the session is acquired, and the reproducing operation is performed (26). That is, the reproduction operation is performed using the final virtual directory as the file management information. By performing the reproducing operation according to the above procedure, it is possible to reproduce a conventional CD-ROM or a packet-written medium.

In this embodiment, when the termination processing is not performed, it is necessary to determine the configurations of the root directory and the path table in advance and record the volume descriptor first. Therefore, the file structure becomes inflexible. Therefore, the fourth embodiment below proposes a recording method capable of constructing a more flexible file structure.

<Fourth Embodiment> FIG. 12 is a schematic diagram showing a data format of a write-once CD-R of a variable length packet in a fourth embodiment of the present invention. As shown in FIG. 12, in this write-once type CD-R, PCs are sequentially arranged from the inner peripheral side.
A (Power Calibration Area)
55 and PMA (Program Memory Ar)
ea) 56, the lead-in area 2, the pregap, etc. 6
, The first variable-length packet, the second variable-length packet, ..., The n-th variable-length packet 50a, 50
, 50n and the lead-out area 3 are arranged. In the first variable-length packet 50a, in order from the inner circumference side, the volume descriptor 10, the first virtual directory 51a, the dummy root directory 43 in which pseudo data is recorded, and the pseudo variable The dummy path table 44 in which various data are recorded and the first recording data group 8a are arranged. In the second variable-length packet 50b, a start address 52a, a second virtual directory 51b, and a second recording data group 8a are arranged in order from the inner circumference side. In the n-th variable-length packet 50n, the n-th variable-length packet 50n
Virtual directory 51n, the true root directory 41 of the medium or the session, which is recorded when prohibiting additional recording to the medium or the session, and the same when it is prohibited to additionally record to the medium or the session. The true path table 42 of the medium or the session to be recorded and the nth recording data group 8n are arranged.

Next, the additional recording procedure in the recording method in this embodiment will be described with reference to FIG. FIG. 13A shows a recording state of the medium when the first recording is performed. At the time of the first recording, first, the pregap 6 is recorded on the medium, and subsequently, the volume descriptor 10, the first virtual directory 51a, and the dummy root directory 4 are included in the first variable-length packet 50a.
3, the dummy path table 44 and the first recording data group 8a are recorded. At this time, the directory structure of the first recording data group 8a and the start address 52a of the second variable-length packet 50b are recorded in the first virtual directory 51a. Further, in the dummy root directory 43 and the dummy path table 44, a signal such as a series of hexadecimal "FF" that can be discriminated as meaningless data is recorded. further,
At the time of this first recording, the lead-in area 2 and the lead-out area 3 are also recorded. As a result, it becomes possible to perform reproduction when the first recording is finished. FIG. 13B shows a recording state of the medium when the second recording is performed. At the time of the second recording, the second
The second virtual directory 51b and the second data group 8b are newly recorded in the th variable-length packet 50b. At this time, the directory structure of the first and second recording data groups 8a and 8b and the start address 52b of the third variable-length packet (not shown) are recorded in the second virtual directory 51b. . Similarly, in each virtual directory, the directory structure of the record data group that has been recorded up to that point and the record data group that is about to be recorded and the start address of the variable length packet that is the next recordable area are recorded. Additional recording is performed in units of variable length packets (FIG. 13C). When no additional data is added when performing additional recording, or when it is desired to end this session, as shown in FIG.
The n-th virtual directory 51n, the true root directory 41, the true path table 42, and the n-th recording data group 8n are recorded in the th variable-length packet 50n, and the process is ended. If additional recording is performed on the medium with the above recording method,
Information on the root directory of the recorded data and the path table will be recorded.

In the present embodiment, the true root directory 41 and the true path table 42 are the same as the nth recording data group 8n and the nth variable length packet 50n.
The case where the true root directory 41 and the true path table 42 are recorded in independent variable length packets is not a limitation. Absent.

In the present embodiment, the case where the volume descriptor 10, the dummy root directory 43 and the dummy path table 44 are recorded in the same first packet 50a as the first recording data group 8a is an example. However, the present invention is not limited to this configuration, and the volume descriptor 10, the dummy root directory 43, and the dummy path table 44 may be recorded in independent variable-length packets without any problem.

