JP2005085354A - Information recording / reproducing apparatus, information recording / reproducing method, and information recording / reproducing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To normally perform information recording or reproducing operation even in the case of an information recording medium in which TOC (Table Of Contents) is not recorded normally due to a fault etc. during recording. <P>SOLUTION: First to fourth steps are carried out. At the first step, the session number of a closed last session is obtained from the TOC area of an optical disk. At the second step, information is obtained from the SDCB (Session Disk Control Block) of the session of the obtained session number and it is checked whether the information is recorded in the CTRL area of this session. At the third step, the process of the second step is carried out for the session of the next session number when the recorded information is found in the CTRL area of the session at the second step. At the fourth step, this session is decided to be a not closed session when the recorded information is not found in the CTRL area of the session at the third step. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information recording / reproducing apparatus, an information recording / reproducing method, and an information recording / reproducing program for recording / reproducing data on / from an information recording medium such as DVD + R (Digital Versatile Disk + Recordable). About.

  DVD + R is a standard of DVD (Digital Versatile Disk) advocated by the DVD + RW (Digital Versatile Disk + Rewriteable) Alliance. The DVD + RW Alliance is a voluntary organization of leading companies in the personal computer, optical recording device, and consumer electronics industries.

  With DVD + R, it is possible to record up to 191 sessions in the recording area of the information recording medium (disc). A maximum of 16 tracks (called “fragments” in DVD + R) can be recorded in each session. DVD + R employs a multi-session recording method in order to additionally write data to a disc whose session is closed (see Patent Document 1).

  The multi-session recording method is a recording format in which additional recording is performed multiple times. The data recording unit is composed of a “lead-in” that is a mark for starting recording, a data body, and a “lead-out” that is a mark for ending recording. It has a structure in which a number of "sessions" are connected. In DVD + R, the lead-in after the second session is called “intro”, and the lead-out before the last session is called “closure”.

Logical information indicating the recording state of the DVD + R is recorded in a toc (TOC; table of contents), a session disc control block (SDCB; session disc control block) in each session, or a control data area of the inner periphery of the disc. . The TOC records the status of all closed sessions.
JP2003-208779A (page 3-4)

  In DVD + R, information on a closed session is obtained from the TOC, and information on a session that is not closed is obtained from SDCB. However, if the TOC cannot be recorded normally due to a failure during recording on the disc, the closed session cannot be determined from the TOC, so data cannot be acquired from the session, and normal information reproduction is performed. I can't. Also, when it is impossible to determine whether the session is closed or not, it is not possible to know from which position the recording should be started, so that normal information recording cannot be performed.

  Therefore, in the present invention, an information recording / reproducing apparatus and an information recording / reproducing apparatus capable of normally performing information recording or reproducing operation even on an information recording medium in which the TOC is not normally recorded due to a failure during recording or the like. It is an object to provide a method and an information recording / reproducing program.

  In order to solve the above problem, the present invention acquires a session number of the last session closed from the TOC area of the information recording medium, acquires information from the SDCB area of the session of the acquired session number, and A second step for confirming whether or not information is recorded in the control area of the session; and if information is recorded in the control area of the session in the second step, the second step is performed for the session of the next session number. The third step to be executed and the fourth step for determining that this session is an unclosed session when no information is recorded in the control area of the session in the third step. It is.

  According to the present invention, it is possible to normally perform information recording or reproducing operation even on an information recording medium in which the TOC is not normally recorded due to a failure during recording.

  1st invention of this application records the information including the TOC area | region which records the information containing the session number and recording position about a closed session, and the fragment number and recording position about the fragment which the recording in each session was complete | finished A session number and a recording position from the TOC area for a closed session from an information recording medium having an SDCB area for recording and a control area for recording information including a recording position of data in each session for the closed session Sessions that have not been played back or closed by reading the data in each session by obtaining information including the fragment number and recording position in the session from the SDCB area. An information recording / reproducing apparatus for recording data, the first step of acquiring the session number of the last session closed from the TOC area of the information recording medium, and acquiring information from the SDCB area of the session of the acquired session number A second step of confirming whether or not information is recorded in the control area of the session; and if information is recorded in the control area of the session in the second step, Control means for executing a third step for executing the step and a fourth step for determining that the session is an unclosed session when no information is recorded in the session control area in the second step. Information recording / reproducing apparatus Acquires the session number of the last session closed from the TOC area of the recording medium, acquires information from the SDCB area of the session with the acquired session number, and confirms whether information is recorded in the control area of this session If information is recorded in the control area of the session, information is sequentially obtained from the SDCB area of the session with the next session number, and it is confirmed whether information is recorded in the control area of this session. If no information is normally acquired from the TOC area by searching for a session in which no information is recorded in the session control area and determining that the session is not closed, no information is recorded in the TOC area. Even if the claw The information including the session number and the recording position can be acquired from the TOC area for the selected session, and the information including the fragment number and the recording position in the session can be acquired from the SDCB area for the non-closed session. As a result, even in an information recording medium in which the TOC is not normally recorded due to a failure during recording or the like, the data in each session can be read and recorded in a session that is not reproduced or closed. It is possible to perform information recording or reproducing operation.

