JP2012133708A - File recording device, control method thereof, program and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital camera having a creation rule of a standardized DCF file regardless of the type of mounted recording medium.SOLUTION: When a recording medium mounted in a mounting part is a write-once type recording medium, a file recording device allots predetermined plural clusters to create a new directory as a region for recording the entry of directory corresponding to the file which is recorded in the directory. When the recording medium is a rewritable type, the file recording device allots a cluster as a region for recording the entry of directory corresponding to the file which is recorded in the directory when creating a new directory.

Description

  The present invention relates to a file recording apparatus having a file system for recording a data file, such as a digital camera that handles image files, and a control method therefor.

  2. Description of the Related Art Conventionally, a digital camera that converts an image captured using a solid-state image sensor such as a CCD into a digital image and records / reproduces a still image or a moving image on a memory card having a solid-state memory element is widely used. In such a digital camera, a subject image formed by the subject luminous flux that has passed through the imaging lens reaches a solid-state imaging device such as a CCD is converted into an electrical signal and output as an image signal. The image signal output from the solid-state imaging device is subjected to various conversion processes in the image processing circuit, and finally stored as an image file in a recording medium such as a memory card.

  As a standard for managing an image file on a recording medium of a digital camera using a FAT file system, DCF (CIPA standard: Design rule for Camera File system) is currently widely used. Generally, a digital camera manages files with numbered file names in accordance with the DCF standard. In other words, directory names and file names on the recording medium are managed by numbers that do not overlap, and file names and directories are created by increasing the file numbers and directory numbers one by one in the order of recording. In the DCF standard, the directory name is composed of xxxyyyy (xxx: numeric value from 100 to 999, y: any character), and the file name is YYYYXXX (XXXX: numeric value from 0001 to 9999, Y: free character). In the DCF standard, a DCF object having the same number as the DCF file name is defined, and a mechanism for configuring one object with a plurality of files is prepared.

  When recording such a DCF standard on a recording medium, it is difficult to predict the number of files stored in the DCF directory when it is created. Therefore, when generating a DCF directory on a normal rewritable recording medium, the directory is generated with a minimum number of clusters (= 1) established as a directory. Thus, the DCF file entry information is continuously added to the directory created with the minimum number of clusters (= 1), and when the entry cannot be secured in one cluster, another one cluster is newly assigned to the entry. Was expanding the directory in a way.

  It should be noted that, when data recorded on one medium is copied to the other medium, the size of the subdirectory is set according to the remaining capacity of the copy destination medium in relation to a technique for creating a subdirectory on the copy destination medium. Technology is disclosed. (See Patent Document 1)

JP 07-271638 A

  Recently, a write-once recording medium equipped with a FAT file system has been developed. In this write-once recording medium, data can be written only once, and recorded data cannot be changed or erased.

  When the DCF directory is created using this write-once type recording medium, the FAT cluster chain information cannot be rewritten when the directory is expanded as in the prior art. In other words, when a write-once type recording medium is used, additional files are recorded and when the directory entry cannot be secured in one cluster, the cluster chain can be updated to newly allocate another cluster. Absent. Therefore, files can be created in the DCF directory as many as the number that can be assigned to one cluster assigned at the time of directory creation.

  A method of sorting data files such as image files to be recorded in units of directories is effective as image file management means. At this time, if the number of files that can be stored in a directory is limited by one cluster size when using a write-once recording medium, a much larger number of directories will be generated than before, which is inconvenient for image management. Occurs. Further, when used in combination with a rewritable recording medium, the number of files that can be recorded in one directory differs from recording medium to recording medium, which similarly causes inconvenience in image management.

  An object of the present invention is to provide a digital camera having a DCF file creation rule that is uniform regardless of the type of a recording medium that is mounted, in which the above inconvenience is eliminated.