In the present embodiment, the case where meaningless data is recorded in the dummy root directory 43 and the dummy path table 44 has been described as an example, but the present invention is not limited to this configuration, and the volume is not limited to this. Even if a true / false identifier is recorded in the descriptor 10, the same effect can be obtained. For example, as shown in FIG. 16, in the basic volume descriptor in the volume descriptor, the hexadecimal number "FFFFFFF" is set as the size 30 of the path table.
It is possible to identify that the path table is not ordinary by giving 32-bit data such as a sequence of F ″. According to this method, the dummy path table 44 does not need special data. In the description 31 regarding the position of the path table in the volume descriptor, it is possible to record the position of the true path table 42 in which an area is secured in advance.

Here, it is desirable that the true root directory 41 and the true path table 42 are located at predetermined positions. Therefore, an area for recording the true root directory 41 and the true path table 42 is secured in advance,
By recording this position at a predetermined position, this information can be easily acquired. Considering most of the configurations, the variable-length packet including the true root directory 41 and the true path table 42 will be arranged at the end of the recording area, but there is no problem if it is secured at the beginning. .

There are several possible positions for recording the positions of the true root directory 41 and the true path table 42. First, the PMA is considered as a position for recording the positions of the true root directory 41 and the true path table 42. The PMA is an area in which the time information of the area to be recorded is temporarily recorded, and is arranged further inside the lead-in area 2 as shown in FIG. The information is recorded using the subcode Q. Therefore, subcodes R to W that can be reproduced without affecting the data are used. This area is open to the user, and 12 bytes of data can be recorded per block.

However, many pieces of hardware do not support PMA reproduction. Therefore, the volume descriptor 10 can be considered as a position for recording the positions of the true root directory 41 and the true path table 42. FIG. 15 is a schematic configuration diagram of a volume descriptor. The volume descriptor 10 is composed of a basic volume descriptor 61, a secondary volume descriptor 62, a volume partition descriptor 63, an activation record 64, and a volume descriptor set terminator 65. Of these, the basic volume descriptor 61 and the volume descriptor set terminator 65 are indispensable elements, but the other elements are optional and generally not used so much. Therefore, the positions of the true root directory 41 and the true path table 42 can be recorded by using this generally unused portion.

The positions of the true root directory 41 and the true path table 42 can also be recorded in the basic volume descriptor 61, which is an essential element. FIG.
FIG. 3 is a schematic configuration diagram of a basic volume descriptor. Of these, an open area for the application system 34 can be used. There are other areas that can be used in the basic volume descriptor 61, but the description thereof is omitted here.

Next, the reproducing method of the medium recorded by the recording method of this embodiment will be described with reference to FIG. As shown in FIG. 14, first, it is detected whether the medium set in the device is a packet-written medium (2
0). If the medium is not packet written, normal playback operation is performed (24). If the medium is packet-written, the information of the volume descriptor is acquired (45). Next, it is identified whether the root directory and path table given in the volume descriptor are pseudo information (46). If the root directory and the path table given by the volume descriptor are not pseudo information, the file information recorded on the medium is acquired based on the information of the root directory and the path table, and the reproducing operation is performed (25). If the root directory and path table given in the volume descriptor is pseudo information, it detects the location where the true root directory and true path table are recorded, and whether data is recorded at that location. Is confirmed (71). If the data is recorded, the file information recorded in the medium is acquired based on the information of the true root directory and the true path table, and the reproducing operation is performed (72). When the true root directory and the true path table are not recorded, the position of the second variable length packet is detected from the first virtual directory. The second virtual directory is read based on this information (73). further,
The position of the third variable length packet is detected from the second virtual directory. This operation is repeated until an unrecorded variable length packet is detected (74). Then, the last recorded virtual directory is detected, the final virtual directory is read, the file information recorded on the medium is acquired, and the reproducing operation is performed (26). That is,
Playback operation is performed using the final virtual directory as file management information. If the reproducing operation is performed in the above procedure, it is possible to reproduce the conventional CD-ROM or the packet-written medium.

[0063]

As described above, according to the present invention,
The use efficiency of the medium is improved and the conventional CD-RO
A recording system and a reproducing system of a write-once recording medium which can be easily reproduced by the M apparatus are realized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a data format of a write-once CD-R of a fixed length packet in a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an additional recording procedure in the recording system of the first embodiment of the present invention.

