JP2003272174A - Information recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect data without losing the index information of a hybrid disk. <P>SOLUTION: A writing is performed so as to reach a total of 98 sessions by adding a dummy session apart from a content to be originally recorded in a read only region 1 when shipping the hybrid disk. When the hybrid disk is shipped in this state, a writing session by a user resides in the 99th session located in the write once region 2, and single writing becomes impossible hereafter. Since an index information is immobilized, read can be continued without missing a file. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid disc recording method and, more particularly, to an information recording medium which is handed to a user after recording data in advance.

[0002]

2. Description of the Related Art Today, due to the popularization of high-performance, low-priced personal computers, a CD-ROM drive as a data transfer device for tens to hundreds of MBs, a CD-R that can be written only once, Rewritable CD-RW and DVD drives have come to be installed as standard equipment in PCs.

At present, as a disk medium which can be read by these drives, a music CD / CD-ROM / DVD-on which data is recorded by stamp shaping at the shipping stage.
ROM and CD-R / which does not record data at the time of shipment, but records data by user writing process
There are CD-RW / DVD-R / DVD + RW and the like.

There is also a recording medium called a hybrid disc which has both of these functions. The hybrid disc has a read-only area in which data is written in advance and a writable write-once area.

As a method of using such a hybrid disc, for example, it is conceivable to use it based on application software or data recorded in the read-only area and write the processed result in the additionally recordable area. Writing to the additionally writable area is performed in units of a lead-in section, a data section, and a lead-out section called a session.

Writing to a session can be performed any number of times as long as there is a remaining capacity, but a single CD is allowed only up to 99 times (session). Further, at the time of this additional writing, it is possible to select whether or not to carry over the table-of-contents information indicating the written contents in the lead-in portion of the previous session.

When the data is not taken over, there is no table of contents information indicating the previously written contents, so that the contents cannot be searched for, so that the contents before the actual cannot be referred. Writing to the CD requires a dedicated application program, and whether to take over the previous contents can be set in this. It is possible to use an application program prepared by the user as the writing application program, but it is also possible to include it in the read-only area of the hybrid disc.

[0008]

However, when an application program prepared separately by the user is used,
It is conceivable that the previous data will be lost by inadvertently writing it without taking over. There is a problem that the risk of this data loss is further increased by adding several times.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an information recording medium in which data is protected without losing the index information of the hybrid disc.

[0010]

[Means for Solving the Problems] As a use of a hybrid disc, it is not necessary to perform additional writing several times, and there is a case where the purpose can be achieved if writing can be performed only once. In such a case, it is possible to protect the data content by prohibiting additional writing thereafter. Writing to a CD can be performed as many times as there is remaining capacity, but the standard (Red Book) is only allowed up to 99 times for one CD.

Therefore, in the present invention, 98 sessions are written in advance in the read-only area by taking advantage of the fact that the hybrid disk is capable of writing in the read-only area at the shipping stage. Placing the last 99th session in the feasible area makes it impossible to add data thereafter.

[0012] In a hybrid disc which can be completed by writing only once, additional writing becomes impossible by the writing once, and it is possible to make a disc in which data can be continuously read without losing the table of contents information thereafter.

According to the above method, the read-only area has 9
I decided to make 8 sessions, but the lead-in section, the data section,
One session consisting of the lead-out section requires at least 1 to 2 minutes of capacity.
There is a problem that it cannot fit in the D (hybrid disc).

As a means for prohibiting additional recording, a standard has been established for writing 99 tracks in addition to writing 99 sessions on one CD. Therefore, in the present invention, 98 tracks are written in advance in the read-only area at the shipping stage, and the last 99th track is arranged in the additionally recordable area to be written by the user, thereby making additional recording impossible.

The minimum capacity required for one track is a few seconds, and even when 98 tracks are written in the read-only area, the remaining capacity including the additionally recordable area can be sufficiently secured. As a result, in a hybrid disc that can be completed by writing only once, since the writing of one time is the last and additional recording is not possible after that, it is possible to make a disc in which data can be continuously read without losing the table of contents information.

In each of the above-mentioned methods, a dummy session or a dummy track is written in the read-only area of the hybrid disc, and the write-once area is set to the write-disabled area at the end to make the write-inhibit state ineffective. Information indicating that additional recording is not possible is not written. CD
At the time of writing, it is possible to write information that the disc is closed (additional writing is impossible) by the writing process of this time to the disc itself. Therefore, in the present invention,
An application program dedicated to CD writing is placed in the read-only area of the hybrid disc, and it is set to always close the disc. Alternatively, a normal application program is provided with a CD writing function as a data storage destination, and the disc is always set to be closed and stored in a read-only area.

As described above, by writing the non-writeable information on the actual disc, the disc can be made to be able to continue reading data without losing the table of contents information.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows the structure of a hybrid disc. Music CD and C on the inner circumference of the disc
There is a read-only area 1 in which data is written at the shipping stage from the manufacturer such as a D-ROM. This area 1 may be secured by forming a master disk on which data is recorded in advance and stamping it from there, but it is formed from the same material as the recordable area on the outer periphery and is later formed into a CD-R or CD-RW drive. May be secured by writing data.

There is a recordable area 2 on the outer peripheral portion, which is blank at the shipping stage. Further, the read-only area 1 and the additionally recordable area 2 can be distinguished in units of sessions. Read-only area 1 in the first session,
The additionally recordable area 2 is generally arranged after the second session.

