JPH0677390B2 - Recording medium copy method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium copy method used in an electronic file system or the like for recording a large amount of document information and reproducing it.

2. Description of the Related Art In a general electronic file system, image information such as a document or a drawing is read by optical two-dimensional scanning and converted into an electric signal, and data compression processing is performed on the image information to record it on an optical disc. Management information such as a recording address, a title and a keyword for retrieval is encoded and recorded on the same optical disc. The management information is composed of a management aggregate of a large number of image information (this is referred to as one document), and is recorded in an area different from the image information.

To retrieve the required document from the optical disc, for example, enter the title or keyword of the document. Then, the relevant title or keyword is searched from the above management information, the recording address of the image information of the relevant document is known from that, and the image information is read and supplied to the CRT display device, printer, or the like.

In order to make a copy of a recorded optical disc, at least two optical disc devices for recording and reproducing information on the optical disc are connected to the system. Conventionally, all of the image information and management information of the optical disc to be copied (referred to as the original disc) has been reproduced, and all has been recorded on the new optical disc (referred to as the copy disc). Hereinafter, this copy method will be referred to as simple copy.

Problems to be Solved by the Invention In a usual electronic file system, when a document recorded on an optical disk becomes unnecessary later, the document information on the optical disk is not physically erased but the document is deleted. The document deletion is logically processed by registering the document deletion information indicating that the document has been deleted in some storage means.

Therefore, in many cases, the information of the optical disc that has been used for a long time includes documents that are unnecessary and have been deleted and registered. However, in the conventional simple copy, since all the information of the original disc is recorded on the copy disc as it is, there is a problem that even a document which is unnecessary and is deleted and registered is copied.

In order to solve this problem, the present applicants have previously developed the following copy method called logical copy.

To adopt this method, the above document deletion information is additionally recorded on the optical disc itself. When performing logical copy, the document deletion information of the original disk is read, the unit document registered for deletion is first recognized, and the other documents are copied in the next procedure. The pointer (the start address and the end address of the sector in which the image information of the document is recorded) in the management information of a certain unit document is read, and the image information of the corresponding document is read according to the pointer and recorded in the copy disk. At this time, new management information for the copy disk is created. Do this for all undeleted documents, then record new management information on the copy disc.

As described above, according to the logical copy in which the copy process is performed according to the management information and the deletion information for each unit document, a copy disc can be created excluding the documents registered for deletion. However, this logical copy causes another problem as follows.

Document registration on an optical disc includes recording formation called duplicate registration. An example thereof is shown in FIG. In this example, the information recorded at the addresses a to b in the image information area is registered as the document A, the information recorded at the addresses c to d is registered as the document B, and the information recorded at the addresses c to e is registered. Registered as document C.

That is, the information of the addresses c to d is not only the document B but also a part of the document C. This is duplicate registration.

When an optical disc having such duplicate registration is copied by the logical copy method, the duplicate document B and document C are treated as completely independent and are copied. That is,
The information of the addresses c to d of the original disc is transcribed to an address of the copy disc and registered as the document B, and the information of the addresses c to e of the original disc is transcribed to another address of the copy disc and registered as the document C. It As a result, there is no duplication on the copy disc.

Here, if there is a large amount of duplicate registration information on the original disc, if the duplication is eventually resolved by logical copy, the formal information amount on the copy disc side will increase and will not fit within the copy disc capacity. It may disappear.

The present invention has been made in view of the above-mentioned conventional problems, and provides a recording medium copy method capable of appropriately dealing with both deletion registration and duplicate registration by using both the above simple copy and logical copy. The purpose is to

Means for Solving the Problems In the method of the present invention, the document deletion information is recorded on the optical disc itself. In addition, as information for indicating whether or not there is duplicate registration, the management information is the total number of sectors in which the number of sectors used for recording each unit document is added in duplicate for other unit documents containing the same information. Record it inside.

Then, when copying information from the disk A to the disk B, the number of sectors actually used in the disk A is compared with the above-mentioned total number of sectors to determine whether or not there is duplicate registration. If there is duplicate registration, it is processed by the simple copy.

If there is no duplicate registration, it is next determined whether or not there is a deletion registration. If there is no deletion registration, it is a simple copy, and if there is a deletion registration, it is a logical copy.

Effect According to simple copy, even if there are many duplicate registrations on the original disc, there is no increase in the amount of information on the copy disc side and there is no risk of overflow.

