JP2006172013A - program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unauthorized writing into a recording medium except a recording medium previously permitted with writing. <P>SOLUTION: This HB disk application program is recorded in a reading-dedicated area 30 of an HB CD-R disk 1 having the reading-dedicated area 30 and a writable area 31, acquires specific information of a final session already written in the writable area 31 of the HB CD-R disk 1 when the HB disk application program is read out, is installed to a PC or an optical disk device and is executed, and performs the writing into the HB CD-R disk 1 only when the acquired specific information satisfies a predetermined condition. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a program to be executed by a processing device such as a personal computer.

Conventionally, there has been a program (for example, see Patent Document 1) that executes data writing if the recording medium (optical disk) conforms to some standard.
By the way, in recent years, hybrid discs (Hybrid Discs: HB discs) having a read-only area and a writable area on a single optical disk (a recording medium such as a CD or a DVD) have been on the market.
As a main method of using the HB disk, a program (application program) or an installer for installing the program in an information processing apparatus such as a personal computer (PC) is written in advance in the read-only area.
After the HB disk is inserted into the optical disk drive (optical disk device), the program is read from the read-only area of the HB disk, and the program is started by the control section of the optical disk drive or the PC control section if installed on the PC by the installer. After executing some processing, the data created by the processing is written in the writable area of the HB disc.
JP-A-8-147703

However, in the conventional program, if a recording medium (optical disc) conforming to the standard is written, data is written, so that special data for determining whether or not the disc is a copy disc is written on a non-regular optical disc. As a result, the contents and structure of special data may be easily analyzed.
The present invention has been made in view of the above points, and an object of the present invention is to prevent unauthorized writing to a recording medium other than a recording medium for which writing is permitted in advance.

In order to achieve the above object, the present invention provides the following programs.
(1) The computer acquires the specific information of the last session already written in the writable area of the recording medium having the read-only area and the writable area, and the acquired specific information satisfies a predetermined condition. A program that executes a procedure for writing to the recording medium only occasionally.
(2) In the program of (1), the specific information is the volume information of the last session.
(3) The program according to (1), wherein the specific information is information on the number of tracks existing in the last session.
(4) The program according to (1), wherein the specific information is information on a track length of a track existing in the last session.

(5) The program according to (1), wherein the specific information is unique information written in a predetermined sector in an area not used in the file system existing in the last session.
(6) The program according to (1), wherein the specific information is information indicating a writing method to a track existing in the last session.
(7) In the program of (1), the specific information indicates information indicating a fixed-length packet method that is a writing method to a track existing in the last session and a fixed packet length of a track existing in the last session. Informational program.
(8) The program according to (1), wherein the specific information is information indicating a characteristic structure of a file system existing in the final session.

(9) The computer acquires the specific information of the last session already written in the writable area of the recording medium having the read-only area and the writable area, and the acquired specific information satisfies a predetermined condition. Only in the program for executing the procedure for writing to the recording medium, the specific information includes the volume information of the last session, the number of tracks existing in the last session, and the track of the track existing in the last session. Length information, unique information written in a predetermined sector in an area not used by the file system existing in the last session, information indicating a fixed-length packet method which is a writing method to a track existing in the last session And fixing the tracks present in the last session Information indicating the packet length, the program is information obtained by combining a plurality any information indicating the characteristic structure of the file system existing on the last session.

  The program according to the present invention executes writing only when a specific condition acquired from the writable area satisfies a preset condition when writing information to a recording medium having a read-only area and a writable area. Unauthorized writing to a recording medium other than the recording medium permitted for writing can be prevented.

Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
In the embodiment of the present invention, a hybrid CD-R disc (HB / CD-R disc) is used as an optical disc that is a recording medium for recording the program according to the present invention, and the HB / CD-R disc is recorded on the disc. The data writing method uses multi-session track at once (Multi Session, Track At Once), and ISO 9660 is used for the file system.

