JP2003280960A - File management program and recording medium - Google Patents

Abstract

(57) [Problem] To provide a file management program and a recording medium capable of recording data on a recording medium in a short time. SOLUTION: In a file management program for managing information to be recorded on a recording medium divided into a plurality of clusters by the MS-DOS system, a usage state of a predetermined number of clusters sequentially from FAT recorded on the recording medium. And assigns a new G cluster number to a predetermined number of clusters read out, assigns a usage status for the assigned G cluster number based on the usage status of the read cluster, creates a GFAT, and writes the GFAT to the recording medium. When the information is recorded, an empty G cluster number whose use status is empty is sequentially searched, and information is continuously recorded in the cluster having the predetermined number of cluster numbers corresponding to the empty G cluster number obtained by the search.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a file management program and a recording medium for managing information recorded by the OS system.

[0002]

2. Description of the Related Art A conventional method of recording information on a recording medium of the MS-DOS system will be described with reference to FIGS.

In FIG. 3, reference numeral 8 denotes a memory card which is a recording medium for recording information, 8A is a master boot sector area in which parameters such as cylinders, head tracks and sector tracks are recorded, and 8B is a partition sector. Area, sector size, which is the minimum physical recording unit of the recording medium, number of sectors per cluster, FAT
Parameters necessary for DOS file management such as (File Allocation Table) are recorded.

Reference numeral 8C is FAT, the usage status of the cluster is recorded, a copy of FAT1 is recorded in FAT2, and when the recording of FAT1 is abnormal, the value recorded in FAT2 is used.

Reference numeral 8D is a root directory area, and as shown in FIG. 5, the file name, extension, attribute, recording time, recording date, starting cluster number, file size, etc. of the file recorded in the data area 8E are recorded. To be done.

FIG. 4 shows a recording example of the FAT shown in 8C. The address of the FAT 8C corresponds to the cluster number of the data area 8E, and the usage status of the cluster corresponding to the cluster number is recorded.

As shown in FIG. 4, the usage status is "000".
Indicates unrecorded, “FFF” indicates the cluster in which the final data is recorded, and the records other than “000” and “FFF” record the cluster number recorded next.

Therefore, when the number of the starting cluster shown in FIG. 5 is "000", the data of this file is shown in FIG.
, The cluster numbers “000” to “00
4 ”,“ 006 ”, and“ 007 ”. Also, the starting cluster number is "010"
File is recorded in the clusters with cluster numbers “010” and “011”.

Therefore, in order to read the data recorded in the data area 8E, first the file name recorded in the root directory area 8D is searched, the number of the starting cluster is read, and the read cluster number corresponds to the read cluster number. The recorded data is read from the cluster in the data area 8E.

When the reading of the data from the cluster is completed, it is judged by accessing the FAT8C whether or not the data is recorded following the read cluster, and the data is recorded in "FF".
In the case of other than "F", the reading of the data recorded in the cluster corresponding to the recorded cluster number is continued.

Further, when recording new file data, the address of FAT8C is sequentially searched from the beginning, a cluster whose usage status is "000", that is, an unrecorded cluster is found, and the data is recorded in the found cluster.

Therefore, in the case shown in FIG. 4, data is recorded in the cluster number "005" of the data area 8E, and the next unrecorded cluster number "008" is recorded in the usage status of the FAT 8C and the data is recorded. File data is recorded in the cluster number “008” in the area 8E.

When the recording of the file data is completed, the usage status corresponding to the cluster number of the FAT8C in which the final data is recorded is recorded as "FFF" and the processing is completed.

[0014]

When data is recorded on the recording medium by the MS-DOS method, as described above, "000" indicating the empty area is searched from the FAT, and "000" is found. If so, the logical address of the recording medium is obtained from the cluster number, and writing is performed at the obtained logical address.

The logical address can be calculated from the cluster number by
This is performed by the DOS parameter recorded in the partition sector area 8A described above. Therefore, when one file is composed of a plurality of clusters, it is necessary to search for an empty cluster and calculate a logical address for each cluster, which requires a long time for the file recording process.

The size of the cluster can be changed by the DOS parameter. However, if the cluster size is increased, the number of times the empty cluster is searched and the logical address is calculated is reduced, and the file recording processing time can be reduced. Is the minimum recording unit, and if the cluster size is increased more than necessary, an empty area in which no data is recorded occurs in the cluster in which the final data of the file is recorded, and the use efficiency of the recording medium is reduced.

An object of the present invention is to provide a file management program and a recording medium capable of recording a large amount of data such as image data picked up by a digital camera on a recording medium in a short time.