According to a second invention of the present application, in the first invention described above, the control means does not add information to the information recording medium when no information is recorded in the control area of the session acquired from the TOC area in the second step. An information recording / reproducing apparatus for executing the fifth step of determining that the information is possible, confirming whether information is recorded in the control area of the closed last session recorded in the TOC area; If no information is recorded, it is determined that additional writing is impossible. As a result, when information cannot be normally acquired from the TOC area, it is determined that the information recording medium is damaged and no additional recording processing is performed, so that normal recording on the information recording medium is not performed. Can be prevented.

  The third invention of the present application records a TOC area for recording information including a session number and a recording position for a closed session, and information including a fragment number and a recording position for a fragment for which recording has been completed in each session. A session number and a recording position from the TOC area for a closed session from an information recording medium having an SDCB area for recording and a control area for recording information including a recording position of data in each session for the closed session Sessions that have not been played back or closed by reading the data in each session by obtaining information including the fragment number and recording position in the session from the SDCB area. In the information recording / reproducing method for recording data, the first step of acquiring the session number of the last session closed from the TOC area of the information recording medium, the information is acquired from the SDCB area of the session of the acquired session number, and A second step for confirming whether or not information is recorded in the control area of the session; and if information is recorded in the control area of the session in the second step, the second step is performed for the session of the next session number. Information that includes a third step to be executed and a fourth step for determining that the session is not closed when no information is recorded in the control area of the session in the third step. Recording and playback method, Acquires the session number of the last session closed from the TOC area of the medium, acquires information from the SDCB area of the session with the acquired session number, and confirms whether information is recorded in the control area of this session. When information is recorded in the control area of the session, information is sequentially acquired from the SDCB area of the session of the next session number, and further, it is confirmed whether information is recorded in the control area of the session, When information cannot be normally acquired from the TOC area by searching for a session in which no information is recorded in the control area of the session and determined as a session that has not been closed, or when information is not recorded in the TOC area Even closed Information including the session number and recording position can be acquired from the TOC area for the session that has been recorded, and information including the fragment number and recording position within the session can be acquired from the SDCB area for the session that has not been closed. As a result, even in an information recording medium in which the TOC is not normally recorded due to a failure during recording or the like, the data in each session can be read and recorded in a session that is not reproduced or closed. It is possible to perform information recording or reproducing operation.

  In the fourth invention of the present application, in the third invention, when information is not recorded in the control area of the session acquired from the TOC area in the second step, it is impossible to add information to the information recording medium. The information recording / reproducing method includes a fifth step of determining whether the information is recorded in the control area of the last session that is recorded in the TOC area, and the information is If it is not recorded, it is determined that additional writing is impossible. As a result, when information cannot be normally acquired from the TOC area, it is determined that the information recording medium is damaged and no additional recording processing is performed, so that normal recording on the information recording medium is not performed. Can be prevented.