  In order to achieve the above object, a file recording apparatus of the present invention is a file recording apparatus for recording a data file on a recording medium using a FAT file system, and a mounting section for mounting the recording medium and a mounting section for mounting the recording medium When the determined recording medium is a write-once type recording medium or a determination unit that determines whether the recording medium is a rewritable type recording medium, and the determination unit determines that the recording medium is a write-once type recording medium, When a plurality of predetermined clusters are allocated to an area for recording an entry corresponding to a file to be recorded in the directory, and a new directory is generated when the determination unit determines that the recording medium is a rewritable recording medium In order to record an entry corresponding to a file to be recorded in one directory for each cluster It characterized by having a recording means for recording the FAT to assign the frequency.

  According to the present invention, when a file is recorded with the FAT file system, it is possible to guarantee a directory creation rule when a rewritable recording medium is used when a write-once recording medium is used. . In particular, when an upper limit is set for the number of data files that can be recorded in one directory, the same upper limit is applied even when a write-once type recording medium is used, even when a rewritable type recording medium is used. It becomes possible to do.

1 is a diagram illustrating a system configuration of an entire image recording apparatus according to an embodiment. It is a flowchart figure which shows the main processing operation | movement of the image recording device which concerns on embodiment. FIG. 6 is a flowchart showing a new recordable determination processing operation of the image recording apparatus according to the embodiment. It is a flowchart figure which shows the imaging | photography process operation | movement of the image recording device which concerns on embodiment. It is a flowchart figure which shows the audio | voice recording operation | movement of the image recording device which concerns on embodiment. It is a schematic diagram which shows the directory structure recorded on the recording medium with which the image recording device which concerns on embodiment is loaded. It is a schematic diagram showing directory creation when a rewritable recording medium is loaded in the image recording apparatus according to the embodiment. It is a schematic diagram showing directory creation when a write-once recording medium is loaded in the image recording apparatus according to the embodiment. It is a flowchart in the case of performing an audio | voice recording process with the image recording device which concerns on embodiment.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of the digital camera 100 according to the present embodiment. In FIG. 1, reference numeral 100 denotes a digital camera. Reference numeral 21 denotes an optical system including a photographic lens. An image pickup unit 22 includes a CCD, a CMOS element, or the like that converts an optical image into an electric signal. Reference numeral 23 denotes an A / D converter that converts an analog signal into a digital signal, and is used when the analog signal output from the imaging unit 22 is converted into a digital signal.

  Reference numeral 31 denotes a microphone, which is connected to the audio control unit 32. An output of the audio control unit 32 is input to the A / D converter 23, and an analog signal is converted into a digital signal.

  A timing generation unit 12 supplies a clock signal and a control signal to the imaging unit 22, the A / D converter 23, the D / A converter 13, and the audio control unit 32. The timing generator 12 is controlled by the memory controller 15 and the system controller 17.

  An image processing unit 24 performs resize processing such as predetermined pixel interpolation and reduction, color conversion processing, and the like on the data from the A / D converter 23 or the data from the memory control unit 15. The image processing unit 24 also performs predetermined calculation processing using the captured image data, and the system control unit 17 performs exposure control and distance measurement control based on the obtained calculation result. Thereby, AF (autofocus) processing, AE (automatic exposure) processing, and EF (flash pre-emission) processing of the TTL (through-the-lens) method are performed. The image processing unit 24 further performs predetermined calculation processing using the captured image data, and also performs development processing such as TTL AWB (auto white balance) processing based on the obtained calculation result.

  Output data from the A / D converter 23 is written into 30 memories via the image processing unit 24 and the memory control unit 15 or directly via the memory control unit 15. The memory 30 is a memory for storing captured still images.

  A compression / decompression unit 16 performs irreversible compression / decompression and reversible compression / decompression processing on image data by adaptive discrete cosine transform (ADCT) or the like. Also, triggered by the operation of the shutter button 11, the photographed image data stored in the memory 30 is read and subjected to compression processing, and the processed data is written to the memory 30. The image data written to the memory 30 by the compression / decompression unit 16 is filed by the system control unit 17 and recorded on the recording medium 200 via the interface 18.

