JPH04357538A - File management method - Google Patents

Abstract

PURPOSE:To change the file name in a short time with a small quantity of additional recording by adding a first directory to show that a directory itself is the directory to show the change of the file name and a second directory including the file name after the change. CONSTITUTION:When a file name A is changed, a directory to show the change of the file name is recorded in a directory part 306. A new file name is recorded in a directory part 307. That is, information (R) to show that the directory itself is the directory to show the change of the file name, information (N) to show that as the directory to show the file name of a file to be changed, the directory itself is the directory to show the new, that is, file name after the change, and a file name D after the change are recorded. By recording the directory to show the change of the file name like this, the file name of the purpose file is changed to the desired file name.

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 information recorded on an information recording medium such as an optical disk or an optical card.

0002

[Prior Art] Conventionally, information recording media include floppy disks and magnetic hard disks that record and reproduce data using magnetism, and card-shaped optical information recording media (hereinafter referred to as optical cards) that record and reproduce data using light. (hereinafter referred to as optical disks) and disk-shaped optical information recording media (hereinafter referred to as optical disks) are known. In order to store large amounts of data, these information recording media use auxiliary data, so-called directories, for managing data block by block. Directories typically include filenames,
It writes file information such as file length and first data track number, and performs file management of the data section. The above-mentioned optical cards, especially non-erasable write-once optical cards, have a large storage capacity even though they are about the size of a credit card. In order to manage such a large amount of information, an information management method using a directory is required.

FIG. 10 is a schematic plan view showing an example of the optical card. The optical card 1 has a data recording area 10,
It has a directory recording area 20. In the data recording area 10, a plurality of data are recorded on a data track 101.
, 102 , ..., 10n. On the other hand, in the directory recording area 20, a plurality of directories for managing the plurality of data described above are stored in the sector 201.
, 202 , 203 , ..., 20n. Data is sequentially additionally recorded in the unrecorded portion of the data recording area 10 in the E direction following the already recorded data. On the other hand, directories are sequentially additionally recorded in the unrecorded portion of the directory recording area 20 in the D direction following the already recorded directories. A series of data is collectively handled as a file, and a directory is assigned to each file. The normal directory is
Contains address information such as the file name and first track number of the corresponding data.

[0004] When managing a large amount of data as described above, it is desirable to delete files that are no longer needed in order to be able to easily search for a desired file. However, in write-once type recording media such as ordinary optical cards, data once recorded in this way cannot be physically erased.

[0005] Therefore, a method of logically deleting unnecessary data using a directory is proposed in Japanese Patent Laid-Open No. 63-69072.
This method has been proposed in Japanese Patent Laid-Open No. 63-91888. This method will be explained below using FIG. 11. In FIG. 11, 21 to 25 are directory parts, 21a to 25 are directory parts, and 21a to 25 are directory parts.
24a is a data section. Directories 1 to 4 of directory sections 21 to 24 include data sections 21a to 2, respectively.
Directory information for files 1 to 4 of 4a is written. Now, assuming that the file 3 is no longer needed, a deletion directory 3 indicating that the file 3 is no longer needed is written in the directory section 25. The deletion directory 3 has written therein information that the directory itself is an deletion directory and information as to which directory contains the file to be deleted. In this case, information on directory 3 is written as the directory of the file to be deleted, and this means that file 3 has been logically deleted. In addition, when reproducing the optical card, the directory sections 21 to 25 are reproduced by the information recording and reproducing device, and the directories of the directory section are stored in the memory in the host computer connected to the information recording and reproducing device or in the auxiliary storage device. All or a necessary part of the information, here the directory information of the directory sections 21 to 25, is read. Next, the host computer removes directory 3 indicated by erased directory 3 from the read directory information and reads directories 1, 2, and 4. From now on, this directory 1,
Use 2 and 4 to manage files.

According to the above method, by providing a new deletion directory in the directory section for files that cannot actually be deleted, it becomes possible to treat the files as if they were deleted. Furthermore, by using the above deletion directory, it becomes possible to update the data of any file and change the file name. When updating data, after recording the erase directory, the updated data and file name may be the same, and a directory indicating the address information of the updated data may be recorded. When changing the file name, after recording the erased directory, it is sufficient to record a new directory with a different file name and the same address information such as the leading data track number. This can also be applied when changing the attributes of a file.

On the other hand, Japanese Patent Laid-Open No. 1-258288 proposes a method of appending data to an arbitrary file. This method provides a flag (append flag) indicating addition of file data in directory information. Here, when data is added to a file, the data to be added is recorded as a separate file. Then, add an additional data file (
Increment the append flag and record the directory that manages the partial file. As a result, files with the same file name but different append flags are
It is handled as one file divided and recorded in the order of the append flag numbers.