According to the logical copy, the document registered for deletion on the original disc is not copied.

Embodiment FIG. 1 shows a procedure of a copying method according to an embodiment of the present invention, and FIG. 2 shows an information recording format of an optical disk when the present invention is applied.

First, the information recording format will be described with reference to FIG. The information on the optical disc is roughly divided into image information of a document, management information for each unit document, and document deletion information, and recorded in allocated areas 100, 200, and 300, respectively.

In this example, the image information recorded in the 40 sectors of the addresses a to b in the image information area 300 is registered as the document A. That is, as the management information of the document A in the area 300, the start address a, the end address b, the number of sectors “40”, and the total number of sectors “40” are recorded.

Further, the image information recorded in the 60 sectors of the addresses cd of the image information area 300 is registered as the document B. That is, as the management information of the document B, the start address c, the end address d, the number of sectors “60”, and the total number of sectors “100” are recorded. The total number of sectors “100” is a value obtained by adding the number of sectors “40” of the document A and the number of sectors “60” of the document B.

Further, the image information recorded in the 100 sectors of the addresses c to e in the image information area 300 is registered as the document C. That is, as the management information of the document C, the start address c, the end address e, the number of sectors “100”, and the total number of sectors “200” are recorded. The total number of sectors “200” is a value obtained by adding the number of sectors of document A “40”, the number of sectors of document B “60”, and the number of sectors of document C “100”.

Here, it is assumed that only the documents A, B, and C are recorded on the optical disc of FIG. Since the document B and the document C are redundantly registered as shown in the figure, the total number of sectors of the last document C is "200", while the number of sectors actually used for recording in the area 300 is "140". is there. From this difference, it can be seen that there are duplicate registrations for 60 sectors.

Further, in the example of FIG. 2, deletion information to the effect that the document A is deleted is additionally recorded in the area 200.

Based on the above information recording format, copying is performed according to the processing procedure shown in FIG.

First, in step 400, it is determined whether or not the original disc has duplicate registration. As described above, this determination is performed by checking whether or not the total number of sectors of the last document is larger than the number of actually used sectors.

If there is duplicate registration, in order to prevent overflow on the copy disk side, the processing proceeds to steps 601, 602, and copying is performed by the above-mentioned simple copy method. That is, all the information on the original disc is reproduced and recorded on the copy disc.

If there is no duplicate registration, the process proceeds to step 500 to check whether there is a deletion registration. This is done by examining the information in area 200 of the original disc. If there is no deletion registration, in order to speed up the copying process, the process proceeds to steps 601, 602 and the simple copying method is used.

If there is a deletion registration, in order to copy except the deleted registration document, the process proceeds to steps 701 to 706 and is processed by the above-described logical copy method.

First, set the document number pointer to the beginning (step 70
1) Read the management information of the document indicated by the pointer and confirm that it has not been processed to the end (step 70).
2) Next, it is checked whether or not the document indicated by the pointer is registered for deletion (step 703). If not, steps 704 and 705 are executed. That is, the image information of the document is read in accordance with the start address and the end address of the management information and transferred to the copy disc, and the management information for the copy disc is created and recorded in the copy disc. If the document indicated by the pointer is registered for deletion, steps 704 and 705 are not executed. Then, in step 706, the document number pointer is incremented, and the process returns to step 702. The above process is repeated until the last document. As a result, only the documents that are not registered for deletion are transferred to the copy disc.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the simple copy and the logical copy are properly used, so that the overflow prevention on the copy disk side and the unnecessary document can be performed depending on the situation of the original disk side. Each of the above-mentioned effects such as removal of the data and improvement of the copying speed can be obtained, and the efficient and efficient copy processing can be realized.

[Brief description of drawings]

FIG. 1 is a flow chart showing a processing procedure of one embodiment of the copying method of the present invention, and FIG. 2 is a diagram showing an example of an information recording format of an optical disk on which the present invention is premised. 100 …… Document management information area, 200 …… Document deletion information area, 300 …… Image information area

Claims (1)

[Claims] 1. A physical document information amount on a recording medium to be copied when a cumulative value of all information amount including a duplicate recording amount is recorded as a part of management information together with recording of the document image information. The presence or absence of duplicate registration is determined by comparison with the cumulative value. Only when there is no duplicate registration and there is deletion information that does not require copying, each unit document information other than the deletion information is sequentially copied according to the management information. In the case of, the recording medium copying method is characterized in that all of the document information and management information are copied.