FIG. 3 is a flowchart showing a reproduction procedure in the reproduction system of the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing another example of the data format of the write-once CD-R of fixed length packet in the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing a data format of a write-once CD-R of a fixed length packet according to a second embodiment of the present invention.

FIG. 6 is a schematic diagram showing a write-once procedure in the recording system of the second embodiment of the present invention.

FIG. 7 is a flowchart showing a reproduction procedure in the reproduction system of the second embodiment of the present invention.

FIG. 8 is a schematic diagram showing a data format of a write-once CD-R of a variable length packet according to a third embodiment of the present invention.

FIG. 9 is a schematic diagram showing a write-once procedure in the recording system of the third embodiment of the present invention.

FIG. 10 is a schematic diagram showing another example of the data format of the write-once type CD-R of the variable length packet in the third embodiment of the invention.

FIG. 11 is a flowchart showing a reproduction procedure in the reproduction system of the third embodiment of the present invention.

FIG. 12 is a schematic diagram showing a data format of a write-once CD-R of a variable length packet in a fourth embodiment of the present invention.

FIG. 13 is a schematic diagram showing a write-once procedure in the recording system of the fourth embodiment of the present invention.

FIG. 14 is a flowchart showing a reproduction procedure in the reproduction system of the fourth embodiment of the present invention.

FIG. 15 is a configuration diagram of a CD-ROM volume descriptor defined by ISO9660 / JIS X0606.

FIG. 16 is a data configuration diagram of a basic volume descriptor of a CD-ROM specified by ISO9660 / JIS X0606.

FIG. 17 is a schematic diagram showing a data format of a multi-session CD-ROM.

[Explanation of symbols]

 2 Lead-in area 3 Lead-out area 4 Root directory 5 Path table 7 Virtual directory 10 Volume descriptor

Claims (16)

