JP2001110168A - Information recording and reproducing device, information recording and reproducing method, and recording medium readable by computer in which information recording and reproducing program is recorded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the other processing from being waited by closing session processing when a session consisting of one or plural tracks is recorded in a recording medium in which information can be written one time or information can be rewritten in the same region. SOLUTION: When a session on a CD-RW disk 1 is closed, a drive controller 10 records only track information indicating a track start position and a finish position in the session in a prescribed region without recording a start region indicating start of the session and a finish region indicating finish of the session, and processing closing the session is finished temporarily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording and reproducing apparatus such as an optical disk drive for recording and reproducing information on and from an optical disk, an information recording and reproducing method for recording and reproducing information on a recording medium such as an optical disk, and an optical disk and the like. The present invention relates to a computer-readable recording medium recording an information recording / reproducing program for recording and reproducing information on and from a recording medium.

[0002]

2. Description of the Related Art As a recording medium on which information (data) can be recorded, for example, a compact disk (Comp
act Disc: CD is a CD-R (C), which is a disc on which data can be recorded only once in the same area.
compact Disc Recordable (CD) disc and a CD-RW (Compact Disc R) which is a disc capable of overwriting data in the same area.
rewritable) discs.

[0003] The minimum unit that can be reproduced on the CD-R disc and the CD-RW disc is a unit called a block, and one block has 2048 to 2352 bytes (byte).
e) data is included.

[0004] Further, a minimum unit to be recorded includes a unit called a packet. The packet is composed of one or more reproducible user data blocks and one link block (Link Block) arranged before the user data blocks.
k and four run-in blocks (Run-in Bloc)
k) and two run-in blocks (Run) arranged after the user data block.
-Out Block). The number of user data blocks in this packet is called a packet length.

[0005] Such a CD-R disc, CD-RW
Means for recording data on a disc include a recording method called a track-at-once method and a packet write method.

[0006] The track-at-once method has a maximum of 99
This is a method in which a track, which is a recording unit capable of recording up to a single piece, is recorded at a time in one packet. The information such as the start address and end address of the track is stored in a separate area on the disk medium in the program memory area (Program).
ram Memory Area (PMA) and track information (Table Of Contents: TOC)
Record as

[0007] 150 blocks before one track,
Or a pre-gap consisting of 225 blocks (PreG
ap), and in the user data field in the pre-gap, information on the attribute of the track such as the packet length of the fixed length packet in the track is recorded.

[0008] On the other hand, the packet write method is a method in which the track is divided into a plurality of packets and recorded for each packet. Further, there are two recording methods, a fixed-length packet writing method and a variable-length packet writing method.
A method in which there are types and the packet length is fixed in the track is called a fixed length packet write method, and a method in which the packet length of each packet varies in the track is called a variable length packet write method.

The above-mentioned CD-R disc and CD-R
In a W disk, recording is performed in a unit called a session including a plurality of tracks in an area called a lead-in (Lead-in) / lead-out (Lead-out). TOC information exists in the lead-in area, and information such as a start address and an end address of a track included in the session is recorded.

[0010] A session in which the lead-in area / lead-out area exists is called a closed session, and recording the lead-in area / lead-out area is called closing the session. When this session is closed, TOC information is recorded in the lead-in area.

Conventionally, an information recording / reproducing apparatus (for example, see Japanese Patent Application Laid-Open No. Hei 7-21743) that changes the configuration of TOC information so that additional writing is possible even when the TOC information is written, or a TOC information in a lead-in area. Before recording information, there is an information recording / reproducing apparatus that temporarily records TOC information in another area for the purpose of protecting the TOC information (for example, see JP-A-6-60615).

[0012]

However, in the conventional information recording / reproducing apparatus, the lead-in area and the lead-out area must be recorded at the time of closing the session. Since 30 seconds are required, for example, even if recording is performed at 2 × speed, a processing time of about 45 seconds is required, and during that time, there is a problem that other processing is waited.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and one or a plurality of recording media on which information can be written only once or information can be overwritten in the same area. An object of the present invention is to prevent another process from being waited for by a process of closing a session when a session including a track is recorded.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a recording medium on which information can be written only once or information can be overwritten on the same area.
In an information recording / reproducing apparatus for recording and reproducing a session including one or a plurality of tracks, when a session on the recording medium is closed, a start area indicating a start of the session and an end area indicating an end are not recorded. A session closing process temporary ending means for recording only track information indicating a start position and an end position of a track in the session in a predetermined area on the recording medium and temporarily ending the session closing process is provided.