[0008]

[Problem to be Solved by the Invention] When changing the file name of a file that has been divided into multiple partial files as described above, first record the deletion directory, and then add the directory containing the new file name to each partial file. It is necessary to record the number corresponding to the file. By the way, optical cards are the same size as credit cards and are convenient to carry around, so there are high expectations for their applications in adding data, such as recording daily blood pressure measurements. If an attempt is made to change the file name of an optical card used in such an application using the method described above, it may be necessary to record tens to hundreds of directories. In this case, there is a problem that not only does it take a lot of time to change the file name, but also that the data recording capacity decreases as many directories are recorded.

An object of the present invention is to provide a file management method that allows changing the file name of a directory in a short time with a small amount of additional recording.

0010

[Means for Solving the Problems] In order to achieve the above object, in a file management method for managing file information recorded on an information recording medium using directory information, the directory itself is provided with a file name in the directory section of the recording medium. A file management method characterized by additionally recording information indicating that the directory is a change in a directory, a first directory including a file name to be changed, and a second directory including a file name after the change. provided.

[0011]

[Operation] According to the present invention, in the directory section of the recording medium, information indicating that the directory itself is a directory indicating a file name change, and a first directory containing the file name to be changed and the file after the change are provided. By additionally recording a second directory containing the name
This allows file names to be changed with a small number of directory recordings, in a short time, and even on media that cannot be erased or rewritten.

0012

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 is a block diagram showing an example of the configuration of an information recording/reproducing apparatus that executes the method of the present invention. This device records and reproduces information on an optical card 1 as shown in FIG.

In FIG. 3, a drive 31 is connected to a host computer 32, and data and recording/reproduction command signals are exchanged between them. Recording/reproduction on the optical card 1 is performed by the optical head 43. Inside the optical head 43, there is a light source 38 consisting of a laser diode or the like that irradiates a light beam onto the optical card 1, and a photodetector 39 that detects the light beam reflected by the optical card 1.
is provided. The light beam emitted from the light source 38 is focused onto the optical card by an objective lens (not shown). The objective lens is moved in the optical axis direction of the light beam and in the direction perpendicular to the optical axis by an autofocusing (AT) actuator 40 and an autotracking (AT) actuator 41 built into the optical head 43, respectively. The AT/AF control circuit 34 detects a focusing error signal and a tracking error signal from the output of the photodetector 39 using a well-known method. And A.T.
/AF control circuit 34 controls AF actuator 40 and AT actuator 4 according to these error signals.
1 to perform AF servo and AT servo. The optical card 1 is reciprocated by the card feed motor 37 in the directions indicated by arrows L and F parallel to the longitudinal direction of the track shown in FIG. Further, the optical head 43 is moved in a direction across the track as indicated by Y by the head drive motor 36.

Microprocessing unit (MPU)
) 33 inputs information sent from the host computer 32 to the modem circuit 35 when recording information. The modem circuit 35 sends a signal to the light source 38 according to the input information.
modulates the light beam emitted from the Card feed motor 37
The track of the optical card 1, which is being moved back and forth by the optical card 1, is scanned by this modulated light beam, and information is recorded. When reproducing information, the light source 38 emits a light beam of constant intensity, and the track on which information is recorded is scanned with this light beam. Then, the reflected light that has been modulated according to the recorded information is received by the photodetector 39. Photodetector 39
The output is sent to the modem circuit 35, and the signal is demodulated. The demodulated signal is sent to the host computer 32 through the MPU 33. Directory information recorded in the directory recording area of the optical card 1 is stored in the memory 42 . The MPU 33 controls the head drive motor 36 based on the directory information stored in the memory 42 to cause the optical head 43 to access a desired track.

Next, the recording/reproducing process using the above device will be explained. When recording a certain file, first
The PU 33 causes the optical head 43 to access the unrecorded portion of the data recording area 10 of the optical card 1 in accordance with a recording command from the host computer 32 . Next, the data sent from the host computer 32 is transferred to the modem circuit 35.
The modulated light beam is emitted from the light source 38. Then, while the optical card 1 is reciprocated by the card feed motor 37, the track is scanned with a modulated light beam to record a series of data (files). Next, M.P.
U33 causes the optical head 43 to access the unrecorded portion of the directory recording area 20 of the optical card. Then, similarly to data recording, by scanning the optical card with a modulated light beam, a directory corresponding to the file recorded in the data recording area is written in this directory recording area. Here, the directory to be written includes the file name of the above-mentioned file input from the host computer 32 and address information indicating the position in the data recording area 10 where this file is recorded. Each time a file is recorded, the above operation is repeated, and a plurality of files and a plurality of directories corresponding to the files are recorded on the optical card 1.