FIG. 1 is a diagram showing a format of an area of a hybrid CD-R disc (HB / CD-R disc) which is an embodiment of a recording medium on which a program according to the present invention is recorded.
The inner peripheral part of the HB / CD-R disk 1 is a read-only area (ROM part) 30, and an application program (HB) for a hybrid disk corresponding to the program according to the present invention is stored in the read-only area 30. Disc application program) is recorded in advance. In addition, a writable area (RAM section) 31 for recording data and the like created by the processing of the HB disk application program is provided on the outer periphery of the disk.

FIG. 2 is a diagram showing the format (disc layout) of the recording area of the HB / CD-R disc 1 shown in FIG.
The read-only area 30 consists of only the first session (1st session), in which an HB disk application program and an installer (installation program) for installing the HB disk application program in the control unit of the PC are recorded in advance. The writable area 31 writes data added to the second session (2nd session). The unwritten area is an area where data will be additionally written.
Hereinafter, the case where the last session (last session) used by the HB disk application program is the second session will be described.

FIG. 3 is a diagram showing the structure of the volume descriptor of the ISO9660 file system in the second session shown in FIG.
“Primary Volume Descriptor (PVD)” is written in the 16th sector (N + 16) from the start address: LBA = N of the second session (final session).
Thereafter, zero or more “Secondary Volume Descriptor (SVD)” is written in the 17th sector (N + 17), and one or more “volume descriptor group” is written in the 18th sector (N + 18). “Volume descriptor set terminal (TD)” is written.
Note that when writing is performed with a general CD-R disc writing software program, writing is often performed with a configuration of one PVD, 0 to 1 SVD, and 1 TD.

The HB disk application program allows data to be written only to an optical disk having the characteristics indicating that it is an HB disk, and does not write to a standard optical disk.
Accordingly, it is possible to prevent data specialized for the HB disc, for example, data written later to determine whether the disc is a copy disc, from being easily written to the standard disc.
The specialized data is data that is used only by the HB disk (the HB disk application program), and means data that is meaningful only for the HB disk (the HB disk application program).

In addition, as an example of data that is acquired later to determine whether or not the disk is a copy disk, for example, when adding data on an HB disk, the disk free space after the data is added is calculated in advance. The data of the free disk capacity is recorded at the time of appending to the HB disk. At that time, it may be written as a file, or may be written in an available area of the file system.
When the HB disk application program records data on the optical disk loaded in the optical disk apparatus, it reads the data of the free capacity from the optical disk and compares it with the actual free capacity of the optical disk. If the free space data cannot be read or the free space indicated by the free space data read from the optical disc does not match the actual free space, it is regarded as not being an HB disc and data is written. Not performed.

Further, when an HB disk application program is installed and used in a personal computer (PC), if the number of times of use is determined for the HB disk application program, writing of the HB disk is performed each time the HB disk application program is used. Add data indicating the remaining number of usable times to the available area.
Since the data indicating the remaining number of usable times is equivalent to special data for determining whether or not the disk is a copy disk, special data can be easily analyzed when writing to a standard disk is possible without any restrictions. This increases the possibility that the mechanism will be revealed to unauthorized users.
Therefore, when the HB disk application program is started, the remaining usable number of times of the optical disk mounted on the optical disk device is read, and when it is 1 or more, the user is permitted to use it. In this way, the mechanism does not have to be disclosed to unauthorized users.

FIG. 4 is a block diagram showing a configuration of an information recording / reproducing system including an optical disc apparatus for executing a program according to the present invention and a PC.
In this information recording / reproducing system, an optical disk device 2 and a PC 3 are connected via an external interface 4 so that data can be exchanged.
The external interface 4 is used for transmitting and receiving commands, data, and the like between the optical disc apparatus 2 and the PC 3.
The optical disc apparatus 2 can write the HB / CD-R disc 1 shown in FIG. 1 and a normal optical disc, such as a CD-R disc, a CD-RW disc, a DVD + RW disc, a DVD-RW disc, a DVD-RAM disc, etc. An information recording / reproducing apparatus such as a CD-R drive, a CD-RW drive, a DVD + RW drive, a DVD-RW drive, and a DVD-RAM drive for reading and writing information on a recording medium of a type.

