JP2002222565A - Method of restoring abnormally recorded file of disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a method of restoring an abnormally recorded file of a disk recording and reproducing device which makes use of the abnormally recorded file when the abnormally recorded file where a file index does not exist is recorded. SOLUTION: The temporary information different from the intrinsic information is imparted to the data index of the frame data recorded at the disk and the file index of the file written at the point of the time the writing of the files of a prescribed unit to the disk ends is formed. The temporary information is thereafter rewritten and is restored to the intrinsic information. The temporary information described above is detected in turning on of a power source and the presence of the abnormally recorded file where the file index does not exist is detected by detecting this temporary information. When the abnormally recorded file exists, the file index of the abnormally recorded file is formed and the abnormally recorded file is restored by rewriting the temporary information of the abnormally recorded file and returning the information to the intrinsic information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable disk recording / reproducing apparatus for recording a file and a file index on a disk, wherein the abnormal recording file having no file index is recorded on the disk. Particularly, a disk recording / reproducing apparatus that makes use of an abnormal recording file when an abnormal recording file having no file index is recorded on a disk due to power being cut off during recording on the disk And a method of restoring an abnormal recording file in the above.

[0002]

2. Description of the Related Art In a digital video camera or a digital still camera, a disk recording / reproducing using an optical disk or a magneto-optical disk as a recording medium for recording photographed image data in response to the need for a large capacity and high speed editing function. Some devices have built-in devices.

In such a disk recording / reproducing apparatus, when a writing operation to a disk is performed at a speed close to the performance limit, such as when a moving image is shot by a camera, the actual data of a file such as image data is read. Are sequentially recorded on a disk, a file index of directory structure information in the file is generated and recorded on the disk.

[0004] Therefore, there is a fear that the battery is removed from the camera body before the file index is recorded on the disk after the photographing is completed and the power supply to the disk recording / reproducing apparatus incorporated in the camera is interrupted. .

[0005]

When the power supply to the disk recording / reproducing device is interrupted in this way,
The disc is in a state where an abnormal recording file for which no file index has been created exists.

[0006] Since there is no file index in this abnormal recording file, even if the disk is reproduced, it cannot be reproduced, and valuable photographed data which cannot be obtained again is lost.

Therefore, when the abnormal recording file is recorded on a disk, it is desired to realize a method of restoring the abnormal recording file in a disk recording / reproducing apparatus utilizing the abnormal recording file.

[0008]

According to the present invention, when file data to be recorded on a disc in units of frame data is input from a higher-level device, at least the first frame data of the file is encoded into recording data of a form for recording on the disc. At the time of encoding processing, temporary information different from the original is added to the data index added to the frame data, and a file index of the written file is created when the writing of the file in a predetermined unit to the disc is completed, and thereafter, The temporary information is rewritten to return to the original information, and when the power is turned on, the temporary information is detected, and by detecting this temporary information, the presence of an abnormal recording file having no file index is detected,
When an abnormal recording file exists, a file index of the frame data of the abnormal recording file is created, and thereafter, the temporary information of the abnormal recording file is rewritten to restore the original information to recover the abnormal recording file. .

[0009]

FIG. 1 is a block diagram showing an embodiment of a rewritable disk recording / reproducing apparatus employing a method for restoring an abnormally recorded file according to the present invention.

In FIG. 1, reference numeral 1 denotes an interface for controlling the transfer of data to and from a camera body 3 serving as a higher-level device via a bus 2. Reference numeral 4 denotes a form in which data input from the camera body 3 is encoded and recorded on a disk. And a data processing circuit 5 that decodes the recording data read from the disk and stores data input / output via the interface 1 and is used when the data processing circuit 4 performs data processing. The buffer RAM 6 includes a disk drive unit 7 for driving a disk, and a disk drive unit including a head unit 8 for driving and controlling an optical head for writing and reading data to and from the disk. This is a system control circuit that controls the entire system.

The system control circuit 9 includes a data index generating means 10 for generating a data index added to the frame data at the time of encoding by the data processing circuit 4, and the data index is written each time the writing of each file to the disk is completed. The system includes a file index creation unit 11 for creating a file index of a file, and a buffer control unit 12 for controlling writing and reading of data to and from the buffer RAM 5.

In the disk recording / reproducing apparatus configured as described above, when a disk write request command is input from the camera body 3 to the system control circuit 9 via the interface 1, the system control circuit 9 controls the circuits and mechanisms. The part is controlled to a recording state in which recording is performed on a disc.

In this recording state, the interface 1
The file data of the write request sent from the camera body 3 via the RAM is written into the buffer RAM 5, and the data is added with an error detection code and an error correction code by the data processing circuit 4, and subjected to modulation processing according to the disk medium. Then, a synchronization signal is added to the encoded data and the encoded data is encoded into recording data to be recorded on a disk.

At the time of encoding, a data index including a frame number generated by the data index generating means 10 is added to the recording data for each frame of the file. This frame number is the identification number of the image data shot by the camera body 3, and the order of the frame data for each file is identified.

On the other hand, when recording on a disk, a write position on the disk is searched.