In the information recording / reproducing apparatus as described above, it is preferable that the session closing processing temporary ending means includes means for recording a plurality of the track information in the predetermined area.

In the information recording / reproducing apparatus as described above, when information is not recorded or reproduced on the recording medium, the session closing process is temporarily terminated by the session closing process temporary ending means. It is preferable to provide session closing processing means for recording a start area indicating the start of the session and an end area indicating the end including the track information recorded in the predetermined area and ending the processing for closing the session.

An information recording / reproducing method for recording and reproducing a session comprising one or a plurality of tracks on a recording medium on which information can be written only once or information can be overwritten on the same area. When the session on the recording medium is closed, only the track information indicating the start position and the end position of the track in the session is recorded on the recording medium without recording the start area indicating the beginning and the end area indicating the end of the session. Provided is an information recording / reproducing method for recording in a predetermined area above and temporarily terminating a process of closing a session.

In the above information recording / reproducing method, a plurality of the track information may be recorded in the predetermined area.

Further, in the information recording / reproducing method as described above, when information is not recorded or reproduced on the recording medium, the track recorded in the predetermined area for the session in which the closing process is temporarily terminated. It is preferable to record a start area indicating the start of the session and an end area indicating the end including the information, and end the process of closing the session.

Furthermore, a function of recording and reproducing a session composed of one or a plurality of tracks on a recording medium on which information can be written only once or information can be overwritten on the same area; When closing a session on the recording medium, only the track information indicating the start position and the end position of the track in the session is recorded on the recording medium without recording the start area indicating the beginning of the session and the end area indicating the end. A function of temporarily ending the process of closing the session by recording in a predetermined area, a function of recording a plurality of the track information in the predetermined area, and when information is not recorded or reproduced on the recording medium,
A function of recording a start area indicating the beginning of the session and an end area indicating the end of the session including the track information recorded in the predetermined area with respect to the session for which the closing processing has been temporarily ended, and terminating the processing of closing the session. A computer-readable recording medium on which an information recording / reproducing program to be realized by a computer is recorded is also provided.

According to the information recording / reproducing apparatus of the present invention and the information recording / reproducing method of the present invention, when a session is closed, areas (lead-in area and lead-out area) respectively indicating the start and end of the session are set. Without recording
Since only the track information (TOC information) indicating the start position and the end position of the track in the session is recorded and the session closing process is temporarily terminated, the time required for the session closing process can be greatly reduced, Other processes can be executed without waiting for a long time.

In the information recording / reproducing apparatus according to the second aspect of the present invention and the information recording / reproducing method according to the fifth aspect, since a plurality of the track information are recorded in the predetermined area, any one of the track information may be damaged. Also, it is possible to reproduce information on a recording medium based on other track information.

According to a third aspect of the present invention, there is provided the information recording / reproducing apparatus according to the third aspect of the present invention, wherein the closing process is temporarily terminated when no information is recorded or reproduced on the recording medium. Since the start area indicating the beginning of the session and the end area indicating the end of the session are recorded, including the track information recorded in the predetermined area, and the processing for closing the session is ended. Playback can also be performed with a recording / playback device.

According to a seventh aspect of the present invention, there is provided a computer-readable recording medium on which the information recording / reproducing program is recorded. By installing the information recording / reproducing program on the computer, the functions corresponding to the above-mentioned respective means are realized on the computer. Therefore, the versatility can be improved.

[0025]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a CD-RW drive according to one embodiment of the present invention.

This CD-RW drive comprises a motor 2 for rotating a CD-RW disc 1 as a recording medium on which information can be overwritten in the same area at an arbitrary rotation speed, and a rotation control for controlling the motor 2. A part 3 is provided.

The laser light L is applied to the CD-RW disc 1.
Pickup 4 for irradiating light, and the optical pickup 4
A laser drive circuit 5 for driving the irradiation of the laser light L, etc.
Actuator control unit 6 for controlling movement of optical pickup 4 in the radial direction of CD-RW disc 1
And a signal control unit 7 for controlling a signal from the optical pickup 4.