The spindle motor (motor) 10 is a motor that rotates the HB / CD-R disc 1 at a predetermined rotational speed when data is written (data recording) and when data is read (data reproduction).
The rotation control unit 11 performs rotation control of the motor 10.
The optical pickup 12 is a device for emitting and irradiating laser light L with a predetermined recording power when recording data on the HB • CD-R disc 1 and reproducing data recorded on the HB • CD-R disc 1. It is.
The actuator control unit 13 performs control to move the optical pickup 12 when focusing and tracking the HB / CD-R disc 1.

The signal control unit 14 controls the reproduction signal output from the optical pickup 12 and the recording signal output to the optical pickup 12.
The laser drive circuit 15 drives the emission of the laser light L from the optical pickup 12.
The buffer 16 is a memory used as a temporary storage area for temporarily storing data to be recorded on the HB / CD-R disc 1 or a normal optical disc by the drive controller 17.
The drive controller 17 is realized by a microcomputer including a CPU, a ROM, a RAM, and the like, and controls the entire optical disc device 2.

The PC 3 is a host computer such as a personal computer that controls the optical disc apparatus 2, and includes a display unit 20 such as a CRT or LCD, an input unit 21 such as a keyboard and a mouse, and a control unit 22.
The control unit 22 is realized by a microcomputer including a CPU, a ROM, a RAM, and the like. The control unit 22 performs overall control of the PC 3, controls input from the user from the input unit 21, and displays information to the user on the display unit 20. A graphical user interface (GUI) processing unit 23 for performing control and the like, a main function processing unit 24 for performing original processing by an application program to be executed, and an HB disk application program read from the HB / CD-R disk 1 are installed. Each function unit of the write function processing unit 25 realized by the execution of the HB disk application program is provided.

  When the HB / CD-R disc 1 is loaded in the optical disc apparatus 2, the writing function processing unit 25 sends an installer in the read-only area 30 of the HB / CD-R disc 1 to the control unit 22 of the PC 3. This is implemented when the installer installs the HB disk application program in the read-only area 30 in the control unit 22.

Next, processing of the writing function processing unit 25 of the control unit 22 will be described.
First, the HB disk application program acquires specific information of the last session already written in a writable area of a recording medium having a read-only area and a writable area, and the acquired specific information is determined in advance. A process in the case of a program that executes a procedure for writing to a recording medium only when the above conditions are satisfied will be described.

FIG. 5 is a flowchart showing processing of the writing function processing unit 25 shown in FIG.
When a write command is received from the main function processing unit 24, the write function processing unit 25 specifies the last session of the writable area of the HB / CD-R disc to be written in step 1 (indicated by “S” in the figure). Information is acquired and the condition information predetermined in step 2 is referred to. This condition information is described in advance in the HB disk application program, and is set in the RAM of the control unit when the HB disk application program is activated. Thereafter, it is determined in step 3 whether or not the acquired specific information satisfies the condition information. If it is satisfied, writing to the HB / CD-R disc (additional writing) is executed in step 4 and the process is terminated. . On the other hand, if the condition information is not satisfied in step 3, an error message is displayed on the display unit in step 5, and the process ends without doing anything.

  In this way, since writing is performed after determining the identity of the optical disk loaded in the optical disk device based on the specific information of the final session, it is possible to prevent erroneous writing to other types of optical disks that should not be performed originally. .

Next, it is desirable that the specific information of the last session described in the above processing is information that can be acquired regardless of the use environment of the optical disc. That is, the information needs to be defined by a standard or standard.
Therefore, the specific information may be volume information of the last session.
Next, processing when the specific information is used as volume information of the last session will be described.
For example, assume that the PVD shown in FIG. 3 is used. The configuration of PVD is defined by the ISO 9660 standard.
FIG. 6 is a diagram showing a PVD configuration according to the ISO 9660 standard.
For example, the condition information is that a character string of volume information “ABC0001” of the last session is written in “application system area” assigned to byte positions 884 to 1395.