As shown in FIG. 2, a session is a unit composed of a lead-in section, a data section, and a lead-out section. In ISO9660 which is a file system of a CD, it is a rule to search each file and folder, and further information of each session after the first session from the table of contents information in the lead-in part of the innermost session (first session). . In the writing after the first session, the table of contents information indicating the contents of the writing in the lead-in part of the session before that is read, and the contents information indicating the contents to be written this time is added to or deleted from the contents and recorded in the lead-in part of itself. To do. At this time, it is possible to refer to all the table-of-contents information and select whether to take over or not to take over at all. If the data is not handed over, the table of contents information indicating the previously written contents is lost, so that the contents before the actual contents cannot be referred to. For this reason, when adding a session by writing, the data may be accidentally written without being taken over and the previous data may be lost.Furthermore, the additional write several times may increase the risk of data loss. , As described above.

Therefore, a data protection method of a hybrid disc according to the present invention which does not lose data will be described.

FIG. 3 is a diagram for explaining a protection method according to the first embodiment of the present invention. The hybrid disc is not required to be added several times as a usage of the hybrid disc, and it may be sufficient if the writing can be performed only once. For such a purpose, the data content can be protected if additional recording can be prohibited thereafter. Writing to a CD can be done as many times as there is remaining capacity, but the standard (Red Book) allows only 99 sessions for a single CD.

Therefore, by utilizing the fact that the writing to the read-only area 1 can be made in advance at the shipping stage, which is a feature of the hybrid disc, in addition to the contents to be originally recorded in the read-only area, the dummy session is performed. Is added, and writing is performed so that a total of 98 sessions are performed. In this case, it is not necessary to divide the contents to be originally recorded into 98, and the contents should be recorded together in the first session and
Empty sessions are allowed from 1 to 98 sessions. Here, of course, the information of the first session is set to be inherited at any time.

When the product is shipped in this state, the writing performed by the user is the 99th session in the additionally recordable area 2, and additional recording cannot be performed thereafter. After this, the table of contents information is fixed so that you can continue reading without losing the file.

FIG. 4 is a diagram for explaining a protection method according to the second embodiment of the present invention. In FIG. 4, a unit called a track is used instead of the session of the first embodiment. A session consisting of the lead-in section, data section, and lead-out section requires at least 1 to 2 minutes of capacity, and 98 sessions cannot be placed in a 74-minute CD, but a unit called a track is used. In this case, the minimum capacity required for one track is a few seconds, 98 tracks can be arranged in the read-only area 1, and a sufficient remaining capacity can be secured in the additionally recordable area 2.

There is a standard that up to 99 tracks can be written on one CD. By utilizing this, 98 tracks are written in advance in the read-only area at the shipping stage. In this case, the content to be originally recorded is 98
It is not necessary to divide it, and it is possible to collectively record on the first track, and empty tracks from 2 to 98 tracks. As a result, the writing performed by the user in the additionally writable area 2 is the 99th track, and it is possible to prevent additional writing thereafter. Therefore, thereafter, the data can be continuously read without losing the table of contents information.

In the above-described first and second embodiments, a dummy session or a dummy track is written in the read-only area 1 of the hybrid disc, and the user writes in the additionally writable area 2 to indirectly make the additionally writable state appear. Met.

However, no information indicating that writing is not possible is not written on the actual disc. Some CD writing application programs can be set so that the information of closing the disc (making additional recording impossible) can be written on the disc itself. This is because the lead-in area has a portion for recording information for the next session, and there is a flag indicating the presence / absence of the next session therein. By setting this flag, the next session cannot be created (additional writing cannot be done). In this case, the read-only area 1 can be used as the first track of the first session and the recordable area 2 can be used as the second track of the second session.

However, in the CD writing application program prepared separately by the user, this setting is arbitrarily performed by the user, and therefore writing is not always executed in the non-writeable setting. Therefore,
A CD writing application program is built in the read-only area of the hybrid disc, and a mechanism is provided such that writing to this hybrid disc is performed by the built-in application.

In this CD writing application program, a specific flag in the lead-in area must always be set to indicate that there is no next session when writing. In this case, the CD writing application program may exist alone or may have a writing function as a part of the processing of another application program. Alternatively, a CD write-only application program is placed in the read-only area of the hybrid disc, and it is set to always close the disc. Therefore, 9
When recording of the 9th session (or 99th track) is completed, the disc is automatically closed and additional recording cannot be performed.

As described above, by writing the non-writeable information on the actual disc, it is possible to make the disc continue to be able to read data thereafter without losing the table of contents information.

[0032]

As described above, according to the present invention, the following effects can be obtained. (1) Additional writing is disabled by writing once, and data can be continuously read without losing the table of contents information. (2) By writing the non-writeable information on the actual disc, it is possible to continue reading the data without losing the table of contents information.

[Brief description of drawings]

FIG. 1 shows the structure of a hybrid disc.

FIG. 2 shows a session including a lead-in part, a data part, and a lead-out part.

FIG. 3 is a diagram illustrating a protection method according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a protection method according to a second embodiment of the present invention.

[Explanation of symbols]

1 Read-only area 2 Recordable area

Claims (3)

[Claims] 1. An information recording medium having a read-only area and a writable area, wherein information recording is performed in recording units, where (n is the maximum number of the recording units).
-1) recording the recording units in the read-only area,
An information recording medium, wherein only the nth recording unit is recorded in the writable area. 2. The information recording medium according to claim 1, wherein the recording unit is a session or a track, and the n is 99. 3. The information recording medium according to claim 1, wherein additional recording on the information recording medium is disabled when recording on the n-th recording unit is completed.