JP3039677B2 - File management method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a file management method for an information recording / reproducing apparatus for recording and / or reproducing information on an information recording medium.

[Conventional technology]

A directory is used as a file management method for handling a large number of files on floppy disks, magnetic hard disks, magneto-optical disks, IC cards, and the like.

This is used as a file heading, and includes a file name, a creation date, a writing position (a head track number) of the corresponding file, and the like. When you create a new file, create a new directory,
When an unnecessary file is generated, the corresponding directory is deleted, so that the file can be easily managed.

In a system using an erasable / rewritable information recording medium such as the above-mentioned magnetic / magneto-optical recording medium or IC card, information can be easily erased / rewritten.

In this case, the erased file is physically present even if it is logically erased while the area where the file existed is kept empty.

However, when a part or all of the area is used by recording another file, the logically deleted file is also physically deleted.

Basically, there is no concept of storing and managing deleted files one by one in a system using the information recording medium.

On the other hand, a write-once type information recording medium which has begun to be used in recent years, for example, an optical card, is small and lightweight, is convenient to carry, and has a great demand as a recording medium for managing personal information possessed by individuals because of its relatively large capacity and low cost. Expected.

A file management method in a system using such an optical card as an information recording medium is greatly different from a file management method in a system using the magnetic recording medium or the like.

First, the structure of the optical card and the principle of recording / reproducing information will be described.

FIG. 6 (a) is a schematic plan view showing an example of the optical card, and FIG. 6 (b) is a BB cross-sectional view thereof.

In these figures, reference numeral 1 denotes an optical card, and the surface of the optical card is roughly divided into an information recording area 51 and a blank area 52 other than the information recording area 51. An appropriate logo 50 can be attached to the margin area so that the user can visually determine the type, use, and the like of the optical card. In the information recording area 51, a plurality of tracking tracks 54 pre-formatted for automatic tracking are arranged in parallel. An information track in which information is recorded between adjacent tracking tracks.
It is 55.

As shown in FIG. 6B, the optical card 1 has a plurality of layers. 56 is a transparent protective layer, and 57 is a recording layer.
The recording layer is, for example, of a silver salt type, a dye type or a chalcogen type. The boundary between the transparent protective layer 56 and the recording layer 5 is formed in a stepped shape, thereby forming the tracking track 54 and the information track 55. Reference numeral 59 denotes a substrate, and the substrate and the recording layer 57 form an adhesive layer.
It is joined by 58.

Such recording of information on the optical card 1 is performed by modulating a light beam narrowed in a minute spot shape in accordance with the recording information, and further scanning the information track 55, whereby an optically detectable information bit sequence is provided. Is recorded as information.

Since this information bit sequence is formed by physical change such as deformation or discoloration by light and heat, the information bit sequence once recorded is physically erased, and the erased information bit sequence area is used as a recording area again. Is impossible.

Further, in reproducing information from a recording medium, the information bit train of the information track is scanned with a light beam spot having a constant power so that recording is not performed on the medium, and reflected light or transmitted light from the medium is detected. It is done by doing.

Next, file management in a system using an optical card as an information recording medium will be described.

When recording a set of information, the optical card records two pieces of information: a data file of the information and a directory for managing the data file.

At this time, the directory and the data file are recorded in separate recording areas in the information recording area 51 of FIG. 6A, thereby facilitating file management.

Further, recording of further information is sequentially performed on an unrecorded area next to the already recorded data file or directory.

 Next, erasure of a file will be described.

Unnecessary files can be erased logically by newly recording information in which information indicating that the files have been deleted is added to the information of the directory that manages the files, and by not reading the corresponding files on the system. File is being erased.

In a system using an optical card as an information recording medium, file management is performed as described above.

[Problems to be solved by the invention]

In recent years, personal information has been managed using various recording media. The fields of use are diverse and, for example, medical information management, insurance information management, parts management or ID, application to prepaid cards, etc., are expected to further develop in the future.

However, in such a personal information management system, erroneous erasure and destruction of recorded information, and manipulation and forgery of information by others become the biggest problems, and in many cases, the problems may develop to human rights.

In order to deal with such problems, magnetic and magneto-optical recording media or IC cards are not suitable as personal information management recording media because files are physically erased. You can say.

An optical card is the most suitable recording medium for personal information management because recorded information is not physically erased.However, in a conventional system using an optical card, a magnetic or magneto-optical recording medium or Since the same file management method as the system using IC card is used,
Once logically erased information cannot be reproduced again.

This means that the maximum feature of the optical card that recorded information is logically erased but not physically erased is not fully utilized.

Therefore, the present inventors have proposed a file management method in an information recording / reproducing apparatus capable of reproducing logically erased information again.

In this file management method, a directory containing erasure information and another directory are identified, information that is logically erased is called using the directory containing the identified erasure information, and reproduction is performed. .

However, this file management method also has the following problems. For example, when one piece of information is erased many times, there are a plurality of erase directories having the same file name, and it is not possible to know which erase directory corresponds to the information to be reproduced or reproduced. Has to be checked one by one, and there is a problem that the search takes time.