Further, each of the above components, the host computer 1
1. Control of the entire CD-RW drive such as an external interface 8 for transmitting and receiving signals such as commands and data to and from the host computer 11 and a buffer 9 serving as a temporary storage for data and the like sent from the host computer 11. And a drive controller 10 for executing various processes according to the present invention. The drive controller 10 is realized by a microcomputer including a CPU, a ROM, a RAM, and the like.

The CD-RW drive has a CD
-Data recording, reproduction, and erasure are performed on the RW disc 1.

That is, the CD-RW drive records and reproduces a session comprising one or more tracks on a recording medium on which information can be written only once or information can be overwritten on the same area. Is equivalent to an information recording / reproducing apparatus that performs the following.

The drive controller 10
However, when closing a session on the recording medium, only the track information indicating the start position and the end position of the track in the session is recorded without recording the start area indicating the beginning of the session and the end area indicating the end. Means for temporarily closing a session by recording in a predetermined area on a medium and temporarily closing the session; means for recording a plurality of track information in the predetermined area; and recording or reproduction of information on the recording medium. When the session is not performed, the start area indicating the beginning and the end area indicating the end of the session including the track information recorded in the predetermined area are set for the session temporarily closed by the session closing processing temporary end unit. It functions as a session closing processing means for recording and ending the process of closing the session.

FIG. 2 is an explanatory diagram showing the format of the recording area of the CD-RW disc 1 shown in FIG. CD
-The recording area of the RW disc 1 is a power calibration area (Power Calibrate) from the inner peripheral side.
ion Area: PCA 20, Program Memory Area: PM
A) 21, Lead-in area (Lead-in Are)
a) 22 and a program area 23.

The PCA 20 is an area for calibrating the recording power. The PCA 20 has 100 test areas and 100 count areas, respectively. When the CD-RW drive records data on the CD-RW disc 1 for the first time, the laser power calibration (OPC) ) To set an appropriate recording power for the CD-RW disc 1 based on the result of the OPC.

The PMA 21 has a track start address,
An area for recording track information such as an end address.
The lead-in area 22 is an area indicating the beginning of the session 25, and is an area for recording track information (TOC information) in the session 25.

The program area 23 is an area for recording user data. In this program area 23,
User data such as various files and music are stored in the track 24.
The information such as the start address, end address, and data mode of each track 24 is recorded in the PMA 21 and the lead-in area 22 with contents called TOC information. In the TOC information, information of the track 24 included in the session 25 is recorded.

The track 24 is a unit area for recording user data such as files and music. Session 25
One recording unit includes a lead-in area 22, one or more tracks, and a lead-out area 26. The lead-out area 26 is an area indicating the end of the session 25.

Next, the format when data is recorded on the track 24 by the track-at-once method will be described. FIG. 3 is a diagram showing a format when data is recorded on the track 24 by the track-at-once method.

In the case of the track-at-once method, the track 24 is composed of one packet and has a pre-gap (Pre
The pre-gap 30 further includes a link (Link) block 33, a run-in (Run-in) block 34, and the like.

The pre-gap 30 is composed of 150 blocks or 225 blocks, is located at the head of the track 24, and records information relating to the attribute of the track 24 in an internal user data field.

The link block 33 is a block composed of one block, which means a joint between tracks. The run-in block 34 includes four blocks,
This is the block that means the beginning of the track.

The user data block 31 is a block for recording user data. Run-out block 32
Is a block consisting of two blocks, which means the end of the track.

When the track-at-once method is used, the user data block 31 has at least three data blocks.
It is stipulated that there must be at least 00 blocks.

Next, a format when data is recorded on the track 24 by the packet write method will be described. FIG. 4 is a diagram showing a format when data is recorded on the track 24 by the packet write method.

In the case of the packet write system, the track 24
Is composed of a pre-gap 40 and a user data section 41, and the user data section 41 is composed of a plurality of packets 42.

The packet 42 has a link block (L
Ink Block) 50 and run-in block (Ru)
n-in Blocks) 51, a user data block 52, and a run-out block (Run-out Bl).
ocks) 53.

The packet 42 is a lump of sectors existing in the track 24, and the minimum unit is one sector. In the packet write method, the packet 42 is recorded at one time. The link block 50 is a block composed of one block, which means a joint between packets.

The run-in block 51 is a block consisting of four blocks, which means the head of a packet. The user data block 52 is a block for recording user data. The run-out block 53 is a block consisting of two blocks, which means the end of the packet.