  When a write command is issued from the main function processing unit 24, the write function processing unit 25 specifies the last session recorded in the application system area of the last session of the writable area of the HB / CD-R disc to be written. Information is acquired and predetermined condition information “ABC0001” is referred to. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “ABC0001” (whether or not they match), and if they satisfy (or matches), writing (additional writing) to the HB / CD-R disc is performed. Execute this to finish this process. On the other hand, if the condition information “ABC0001” is not satisfied (does not match) in the above determination, an error message is displayed on the display unit 20, and this process is terminated without doing anything.

In other words, the PVD of the last session is read before the data is written by the above processing, and is written when the character string “ABC0001” exists in the application system area of the PVD. The character string “ABC0001” is merely an example, and other character strings may be used.
In this way, since the writing position and contents of the volume information are determined in advance by the standard, they can be read regardless of the usage environment of the HB / CD-R disc, and the characteristics of the optical disc based on the volume information. (Whether the data writing is permitted or not) can be determined.

Next, the final session specific information described in the above process may be information on the number of tracks existing in the final session. Processing in that case will be described next.
FIG. 7 is an explanatory diagram of the number of tracks existing in the final session.
As shown in the figure, the condition information is that the final session (track 1 is file system information, tracks 2 to 7 are dummy tracks) is 8 tracks.
When a write command is issued from the main function processing unit 24, the write function processing unit 25 acquires the number of tracks in the last session of the writable area of the HB / CD-R disc that is the write target, and the predetermined condition information “ Refer to “8 tracks”. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “8 tracks” (whether or not they match), and if they satisfy (or matches), writing to the HB / CD-R disc (additional writing) To finish this process. On the other hand, if the condition information “8 tracks” is not satisfied (does not match) in the above determination, an error message is displayed on the display unit 20, and this process is terminated without doing anything.

That is, by the above-described processing, the track number information of the last session is acquired before data writing, and when it is “8 tracks”, data is written. The track number “8” is an example, and other track numbers may be used.
Thus, since the number of tracks existing in the final session can be obtained by a method determined in advance by the standard, it can be read regardless of the usage environment of the HB / CD-R disc, and the optical disc can be read based on the number of tracks. Can be determined.

Next, the final session specific information described in the above-described processing may be information on the track length of a track existing in the final session. Processing in that case will be described next.
FIG. 8 is an explanatory diagram of the track length of the tracks present in the final session.
As shown in the figure, the condition information is that the track length of the last session (a total of 8 tracks including file system information and a dummy data embedding area) is L (sector).
When a write command is issued from the main function processing unit 24, the write function processing unit 25 acquires the track length of the last session in the writable area of the HB / CD-R disc to be written, and sets predetermined condition information “ Refer to “L (sector)”. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “L (sector)” (whether or not they match), and if they satisfy (or matches), writing to the HB / CD-R disc ( This process is terminated by executing (Appendix). On the other hand, if the condition information “L (sector)” is not satisfied (does not match) in the above determination, an error message is displayed on the display unit 20 and this process is terminated without doing anything.

That is, by the above-described processing, the track length of the track of the last session (for example, when there are a plurality of tracks in the last session) is acquired before the data writing, and the track length is L In the case of (sector), data is written.
Thus, since the track length existing in the final session can be obtained by a method determined in advance by the standard, it can be read regardless of the usage environment of the HB / CD-R disc, and light is emitted based on the number of tracks. The identity of the disc can be determined.

Next, the specific information of the last session described in the above process may be unique information written in a predetermined sector in an area not used in the file system existing in the final session. Processing in that case will be described next.
FIG. 9 is an explanatory diagram of an area not used by the file system existing in the final session.
As shown in the figure, the above condition is that a preset character string “ABC0001” is written in an area not used in the file system starting from the start address: LBA = X of the last session of 8 tracks. Information.

  When a write command is received from the main function processing unit 24, the write function processing unit 25 is recorded in an area not used in the file system of the last session of the writable area of the HB / CD-R disc that is the write target. Information is acquired and predetermined condition information “ABC0001” is referred to. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “ABC0001” (whether or not they match), and if they satisfy (or matches), writing (additional writing) to the HB / CD-R disc is performed. Execute this to finish this process. On the other hand, if the condition information “ABC0001” is not satisfied (does not match) in the above determination, an error message is displayed on the display unit 20, and this process is terminated without doing anything.