[0018]

According to the invention of claim 1, MS-DO is provided on a recording medium divided into a plurality of clusters.
In a file management program for managing information recorded by the S method, the usage status of a predetermined number of clusters is sequentially read from the FAT recorded on the recording medium, and a new G cluster number is assigned to the read predetermined number of clusters. G and assigns the usage status for the assigned G cluster number based on the usage status of the read cluster.
A FAT is created, and when the information is recorded on the recording medium, G cluster numbers whose use status is empty are sequentially searched, and clusters of the predetermined number of cluster numbers corresponding to the empty G cluster numbers obtained by the search. To record information continuously.

In the invention of claim 2, the GFAT
Is recorded in a memory different from the recording medium. Claim 3
In the invention, the number of the clusters forming the G cluster can be changed according to the recording medium.

In the invention of claim 4, the number of the clusters forming the G cluster is determined according to the total recording capacity of the recording medium. In the invention of claim 5,
The number of the clusters forming the G cluster is determined by the image quality mode recorded by the digital camera.

In the invention of claim 6, the information recorded on the recording medium is image information captured by a digital camera.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS.
Will be described with reference to. FIG. 1 is a block diagram of an embodiment of the present invention,
2 is an operation flowchart of the embodiment, FIG. 3 is a configuration diagram of a memory card, FIG. 4 is an example of FAT recording, FIG. 5 is an explanatory diagram of a root directory, and FIG. 6 is an explanatory diagram of GFAT.

FIG. 1 is a block diagram of an embodiment in which the present invention is applied to a digital camera. 1 is an image pickup section, 2 is an image memory for recording image data picked up by the image pickup section 1, 3 is a display section,
4 is an operation unit, 5 is a program memory in which the file management program of the present invention is recorded, 6 is a RAM, 7 is a compression unit for compressing captured image data, and 8 is a memory for recording the compressed image data. A card, 9 is an interface (I / O), and 10 is a processor for processing.

The program memory 5 stores the file management program of the present invention and the MS-DO described in the conventional example.
A program for recording and reading data by the S method is recorded.

Further, the memory card 8 is provided with the master boot sector area 8A, the partition sector area 8B, the FAT 8C, the root directory area 8D and the data area 8E described with reference to FIG. Data is recorded.

Next, an embodiment of the present invention will be described with reference to FIG. For example, the operation is started when the power of the digital camera is turned on. In step S1, the usage statuses of the clusters are sequentially read from the FAT 8C of the memory card 8 and G (group) FATs are created in the RAM 6.

FIG. 6 shows GF corresponding to FAT8C.
AT is shown, and the address of GFAT is represented by a G (group) cluster number, and the G cluster number is given to every four consecutive clusters of FAT.

As for the usage status corresponding to the G cluster number of GFAT, if even one usage status of the four cluster numbers of the corresponding FAT is in use, "fff" is given, and all four are not used. "00x" that can be used if used
Is given. In addition, "x" of "00x" is the next unused G
Use the cluster number.

Therefore, since the usage status corresponding to the G cluster numbers 000 to 002 of GFAT shown in FIG. 6 is in use, "fff" is recorded and the G cluster number 003.
The usage statuses of the cluster numbers 012 to 015 corresponding to are all unused, and the next unused G cluster number 00
Since there are 5 G clusters, “005” is recorded in the usage status of the G cluster number 003.

If there is no unused G cluster next, for example, as shown in G cluster number 005, "FF
Record "F". As described above, in step S1, RA
Create and record GFAT on M6.

In step S2, it is determined whether or not the recording image quality mode of the image to be recorded on the memory card 8 has been changed by the operation unit 4. If the determination is NO, the process proceeds to step S3, and if the determination is YES. In step S1, the number of clusters corresponding to the G cluster number described in FIG. 6 is changed in accordance with the image quality mode, and GFAT is created again.

In step S3, it is determined whether or not the shutter of the operation unit 4 is pressed. If the determination is NO, the process proceeds to step S2, steps S2 and S3 are repeated, and if the determination is YES, the process proceeds to step S4. Move.

In step S4, the compression unit 7 causes the imaging unit 1
The image data picked up by and recorded in the image memory 2 is compressed according to the set image quality mode. In step S5, the GF recorded in the RAM 6 described above.
The usage status of the G cluster number of the AT is sequentially read, and the unrecorded G cluster number in which the image data is not recorded is searched.

If an unrecorded G cluster is not found in step S5, the process moves to step S9, the capacity over indicating that the memory card 8 cannot be recorded is displayed on the display unit 3 and the like, and the process ends.