[Claims] 1. A volume descriptor which can be additionally written in fixed-length packet units, and which is shown in a volume descriptor including at least a root directory record and a path table position, and a root directory record in the volume descriptor. A recording method of a write-once type recording medium in which a root directory recorded in a position and a path table recorded in a position indicated in a position of a path table in the volume descriptor are recorded, and a recording is requested. A directory for information and a virtual directory for recording a directory of already recorded information at a predetermined position of each fixed-length packet are provided. When prohibiting additional recording to a medium or session, the medium or session is Directory information based on the contents of the last recorded virtual directory. A recording method for a write-once recording medium, characterized in that the recording is performed in the root directory and the path table, and a termination process for recording the volume descriptor is performed. 2. The recording system of the write-once recording medium according to claim 1, wherein the lead-in area and the lead-out area are recorded at the first recording on the medium or the session. 3. A reproducing system for a write-once recording medium composed of a plurality of fixed-length packets, a means for detecting whether the medium is a packet-written medium, and a volume in the case of the packet-written medium. Means for detecting a descriptor, means for detecting a root directory and a path table from the volume descriptor, means for detecting a final packet in which data is recorded when the volume descriptor is unrecorded, A write-once recording, which is arranged in a final packet and has means for detecting a final virtual directory in which directory information before the final packet is recorded, and which performs a reproducing operation using the final virtual directory as file management information. Media playback method. 4. A volume descriptor which can be additionally written in fixed-length packet units, and which is shown in a root directory record in the volume descriptor and a volume descriptor including at least a root directory record and a path table position. A recording method of a write-once type recording medium in which a root directory recorded in a position and a path table recorded in the position indicated in the position of the path table in the volume descriptor are recorded. A true / false identifier for identifying that the information recorded in the table is pseudo information, and a virtual directory for recording a directory of information requested to be recorded and a directory of information already recorded are provided. , If you want to prohibit additional writing to the medium or session,
A write-once type recording medium characterized by performing a terminating process of recording the true root directory and the true path table of the medium or the session at a predetermined position based on the contents of the finally recorded virtual directory. Recording method. 5. The recording system for a write-once type recording medium according to claim 4, wherein the true root directory and the true path table are arranged in a final packet of a data area in a medium or a session. 6. A reproducing system for a write-once recording medium composed of a plurality of fixed-length packets, a means for detecting whether the medium is a packet-written medium, and a volume when the medium is a packet-written medium. Identification information for detecting information about the root directory or the path table from the descriptor and identifying whether the information about the root directory or the path table is pseudo information or true information, and the information about the root directory or the path table is pseudo. Means for detecting the position of the true root directory and the true path table when the true path table and the true path table are unrecorded, and the recorded last packet is detected. Means arranged in the final packet, and a directory before the final packet. And a means for detecting the final virtual directory in which the record information is recorded, and the reproducing operation is performed by using the final virtual directory as file management information. 7. The write-once type recording medium recording method according to claim 1, wherein the virtual directory is arranged at the head of the recordable area of each fixed length packet. 8. A volume descriptor which can be additionally written in fixed-size or arbitrary-size packet units, and which includes at least a root directory record and a position of a path table, and a root directory in the volume descriptor. A recording method of a write-once recording medium in which a root directory recorded in a position indicated in a record for recording and a path table recorded in a position indicated in a position of a path table in the volume descriptor are recorded. A virtual directory having at least a directory of information requested to be recorded, a directory of already recorded information, and information indicating the beginning of the next packet is provided at a predetermined position of each packet, and thereafter, a virtual directory is added to a medium or a session. When prohibiting additional recording of the media or the session, A recording method for a write-once recording medium, characterized in that terminal information recording is performed on the root directory and the path table based on the contents of the last recorded virtual directory. 9. A volume descriptor and a root directory and a path table relating to information recorded in a medium or a session are recorded in a reserved area, and a packet including the root directory and the path table is recorded as a packet independent of data. The recording system of the write-once recording medium according to claim 8. 10. A reproducing system of a write-once recording medium composed of a plurality of packets of a fixed size or an arbitrary size, and means for detecting whether the medium is packet-written and packet-writing. In the case of a medium, a means for obtaining a packet in which a root directory and a path table are recorded from a volume descriptor, and a first directory in which a directory regarding information in the first packet is recorded when the packet is unrecorded Means for detecting a virtual directory, means for detecting the position of the virtual directory of the next packet from the first virtual directory, and means for successively tracing the positions of the virtual directories and detecting the last recorded virtual directory. And the playback operation is performed using the final virtual directory as file management information. A reproduction system of a write-once recording medium characterized by the following. 11. A volume descriptor that can be additionally written in fixed-size or arbitrary-size packet units, and that includes at least a root directory record and a path table position, and a root directory in the volume descriptor. A recording method of a write-once recording medium in which a root directory recorded in a position indicated in a record for recording and a path table recorded in a position indicated in a position of a path table in the volume descriptor are recorded. A true / false identifier for identifying that the information recorded in the root directory and the path table is pseudo information, and a directory of information which is arranged at a predetermined position of each packet and which requires at least recording and Indicates the directory of recorded information and the position of the beginning of the next packet And a virtual directory containing information that prohibits subsequent addition to the medium or the session, the true root directory and the true path table of the medium or the session are stored in the virtual directory last recorded. A recording method for a write-once recording medium, which is characterized by performing a terminal process of recording at a predetermined position based on the content. 12. A true root directory and a true path table relating to file information recorded on a medium or a session are recorded in a reserved area, and a recording position of the root directory and the path table is recorded at a predetermined position. The recording system of the write-once recording medium according to claim 11. 13. The write-once type recording medium recording method according to claim 12, wherein the positions of the true root directory and the true path table are recorded in the subcodes R to W of the PMA area. 14. The write-once type recording medium recording method according to claim 12, wherein the positions of the true root directory and the true path table are recorded in a volume descriptor. 15. The recording system of the write-once type recording medium according to claim 14, wherein the positions of the true root directory and the true path table are recorded in the basic volume descriptor in the volume descriptor. 16. A reproducing system of a write-once recording medium consisting of a plurality of packets of a fixed size or an arbitrary size, and means for detecting whether the medium is packet-written and packet-writing. In the case of a medium, information for detecting the root directory or the path table from the volume descriptor is detected, and an identifying means for identifying whether the information regarding the root directory or the path table is pseudo information or true information, and the root directory or the path. Means for detecting the positions of the true root directory and the true path table when the information about the table is pseudo information; and the first path when the true path table and the true path table are unrecorded. First virtual directory with a directory of information about the packets A means for detecting a packet, a means for detecting the position of the virtual directory of the next packet from the first virtual directory, and a means for subsequently tracing the positions of the virtual directories and detecting the last recorded virtual directory at the end. And a reproducing operation of the write-once recording medium, wherein the reproducing operation is performed by using the final virtual directory as file management information.