JPH06250909A - File management method - Google Patents

Abstract

PURPOSE:To prevent the disappearance of a file even if the recording of file data is abnormally terminated at the time of updating the file and to set the editing of the file to be efficient. CONSTITUTION:In a file management method recording directory information into the information recording medium of an additional type for respective pieces of file data and managing the file, the directory of the new file is recorded when data of the new file can normally be recorded at the time of updating the file into the new file, and a processing is terminated when data of the new file cannot normally be recorded. At the time of reproducing the file after update, the directory is read from the recording medium and a file name is retrieved. When the directory of the same file name exists, the file is managed by the latest directory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file management method for managing file data recorded on a write-once information recording medium such as an optical card.

[0002]

2. Description of the Related Art Conventionally, as an information recording medium, there are a magnetic recording medium which magnetically records and reproduces information by using magnetism and an optical information recording medium which optically records and reproduces information by using light. Are known. The magnetic recording medium includes a floppy disk and the like, and the optical information recording medium includes an optical disk and an optical card. Such an information recording medium can record a large amount of data and is widely used as an external storage device of a computer.

By the way, as a method of managing a large amount of data on such a recording medium, a block of data is set as one file, and directory information for managing the file is recorded for each file, thereby recording the data. A file management method for managing reproduction is known. Normally, file information such as a file name, file length, and head data track number is written in the directory, and file management is performed based on such information. The above-mentioned optical card, especially the write-once optical card in which data cannot be erased, is about the size of a credit card, but has a storage capacity of several megabytes. Therefore, if it has such a capacity, a directory is still necessary, and in general, file management by a directory is adopted for file management of an optical card.

FIG. 5 shows the recording surface of the optical card. Reference numeral 1 is an optical card, 10 is a data section consisting of a plurality of tracks for recording file data, and 20 is a directory for recording directory information. It is a department. Further, 10 ₁ to 10 _n are data tracks, which are recording units of data, and 20 _{1 to} 20 _m are directories recorded in the directory section 20. Here, the case of recording the file data on the optical card 1 file data to the data portion 10 from the first track 10 ₁ of the upper of the optical card 1 in the direction E is written, whereas the directory optical card 1
Is written in the F direction from the lower part of. File data is 1
It consists of one or more tracks, and a directory is written corresponding to each such file data. By the way, when managing files, it is necessary to delete unnecessary files, but since write-once media such as optical cards cannot be rewritten, it cannot be deleted even when files are no longer needed. was there.

Then, as a method for solving such a problem, there is a directory forming method proposed in Japanese Patent Laid-Open No. 63-91888, for example. This method is a method of logically erasing a file by recording a directory for erasing the file. In this method, the file can be updated by using the erase directory.

An example of the above file updating method will be described with reference to FIGS. 6 and 7. First, FIG. 6 is a flowchart showing the file update process. First, in order to erase the old file before update, the erase directory of the old file directory is recorded in the directory portion of the optical card (S1). Next, the updated data of the new file is recorded (S2), and it is determined whether or not an abnormality has occurred during the recording of the data of this new file (S3). if,
If an error occurs, the process ends. If it can be recorded normally, the directory of the new file is recorded and the process ends (S
4).

FIG. 7 shows the directory and data of the optical card. FIG. 7 (a) shows a state before updating the file A, and FIG. 7 (b) shows a state after completing the update of the file A normally.
FIG. 7C shows a state after the update of the file A ends abnormally. Further, 201 to 205 in the figure are directories,
Reference numerals 301 to 304 indicate file data, A, B and C indicate file names, and D in parentheses indicates that the directory is an erasing directory. Furthermore, the arrow points to the file data managed by the directory, and for example, the directory 201 represents that the file data 301 is managed by the file name A.