[Means (and action) for solving the problem]

The present invention has been made in view of the above problems, and provides a file management method of an information recording / reproducing apparatus that enables information that has been logically erased to be reproduced again and that does not require a search time for the reproduction. The purpose is to do.

An object of the present invention is to provide a file management method for an information recording / reproducing apparatus for managing a recording data file by recording directory information for managing the recording data file in a directory area provided on an information recording medium. In order to logically erase the data file, a step of recording a serial number indicating an erasure state and an erasing order in the directory area with respect to the recording data file to be erased, and Displaying only the file names corresponding to the logically erased recording data files in the order of erasure using the serial number for replaying, and selecting the logically erased logical data by selecting a display file name. Reproducing the recorded data file. It is achieved me.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A case in which the present invention is used for an optical card as an example of a directory reform will be described.

First, a configuration example of an information recording / reproducing apparatus used for forming a directory according to the present invention will be described.

FIG. 2 is a schematic diagram of one configuration example of an information recording / reproducing apparatus used in the present invention.

An information recording / reproducing device (hereinafter, referred to as a drive) 31 is connected to a higher-level control device (hereinafter, referred to as a host) 32, and performs data communication and control between the drive 31 and the host 32. The MPU 33 in the drive 31 has a built-in ROM and RAM, and mainly controls a card feed motor 37 and a head feed motor 36, and an AT / AF control circuit 34 receives a signal from a photodetector 39 to perform an AF.
The actuator 40 and the AT actuator 41 are driven. The modulation / demodulation circuit 35 performs recording by changing the light emission intensity of the light source 38 during recording, and demodulates data based on the signal of the photodetector 39 during reproduction. Host 32 is drive
It transmits and receives data to and from the optical card 1 and controls the recording and reproducing operations of information in the directory section and the data section on the optical card 1.

 FIG. 1 is a diagram showing a file management method of the present invention.

In the figure, 21 to 30 are directory parts, 21a and 22a and 21a1 to 21a3 and 22al are data parts.

Of the directory parts 21 to 30, 23, 25, 27, and 29 indicate erasure directories, and the others indicate directories.

The directory and the erasure directory are the same format, and the format is composed of a directory serial number section 101, an erasure information section 102, a file name section 103, and other information sections 104. Here, at least one bit or more is assigned to the erasure information section 102.

If the directory is an erasure directory, a number other than 0 is recorded in the erasure information section 102, and a serial number of many bytes indicating the number of the established erasure directory in the optical card is recorded. If the directory is not an erasure directory, "0" is recorded in the erasure information section 102.

In this embodiment, if the erasure information is a numerical value other than 0, the directory is determined to be an erasure directory, and the file managed by the erasure directory belongs to a logically erased file group managed in (erase mode). Also, files managed by a directory whose erasure information is 0 belong to a logically existing file group managed in (normal mode). However, since the directories 21, 24, 26 and 22 are already the directories to be erased, even if the erasure information is 0 (normal mode).
It does not belong to the file group managed by.

FIG. 3 is a flowchart for recording information in the file management method of the present invention.

FIG. 4 is a flowchart for reproducing information in the file management method of the present invention.

Hereinafter, a file management method using the directory format will be specifically described with reference to FIGS. 1, 3, and 4. FIG.

In FIG. 1, it is assumed that the contents of the file 1 managed by the directory 1 of the directory serial No. 1 are corrected and recorded again on the optical card with the same file name.

In FIG. 1 and FIG. 3, information indicating that the file 1 is to be rewritten with the same file name as the corrected data file 1 of the file 1 is sent from the host 32 to the MPU 33. In step 200, it is determined that the file is to be erased, the erase information section is set to 1 in the erase directory format 201, and it is determined in step 203 that the file is to be rewritten with the same file name. Then, the erasure directory 1 is recorded in the directory section 23.
Here, the contents of the file name section 103 and other information sections 104 of the erasure directory 1 are the same as the contents of the directory 1. Here, the file 1 is the first file erased in this optical card.

Then, the MPU 33 confirms that the erasure directory 1 has been recorded in the directory section 23, and determines again at step 200 whether or not the file is to be erased. In this case, the correction data file 1 and the directory serial that manages it
Since it is the recording of the directory 1 of No. 4, the correction data file 1 is first recorded as the file 1 in the file portion. Next, the directory 1 of the directory serial No. 4 is recorded in the directory section 24 with the erasure information section set to 0.

As a result, the file 1 managed by the file group in the (normal mode) is managed by the file group in the (erasing mode) because the erasing directory 1 of the directory serial No. 3 is determined. The file 1 managed by the directory serial No. 4 is managed by a file group of (normal mode).

In FIG. 1, the files are deleted by directories Nos. 5, 7, and 9, and the recording of each correction data file and its management directory is managed by the same processing as the file management described above. However, the erasure information recorded in the erasure directories of directory serial Nos. 5, 7, and 9 are 2, 3, and 4, respectively, as shown in FIG.