  The memory 30 also serves as an image display memory. Reference numeral 13 denotes a D / A converter, and reference numeral 14 denotes an image display unit composed of an LCD or the like. Display image data written in the memory 30 is displayed by the image display unit 14 via the D / A converter 13.

  Reference numeral 17 denotes a system control unit that controls the entire digital camera 100, and reference numeral 29 denotes a system memory that stores constants, variables, programs, and the like for operation of the system control unit 17.

  Reference numeral 11 denotes a shutter button, which includes a first shutter switch SW1 (10) and a second shutter switch SW2 (11).

  Reference numeral 25 denotes a recording image quality setting unit for the user to determine the recording image quality of the digital camera 100, and can set the compression rate and image size during JPEG recording. Furthermore, the recording image quality setting unit 25 has a mode for recording other recording formats such as a RAW recording mode for recording an image held in the memory 30 after A / D conversion as it is, and a moving image recording mode for recording video and audio. It can also be set.

  The first shutter switch SW <b> 1 (10) is turned on while the shutter button 61 provided in the digital camera 100 is being operated (half-pressed). This instructs the digital camera 100 to start operations such as AF (autofocus) processing, AE (automatic exposure) processing, AWB (auto white balance) processing, and EF (flash pre-flash) processing.

  The second shutter switch SW2 (11) is turned on when the operation of the shutter button 11 is completed (fully pressed). As a result, the digital camera 100 is instructed to start a series of imaging processing operations from reading a signal from the imaging unit 22 to writing image data on the recording medium 200.

  The recording button (31) is an instruction member for recording audio data input from the microphone 31 in the recording unit 19. The system control unit 17 receives a recording start instruction from the recording button (31), and generates an audio file as a configuration file of the DCF object recorded in the recording unit 19.

  A file management unit 20 converts the image data compressed by the compression / decompression unit 16 and stored in the memory 30 into a file when the image data is recorded in the recording unit 19. Further, the directory and file recorded in the recording unit 19 are analyzed, and a process for determining a file name and a directory name used when making the file is performed. The system control unit 17 records a data file such as an image file on the recording medium 200 via the interface 18 using the file name or directory name determined by the file management unit 25.

  Reference numeral 18 denotes an interface with the recording medium 200 such as a memory card or a hard disk, and reference numeral 25 denotes a connector for connecting the recording medium 200 and the interface 18. Reference numeral 28 denotes a recording medium attachment / detachment detection unit that detects whether or not the recording medium 200 is attached to the connector 25 that functions as an attachment unit for attaching the recording medium.

  Reference numeral 200 denotes a recording medium such as a memory card or a hard disk. The recording medium 200 includes a recording unit 19 composed of a semiconductor memory, a magnetic disk, and the like, an interface 27 with the digital camera 100, and a connector 26 for connecting the recording medium 200 and the digital camera 100.

  Next, a directory structure conforming to the DCF standard will be described with reference to FIG. The recording unit (19) records data formatted in the FAT file system. The recording unit (19) is generally composed of an MBR (Master Boot Record) area, a BOOT sector area, a FAT (File Allocation Table) area, a directory entry area, and a data area. In the FAT file system, a directory entry and a data area are managed for data recording position and free space based on cluster connection information called FAT. A directory structure as shown in FIG. 6 is recorded in the recording unit (19). A DCIM directory (602) is recorded in the root directory (601: top directory). In the DCIM directory (602), a DCF directory composed of XXXXYYYYY (XXX: file number composed of 0-9 numerals, Y: free character) is recorded (603, 604, 605). In the DCF directory 100IMAGE (603), JPEG files called DCF basic files are recorded (606, 608, 610, 611). The DCF basic file constitutes a DCF object together with files having the same file number. For example, the DCF basic file IMG_0002. JPG (608) is a RAW image file IMG_0002. It is possible to construct a DCF object with CR2 (607). Similarly, the DCF basic file IMG_0003. JPG (610) is a file IMG_0003. MOV (609) and DCF objects can be constructed. Further, in the voice recording process (S208) according to the instruction from the recording button (31), the DCF basic file IMG_0004. JPG (611) and an audio file IMG_0004. A DCF object can be configured with WAV.