The CD-RW drive transmits the packet 42
Is recorded by one write process. In addition, the packet write method has an advantage that the user data block 52 can be recorded from a minimum of one block in the packet write method as compared with the track-at-once method, and the use of a file system makes it possible to handle the hard disk and the floppy disk. What you can do is listed.

As described above, the packet write system has two types of recording systems: fixed-length packets and variable-length packets.

Next, a process for closing a session in the CD-RW drive will be described. FIG. 5 shows the CD
It is a flowchart which shows the session closing process temporary end process which concerns on Claim 1 of this invention in -RW drive.

When the drive controller 10 receives the command for closing the session from the host computer 11, it starts the session closing temporary termination process, and generates TOC information equivalent data in step (indicated by "S" in FIG. 1). It is determined whether or not the data has been generated. If the data has not been generated, the process proceeds to step 2, where the data corresponding to the TOC information is generated, and the process proceeds to step 3.

After the data corresponding to the TOC information is generated in step 3, or if the data corresponding to the TOC information is already generated in the determination in step 1, the data corresponding to the TOC information is recorded in a predetermined area in step 3, and this processing is performed. finish.

Further, the above processing will be described. When closing the session 25 of the CD-RW disc 1, the drive controller 10 records a lead-in area (start area indicating the start of the session) 22 and a lead-out area (end area indicating the end of the session) 26 of the session 25. Instead, only the TOC information equivalent data (track information) indicating the start address (start position) and end address (end position) of the track 24 in the session 25 is recorded on the CD-R.
The process of recording in the predetermined area of the W disk 1 and closing the session is temporarily terminated.

In this way, it is possible to reduce the time required for closing the session at the time of data recording.
Other processing from the host computer can be executed quickly.

Next, in the above-mentioned session closing processing temporary end processing, data corresponding to the TOC information is recorded in only one place, but when the data corresponding to the TOC information is damaged, the CD-RW disc 1 is recorded. The recorded data cannot be reproduced. So TO
It is preferable to record data corresponding to C information at a plurality of locations so that data corresponding to TOC information is not lost.

FIG. 6 is a flowchart showing the session closing temporary termination processing according to the second aspect of the present invention in a CD-RW drive.

When the drive controller 10 receives the command for closing the session from the host computer 11, it starts the session closing process temporary termination process, and generates TOC information equivalent data in step (indicated by "S" in the figure) 11. It is determined whether or not the data has been generated. If the data has not been generated, the process proceeds to step 12, where the data corresponding to the TOC information is generated, and the process proceeds to step 13.

After the data corresponding to the TOC information is generated in step 13, or if the data corresponding to the TOC information is already generated in the determination in step 11, the data corresponding to the TOC information is recorded in a predetermined area in step 13, and the process proceeds to step 14. To determine whether or not data equivalent to the preliminary TOC information has been recorded,
If it is not recorded, the process proceeds to step 13 where a spare T having the same content as the TOC information equivalent data is stored in another part of the predetermined area.
The data corresponding to the OC information is recorded, and if the data corresponding to the preliminary TOC information has been recorded in the judgment of step 14, this processing is ended.

Further, the above processing will be described. When closing the session 25 of the CD-RW disc 1, the drive controller 10 does not record the lead-in area 22 and the lead-out area 26 of the session 25, and stores the TOC indicating the start address and the end address of the track 24 in the session 25. Only information-equivalent data is recorded at a predetermined location in a predetermined area of the CD-RW disc 1.

Further, the spare TOC information equivalent data is recorded as spare data of the TOC information equivalent data at a plurality of other locations in the predetermined area of the CD-RW disc 1, and the process of closing the session is temporarily terminated.

As described above, when the process of closing the session is temporarily terminated, the data corresponding to the TOC information is recorded at a plurality of locations, so that even if any of the data is damaged, the data corresponding to the other TOC information is used. Thus, data on the CD-RW disc can be reproduced.

Next, a description will be given of a predetermined area in which TOC information is recorded by the above-described session close processing temporary end processing. FIG. 7 is an explanatory diagram showing a format of the track 24 when the TOC information is recorded in a predetermined area by the above-mentioned session closing processing temporary end processing.

For example, in the user data block 31,
One TOC information equivalent data recording unit 60 for recording TOC information equivalent data (TOC information) indicating the start address and end address of a track in a session,
A spare TOC information equivalent data recording unit 6 for recording respective spare TOC information equivalent data having the same contents as the information equivalent data
1 is provided at three places.