In other words, by the above processing, before data writing, the data in the sector (start address: LBA = X) next to the last sector in the area managed by the file system of the last session is read and obtained. If the data is the character string “ABC0001”, the data is written.
In this way, arbitrary information can be written in an area not used by the file system, and data can be read out by a general read command. Therefore, HB / CD- It can be read regardless of the usage environment of the R disc, and the identity of the optical disc can be determined based on the data.

Next, the last session specific information described in the above process may be information indicating a writing method to a track existing in the last session. Processing in that case will be described next.
When a write command is issued from the main function processing unit 24, the write function processing unit 25 acquires specific information on the writing method to the last track of the last session of the HB / CD-R disc to be written, and is determined in advance. Refer to the condition information “information indicating the fixed-length packet system”. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “information indicating a fixed-length packet system” (whether or not they match). Is written (additional writing) and this process is terminated. On the other hand, if the condition information is not satisfied (does not match) in the above determination, an error message is displayed on the display unit 20, and this process is terminated without doing anything. In this process, the final track of the final session is checked, but other tracks may be checked.

  In other words, by the above process, before writing data, the writing method of the track of the last session (if there are multiple tracks in the last session, for example, targeting the last track) is acquired and the writing method is fixed. Data is written in the long packet method.

Next, in the above-described processing, when the acquired writing method is a fixed-length packet method, the fixed packet length may be further included in the specific information. Processing in that case will be described next.
FIG. 10 is a flowchart showing another process of the write function processing unit 25 shown in FIG.
When a write command is received from the main function processing unit 24, the write function processing unit 25 writes to the last track of the last session of the HB / CD-R disc to be written in step 11 (indicated by “S” in the figure). The method specific information is acquired, and the condition information “information indicating the fixed-length packet method and packet size = 40h” previously determined in step 12 is referred to.

  This condition information is described in advance in the HB disk application program, and is set in the RAM of the control unit when the HB disk application program is started. Thereafter, in step 13, the packet size (fixed packet length) of the last track of the last session of the HB / CD-R disc is acquired, and in step 14, it is determined whether or not the packet size = 40h (fixed packet length condition information). Whether or not the specified information satisfies the above condition information) is determined, and if satisfied, writing (additional writing) to the HB / CD-R disc is executed in step 15 and the process is terminated. On the other hand, if the condition information is not satisfied in the determination in step 14, an error message is displayed on the display unit in step 16, and this process is terminated without doing anything.

That is, according to the above-described processing, before writing data, data is written only when the writing method to the last track of the last session is the fixed-length packet method and the fixed packet length is 40h. The fixed packet length “40h” is an example, and other lengths can be applied.
In this way, the track writing method and the fixed packet length existing in the final session can be obtained by a method determined in advance by the standard, so that they can be read regardless of the usage environment of the HB / CD-R disc. The identity of the optical disc can be determined based on the information.

Next, the last session specific information described in the above process may be information indicating a characteristic structure of the file system existing in the last session.
Processing in that case will be described next.
FIG. 11 is a diagram showing a characteristic structure of ISO9660 which is a standard file system existing in the final session.
The structure shown in the figure is a standard ISO9660 structure when data is written by a general CD writing software program. That is, the last session is often arranged in the order of volume descriptor (VD) group, path table information, predetermined information “¥”, directory information (Dir1, Dir2), and actual file data (file 1).

FIG. 12 is a diagram showing a characteristic structure of the file system existing in the final session according to this embodiment.
In the structure shown in the figure, the last session is arranged in the order of a volume descriptor (VD) group, directory information (Dir1, Dir2), actual file data (file 1), path table information, and predetermined information “¥”. Yes. In other words, the path table information and the root directory information are intentionally placed after the actual data of the file, and before the data is written, the location information of the root directory and the path table information is acquired, and these are the actual information of the file. Write data only if it exists after the data.