  In the digital camera described in this embodiment, the number of DCF objects that can be recorded in one directory is set to 2000. As described above, by configuring a DCF object in the DCF directory, it is possible to have one object and a plurality of files, and it is possible to have 9999 objects from the file number specification. Generally, when the number of files stored in one directory increases, the directory search process takes time. When the directory search process takes time, a process for generating a file name for a captured image, which will be described later, or a playback function for reading an image file recorded in the recording unit 19 into the memory 30 and displaying it on the image display unit 14 is executed. Response speed is affected. Generally, in the digital camera, the response speed is maintained by limiting the number of DCF objects that the digital camera can generate in one directory separately from the DCF rule.

  For example, consider a digital camera designed to record 2000 images in one directory. In the digital camera 100, IMG — 0001. JPG (613) to IMG_2000. Consider a case where the next shooting process is performed in a state where still images up to JPG (615) are recorded. Then, a new DCF directory 102 IMAGE (605) is created using a directory new creation function described later, and a new file IMG — 0001. JPG (616) is created and recorded in the recording unit 19.

  Next, the operation flow of the digital camera will be described with reference to FIG. When the power is turned on (S201), the system control unit (17) initializes the recording medium 200, and the recording medium type determination unit (28) executes a recording medium determination process (S202). In the recording medium determination, the type information is read from the recording medium, and the types of the recording medium 200 are determined as a read-only read-only recording medium, a write-once recording medium, and a rewritable recording medium. Further, the system control unit (17) reads the FAT data recorded in the recording unit 19 and searches for the number of free clusters to calculate the free capacity.

  Next, a new record determination process (S203) is performed in the directory generation unit (31). The contents of the new record determination process will be described later. If it is determined that new recording is not possible, the apparatus waits for a power-off instruction (S209). When it is determined that new recording is possible as a result of the new recording determination (S203) (S204), upon receiving a shooting start instruction (S205) based on the instruction to press the shutter switch SW2 (11) described above, a shooting process described later with reference to FIG. (S206) is executed. When receiving a recording start instruction from the recording button (31) (S207), the system control unit 17 executes a recording / recording process (S208) described later with reference to FIG. The system control unit 17 repeats the above processing until detecting a power-off instruction (S209), and upon receiving the power-off instruction (S209), the system control unit 17 ends (S210).

  FIG. 3 describes the process flow of the new recordability determination process (S203) executed by the directory generation unit (31). In the directory generation unit (31), the maximum directory number (M), the new directory number (M ′), the maximum file number (m), the new file number (m ′), the number of files (fc), and the recording are recorded in the system memory (29). The number of empty FAT clusters recorded in the unit 19 is held. The new record enable determination process (S203) initializes the new directory number (M ') with 0 at the start of the process (S301).

  Subsequently, the root directory is searched (S302). In the case of the directory structure as shown in FIG. 6, the DCIM directory (602) can be detected by performing the root directory search (S302). If a DCIM directory exists (S303), a DCIM directory search is performed (S304). In FIG. 6, the DCF directories 100 IMAGE (603), 101 IMAGE (604), and 102 IMAGE (605) can be detected by searching the DCIM directory (602). Here, the directory generation unit 31 specifies the directory having the maximum directory number among the DCF directories detected from the DCIM directory (S305), and stores the directory number as a variable M in the system memory 29. In the case of FIG. 6, 102IMAGE (605) corresponds. Subsequently, the directory generation unit (31) searches for the maximum directory (S306).

  By searching the maximum directory, it is possible to enumerate the files constituting the DCF object. For example, when 102IMAGE (605) is searched, IMG_0001. JPG (616) can be detected. Here, the number of DCF files stored in the directory is stored in the system memory 29 as a variable fc, and the number of DCF objects is stored as a variable name Oc. When the 100IMAGE directory (603) in FIG. 6 is the maximum directory, fc is 7, but Oc is 4. At this time, the maximum file number among the file numbers recorded in the DCF file is recorded in the system memory 29 with the variable name m. Subsequently, the comparison processing of the number of files (fc) described above is performed (S310).