Here, when the file A of FIG. 7A is updated according to the process of FIG. 6, the erase directory 204 of the old file A is first recorded as shown in FIG. 7B. The erase directory 204 is shown as A (D) as described above. Next, data 304 of new file A
Is recorded, and if recorded normally, the directory 205 of the new file A is recorded. When reproducing the updated data as shown in FIG. 7B, the directories 201 to 205 are first read and transferred to the host computer. After temporarily storing each directory in the memory in the host computer, the erasure directory is searched from those directories and the directory 201 designated by the erasure directory is removed. That is, the erasure directory 204 removes the unnecessary directory 201, and the remaining directories 202, 203, and 205 perform file management. Therefore, the old file A
Data 301 of the new file A is deleted by the directory 205.
It is managed as 04. In this way, the file A is updated normally.

[0009]

By the way, FIG.
As described above, (c) shows the state after the update of the file A ends abnormally. However, when the data at the time of such abnormal end is reproduced, the file A to be updated is logically updated. There was a problem that it would be erased. More specifically, first, in FIG. 7C, since the recording of the new file is abnormal, the data of the new file A is not recorded and the erase directory 204 of the old file A is recorded. All directories 2 in this state
When 01 to 204 are read out and the directory 201 designated by the erase directory 204 is removed from them,
The remaining directories are 202 and 203. Therefore, there is no directory for managing the file A, and the file A is deleted. As described above, the conventional file updating method has a problem that the new file cannot be normally recorded, and when the new file is abnormally terminated, the old file is erased and cannot be accessed.

The present invention has been made to solve such a problem, and even if the recording of the file data is abnormally terminated at the time of updating the file, it is possible to prevent the file from being lost and to edit the file. The purpose of the present invention is to provide a file management method for improving efficiency.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to update a file to a new file in a file management method for managing file by recording directory information for each file data on a write-once information recording medium. In this case, when the data of the new file can be recorded normally, the directory of the new file is recorded, and when the data of the new file cannot be recorded normally, the processing is terminated.
When playing the updated file, the directory is read from the recording medium to search for the file name, and if there is a directory with the same file name, the file is managed by the newest directory. Achieved by management methods.

It is another object of the present invention to manage a file by recording directory information for each file data on a write-once type information recording medium and updating the file to a new file. When the data of the new file can be recorded normally, the erase directory indicating the deletion of the directory of the old file and the directory of the new file are recorded respectively, and when the data of the new file cannot be recorded normally, the processing ends. Then, when playing the updated file, the directory is read from the recording medium to find an erase directory, and if there is an erase directory, the directory of the old file designated by the erase directory is removed and the remaining directory is removed. It is characterized by managing files by It is achieved by a file management method.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a flow chart showing an embodiment of a file update process based on the file management method of the present invention. In FIG. 1, when updating a file, first, the data of the new file is recorded on the optical card (S
1). Here, it is judged whether or not an abnormality has occurred during the recording of the data (S2), and if the abnormality occurs and the data cannot be normally recorded, the processing is abnormally terminated. On the other hand, if the data can be normally recorded, the directory of the new file is recorded and the processing is normally terminated (S3). In this way, the file updating process of the optical card is completed.

FIG. 2 is a diagram showing the recorded contents of the optical card.
2A shows the contents of the file before updating, and FIG. 2B shows the contents after updating the file. Further, FIG. 2C is a diagram showing the recorded contents when an abnormality occurs during the data recording of the file and the processing is abnormally terminated. Before the file update, as shown in FIG. 2A, three file data 301 to 301
03 is recorded, and directories 201 to 203 for managing it are recorded. In addition, A, B, C
Indicates a file name, and an arrow indicates file data managed by the directory. For example, the directory 201 indicates that the file data 301 is managed by the file name A. If the file A is updated according to the process shown in FIG. 1 in this state, the data 304 of the new file A is first recorded as shown in FIG. 2B, and if the data 304 can be normally recorded, the new file A is recorded. The directory 204 is recorded. On the other hand, if an error occurs during the data recording of the new file A and the data cannot be normally recorded, as shown in FIG. 2C, the data 304 is abnormally terminated during recording. Therefore, the process ends with the directory of the new file left unrecorded.