5th invention of this application records the information including the TOC area | region which records the information including the session number and recording position about a closed session, and the fragment number and recording position about the fragment which the recording in each session ended. A session number and a recording position from the TOC area for a closed session, from an information recording medium having an SDCB area for recording and a control area for recording information including the recording position of data in each session for the closed session Sessions that have not been played back or closed by reading the data in each session by obtaining information including the fragment number and recording position in the session from the SDCB area. An information recording / reproducing program for causing a computer to function as an information recording / reproducing apparatus for recording data, wherein the computer acquires a session number of the last session closed from the TOC area of the information recording medium; The second step of acquiring information from the SDCB area of the session of the acquired session number and confirming whether or not the information is recorded in the control area of this session, and the information is recorded in the control area of the session in the second step If no information is recorded in the control area of the session in the third step for executing the second step for the session of the next session number, the session is not closed. If there The information recording / playback program for executing the fourth step of deciding the session number of the last session closed from the TOC area of the information recording medium, and acquiring information from the SDCB area of the session of the acquired session number Acquire and check whether information is recorded in the control area of this session. If information is recorded in the control area of the session, information is sequentially acquired from the SDCB area of the session of the next session number. Further, by checking whether or not information is recorded in the control area of this session, and searching for a session in which no information is recorded in the control area of the session and determining that the session is not closed, the TOC You can get information from the area normally Even if there is no information or no information is recorded in the TOC area, information including the session number and recording position is acquired from the TOC area for a closed session, and a session is acquired from the SDCB area for a non-closed session. The information including the fragment number and the recording position can be acquired. As a result, even in an information recording medium in which the TOC is not normally recorded due to a failure during recording or the like, the data in each session can be read and recorded in a session that is not reproduced or closed. It is possible to perform information recording or reproducing operation.

  According to a sixth invention of the present application, in the fifth invention, when information is not recorded in the control area of the session acquired from the TOC area in the second step in the fifth invention, it is impossible to add information to the information recording medium. This is an information recording / reproducing program for executing the fifth step of determining whether the information is recorded in the control area of the closed last session recorded in the TOC area. If it is not recorded, it is determined that additional writing is impossible. As a result, when information cannot be normally acquired from the TOC area, it is determined that the information recording medium is damaged and no additional recording processing is performed, so that normal recording on the information recording medium is not performed. Can be prevented.

  FIG. 1 is a block diagram showing a schematic configuration of an optical disc apparatus 1 as an information recording / reproducing apparatus in an embodiment of the present invention.

  In FIG. 1, an optical disk apparatus 1 according to an embodiment of the present invention includes a spindle motor 3, an optical pickup 4, a servo circuit 5, a signal processing unit 6, a buffer 7, a CPU (CPU) for rotationally driving an optical disk 2 as an information recording medium. A central processing unit (ROM) 8, a read only memory (ROM) 9, a random access memory (RAM) 10, and an interface (I / F) 11 are provided.

  The optical pickup 4 includes a semiconductor laser as a light source, an objective lens that guides laser light emitted from the semiconductor laser to a recording surface of the optical disc 2 and guides return light reflected by the recording surface to a predetermined light receiving position. System, a light receiver disposed at a light receiving position and receiving return light, and a driving system (not shown) such as a focusing actuator, a tracking actuator, and a seek motor. From the light receiver, a current (current signal) corresponding to the amount of received light is output to the signal processing unit 6.

  The servo circuit 5 generates a control signal for controlling the focusing actuator of the optical pickup 4 based on the focus error signal, and generates a control signal for controlling the tracking actuator of the optical pickup 4 based on the tracking error signal. 4 focusing actuator and tracking actuator are driven. Further, the servo circuit 5 controls the spindle motor 3 based on an instruction from the CPU 8 so that the linear velocity of the optical disk 2 is constant. Further, the servo circuit 5 drives a seek motor for the optical pickup 4 based on an instruction from the CPU 8 to move the optical pickup 4 in the radial direction toward the target track of the optical disc 2.

The I / F 11 is a bidirectional communication interface with a host (for example, a personal computer) serving as an external device. For example, the American National Standards Institute (ANSI)
It conforms to standard interfaces such as ATAPI (AT Attachment Packet Interface) and SCSI (Small Computer System Interface) standardized by the National Standard Institute (National Standard Institute).

  The CPU 8 constitutes a microcomputer (computer) included in the optical disc apparatus 1 together with the ROM 9 and the RAM 10. The ROM 9 that also functions as a storage medium stores a program including an information recording / reproducing program described later written in a code decodable by the CPU 8. The CPU 8 controls the operation of each unit described above according to a program stored in the ROM 9 and temporarily stores data necessary for control in the RAM 10. When the optical disk device 1 is turned on, the program stored in the ROM 9 is loaded (installed) into the main memory (not shown) of the CPU 8.

  The optical disc 2 conforms to the DVD + R standard.

  FIG. 2 is a diagram showing an example of a multi-session format of the optical disc 2 conforming to the DVD + R standard. As described above, in the DVD + R, a maximum of 191 sessions can be recorded in the recording area of the optical disc 2 (in the example of FIG. 2, only the fourth session (Session) is described for simplicity. ). In the head area (lead-in or intro) of each session, an SDCB area and a control data (hereinafter referred to as “CTRL”) area are secured. Further, a TOC area described below is secured in the inner peripheral portion of the optical disc 2.