  Here, the numerical value to be compared can be changed according to the type of the recording medium determined in the recording medium determination process (S202). In the digital camera of the present embodiment, the maximum number of files is limited to 2000 as an upper limit in the case of a write-once recording medium, and no upper limit is set in the case of a rewritable recording medium. If the number of files (fc) is less than the upper limit (S310), it is determined whether the number (m + 1) next to the maximum file number is a numerical value that can be created (S311). For example, when m = 9999, the next number cannot be generated. When the number (m + 1) next to the maximum file number can be generated, the current maximum directory number (M) and the maximum file number (m) are recorded in the system memory (29).

  On the other hand, if the number of files (fc) is greater than or equal to the upper limit (2000 or more in this embodiment), it is possible to create a directory (M + 1) next to the maximum directory number (M) in order to create a new file in a new directory ( S313) is performed. When the next directory can be created, the new directory number (M ′) is incremented by 1 from the current maximum directory number (M) (M = M + 1), and the newly created file number (m ′) is set to 1. Subsequently, when the next directory number cannot be generated for the maximum directory number (M) (S313), -1 is set to the maximum directory number (M) and the maximum file number (m). When the DCIM directory does not exist in the recording unit (19), the maximum directory number (M) and the maximum file number (m) are both set to 0. In this state, the maximum directory number (M) and the maximum file number (m) are stored in the system memory (29) (S312). Subsequently, when the maximum file number (M) and the maximum file number (m) stored in the system memory (29) are negative (S317), a warning such as “Cannot create file name” is displayed on the image display unit (14). Display is performed (S318). When the maximum file number (M) and the maximum file number (m) are 0 or more, the new record enable determination process (S203) is terminated (S319).

  FIG. 4 describes the photographing process (S206) of the digital camera 100 equipped with the present embodiment. When the shooting process is started (S401), the system control unit 17 refers to the recording medium type determined in the recording medium determination process (S202). In the case of a rewritable recording medium (S402), an exposure process (S405) that involves opening and closing the shutter is performed, and subsequently, an image read from the imaging unit 22 to the memory (30) is developed and compressed (S406), and the recording medium ( 19) is stored in the memory (30) as a data format that can be recorded. The pre-recording data stored in the memory (30) is recorded in the recording unit (19) through a recording process (S407) described later, and the photographing process (S206) is terminated.

  On the other hand, when it is determined in the recording medium determination process (S202) that the recording medium is a write-once type recording medium (S402), the current shooting mode is determined (S403). In the shooting mode determination, for example, in a shooting mode having a read-out function, when the read-out process is realized by rewriting the directory entry recorded in the recording unit (19), this rewrite process cannot be performed on the write-once recording medium. It becomes a function that cannot be realized.

  Control is performed so that a recording mode in which a plurality of files are recorded at a time, such as simultaneously recording a JPEG file at the time of RAW file recording or simultaneously recording a still image file simultaneously with moving image recording, cannot be executed.

  This is because an upper limit number (for example, 2000) that can be created in one directory is set, but in the mode in which a plurality of files are recorded at a time, the upper limit number 2000 is reached in fewer times than 2000 shootings. . In the case of a mode in which high-speed continuous shooting images are recorded by shooting on the first floor, there is a design that exceeds 2000 images by shooting several times, and in such a case, directories may be generated excessively. is there. That is, a plurality of images are recorded at the time of shooting, and the shooting mode based on the rewriting process of the recording unit (19) is used when a medium that cannot be rewritten such as a write-once recording medium is used. It is unsuitable. Therefore, an NG determination is made in the shooting mode determination (S403), a warning display (S404) such as “Cannot record” is displayed on the image display unit (14), and the shooting process (S206) is terminated (S408).

  Next, the recording process (S407) will be described with reference to FIGS. Here, FIG. 6 shows a file structure recorded on the recording medium 200 using the image recording apparatus.

