KR20050090289A - Data writing control method for recording optical disc - Google Patents

Abstract

A data recording control method of an optical recording device is disclosed. A data recording control method of an optical recording apparatus according to the present invention comprises the steps of: generating and recording a management information list for data recorded on an optical medium, generating and storing history information on data recorded on an optical medium, and optical Retrieving whether or not to restore the data corresponding to the restore command based on the history information, and when data corresponding to the restore command is present in the optical medium. Restoring management information corresponding to the step of generating and recording the management information list. As a result, the optical recording device can restore and reproduce the deleted data.

Description

Data writing control method for recording optical disc}

The present invention relates to a data recording control method of an optical recording apparatus, and more particularly, to a data recording control method of an optical recording apparatus capable of restoring deleted data of an optical medium.

An optical medium is an optical storage medium capable of recording information by optical means. CDs (Compact Discs) and DVDs (Digital Versatile Discs) are most widely used, and AOD (Advanced Optical Disc) and BD (Blue Ray Disc) High density optical storage media such as) have also been developed. In particular, the DVD is divided into DVD-RAM, DVD-RW, and DVD + RW according to the physical structure and recording method, and the recorded data can be deleted and rewritten.

When video data is recorded on the optical recording medium, the video data is recorded in 'title' units, and the reproduction management information for a plurality of titles recorded in the data area is stored in the management information recording area assigned to the data area. It is recorded temporarily. In addition, the reproduction management information temporarily recorded in the management information recording area is recorded in a predetermined area of the data area as video management information (VMI) based on the recording completion signal, which is generally referred to as 'finalization'. At this time, before the finalization is performed, data can be additionally recorded and the recorded data can be deleted.

When data recorded on the optical record carrier is deleted, the actual data is not deleted, only the management information recorded in the management information recording area is deleted. When the management information is deleted, the system does not recognize the data corresponding to the deleted management information, and also recognizes the area where the data is recorded as a blank area.

1 is a view for explaining a data recording control method of an optical recording apparatus for a conventional DVD.

As shown in FIG. 1 (a), according to the DVD standard, the disc includes a power calibration area (PCA), a record management area (RMA), a lead-in area (L / I area), a data area, and an L. / O Area (Lead-Out Area). As shown in Fig. 1B, the data area includes a file system (F / S) and a plurality of titles T1 to T3. FIG. 1C illustrates a state in which one title T2 of a plurality of titles is deleted. At this time, the deleted title T2 is not actually deleted but is only recognized as a blank area by the system.

1D shows a state in which a new title T4 is additionally recorded according to the DVD standard. When data is additionally recorded by the DVD, the additionally recorded data is overwritten in the area T2 recorded after the last recorded title T3 or recognized as an empty area by the system. The former case is shown in the figure.

FIG. 2 is a diagram for explaining a management information recording control method for the recorded data of FIG. Here, the management information includes size information of the title recorded in the data area, stored position information, information on the title name, and the like.

Referring to the drawings, Fig. 2A shows a state in which management information VMI1 to VMI3 for titles T1 to T3 recorded in the data area of Fig. 1A are sequentially recorded. When one title T2 is deleted, actual data is not deleted, only management information is deleted. At this time, as shown in (b) of FIG. 2, the system maintains the management information list for the first recorded titles T1 to T3 as it is, and refreshes the changed management information list for the deleted title T2. Create and record in addition to the management information recording area.

FIG. 2C shows a changed management information list when a title is additionally recorded as shown in FIG. 1D. The management information for the added title is added to the existing management information list to create a new management information list, and the new management information list is sequentially added to the management information recording area. The system reads only the list of management information most recently added, thereby determining the recording state of the data recorded on the optical recording medium.

By the way, the data recording control method of the optical recording apparatus according to the related art as described above grasps the recording state of the data of the optical medium only with the management information list which has been created most recently, and does not recognize the deleted data. Once data has been deleted, there is no way to restore the data even if the data remains.

The present invention was devised to solve the above problems, and an object thereof is to provide a data recording control method of an optical recording apparatus capable of restoring data when actual data remains even if a data deletion command is executed. do.

In accordance with another aspect of the present invention, there is provided a data recording control method of an optical recording medium, the method comprising: (a) generating and recording a list of management information on data recorded on an optical medium; Generating and storing history information on data recorded on the optical medium based on the list generated by the step; and (c) when a restore command for deleted data among the data recorded on the optical medium is input. Retrieving whether or not the data corresponding to the restoration command is restored based on the history information; and (d) if it is determined that the data corresponding to the restoration command exists by the step (c), the restoration is performed. And generating and recording a list in which the management information of the data corresponding to the command is restored.