  When a write command is received from the main function processing unit 24, the write function processing unit 25 acquires a characteristic structure of the file system existing in the final session of the writable area of the HB / CD-R disc to be written, Reference is made to predetermined condition information “structure shown in FIG. 12”. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “structure shown in FIG. 12” (whether or not they match), and if they satisfy (or matches), writing to the HB / CD-R disc is performed. (Appendix) is executed to end this process. On the other hand, if the above condition does not satisfy the condition information “structure shown in FIG. 12” (does not match), an error message is displayed on the display unit 20, and this process is terminated without doing anything.

FIG. 13 is a diagram showing a characteristic structure of another file system existing in the final session according to this embodiment.
In the structure shown in the figure, there are a large number of SVDs after the PVD, for example, a total of ten SVDs # 0 to # 9.
That is, the number of SVDs is acquired before data writing, and data is written when it is “10”.

When a write command is received from the main function processing unit 24, the write function processing unit 25 obtains how many SVDs are behind the PVD of the last session in the writable area of the HB / CD-R disc to be written, Reference is made to predetermined condition information “10”. Thereafter, it is determined whether or not the acquired specific information satisfies the condition information “10” (whether or not they match), and if they satisfy (or matches), writing (additional writing) to the HB / CD-R disc is performed. Execute this to finish this process. On the other hand, if the condition information “10” is not satisfied (does not match) in the above determination, an error message is displayed on the display unit 20, and this process is terminated without doing anything.
In this way, since the structure of the file system existing in the final session can be obtained by a method determined in advance by the standard, it can be read regardless of the usage environment of the HB / CD-R disc. The identity of the optical disc can be determined.

Each of the specific information described above does not deviate from various standards and standards of the CD-R disc, and can be acquired in a general environment. That is, the specific information can be acquired from the optical disc device 2 by outputting a predetermined command from the PC 3 to the optical disc device 2.
For example, the number of tracks, the track length, and the like can be obtained by a read disc information (Read Disc Information) command or a read track information command defined by the MMC standard.
Further, the volume information can be acquired by a read command of the MMC standard based on the ISO9660 standard.

Next, although the specific information described above is not first reproduced in a general CD writing application, it may coincide with the accident.
Therefore, the specific information includes the volume information of the last session, the number of tracks existing in the last session, the track length information of the tracks existing in the last session, and the area not used by the file system existing in the last session. Specific information written in a predetermined sector, information indicating a fixed-length packet method that is a writing method to a track existing in the last session, information indicating a fixed packet length of a track existing in the last session, or existing in the last session If information combining any one of the information indicating the characteristic structure of the file system is combined, the accuracy of determining the feature of the optical disk can be further increased.

FIG. 14 is a flowchart showing still another process of the writing function processing unit 25 shown in FIG.
When a write command is received from the main function processing unit 24, the writing function processing unit 25 performs each of the final sessions in the writable area of the HB / CD-R disc to be written in step (indicated by "S" in the figure) 21. When the specific information is acquired, the first condition information A previously determined in step 22 is referred to, and it is determined whether or not the acquired first specific information satisfies the condition information A in step 23. Advances to step 24, and if the condition information A is not satisfied, advances to step 29.

In step 24, the second condition information B is referred to. In step 25, it is determined whether or not the acquired second specific information satisfies the condition information B. If satisfied, the process proceeds to step 26, and the condition information B If not satisfied, go to step 29.
In step 26, the Nth (N is a positive integer) th condition information N is referred to, and in step 27, it is determined whether or not the acquired Nth specific information satisfies the condition information N. If the condition information N is not satisfied, the process proceeds to step 29.
In step 28, writing (additional writing) to the HB / CD-R disc is executed, and this processing is terminated. On the other hand, in step 29, an error message is displayed on the display unit, and this process is terminated without doing anything.

The specific information includes the volume information of the last session, the number of tracks that exist in the last session, the track length information of the tracks that exist in the last session, Specific information written in a predetermined sector, information indicating a fixed-length packet method that is a writing method to a track existing in the last session, information indicating a fixed packet length of a track existing in the last session, or existing in the last session Using any of the information indicating the characteristic structure of the file system, the corresponding condition information A to N is described in advance in the HB disk application program and set in the RAM of the control unit when the HB disk application program is started. Like that.
In this way, by determining by combining a plurality of specific information, the accuracy of the feature determination of the optical disc is improved.