When the recording process is started (S501), if the new directory number (M ′) recorded in the system memory (29) is larger than 0, a new file name is created using the maximum file number (m) (S507). . Here, when the new directory number (M ′) is less than 0, the type of the recording medium (200) determined in the recording medium determination process (S202) is referred to. (S503) As a result, in the case of a write-once recording medium (S505), the upper limit number of files that can be created in one directory (2000 in this embodiment) and the cluster size (CS) in which the recording unit (19) is formatted. The number of clusters (NC) required for the newly created directory is calculated using the following formula using the entry size (DS) specified by the file system (S505). It is assumed that the entry size DS corresponding to one file is 32 bytes.
NC = ROUNDUP (2000 / (CS / DS)).

  FIG. 8 shows the FAT configuration at this time. In case of FAT file system with cluster size CS = 16KB, NC = 4 is required to create 2000 files in 1 directory, and FAT is secured so that 4 consecutive clusters from 0x0B cluster to 0x0E cluster are secured on FAT. Record (801). In this manner, cluster chain information for securing a plurality of clusters based on the maximum number of files that can be recorded in one directory in a FAT is recorded.

  Note that the maximum number of files that can be recorded in one directory is not limited to the above-described 2000, and can be changed as appropriate depending on the design and the convenience of the standard. Needless to say, the number of clusters to be secured when a new directory is created must be changed according to the cluster size and entry size of the recording medium.

  On the other hand, when the recording medium (200) is a rewritable recording medium, one cluster is secured as the number of clusters of a newly created directory (S504). In the case of a FAT file system with a cluster size of 16 KB, two entries are consumed for the “.” And “..” directories, so the number of files that can be created with the directory entry secured in S504 is 510.

  FIG. 7 shows the FAT configuration at this time. In this case, only one cluster of 0xB is secured (701).

  A directory is created with the number of clusters secured according to the type of the recording medium (200) (S506). Subsequently, the file name of the photographed image data created by the development process (S406) is created using the maximum file number m (S507).

  Next, when the recording medium (200) is a write-once recording medium in the recording medium determination process (S202), an entry area for creating a file entry is secured in the calculation in step 505. Then, file recording is performed using the newly created file name (S512), and the process ends (S513). On the other hand, in the case of a rewritable recording medium (S508), if it is determined that a new file needs to be recorded in a new cluster (S509), the number of clusters is set to 1 as a cluster to be added (S510), and the directory is expanded. (S511). A case where “/ DCIM / 101IMAGE / IMG — 0511.JPG” is created will be described as an example. The entry corresponding to “IMG — 0510.JPG” recorded in the recording medium 200 immediately before is consumed up to the cluster 0x0208, and the cluster (0x0B) secured in S504 is consumed by the directory entry. Therefore, in order to create the “IMG — 0511.JPG” file, it is necessary to newly assign a cluster for the directory. The file management unit 20 performs this directory expansion (S511) using the smallest number 0x0209 cluster from the FAT free clusters. At this time, the end code 0xFFFF of the 0x0B cluster is rewritten to the newly assigned 0x0209 cluster number, and the FAT cluster chain is updated. Since the number of clusters allocated for expansion is determined to be 1 in S510, the 0x0209 cluster is recorded with the termination code 0xFFFF and the FAT is recorded so as to be 702. It is assumed that 0x0209 cluster allocated as it is is recorded up to “IMG — 1022.JPG” and the cluster is consumed up to 0x0406. Similarly, when “IMG — 1023.JPG” is recorded in this state, the termination code of the 0x0209 cluster is changed to 0x0407 in S510, and the directory is expanded by recording the termination code for the 0x0407 cluster (703). Further, the still image recording is continued, and when the “IMG — 1533.JPG” is created, the directory is expanded again using the 0x0605 cluster (704). As described above, when the recording medium 200 is a rewritable recording medium, it is possible to create 2000 files in the 101IMAGE directory by consuming one cluster at a time when expanding the directory and minimizing the consumption of the cluster. It is possible to suppress.

  On the other hand, when the recording medium 200 is a write-once recording medium, the cluster rewriting process on the FAT cannot be performed, and a plurality of clusters corresponding to the number of shootable images are secured in advance when creating a directory.