Next, in the CD-RW drive according to this embodiment, a CD-R having only the session closing
When reproducing the W disk 1, the user data can be reproduced based on the track information in the predetermined area. However, a general CD-ROM drive uses the CD-RW disk which has been subjected to the session close processing temporary end processing. Playback cannot be performed.

This is because a general CD-ROM drive reproduces data on a disc based on the TOC information recorded in the lead-in area on the CD-RW disc 1.

Therefore, in order to enable the existing CD-ROM drive to reproduce the CD-RW disc 1 as described above, a lead-in area / lead-out area is recorded after the above-mentioned session close processing temporary end processing, T in it
It is necessary to record OC information.

FIG. 8 is a flowchart showing a session closing process according to the third aspect of the present invention in the CD-RW drive.

The drive controller 10 determines in step (indicated by "S" in the figure) 21 whether or not there has been no access from the host computer for a predetermined time, and if not, proceeds to step 22 and temporarily terminates the above-described session closing processing. The TOC information equivalent data (or spare TOC information equivalent data) recorded in the process is reproduced, and the process proceeds to step 23 where the lead-in area, the lead-out area, and the TOC information equivalent data (or the spare TOC information equivalent) for the corresponding session. ) Is recorded, and this process ends.

Further, the above processing will be described. When an access is made within a predetermined time from the last access from the host computer 11, the drive controller 10 reads the lead-in area / lead-out area / TO
The recording process of the C information is not executed, and the access from the host computer 11 is executed until there is no access to the CD-RW drive.

Then, the drive controller 10 determines that no access has been made for a predetermined time since the last access from the host computer 11, that is, the CD-R
When recording or reproduction has not been performed on the W disc 1 for a predetermined period of time, the TOC information-equivalent data recording unit 60 has been recorded on the CD-RW disc 1 by the above-described session close processing temporary end processing. The data corresponding to the TOC information is reproduced.

As described above, the T recorded in the lead-in area
The OC information can be detected by reproducing the TOC information equivalent data already recorded in the TOC information equivalent data recording unit 60.

The TOC and the lead-in area 22 and the lead-out area 26 of the session 25
Information equivalent data is recorded as TOC information.

If the data corresponding to the TOC information in the TOC information equivalent data recording unit 60 cannot be reproduced, the spare T
The data corresponding to the spare TOC information is reproduced from the OC information equivalent data recording unit 61, and the spare TOC information equivalent data is
It is recorded as C information together with the lead-in area 22 and the lead-out area 26 of the corresponding session 25.

As described above, after the above-described session close processing temporary end processing, when not being used by the host computer, the lead-in area / lead-out area and the TOC information are recorded in the corresponding session, and the session close processing is performed. Since the process is completed, the format is set to a format that can be reproduced by a general CD-ROM drive.
This CD-RW disc can also be reproduced in the M drive.

In the above embodiment, the recording medium is C
Although the description has been given of the case of the drive using the D-RW disc, MO, CD-R, DVD-R, DVD-RAM
The same can be applied to a drive that performs recording and reproduction on other recordable recording media.

Next, a floppy disk, not shown,
A recording medium (for example, a CD-R disk) in which information can be written only once on a recording medium such as a CD-ROM disk, an MO disk, and a DVD disk, or a recording medium (for example, a recording medium in which information can be overwritten in the same area) A function of recording and reproducing a session composed of one or more tracks on a CD-RW disc, a start area (lead-in area) indicating the beginning of the session when the session on the recording medium is closed, Without recording the end area (lead-out area) indicating the end, only the track information (data corresponding to TOC information) indicating the start position (start address) and the end position (end address) of the track in the session is recorded on the recording medium. A function of temporarily terminating a process of recording in a predetermined area (TOC information equivalent data recording unit) and closing a session; A function of recording a plurality of track information in the predetermined area (a data recording section corresponding to the TOC information and a data recording section corresponding to the spare TOC information); and a step of temporarily closing the data when no data is recorded or reproduced on the recording medium. The predetermined area (TO
A function of recording a start area indicating the beginning and an end area indicating the end of the session including the track information recorded in the data recording unit corresponding to the C information or the data recording unit corresponding to the preliminary TOC information, and ending the process of closing the session. Is recorded in a CD-RW drive via the recording medium, and the drive controller 10 executes the information recording / reproducing program to realize the above processing. You can also.