When an unrecorded G cluster is searched in step S5, the process proceeds to step S6, and the compressed image data is sequentially recorded in the cluster corresponding to the searched G cluster.

That is, in the state shown in FIG. 6, the G cluster number 003 is searched first, and the compressed image data is sequentially recorded in the clusters of the cluster numbers 012 to 015 corresponding to the G cluster number 003.

In step S7, the cluster numbers 012 to
Even if the image data is recorded in the cluster of 015, it is determined whether or not there is compressed image data that is not recorded.
In the case of ES, the process proceeds to step S5 and steps S5 to S7.
And S9 are repeated.

When the unrecorded compressed image data is recorded in the memory card 8 for the second time, since the usage status of the G cluster number 003 searched for the first time is "005", the empty G in step S5 is recorded. No cluster search is performed, and cluster numbers 020 to 023 corresponding to G cluster number 005
The compressed image data is sequentially recorded in the cluster.

If there is unrecorded compressed image data even after the second recording, the use status of the G cluster number 005 of the second time is "FFF", so the determination in step S5 is NO. Is determined, step S9 is executed, and the process ends.

If the determination in step S7 is NO, that is, if all the compressed image data has been recorded, step S7 is performed.
8, the root directory is recorded for the image data recorded by the MS-DOS method described in the conventional example, the usage status of the cluster in which the FAT is recorded is changed, and the usage status of the G cluster is changed. Then, steps S2 to S9 are repeated.

In the embodiment, GFA in step S1
In the creation of T, the usage status of the G cluster was recorded as the G cluster number if there is a next free G cluster. However, whether or not the usage status is empty is recorded, and step S5 You may make it search for an empty G cluster every time.

In the embodiment, G is set depending on the recording image quality mode.
Although the number of clusters forming the cluster is changed, it may be changed according to the recording medium or the total capacity of the recording medium.

Although the embodiment has been described with respect to the case where the image data picked up by the digital camera is recorded in the memory card, it can be applied to the case where the information is recorded in the recording medium by a general personal computer or the like. .

[0044]

According to the present invention, the usage status of a predetermined number of clusters is sequentially read from the FAT recorded on the recording medium, a new G cluster number is assigned to the read predetermined number of clusters, and the assigned G cluster is assigned. The usage status for the cluster number is added based on the usage status of the read cluster.
A FAT is created, and when the information is recorded on the recording medium, G cluster numbers whose use status is empty are sequentially searched, and clusters of the predetermined number of cluster numbers corresponding to the empty G cluster numbers obtained by the search. Since information is continuously recorded in the recording medium, it is not necessary to search for an empty cluster and calculate a logical address for each cluster when recording data on the recording medium, and it is possible to record a large amount of data in a short time. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an operation flowchart of the same embodiment.

FIG. 3 is a configuration diagram of a memory card.

FIG. 4 is a diagram showing an example of FAT recording.

FIG. 5 is an explanatory diagram of a root directory.

FIG. 6 is an explanatory diagram of GFAT.

[Explanation of symbols]

1 Imaging unit 2 image memory 3 Display 4 operation part 5 Program memory 6 RAM 7 Compressor 8 memory cards 9 Interface (I / O) 10 Processor (CPU)

Claims (7)

[Claims] 1. A file management program for managing information recorded by a MS-DOS method on a recording medium divided into a plurality of clusters, wherein a predetermined number of clusters are sequentially used from the FAT recorded on the recording medium. The situation is read, a new G cluster number is given to the read predetermined number of clusters, and the use situation for the given G cluster number is given based on the use situation of the read cluster to create GFAT, and the recording medium is recorded. At the time of recording information on the G cluster number, the G cluster number whose use condition is empty is sequentially searched, and the information is continuously recorded on the cluster of the predetermined number of cluster numbers corresponding to the empty G cluster number obtained by the search. , A file management program characterized by the above. 2. The GFAT is recorded in a memory different from the recording medium.
File management program as described. 3. The file management program according to claim 1, wherein the number of the clusters forming the G cluster can be changed according to the recording medium. 4. The file management program according to claim 1, wherein the number of the clusters forming the G cluster is determined according to the total recording capacity of the recording medium. 5. The file management program according to claim 1, wherein the number of the clusters forming the G cluster is determined by an image quality mode recorded by a digital camera. 6. The file management program according to claim 1, wherein the information recorded on the recording medium is image information captured by a digital camera. 7. A recording medium in which the file management program according to claim 1 is written.