  In the TOC area, information (hereinafter referred to as “TOC information”) such as a start address and an end address indicating the recording position of user data during each session, and a session number is recorded. The session number starts from 1 from the inner periphery side of the optical disc and is assigned sequentially in ascending order toward the outer periphery side.

The TOC information is recorded one block at a time in each appending format, and the first TOC information block (hereinafter referred to as “TOC block”) is the first session information, and the next TOC block is Subsequent TOC blocks have information on all existing sessions, such as information on the first and second sessions. Therefore, the user data start address and end address of all sessions existing on the optical disc 2 can be acquired by simply reading the last TOC block recorded in the TOC area.

  In the SDCB area, information including a fragment number for a fragment for which recording during each session has been completed, and a fragment start address and a fragment end address indicating the recording position of the fragment are recorded. A fragment is a minimum unit of recording on the optical disc 2. Recording on the optical disc 2 conforming to DVD + R is performed in units of fragments. Recording in the SDCB area is performed when the first fragment of the session is recorded, when reservation (reservation of the fragment recording area) is performed, and when the fragment is closed (recording in the fragment ends), that is, to the session. This is performed when the recording operation is performed or when the start address and end address of the fragment are determined.

  Similarly to the session number, the fragment number starts from 1 from the inner periphery side of the optical disc 2, and is assigned continuously in ascending order even if the session changes, and a value obtained by adding 1 to the previous fragment number is used.

  In the CTRL area, information such as a start address and an end address indicating the recording position of user data during each session (hereinafter referred to as “CTRL information”) is recorded. This CTRL information is recorded when each session is closed. Further, in the CTRL area of the first session, information such as the type of the optical disc 2 (DVD + R, DVD + RW), the diameter of the optical disc 2 (12 cm, 8 cm), the start address and the end address of the user area of the optical disc 2 (User Area), etc. Is recorded.

  Hereinafter, the operation of the optical disc apparatus 1 having the above configuration will be described with reference to the flowchart of FIG. FIG. 3 is a flowchart showing a control procedure of information recording / reproduction processing executed by the CPU 8 of the optical disc apparatus 1.

  As shown in FIG. 3, the CPU 8 first initializes variables (S0). Here, the variable C is a variable for storing the closed session number, the variable P is a variable for storing the recording position of the final TOC block, and the variable Q is a variable for storing the position where the final TOC block is acquired.

  Next, the CPU 8 checks whether or not CTRL information is recorded in the lead-in area (Lead-in Area) of the optical disc 2 (S1), and if it is recorded, acquires the CTRL information from this lead-in area. (S2).

  Further, the CPU 8 confirms whether or not the TOC block is recorded in the TOC area of the optical disc 2 (S3), and if it is recorded, acquires the recording position (P) of the final TOC block and acquires the acquired recording. The position (P) is stored in the variable Q (S4).

Here, when the TOC information can be acquired from the recording position (P) (S5), the CPU 8 derives the closed session number C from the TOC information (S6). On the other hand, when the TOC information cannot be acquired, if the recording position (P) is larger than the recording start position of the TOC block in the TOC area (S7), the TOC block exists on the inner periphery of the optical disc 2, so 16 is subtracted from P (S8), and the process returns to step S5. Here, the reason why 16 is subtracted from P is that one TOC block is composed of 16 sectors (1 sector = 2048 bytes), and in step S5, an attempt is made to acquire TOC information from the previous TOC block. Because. The recording position (from the recording start position of the TOC block in the TOC area)
When P) becomes smaller (S7), the reading of the TOC block is terminated, and the process proceeds to the next step S9.

  Next, the CPU 8 determines whether additional writing to the optical disk 2 is possible (S9). If additional recording is possible, the CPU 8 determines whether there is a closed session (C ≠ 0) (S10). Here, when there is a closed session, the value of the variable C is set to the variable T as the session number from which information is acquired in the next step S13 (S11). On the other hand, if there is no closed session, a value 1 is set as the variable T (S12).

  Next, the CPU 8 acquires the SDCB information of the session number T (S13) and determines whether the SDCB information exists (S14). Here, when SDCB information exists, the CPU 8 determines whether or not the CTRL information of the session number T has been recorded (S15). If the CTRL information of the session number T has been recorded, the CPU 8 adds 1 to the variable T (S16), and further determines whether or not additional recording to the optical disc 2 is possible (S17). If additional writing is possible, the process returns to step S13.