[0016] When searching for files recorded as described above and reproducing data, the MPU 33 first performs the following steps.
The optical head 43 is connected to the directory recording area 20 of the optical card 1.
access. Then, the optical head 43 reads out all the directories recorded in this area and stores them in the memory 42. The file names of the directory stored in the memory 42 are sent to the host computer 32 through the MPU 33, and a list of these file names is displayed on a display element (not shown) of the host computer 32. The user uses a keyboard (not shown) to instruct reproduction of a desired file based on the displayed file name. When a reproduction instruction is input from the host computer 32, the MPU 33 reads address information of the specified file from a directory stored in the memory 42. Then, the optical head 43 is caused to access the position in the data storage area indicated by the read address information. The optical head 43 reads the recorded data by the above-described reproduction operation, and sends the data to the host computer 32 via the modem circuit 35 and MPU 33.

Next, a method of the present invention for changing a file name using the above-mentioned apparatus will be explained with reference to FIGS. 1 and 2. 1 and 2 are diagrams schematically showing the state of information recorded on a medium, and the description within each frame indicates the content of the information. Figure 1 shows the state before file name change, 301 to 305
is a directory section, and 301a to 305a are data sections. Further, A, B, and C indicate file names, and numbers in parentheses indicate append flags. In this example, the file with file name A was originally data A(1), but now it is shown as data A(2) and data A(3).
Two additional recordings have been made. Therefore, the data of file A is divided and recorded into data sections 301a, 304a, and 305a. Note that no data is added to the files with file names B and C. Here, when changing the file name A, as shown in FIG. 2, a directory indicating the change of the file name is recorded in the directory section 306. Additionally, a new file name is recorded in the directory section 307. As a directory indicating a file name change, information (R) indicating that the directory itself is a directory indicating a file name change and the file name A of the file to be changed are recorded. Further, as the directory indicating the file name of the new file, information (N) indicating that the directory itself is new, that is, a directory indicating the changed file name, and the changed file name D are recorded. In this way, by recording the directory indicating the file name change, the file name of the target file can be changed to a desired file name.

Next, the operation when reproducing an optical card in which a directory indicating a file name change is recorded as described above will be explained. FIG. 4 shows directory information recorded on the optical card, and is the same as the directory information recorded in FIG. 2. When this optical card is inserted into the information recording/reproducing apparatus explained in FIG.
Directory information 01 to 307 is reproduced by the optical head 43. Then, all or a necessary part of the directory information in the directory section (in this embodiment, directory sections 301 to 3
05) is read. FIG. 5 shows a state in which the directory information of the directory sections 301 to 305 is read into the memory 42.

When each piece of information in the directory section is read in this way, the host computer 32 reads the directory section 3.
06,307, it is recognized that file name A has been changed to file name D. As a result, the host computer 32 rewrites the file name of the directory information in the directory sections 301, 304, and 305 stored in the memory 42 to D, as shown in FIG. Therefore, all applicable file names can be changed to the desired file names, and the host computer 32 thereafter manages the files using the directory information shown in FIG. 6.

FIG. 7 is a schematic diagram showing an example of a directory format used in the present invention. Here, the directory 49 includes a file name part 50, an extension part 51, an attribute part 52, a first track number part 53, and a first sector number part 5.
4, a file size section 55, an append flag 56, and a delete bit 57. Each portion consists of one or more bits of code data. The append flag 56 indicates that the directory corresponds to an added partial file, as described in the above-mentioned Japanese Patent Laid-Open No. 1-258288. In addition, in the present invention, the append flag 56 contains information (R) indicating that the directory is for changing the file name.
Information (N) indicating that the directory is a new file name is also recorded. delete bit 57
The above-mentioned JP-A-63-69072 and JP-A-63-9
As described in No. 1888, this is information indicating the deletion directory. For example, a directory with a delete bit of 0 indicates a normal directory or a changed directory, and a directory with a delete bit of 1 indicates an erased directory.

FIG. 8 is a schematic diagram showing a directory recorded in a directory recording area of a medium using the format shown in FIG. In this example, a plurality of tracks are formed in parallel on an optical card, and two sectors each containing 128 bytes of data are recorded on each track. Figure 8
In, No. Directory 1 has the file name “AB”
This indicates that the data with the file name "DE" is recorded in the first and second sectors of the track No. 1.Similarly, the data with the file name "DE" is recorded in the first and second sectors of the track No. 1.
This indicates that the data is recorded in the first sector of the track. Also, No. Directory 3 has the file name “FGH
” is recorded in the second sector of the No. 2 track. The No. 4 directory is a directory that indicates that the data with the file name “DE” is to be logically erased. .This is No.4.
This is determined from the fact that the delete bit (DB) of the directory is 1. No. 20 directories are No.
．． This shows that the data in the first sector of track 100 has been added to the data with the file name "ABC". This means that No. This is determined from the fact that the append flag of the 20th directory is 2. Similarly, No.
30 directories are No. The data recorded in the first and second sectors of 200 tracks is named “AB”.
This indicates that the file name "ABC" has been added to the data in the No. 31 directory. This is determined from the fact that the append flag of the No. 30 directory is 3. This indicates that the file name will be changed. This can be determined from the fact that the append flag is R. Also, in the directory No. 32, the new file name of the file whose file name will be changed is “
IJK". This is determined from the fact that the append flag is N.

