JPH03250342A - Information recording device - Google Patents

Abstract

PURPOSE:To easily secure an unreproducible state for the undesired user information and to attain the effective processing for an information recording device with a reduced loss time by deleting the control information corresponding to the user information that has not to be read out of an optical disk. CONSTITUTION:An input means 4 is provided to designate the user information that can be read out of a recording medium 1, and a control means 6 deletes the control information corresponding to the user information except the one designated by the means 4 out of an area where the control information on the medium 1 is recorded. Thus the control information corresponding to the user information that has not to be read out is deleted out of the medium 1 in accordance with the input of the user information from the means 4. Then the undesired user information can be easily read out and set in an unreproducible state.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to information recorded arbitrarily by a user (hereinafter referred to as user information) together with management information for reading the user information. This relates to a recording device.

(b) Conventional technology In rewritable information recording devices, in order to manage user information that users can freely read and write, the management information such as the recording position is different from the area in which the user information is recorded. recorded in the area. Reading of user information is realized by referring to management information.

For example, MS-DO5 (registered trademark of Microsoft Corporation)
, user information is recorded in the user area, and management information is recorded in an area called a file allocation table and directory (for example, [Introductory MS-DO5J
Written by Yasuharu Murase, see ■Published by ASCII).

2. Description of the Related Art In recent years, optical discs, in which information is recorded or reproduced using a light beam such as a laser beam, have attracted attention as a new recording medium. In storage media such as optical disks (including magneto-optical disks), real-time data such as music information and image information is often recorded as user information, and in such cases, the time on the disk is recorded as management information. Information (time information such as elapsed time from a certain standard) is used as management information.

Normally, when time information is used as management information, at least the user information number, recording start time, and recording end time are recorded as the management information.

If new user information is written on top of the recorded user information on a recording medium that already has user information recorded, the amount of data of the previously recorded user information may be greater than the newly recorded user information. If the time is too long, the previously recorded user information will remain after the newly recorded user information.

For example, first 5 user information (5 music information) is 6
For those recorded for 0 minutes (see Figure 2 A)
, three new pieces of music information (three pieces of user information) were recorded for 30 minutes from the beginning, and the recording of the third piece of music information ended in the middle of the third piece of music information that was recorded earlier. shall be.

Then, the newly recorded 3 is displayed in the user information recording area.
1 music information, the remaining part of the 3rd music information that was recorded earlier, and the 4.5th music information are recorded, and the management information of these 6 music information is recorded in the management information recording area. (See Figure 2B).

(c) Problems to be solved by the invention However, when the user information is real-time data such as music information as described above, information after newly recorded user information (previously recorded user information N) is often unnecessary.

At that time, it is preferable that information subsequent to the newly recorded user information cannot be read and reproduced.

Therefore, a possible solution is to write information indicating the end of the user information in the user information recording area and prevent the user information from being read and reproduced thereafter.

However, in the case of the method of writing information indicating the end of the user information in the user information recording area, the information indicating the end of the user information must be written in real time while the user information is being recorded or played back, resulting in a large amount of loss time. Unable to process efficiently.

The present invention has been made in view of the above problems, and provides an information recording device that can easily read unnecessary user information recorded in a user information recording area and make it impossible to reproduce it. It is.

(D) Means for Solving the Problems The present invention provides a recording medium having a recording area for recording user information and an area for recording management information for reading user information corresponding to the user information. An information recording device that records management information in each recording area of a recording medium, comprising an input means for specifying user information that can be read from the recording medium, and user information other than the user information specified by the input means. and control means for deleting management information corresponding to the management information from an area of the recording medium in which management information is recorded.

(E) User information that no longer needs to be read out is no longer read from the recording medium because the management information corresponding to the user information that is no longer needed is deleted from the recording medium in accordance with the input from the input means.

(f) Example FIG. 1 is a schematic diagram of an embodiment of the apparatus of the present invention.

(1) is a rewritable optical disc as a recording medium,
It has a user information recording area in which user information is recorded as a recording area, and a management information recording area in which management information for reading the user information is recorded in correspondence with the user information.

(2) is a disk control circuit that records information on the optical disk (1) and reads recorded information, and performs processing such as disk rotation control, modulation of recorded information, demodulation of read information, and error correction. conduct.

(3) is a RAM, which has, in addition to a work storage area, a management information storage area for storing management information for reading out user information recorded on an optical disk loaded in the apparatus. This management information recording area contains management information such as the recording start time and recording end time recorded for each user information, as well as the number of the first user information recorded on the optical disc, the number of the last user information, and the number of the last user information recorded on the optical disc. The end time of recording user information is recorded.