  Note that whether or not additional writing to the optical disc 2 is possible in steps S9 and S17 is determined based on whether or not the following condition is satisfied. (1) When no information indicating that additional writing is not possible after the last session is recorded in the TOC information, (2) When the number of closed sessions is less than the upper limit defined in the standard, (3) Closed If the area from the end address of the session closure to the maximum recordable address of the optical disk 2 is equal to or greater than the minimum area necessary for session recording, it is determined that additional recording to the optical disk 2 is possible.

  On the other hand, if the CTRL information of the session number T is not recorded in step S15, the CPU 8 determines whether the session of the session number T is a session in which the TOC information has been recorded (S18), and the TOC information has been recorded. If it is a session, a disk damage flag is set assuming that the optical disk 2 is damaged (S19).

  Thereafter, the CPU 8 ends the process. Note that the CPU 8 also ends the process when the additional writing is impossible in step S9 or step S17, or when the SDCB information does not exist in step S14.

  As described above, the optical disc apparatus 1 in the present embodiment acquires the session number of the last session closed from the TOC area of the optical disc 2 (S6), and acquires information from the SDCB area of the session with the acquired session number. (S13) Further, it is confirmed whether or not information is recorded in the CTRL area of this session (S15). When information is recorded in the CTRL area of the session, the SDCB area of the session of the next session number is sequentially recorded. Information is obtained from the session, and it is confirmed whether or not information is recorded in the CTRL area of this session. A session in which no information is recorded in the CTRL area of the session is searched (S15), and the session is not closed. Information is normally extracted from the TOC area. Even when information cannot be recorded or information is not recorded in the TOC area, information including the session number and recording position is obtained from the TOC area for a closed session, and from the SDCB area for a session that is not closed. The information including the fragment number and the recording position can be acquired. As a result, even in the optical disc 2 in which the TOC is not normally recorded due to a failure during recording, the data in each session can be read and reproduced or recorded in each session. Alternatively, it is possible to perform a reproduction operation.

Also, in the optical disc apparatus 1 of this embodiment, it is confirmed whether or not information is recorded in the CTRL area of the last session that is recorded in the TOC area (S15) and (S18), and the information is recorded. If not, a disc damage flag is set assuming that the optical disc 2 is damaged (S19), and it is determined that additional writing is impossible. Thereby, it is possible to prevent the normal recording on the optical disc 2 from being performed by not performing any additional recording processing.

  FIG. 4 is an example showing a recording state on the optical disc 2, wherein (a) shows a state in which recording in the TOC area is normal, and (b) and (c) show abnormal recording states in the TOC area. It is a figure which shows the state which is.

  As shown in FIG. 4A, when the recording in the TOC area of the optical disc 2 is normal, the above-described steps S0 → S1 → S2 → S3 → S4 → S5 → S6 (C = 3) → S9 → S10 → Through S11 (T = 3) → S13 → S14 → S15 → S16 (T = 4) → S17 → S13 → S14 → S15 → S18, the first to third sessions are already closed and data recording is completed. Since it is determined that the fourth session is not closed and it is possible to add data based on the SDCB information of the fourth session, the data in each session is normally read and reproduced. Alternatively, data can be recorded in a fragment that can be additionally written after the fourth session.

  As shown in FIG. 4B, when the recording state in the TOC area of the optical disk 2 is abnormal (the third block in the TOC area is abnormal), the above-described steps S0 → S1 → S2 → S3 → S4 → S5 → S7 → S8 → S5 → S6 (C = 2) → S9 → S10 → S11 (T = 2) → S13 → S14 → S15 → S16 (T = 3) → S17 → S13 → S14 → S15 → S16 (T = 4) By passing through S17 → S13 → S14, even if the recording state in the TOC area is abnormal, the first to third sessions are already closed and the data recording is finished. Since the session is not closed and it is determined that data can be additionally written based on the SDCB information of the fourth session, the data in each session is normally read and played back or the fourth session. It is possible that after the down postscript to record the data into fragments as possible.

  Also, as shown in FIG. 4C, the recording state in the TOC area of the optical disc 2 is abnormal (the closed session number is recorded in the TOC information, but the CTRL information of this session is not recorded). Therefore, if there is a mismatch between the TOC information and the session state), the above-described steps S0 → S1 → S2 → S3 → S4 → S5 → S6 (C = 3) → S9 → S10 → S11 (T = 3) By passing through S13 → S14, even if the recording state in the TOC area is abnormal, the first and second sessions are already closed and the data recording is finished, and the third session is closed. However, the data in each session can be read and reproduced normally. Further, it is possible to make additional writing impossible by setting a damage flag.