  If the new file can be recorded without directory extension (S509), the image data stored in the memory (30) is recorded as it is (S512), and the recording process is terminated (S513).

  In the above embodiment, the digital camera that handles image files has been described. However, any file system that handles FAT can be applied to a file recording apparatus that handles data files other than image files.

  In particular, in an apparatus in which an upper limit is set for the number of files recorded in one directory, the upper limit for the number of non-data files that can be recorded in one directory can be guaranteed when a rewritable recording medium is used. .

  FIG. 9 shows a flow when the sound recording process (S208) is performed using the recording button (31). If the voice recording process (S208) is executed, the number of files in the DCF directory cannot be guaranteed, so the write-once recording medium (S502) limits voice recording. At this time, a warning message such as “Cannot record” is displayed on the image display section (14) (S506). On the other hand, in the case of a rewritable recording medium, an audio recording file name is generated using the maximum directory number (M) and the maximum file number (m) (S503), and until the end of recording (S505), the audio is recorded (S504). ). When the recording end instruction is received, the recording process is ended (S507).

(Other examples)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

  Further, the program code read from the computer-readable storage medium realizes the functions of the above-described embodiments, so that the program code and the storage medium storing the program code constitute the present invention.

Claims (7)

A file recording apparatus for recording a data file on a recording medium using a FAT file system,
A mounting portion for mounting the recording medium;
Determination means for determining whether the recording medium mounted on the mounting portion is a write-once recording medium or a rewritable recording medium;
An area for recording entries corresponding to files to be recorded in a plurality of predetermined clusters when a new directory is generated when the determination unit determines that the medium is a write-once type recording medium. If the determination unit determines that the recording medium is a rewritable recording medium, when a new directory is generated, one cluster is set in an area for recording an entry corresponding to a file to be recorded in the directory. A file recording apparatus comprising: a recording unit that records the FAT so as to be allocated.   When the determination unit determines that the recording medium is a rewritable recording medium, the recording unit adds a FAT so as to add a new cluster to the cluster allocated to the directory with the addition of the data file to be recorded. The data recording apparatus according to claim 1, wherein the data recording apparatus is updated.   An upper limit is set for the number of data files that can be recorded in one directory. When the determination unit determines that the file is a write-once recording medium, the upper limit number of data files can be recorded. 3. The data recording apparatus according to claim 1, wherein the number of clusters when a directory is newly created is set. The data recording device is a digital camera;
If the determination means determines that the recording medium is a write-once recording medium, the control means further controls to prevent shooting in a shooting mode in which a plurality of image files are generated and recorded on the recording medium in one shooting. The file recording apparatus according to claim 1, wherein the file recording apparatus is provided. A method for controlling a file recording apparatus that has a mounting unit for mounting the recording medium and records a data file on the recording medium using a FAT file system,
A determination step of determining whether the recording medium mounted on the mounting portion is a write-once recording medium or a rewritable recording medium;
An area for recording an entry corresponding to a file to be recorded in a plurality of predetermined clusters when a new directory is generated when it is determined as a write-once type recording medium by the determination step. If the directory is determined to be a rewritable recording medium in the determination step, when a new directory is generated, one cluster is set as an area for recording an entry corresponding to a file recorded in the directory. And a recording step of recording the FAT so as to be assigned. A program for executing a file recording method for recording a data file on a recording medium using a FAT file system by being read and executed by a computer, the file recording method comprising:
A determination step of determining whether the recording medium on which the data file is recorded is a write-once recording medium or a rewritable recording medium;
An area for recording an entry corresponding to a file to be recorded in a plurality of predetermined clusters when a new directory is generated when it is determined as a write-once type recording medium by the determination step. If the directory is determined to be a rewritable recording medium in the determination step, when a new directory is generated, one cluster is set as an area for recording an entry corresponding to a file recorded in the directory. And a recording step of recording the FAT so as to be allocated.   A computer-readable recording medium storing the program according to claim 6.

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