[0077]

As described above, according to the information recording / reproducing apparatus, the information recording / reproducing method, and the computer-readable recording medium on which the information recording / reproducing program is recorded, information can be written only once. When a session including one or more tracks is recorded on a recording medium on which information can be overwritten in the same area, other processes can be prevented from being waited for by closing the session.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a CD-RW drive according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a format of a recording area of the CD-RW disc 1 shown in FIG.

FIG. 3 is a diagram showing a format when data is recorded on the track shown in FIG. 2 by a track-at-once method.

FIG. 4 is a diagram showing a format when data is recorded on the track shown in FIG. 2 by a packet write method.

FIG. 5 is a flowchart showing a session closing process temporary end process according to claim 1 of the present invention in the CD-RW drive shown in FIG. 1;

FIG. 6 is a flowchart showing a session closing process temporary end process according to claim 2 of the present invention in the CD-RW drive shown in FIG. 1;

FIG. 7 is an explanatory diagram showing the format of a track when TOC information is recorded in a predetermined area by the session closing process temporary end process shown in FIGS. 5 and 6.

FIG. 8 is a flowchart showing a session closing process according to claim 3 of the present invention in the CD-RW drive shown in FIG.

[Explanation of symbols]

 1: CD-RW disc 2: Motor 3: Rotation control unit 4: Optical pickup 5: Laser drive circuit 6: Actuator control unit 7: Signal control unit 8: External interface 9: Buffer 10: Drive controller 11: Host computer 20 : PCA 21: PMA 22: Lead-in area 23: Program area 24: Track 25: Session 26: Lead-out area 30, 40: Pre-gap 31, 52: User data block 32, 53: Run-out block 33, 50: Link block 34, 51: run-in block 41: user data section 42: packet 60: TOC information equivalent data recording section 61: spare TOC information equivalent data recording section

Claims (7)

[Claims] 1. A recording medium in which information can be written only once or information can be overwritten in the same area.
In an information recording / reproducing apparatus that performs recording and reproduction of a session including one or a plurality of tracks, when a session on the recording medium is closed, a start area indicating a start of the session and an end area indicating an end are not recorded. A session closing process temporary ending means for recording only track information indicating a start position and an end position of a track in the session in a predetermined area on the recording medium and temporarily terminating a session closing process is provided. Information recording and playback device. 2. The information recording / reproducing apparatus according to claim 1, wherein the session closing processing temporary ending means includes means for recording a plurality of the track information in the predetermined area. . 3. The information recording / reproducing apparatus according to claim 1, wherein when information is not recorded or reproduced on the recording medium, the session closing process is temporarily terminated by the session closing process temporary terminating unit. On the other hand, session closing processing means for recording a start area indicating the beginning of the session and an end area indicating the end including the track information recorded in the predetermined area and ending the processing for closing the session is provided. Information recording and playback device. 4. A recording medium on which information can be written only once or information can be overwritten on the same area.
In an information recording / reproducing method for recording and reproducing a session including one or a plurality of tracks, when a session on the recording medium is closed, a start area indicating a start of the session and an end area indicating an end are not recorded. An information recording / reproducing method, characterized by recording only track information indicating a start position and an end position of a track in the session in a predetermined area on the recording medium and temporarily terminating a process of closing the session. 5. The information recording / reproducing method according to claim 4, wherein a plurality of said track information are recorded in said predetermined area. 6. The information recording / reproducing method according to claim 4, wherein when information is not recorded or reproduced on the recording medium, the closing process is recorded in the predetermined area for a session temporarily ended. An information recording / reproducing method characterized by recording a start area indicating the beginning of a session and an end area indicating the end including the track information thus recorded and ending the process of closing the session. 7. A recording medium on which information can be written only once or information can be overwritten on the same area,
A function for recording and reproducing a session consisting of one or a plurality of tracks; and, when closing a session on the recording medium, the start area indicating the beginning and the end area indicating the end of the session are not recorded. A function of recording only track information indicating a start position and an end position of a track in a predetermined area on the recording medium to temporarily end processing for closing a session, and a function of recording a plurality of the track information in the predetermined area. When information is not recorded or reproduced on the recording medium, the session in which the closing process is temporarily terminated includes a start area indicating the beginning of the session and an end including the track information recorded in the predetermined area. Information recording / reproducing program for realizing the function of recording the indicated end area and terminating the process of closing the session. Computer readable recording medium recording a gram.