Here, the history information may include information on whether new data is overwritten with the deleted data.

Preferably, (e) providing a list of deleted data based on the history information, and (f) inputting a restore command for any one of the lists provided by step (e). It further comprises a step.

In this case, it is preferable that the history information is stored in a memory provided in the optical recording device, or the history information is stored in a predetermined area provided in a data area of the optical medium.

Thus, the optical recording device can restore the data even if the data deletion command is executed, when the actual data remains.

Hereinafter, with reference to the accompanying drawings will be described in more detail the data recording control method of the optical recording device according to the present invention.

3 is a block diagram schematically showing an embodiment of the optical recording device according to the present invention. Referring to the drawings, the optical recording device 100 converts the recording target data into digital data and then performs signal processing such as error correction to convert the recording signal into a recording format (DSP: Digital Signal Processor (DSP) 140), The ENDEC unit 130 which encodes the recorded data converted to the recording format and decodes the encoded data, the spindle motor 170 which rotates the loaded optical disc 100a, records signals on the optical disc 100a, or records the optical disc ( Pick-up unit 110 for reading out the signal recorded in 100a), RF signal processing unit 120, pick-up unit 110 and spindle motor to filter out the signal detected by pickup unit 110 and output it as a binary signal Servo driver 160 for controlling the driving of the 170, a recording operation for recording data on the optical disc 100a, a control unit 150 for controlling the operation of deleting some of the recorded data and the finalize operation (finalize) operation And the user's key A user interface unit 180 for applying an operation signal to the controller 150 is provided.

The optical recorder 100 according to the present invention is a device for recording predetermined data on a recordable optical medium, and can be connected to various image sources such as a computer, a broadcast receiving antenna, a TV, or a hard disk drive. For example. Here, the recordable optical media may include storage media that can be recorded only once, such as CD ± R and DVD ± R, and recording media that may be repeatedly recorded, such as CD ± RW, DVD ± RW, and DVD-RAM. .

Here, the optical disc 100a is composed of a power calibration area (PCA), a record management area (RMA), a lead-in area (L / I area), a data area, and a lead-out area (L / O area). . In addition, a partial area of the data area includes a management information recording area for recording management information on at least one title for which recording has been completed. The management information is information related to reproduction of the recorded title, and includes title name, recording start address information, recording end address information, recording time information, title size information, and the like.

4 is a flowchart illustrating a data recording control method using the optical recording device of FIG. 3. Referring to the drawing, when a recording request signal is applied through the user interface unit 180, the controller 150 performs an operation of recording the recording target data applied from various image sources to the loaded optical disc 100a. The data recording operation is as follows.

First, when recording target data is input from various image sources, the DSP 140 converts the received recording data into digital data, performs signal processing such as error correction, and converts it into a recording format, and then converts the recording data into the ENDEC unit 130. to provide.

The ENDEC unit 130 compresses the digital data provided from the DSP 140 in a predetermined compression format (eg, MPEG-2) and transmits the digital data to the RF signal processing unit 120. The RF signal processing unit 120 transmits a predetermined signal. After the process is performed, the transfer to the pickup unit 110.

The pickup unit 110 irradiates a predetermined laser beam to the loaded optical disc 100a according to a signal input from the RF signal processing unit 120. As a result, data is recorded on the optical disc 100a.

The data to be recorded is recorded in the 'title' unit in the data area of the optical disc 100a. At this time, the controller 150 generates a list of management information for the data recorded on the optical disc 100a and records it in the management information recording area allocated to the data area (S301).

In the case of the DVD-R, additional recording of data is possible until the finalization is performed, and the data to be additionally recorded are sequentially recorded after the last recorded data. In addition, in the case of DVD + R, data can be additionally recorded until finalization is performed. In this case, data to be additionally recorded can be deleted to overwrite an area recognized as free space.

The controller 150 generates and stores history information on data recorded on the optical medium whenever there is a change in recording, deleting, or additional recording on the data recorded on the optical medium (S303).

For example, after the titles T1 to T3 are stored in the data area, as shown in Fig. 5A, the titles T2 and T3 have been deleted, and then the title T4 as shown in Fig. 5B. And T5 are further recorded. It is also assumed that the additionally recorded title T4 has been overwritten at the position of the deleted title T2, and the additionally recorded title T5 has been added after the deleted title T3.

In this case, as shown in FIG. 6, the optical recorder stores change processes such as recording, deleting, and additional recording of data recorded on the optical medium as history information. Here, the history information preferably includes information on whether new data about the deleted data is overwritten. In the figure, information indicating that the title T4 is overwritten at the position of the title T2 is indicated in parentheses.