In addition, when satisfying each condition information described above and actually writing data, it is necessary to perform writing that satisfies the same condition information.
That is, if the condition information indicates that the number of tracks is “8”, when writing data, it is necessary to make eight tracks exist in a new session by filling it with dummy tracks or the like. If you don't want to add additional notes, you don't have to.

  In the above embodiment, the case where the HB disk application program according to the present invention is executed by the control unit of the PC has been described. However, the HB disk application program may be executed by the drive controller of the optical disk apparatus.

  The program according to the present invention can be generally applied to an optical disc apparatus in addition to a personal computer such as a desktop personal computer or a notebook personal computer.

It is a figure which shows the format of the area | region of the HB * CD-R disc which is one Embodiment of the recording medium which recorded the program based on this invention. FIG. 2 is a diagram showing a format (disc layout) of a recording area of the HB / CD-R disc 1 shown in FIG. 1. It is a figure which shows the structure of the volume descriptor of the ISO9660 file system in the 2nd session shown in FIG. 1 is a block diagram showing a configuration of an information recording / reproducing system including an optical disc apparatus for executing a program according to the present invention and a PC.

FIG. 5 is a flowchart showing processing of a writing function processing unit 25 shown in FIG. It is a figure which shows the structure of PVD by the standard of ISO9660. It is explanatory drawing of the number of tracks which exist in the last session. It is explanatory drawing of the track length of the track | truck which exists in the last session. It is explanatory drawing of the area | region which the file system which exists in the last session is not using. It is a flowchart figure which shows the other process of the writing function process part 25 shown in FIG.

It is a figure which shows the characteristic structure of ISO9660 which is a standard file system which exists in the last session. It is a figure which shows the characteristic structure of the file system which exists in the last session concerning this embodiment. It is a figure which shows the characteristic structure of the other file system which exists in the last session which concerns on this embodiment. It is a flowchart figure which shows the further another process of the writing function process part 25 shown in FIG.

Explanation of symbols

1: HB / CD-R disc 2: Optical disc device 3: PC 4: External interface 10: Spindle motor 11: Rotation control unit 12: Optical pickup 13: Actuator control unit 14: Signal control unit 15: Laser drive circuit 16: Buffer 17: Drive controller 20: Display unit 21: Input unit 22: Control unit 23: GUI processing unit 24: Main function processing unit 25: Write function processing unit 30: Read-only area 31: Writable area

Claims (9)

  Only when the specific information of the last session already written in the writable area of the recording medium having the read-only area and the writable area is acquired in the computer, and the acquired specific information satisfies a predetermined condition A program for executing a procedure for writing to the recording medium.   The program according to claim 1, wherein the specific information is volume information of the last session.   The program according to claim 1, wherein the specific information is information on the number of tracks existing in the last session.   2. The program according to claim 1, wherein the specific information is information on a track length of a track existing in the final session.   2. The program according to claim 1, wherein the specific information is unique information written in a predetermined sector in an area not used in the file system existing in the last session.   2. The program according to claim 1, wherein the specific information is information indicating a writing method to a track existing in the last session.   2. The program according to claim 1, wherein the specific information is information indicating a fixed-length packet method which is a writing method to a track existing in the last session and information indicating a fixed packet length of a track existing in the last session. program.   The program according to claim 1, wherein the specific information is information indicating a characteristic structure of a file system existing in the final session. Only when the specific information of the last session already written in the writable area of the recording medium having the read-only area and the writable area is acquired in the computer, and the acquired specific information satisfies a predetermined condition In a program for executing a procedure for writing to the recording medium,
The specific information includes the volume information of the last session, the number of tracks existing in the last session, the track length information of tracks existing in the last session, and the area not used in the file system existing in the last session. Specific information written in a predetermined sector, information indicating a fixed-length packet method that is a writing method to a track existing in the last session, and information indicating a fixed packet length of a track existing in the last session, or A program that is a combination of a plurality of pieces of information indicating the characteristic structure of the file system existing in the final session.

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