(4) is an input circuit as an input means for inputting the last user information number of the user information that is required when the user information recorded on the optical disc is no longer needed.

(5) is a management information control that reads management information stored in the RAM (3) and generates management information according to the last user information number of the required user information inputted by the input circuit (4). It is a circuit. The management information generated by the management information control circuit (5) is transmitted to a control circuit (6) to be described later.
The data is stored in RAM (3) via.

(6) is a control circuit that controls the entire device, and RAM (3
) has a function as a control means for recording the management information stored in the management information storage area of the optical disc via the disc control circuit (2).

Now, as shown in FIG. 2A, five pieces of user information (if it is music information, five
If a song) is recorded, management information is recorded in the management information recording area in correspondence with the user information.

When this optical disc (1) is installed in the main body of the apparatus, the control circuit (6) reads the management information recorded in the management information recording area of the optical disc (1) via the disc control circuit (2), and reads out the management information that has been read out. is stored in the management information storage area of RAM (3).

When reading the user information recorded on the optical disc (1) in this state, the control circuit (6) that has received the instruction to read the user information uses the management information stored in the management information storage area of the RAM (3) to read out the user information. The disk control circuit (2) is controlled to read desired user information. The read user information is transferred from the control circuit (6) to a host system (not shown). If the read user information is music information, it is played back and output in real time.

Here, it is assumed that three pieces of new user information are recorded on this optical disc (1) from the beginning of the user information recording area. If the recording of the third user information of the newly recorded user information is finished midway through the third user information of the previously recorded user information, as shown in FIG. 2B, the optical disk In the user information recording area (1), the three newly recorded user information, the remaining part of the previously recorded third user information, and the 4th and 5th user information are recorded. , these 6 are in the management information recording area.
Management information for user information is now recorded.

If the user determines that user information other than the three newly recorded user information is unnecessary, the user inputs a change in the readable range from the input circuit (4), and further changes the user information in the readable range. Enter the last user information number, in this case "3".

Upon receiving a signal from the input circuit (4) to change the range in which user information is managed, the management information control circuit (5) generates management information according to the input user information number. That is, "1" is the number of the first user information recorded on the optical disc, "3" is the number of the last user information,
The recording end time of the third user information is set as the recording end time of the last user information, and the management information stored in the management information storage area of RAM (3) is read out, and the recording of up to the third user information is started. The time and recording end time are prepared in the order of user information (see FIG. 2C).

Then, when the input circuit (4) inputs a confirmation to change the management range of the user information, the management information control circuit (5) transfers the generated management information to the RAM via the control circuit (6).
It is stored in the management information storage area (3).

Further, the control circuit (6) transfers the management information stored in the management information storage area of the RAM (3) to the disk control circuit (2).
The information is recorded in the management information recording area of the optical disc via the optical disc.

As shown in Figure 2C, although six pieces of user information are recorded on the optical disc (1), only the management information corresponding to the first three pieces of user information is recorded (unnecessary). The management information corresponding to the user information is deleted), and only the three pieces of user information can be read and reproduced from the beginning.

In this embodiment, what is input and specified as readable user information from the input circuit (4) is the last user information number among the readable range of user information, but it is not necessary to limit it to this. It may be the number of the first user information of user information that is not readable or unreadable, or the number of user information that is readable or unreadable may be input individually.

(G) Effects of the Invention As is clear from the above description, the present invention records only the management information corresponding to the user information that needs to be read and reproduced out of the user information recorded on the optical disk, and Since the management information corresponding to the unnecessary user information is deleted from the optical disc, only the user information on which the management information is recorded and which needs to be read and reproduced is read and reproduced.

Rather than directly erasing user information that does not need to be read and reproduced, only its management information is deleted, so unnecessary user information can be easily made unreproducible.
This enables efficient processing with less loss time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the apparatus of the present invention, and FIG. 2 is an explanatory diagram of the operation of the embodiment of the present invention. (1)...Optical disc (recording medium), (2)...Disc control circuit, (3)...RAM, (4)...Input circuit (input means), (5)...Management information control circuit,
(6)...Control circuit (control means).

Claims (1)

[Claims] (1) A recording medium having a recording area for recording user information and an area for recording management information for reading user information corresponding to the user information, and storing user information and management information in each recording area of the recording medium. An information recording device for recording includes an input means for specifying user information that can be read from a recording medium, and management information corresponding to user information other than the user information specified by the input means for recording management information of the recording medium. 1. An information recording device comprising: control means for deleting data from an area in which data is deleted.