  The present invention is useful as an information recording / reproducing apparatus, an information recording / reproducing method, and an information recording / reproducing program for recording / reproducing data on / from an information recording medium such as a DVD + R. Is suitable as an information recording / reproducing apparatus, an information recording / reproducing method, and an information recording / reproducing program capable of normally performing information recording or reproducing operation even if the information recording medium is not normally recorded.

1 is a block diagram showing a schematic configuration of an optical disc apparatus as an information recording / reproducing apparatus in an embodiment of the present invention. The figure which shows the multi-session format example of the optical disk based on the DVD + R specification Flow chart showing control procedure of information recording / reproducing process executed by CPU of optical disc apparatus It is an example which shows the recording state to an optical disc, Comprising: (a) is a figure which shows the state which the recording to a TOC area | region is normal, (b) and (c) show the state where the recording state to a TOC area | region is abnormal. Illustration

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 2 Optical disk 3 Spindle motor 4 Optical pick-up 5 Servo circuit 6 Signal processing part 7 Buffer 8 CPU
9 ROM
10 RAM
11 Interface (I / F)

Claims (6)

TOC area for recording information including session number and recording position for closed session, SDCB area for recording information including fragment number and recording position for fragments for which recording in each session has ended, and closed For a closed session, information including a session number and a recording position is acquired from the TOC area for a closed session, and the information is closed. For a session that has not been performed, information including the fragment number and recording position in the session is obtained from the SDCB area, and data in each session is read and recorded in a session that is not played back or closed. An information recording and reproducing apparatus,
A first step of acquiring the session number of the last session closed from the TOC area of the information recording medium, information is acquired from the SDCB area of the session of the acquired session number, and information is recorded in the control area of this session A second step for confirming whether or not the information is recorded in the control area of the session in the second step, and a third step for executing the second step for the session with the next session number; Information characterized by comprising control means for executing a fourth step for determining that this session is an unclosed session when no information is recorded in the session control area in the third step. Recording / playback device. The control means executes a fifth step of determining that additional recording to the information recording medium is impossible when no information is recorded in the control area of the session acquired from the TOC area in the second step. The information recording / reproducing apparatus according to claim 1, wherein: TOC area for recording information including session number and recording position for closed session, SDCB area for recording information including fragment number and recording position for fragments for which recording in each session has ended, and closed For a closed session, information including a session number and a recording position is acquired from the TOC area for a closed session, and the information is closed. For a session that has not been performed, information including the fragment number and recording position in the session is obtained from the SDCB area, and data in each session is read and recorded in a session that is not played back or closed. In the information recording and reproducing how to,
A first step of acquiring the session number of the last session closed from the TOC area of the information recording medium, information is acquired from the SDCB area of the session of the acquired session number, and information is recorded in the control area of this session A second step for confirming whether or not the information is recorded in the control area of the session in the second step, and a third step for executing the second step for the session with the next session number; And a fourth step of determining that the session is an unclosed session when no information is recorded in the session control area in the third step. And a fifth step of determining that appending to the information recording medium is impossible when no information is recorded in the control area of the session acquired from the TOC area in the second step. The information recording / reproducing method according to claim 3. TOC area for recording information including session number and recording position for closed session, SDCB area for recording information including fragment number and recording position for fragments for which recording in each session has ended, and closed For a closed session, information including a session number and a recording position is obtained from the TOC area for a closed session, and the information is closed. For a session that has not been performed, information including the fragment number and recording position in the session is obtained from the SDCB area, and data in each session is read and recorded in a session that is not played back or closed. As the information recording and reproducing apparatus for an information recording and reproducing program for causing a computer to function,
A first step of acquiring the session number of the last session closed from the TOC area of the information recording medium in the computer, acquiring information from the SDCB area of the session of the acquired session number, and further, a control area of this session A second step for confirming whether or not information is recorded in the second session, and when information is recorded in the session control area in the second step, the second step is executed for the session with the next session number. Information for performing the third step and the fourth step for determining that this session is an unclosed session when no information is recorded in the session control area in the third step. Recording / playback program. Causing the computer to execute a fifth step of determining that additional recording on the information recording medium is impossible when information is not recorded in the control area of the session acquired from the TOC area in the second step. 6. An information recording / reproducing program according to claim 5, characterized by the above.

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