The erasure information of the erasure directory in this embodiment is a serial number indicating the order in which the erasure directory of the optical card is recorded. Each time an erasure directory is added, one serial number is used as the erasure information. It is getting bigger and bigger. The number of existing erasure directories is determined by detecting the erasure information in the last erasure directory by reading the directory performed when the optical card is inserted into the information recording / reproducing apparatus.

By the way, the case where the file is corrected and the file is recorded again with the same file name has been described above.However, when only the existing file is to be deleted, the flowchart and step 203 determine NO, and only the deleted directory is deleted. It will be written on the optical card.

Next, a method of reproducing information recorded on an optical card will be described with reference to FIGS.

Data portions 21a, 22a and 21a1, 21 recorded on the optical card
The files a2, 22a1, and 21a3 and the directory for managing the files or the erasure directory are sent to the MPU 33 by the reproducing operation of the information recording / reproducing apparatus in accordance with an instruction from the host 32. The MPU 33 determines in step 300 whether or not the erasure information portion of each directory or erasure directory has erasure information $ 0. Directory serial No. whose erasure information part is not 0
The files managed by the erasure directories 3, 5, 7, and 9 are stored in the (erase mode) area of the host 32.

The directory serial N whose erasure information part is 0
o. Files managed in directories 8 and 10 are stored in the (normal mode) area of the host 32. That is, in step 300, it is determined whether the reproduced information has been deleted in the past or not, and the information is sorted.

Also, each file group stored in the host 32 for each mode, by selecting each mode,
It is possible to display the file name on the display 301 as shown in FIG.

If (erase mode) is selected at this time, the file name and the serial number, which is the erasure information, are displayed simultaneously in ascending order of the serial number. Thus, the history of the erased file can be determined. When (normal mode) is selected, the display is performed in the reading order from the optical card.

Of course, in both modes, it is also possible to view the contents of each file by selecting the file name.

As described above, according to the present invention, a logically existing file and a logically erased file can be managed as separate file groups, and usually, while file management is performed with a logically existing file group, By selecting (erase mode), it is possible to search for a file group logically erased in the past in accordance with the serial number which is the erase information of each erase directory.

In the first embodiment, the erasure information section of each directory
Although a numerical value of 0 is recorded in 102, it is needless to say that the same effect as in the first embodiment can be obtained even if nothing is recorded and blank.

As shown in FIG. 5, the same effect as in the first embodiment can be obtained by independently managing the serial numbers corresponding to the erasure information of the erasure directory for each file having the same file name. In addition, the function of retrieving a logically deleted file can be further improved.

Further, when the erasure directory reaches a predetermined number, the erasure directory may be collectively recorded in a predetermined number unit and collectively recorded in a specific area (not shown) on the optical card.

The management of the erasure directory is performed only for a predetermined number. For example, when five times are set to the predetermined number, when seven erasure updates are performed, only five erasure directories from the latest erasure history are displayed. Such a configuration is also conceivable.

According to these, the same effects as those of the first embodiment can be obtained, and the function of the file management can be improved.

〔The invention's effect〕

As described in detail above, according to the file management method of the present invention, when a file is logically erased, information indicating the serial number of the erase information is added to the erase information recorded in the directory, and the erase is performed. By using the information and the serial number of the erasure information, it is possible to quickly retrieve and reproduce a file that has been logically deleted in the past to be reproduced.

This not only enables file management that makes full use of the characteristics of the write-once type information recording medium, but also prevents the recorded information from being forged by another person or logically deleting the recorded information by mistake. Information can be reproduced.

As a result, highly reliable file management suitable for managing personal information can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a file management method of the present invention. FIG. 2 is a schematic diagram of one configuration example of an information recording / reproducing apparatus used in the present invention. FIG. 3 is a flowchart for recording information in the file management method of the present invention. FIG. 4 is a flowchart for reproducing information in the file management method of the present invention. FIG. 5 is a diagram showing another file management method of the present invention. 6 (a) and 6 (b) are a schematic plan view showing an example of an optical card and a sectional view thereof. 1 optical card 21-30 directory part 21a, 22a and 21a1-21a3, 22a1 data part 31 drive 32 host 33 MPU 101-104 contents of directory format 301 display Department

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI G11B 27/00 G06K 19/00 C (58) Fields investigated (Int.Cl. ⁷ , DB name) G06F 12/00 G06K 17 / 00 G06K 19/00 G11B 27/00

Claims (1)

(57) [Claims] 1. A file management method for an information recording / reproducing apparatus for managing a recording data file by recording directory information for managing the recording data file in a directory area provided on an information recording medium,
Recording a serial number indicating an erasure state and an erasure order in the directory area for the recording data file to be erased in order to logically erase the recording data file; Displaying only the file names corresponding to the logically erased recording data files in the order of erasure using the serial number in order to reproduce the data again; and selecting the display file name to logically erase the file. And reproducing the recorded data file.