After the write position of the disk is searched, the record data converted by the data processing circuit 4 is sequentially supplied to the disk drive unit 6 in frame units, and the record data is written to the disk via the head unit 8. It is.

Incidentally, the recording of the recording data on the disc is performed according to the processing flow of the flowchart shown in FIG.

That is, when the data is input via the interface 1 and is encoded by the data processing circuit 4, if the data is the first frame data of the file (step a), the special data which is not actually used is set in advance. The data index of the temporary information having the proper frame number is added to the first frame data, and the frame data is recorded on the disk (step b).
On the other hand, the frame data encoded by the data processing circuit 4 successively to the first frame data is sequentially provided with a data index of an original frame number continuous from the next subsequent initial value in frame units, and the frame data is sequentially stored on a disk. It is recorded (step c).

When all the frame data of the file requested to be written is recorded on the disk (step d),
The file index of the file is created by the file index creating means 11, and the file index is written at a predetermined position on the disk (step e).

Thereafter, the head frame data of the written file is searched, the special frame number of the data index of the frame data is returned to the original frame number, the data index is rewritten (step f), and the data is recorded on the disk. Is terminated.

In the state where the recording on the disk has been completed normally in this way, since the disk has a file index corresponding to the actual data of the file, the actual data of the file can be normally reproduced.

Next, the operation of the disk recording / reproducing apparatus shown in FIG. 1 when the power is turned on will be described with reference to the flowchart shown in FIG.

When the power is turned on, the last frame data of the last recording file normally recorded on the disk is searched by referring to the file index (step g). Following the last frame data, the last frame data does not exist in the file index. It is determined whether or not the frame data exists on the disk (step h).

If the existence of the frame data is confirmed, the data index of the frame data is decoded to confirm the frame number (step i).

If the confirmed frame number is a special frame number (step j), it is determined that an abnormality has occurred during the recording (step k), and the recording process of the recording data on the disc is performed according to the determination. The process proceeds to step e of FIG. 2 to decode the data index of the continuous frame data following the frame data of the special frame number, recognize all the frame data having no file index, and recognize the file having no file index. Create a file index corresponding to, and record the file index on the disk.

Thereafter, the data index is rewritten to return the special frame number to the original frame number (step f).

Therefore, even when an abnormal recording file having no file index is recorded on the disk due to the power being cut off during recording on the disk, the file index of the abnormal recording file is created when the power is turned on. The abnormal recording file can be restored, and the photographing data recorded in the abnormal recording file can be reproduced.

[0028]

As described above, according to the present invention, an abnormal recording file having no file index can be restored, and valuable data such as photographed data recorded in the abnormal recording file cannot be obtained again. Can be utilized.

In this case, since the data index is confirmed and the provisional information is detected to detect the abnormal recording file having no file index, it can be easily achieved without providing a special circuit. Since the special frame number is not used, the abnormal recording file can be reliably detected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a rewritable disk recording / reproducing apparatus employing a method for restoring an abnormal recording file according to the present invention.

FIG. 2 is a flowchart showing a recording process of recording data on a disc in the disc recording / reproducing apparatus shown in FIG.

FIG. 3 is a flowchart showing an operation process when the power of the disk recording / reproducing apparatus shown in FIG. 1 is turned on.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Interface 3 Camera body 4 Data processing circuit 5 Buffer RAM 6 Disk drive unit 9 System control circuit 10 Data index generation means 11 File index creation means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/92 H04N 5/92 HF term (Reference) 5C052 AA02 AB04 AB09 AC08 CC01 DD04 5C053 FA23 GB06 GB15 HA29 JA21 KA04 LA01 5D044 AB05 AB07 BC06 CC04 DE02 DE03 DE38 DE48 EF05 FG18 HH17 5D110 AA17 AA26 AA28 DA11 DB02 DC01 DC11 DD13

Claims (3)

[Claims] In a rewritable disc recording / reproducing apparatus for recording a file and a file index on a disc, when file data to be recorded on a disc is input from a higher-level device in units of frame data, at least the first frame data of the file is read. At the time of the encoding process for encoding the recording data to be recorded on the disc, provisional information different from the original is added to the data index added to the frame data, and the data index is written when the writing of the file of the predetermined unit to the disc is completed. Create a file index for the file, and then rewrite the temporary information to return to the original information, detect the temporary information when power is turned on, and detect the temporary information to detect abnormal information without a file index. Detect file existence When an abnormal recording file exists, a file index of the frame data of the abnormal recording file is created, and then the temporary information of the abnormal recording file is rewritten to restore the original information to recover the abnormal recording file. A method for restoring an abnormally recorded file in a disk recording / reproducing apparatus. 2. A method of detecting whether or not recording data exists after the last frame data recognized by a file index, and confirming the data index of the recording data when the presence of the recording data is detected, and 2. The method according to claim 1, wherein information is detected. 3. The abnormal recording file in a disk recording / reproducing apparatus according to claim 1, wherein said temporary information is a special frame number of a frame number included in a data index which is not actually used. Recovery method.