[0022] The directory recorded as shown in Fig. 8 is
When read by the apparatus of FIG. 3, the information stored in memory 42 will be as shown in Table 1 below.

[0023]

[Table 1] In Table 1, the file name “IJK” is “ABC
”. Therefore, the first track number, first sector number, and file size are the same as those recorded in directories No. 1, No. 20, and No. 30 in FIG. 8. Also, File name “DE”
is the directory number. 4, the memory 42
has been deleted from.

FIG. 9 is a schematic diagram showing a specific example of the append flag shown in FIG. 9 is completely the same as FIG. 8 except for the append flag, and a detailed explanation of these parts will be omitted. In this example, the append flag (AF) consists of 2 bits of append bit (AB) and 2 bits of change bit (C
B) consists of Directory No. in FIG. 1, No. 2
0, No. 30 append flags “1”, “2”, “3”
” are “01” and “10” in AB of FIG. 9, respectively.
”, “11”. Also, append flags “R” and “N” of directories No. 31 and No. 32 in FIG. 8 are represented as “01” and “10”, respectively, in CB of FIG. It will be done.

The present invention can be applied in various ways other than the embodiments described above. For example, in the embodiment, the information indicating that the directory has been changed is part of the append flag, but this information may be provided completely independently of the append flag. Furthermore, in the embodiment, an example has been shown in which information (N) indicating that the directory includes a new file name is recorded in the append flag. However, this information (N) is not necessarily necessary, and if it is decided that the directory recorded subsequent to the directory containing the file name to be changed will contain the new file name, there is no need to record the information (N). I don't mind. Furthermore,
In the embodiment, the case where an optical card is used has been described, but the present invention can be applied to any other medium such as an optical disk. In particular, the present invention is effective when applied to non-rewritable media.

[0026] The present invention includes all of the above-mentioned applications as long as they do not depart from the scope of the claims.

[0027]

[Effects of the Invention] As explained above, according to the present invention,
Even if the recorded information is on a recording medium that cannot be changed, that is, it cannot be erased or rewritten, or even if data has been added several times and there are multiple directories for file management. Even if the file name is
File names can be easily changed by just recording two directories. Therefore, not only does it take less time to change the file name, but also the file name can be changed with a small amount of information, so the proportion of directory information occupied is small, and the information capacity of the medium can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the structure of files and directories for explaining the file management method of the present invention.

FIG. 2 is a schematic diagram of the structure of files and directories for explaining the file management method of the present invention.

FIG. 3 is a block diagram showing a configuration example of an optical card recording/reproducing device used in the present invention.

FIG. 4 is a schematic diagram showing directory information stored in memory in the file management method of the present invention.

FIG. 5 is a schematic diagram showing directory information stored in memory in the file management method of the present invention.

FIG. 6 is a schematic diagram showing directory information stored in memory in the file management method of the present invention.

FIG. 7 is a schematic diagram showing an example of the format of a directory of a medium used in the present invention.

FIG. 8 is a schematic diagram showing an example of a directory recorded by the method of the present invention.

FIG. 9 is a schematic diagram showing an example of a directory recorded by the method of the present invention.

FIG. 10 is a schematic plan view showing an example of an optical card that can be used in the present invention.

FIG. 11 is a schematic diagram for explaining a conventional method of logically deleting a directory.

[Explanation of symbols]

1 Optical card 31 Drive 32 Host computer 33 MPU 34 AT/AF control circuit 35 Modem circuit 42 Memory 43 Optical heads 301 to 307 Directory section 301a to 30
5a Data section

Claims (2)

[Claims] Claim 1. A file management method for managing file information recorded on an information recording medium using directory information, wherein a directory section of the recording medium indicates that the directory itself is a directory indicating a change in a file name. A file management method characterized by additionally recording a first directory containing information and a file name to be changed, and a second directory containing a file name after the change. 2. When reproducing the recording medium, rewriting the file name of the corresponding file in the directory information stored in the storage unit for file management to the specified file name according to the additionally recorded directory; 2. The file management method according to claim 1, wherein files are managed based on the changed directory information.