Next, the processing for reproducing the data of the normally updated optical card as shown in FIG. 2B will be described. When reproducing data, the information recording / reproducing apparatus reproduces all the directories 201 to 204 of the optical card and transfers them to the host computer which is the host controller. After writing the directory to the memory, the host computer searches for the file name of the directory, and when there is a directory with the same file name, the directory other than the newest directory is removed. In the example of FIG. 2B, the directories 201 and 20
4 has the file name A, the old directory 201 is removed and the newest directory 20
4 is left. Therefore, in the host computer, files 302, 303, 304 are managed by the directories 202, 203, and 204, respectively.
As described above, the data of the file A is stored in the directory 204
Then, the data 304 is obtained, and the file A is updated normally.

On the other hand, when reproducing the data of the optical card which is not normally updated as shown in FIG. 2C, all the directories 201 to 203 are reproduced by the information recording / reproducing apparatus in the same manner as described above. Transferred to the host computer. The host computer searches for the file name of the directory to see if there is a directory with the same file name. In the example of FIG. 2 (c), the directory of the new file is unrecorded, so the same file name exists. do not do. Therefore, directories 201-20
File management is carried out by 3. As described above, the data of the file A is data 3 by the directory 201.
01, the file A is not updated, but the file A before update is not lost and the old file A can be accessed.

In the present embodiment, when updating the file of the optical card, if the data of the new file can be normally recorded, the directory of the new file is recorded, and when there is a directory with the same file name when the data is reproduced, By performing file management in the directory recorded most recently, the old file can be substantially deleted and the file can be updated normally. Also, if the data of the new file cannot be recorded normally, the directory of the new file is not recorded and the process ends abnormally, so there is no directory with the same file name when playing the data.
The file to be updated can be managed in the previous directory. In other words, although the file cannot be updated, the old file can be managed in the old directory, and the problem that the old file is lost when an error occurs in the data recording of the new file as in the past is solved. be able to. Therefore, even if the new file cannot be recorded normally, the old file can be accessed. For example, when editing the file and saving the edited file, it is necessary to create a new file due to the loss of the file. Therefore, the efficiency of file editing can be improved. In addition, since it is not necessary to write an erase directory when updating a file, the time required for updating the file can be shortened accordingly.

Next, another embodiment of the present invention will be described. FIG. 3 is a flowchart showing another example of the file updating process based on the present invention. In this embodiment, when the file is updated, the data of the new file is first recorded on the optical card (S1). Next, it is judged whether or not an abnormality has occurred in the data recording (S2), and if the abnormality occurs and normal recording cannot be performed, the processing is abnormally terminated. On the other hand, if the data can be normally recorded, the erase directory indicating the erasure of the old file directory is recorded (S3), the new file directory is recorded (S4), and the process ends normally.

FIG. 4 is a diagram showing the recorded contents of the optical card.
FIG. 4A is a diagram showing recorded contents before the file is updated, and FIG. 4B is a diagram showing recorded contents after the file is updated. Further, FIG. 4C is a diagram showing the recorded contents when an abnormality occurs during the recording of file data and the processing is abnormally terminated. Before updating the file, as shown in FIG. 4A, the file data 301 to 303 and the directory 201 for managing the file data
~ 203 are recorded. A, B, and C are file names, respectively. If the file A is updated according to FIG. 3 in this state, the data 304 of the new file A is first recorded as shown in FIG. 4B. If the data 304 can be normally recorded, the erase directory 2 of the old file A is recorded.
04, the directory 205 of the new file A is recorded. On the other hand, if an abnormality occurs during the recording of the data 304 of the new file A and the data 304 cannot be recorded normally, the processing ends abnormally during the recording of the data 304 as shown in FIG. 4C.