The controller 150 generates a list of deleted data based on the history information, and provides a list (not shown) of the deleted data generated according to the user's selection (S305). The user can input a restoration command for selecting any one of the data provided by the controller 150.

When a restore command for any one of the deleted data is input by the user (S307), the controller 150 searches whether to restore the data corresponding to the restore command based on the history information (S307). At this time, the controller 150 searches whether or not other new data is overwritten with the deleted data selected by the user (S311). When the deleted data is kept as it is, the management information of the data corresponding to the restore command is restored. To this end, when the user deletes the data recorded on the optical medium, the management information deleted on the optical medium is stored in the memory (not shown) of the optical recording device 100 until the finalization by the optical recording device 100 is completed. Is stored temporarily).

When restored to the optical medium that was stored in the memory of the optical recorder 100, the controller 150 generates a management information list including the restored management information, and adds and records the generated management information list (S313). The change of management information recording according to the change of the data recorded on the optical medium is shown in FIG. That is, Fig. 7A shows the first data recording state of the optical medium, where titles T1 to T3 are recorded and management information corresponding to each title can be seen.

FIG. 7B shows a state in which the actual data is maintained as the title T2 and T3 is deleted by the user and the management information of T2 and T3 corresponding to the deleted data is deleted. Accordingly, when the optical recorder 100 reads data from the optical medium, the optical recorder 100 does not recognize the titles T2 and T3 and recognizes that only the title T1 is recorded on the optical medium.

FIG. 7C shows a list in which new titles T4 and T5 are additionally recorded on the optical medium, and management information corresponding thereto is added.

The control unit 150 stores the management information on the deleted titles T2 and T3 even if two titles T2 and T3 among the titles T1 to T3 recorded on the optical medium are deleted and new titles T4 and T5 are additionally recorded. Temporarily stored in the memory of (100).

Fig. 7D shows a new management information list when the deleted title T3 is restored. That is, since the new title is not overwritten by the deleted title T3, and the management information about the deleted title T3 is stored in the memory of the optical recording device 100, the controller 150 controls the operation of the optical recording device 100. The management information of the title T3 stored in the memory is restored to the optical medium, and a new management information list including the restored management information is generated and recorded.

If other new data is overwritten with data selected by the user through the deletion list, the controller 150 displays on the display that the deletion data selected by the user cannot be restored (S315). That is, as in the case of the deleted title T2, when another new title T4 is overwritten in the position where the actual data is stored, the controller 150 determines that the deleted title T2 cannot be restored based on the history information. According to the determination result, the display indicates that restoration of the title T2 is impossible.

 When the optical recorder 100 reads data from the optical medium, the optical recorder 100 determines the recording state of the optical medium based on the most recently created management information list of the recorded management information list.

Thus, the optical recording device can restore the data even if the data deletion command is executed, when the actual data remains.

According to the present invention, the optical recording device temporarily stores management information about the deleted data in the memory until the finalization is performed, and if the deleted data is maintained, when the restore command for the deleted data is input, the data is stored. Can be restored.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not limited to the specific embodiments of the present invention without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

1 is a view for explaining a data recording control method of an optical recording apparatus for a conventional DVD;

2 is a view for explaining a management information recording control method for the recorded data of FIG.

3 is a block diagram schematically showing an embodiment of an optical recording device according to the present invention;

4 is a flowchart showing a data recording control method of the optical recording device according to the present invention;

5 is a view showing an embodiment of a data change recorded on an optical medium;

6 is a view showing the history information of FIG. 5, and

FIG. 7 is a diagram illustrating a management information list of FIG. 5.

Explanation of symbols on main parts of drawing

100: optical recording device 110: pickup unit

120: RF signal processing unit 130: ENDEC unit

140: DSP 150: control unit

160: servo drive unit 170: spindle motor

180: user interface unit

Claims (5)

In the data recording control method of the optical recording device, (a) generating and recording a list of management information for data recorded on the optical medium; (b) generating and storing history information on data recorded on the optical medium based on the list generated by step (a); (c) searching for restoration of data corresponding to the restoration command based on the history information when a restoration command for deleted data among the data recorded on the optical medium is input; And (d) if it is determined by the step (c) that the data corresponding to the restoration command exists, generating and recording a list in which management information of the data corresponding to the restoration command is restored. A data recording control method for an optical recording device, characterized in that. The method of claim 1, And the history information includes information on whether new data has been overwritten on the deleted data. The method of claim 2, (e) providing a list of deleted data based on the history information; And and (f) inputting a restoration command for any one of the data in the list provided by step (e). The method of claim 3, wherein And the history information is stored in a memory provided inside the optical recorder. The method of claim 3, wherein And the history information is stored in a predetermined area provided in the data area of the optical medium.