Here, in the case of reproducing the data of the optical card for which the file update is normally completed as shown in FIG. 4B, first, the information recording / reproducing apparatus reproduces all the directories 201 to 205, and the host computer Transferred to. After storing each directory in the memory, the host computer searches the directory for an erase directory and removes the directory designated by the erase directory. In this example, the deletion directory 204
Is searched for, and the directory 201 of the old file A indicated by that is deleted. As a result, the directories are only 202, 203 and 205, and the files are managed by these directories thereafter.
Therefore, the data of the file A becomes the data 304 by the directory 205, and the file A is updated normally.

On the other hand, in the case of reproducing the data of the optical card in which the updating of the file is abnormally terminated as shown in FIG. 4C, all directories are similarly reproduced and transferred to the host computer. The host computer searches the directory for an erase directory, but if an error occurs in recording data, the process ends without recording the erase directory or the new file directory.
There is no deletion directory, the directory is 201,
Only 202 and 203 are available. Therefore, the data of the file A becomes the data 301 by the directory 201,
The file A is not updated, but the old file A before the update is not erased.

In this embodiment, when the data of the new file can be normally recorded, the erase directory of the directory of the old file and the directory of the new file are recorded, and the old file specified by the erase directory is reproduced when the data is reproduced. By removing the directory, the data of the new file can be managed by the directory of the new file, and the file can be updated normally. Also, if the data of the new file could not be recorded normally, it will not be deleted because the erase directory will not exist when the data is played back by abnormally ending. Old files can be managed by the file directory. Therefore, even if an abnormality occurs in data recording, the old file is not lost, and the efficiency of file editing can be improved as in the above embodiment.

[0023]

As described above, the present invention can prevent the loss of a file even if the recording of the file data ends abnormally when the file is updated, and as a result, the data recording becomes abnormal when the file is edited. Even if the error occurs, the file is not lost and the old file can be accessed. Therefore, there is an effect that the file can be efficiently edited.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of a file updating method according to the present invention.

FIG. 2 shows the recorded contents of the optical card when the file is updated by the method of FIG. 1 before the file is updated and after it is normally updated.
6A and 6B are diagrams respectively showing a case where the update is not normally performed.

FIG. 3 is a flowchart showing another embodiment of the file updating method according to the present invention.

FIG. 4 shows the recorded contents of the optical card when the file is updated by the method of FIG. 3 before the file is updated and after it is normally updated.
6A and 6B are diagrams respectively showing a case where the update is not normally performed.

FIG. 5 is a diagram showing an arrangement of a data section and a directory section in a recording area of a general optical card.

FIG. 6 is a flowchart showing a conventional method of updating a file of an optical card.

FIG. 7 shows the recorded contents of the optical card when the file is updated by the method of FIG. 6 before the file is updated and after it is normally updated.
6A and 6B are diagrams respectively showing a case where the update is not normally performed.

[Explanation of symbols]

1 the optical card 10 data portion 20 directory unit 10 ₁ to 10 _n data tracks 20 ₁ to 20 _m directory 201-205 directories 301-304 file data

Claims (2)

[Claims] 1. In a file management method for managing a file by recording directory information for each file data on a write-once type information recording medium, when the file is updated to a new file, the data of the new file is normal. When the data of the new file is recorded, the directory of the new file is recorded, and when the data of the new file is not normally recorded, the process is terminated, and when the updated file is reproduced, the directory is recorded from the recording medium. A file management method that reads and searches for a file name, and when a directory with the same file name is found, the file is managed by the newest directory. 2. A file management method for managing a file by recording directory information for each file data on a write-once type information recording medium, and when the file is updated to a new file, the data of the new file is normal. If it is possible to record in the file, the erase directory indicating the deletion of the old file directory and the directory of the new file are recorded respectively, and if the data of the new file cannot be recorded normally, the processing is terminated and the updated file When reproducing, the directory is read from the recording medium to search for an erase directory, and when there is an erase directory, the directory of the old file designated by the erase directory is removed and the files are managed by the remaining directories. File management method characterized by.