JP2007042089A - File recording method, file recording apparatus and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend the life of an information medium by avoiding concentration of rewriting of management information of a file system on a storage area while maintaining compatibility with an existing file system regardless of hardware configuration or software configuration of the file system of the information medium. <P>SOLUTION: In the file recording method on the information medium 100 including at least both a specific area 102 and a data area 103, a reserved area 134 is allocated previously as a part of a recording file, from a current recording location of the recording file 130 under recording on the data area, at the same time, management information of the recording file 130 including the reserved area 134 is recorded on the specific area 102 and when recording data additionally on the recording file 130, the data are recorded on the reserved area from the recording location 131. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a file recording method, a file recording apparatus, and a program for an information medium, and more particularly to a technique for extending the life of an information medium during file recording using a file system.

  In a recording apparatus that records information on an information medium such as a hard disk, an optical disk, or a flash memory, the information is recorded in a recording area on the information medium, or the information is deleted when the information is no longer needed, so that the other information is stored in the area. It can be reused as an area for recording. In such a recording apparatus, a file system is generally used to facilitate management of information. By using the file system, the recorded information can be managed as a file and a directory hierarchy can be constructed. File systems include FAT (File Allocation Table) used in personal computers and UDF (Universal Disk Format) used in DVD (Digital Versatile Disk) and the like. When the file system is introduced, management information such as position information for making it easy to access the actual data is recorded on the information medium in addition to the actual data recorded on the information medium.

  Here, the management information in the file system is often concentrated in a specific part of the information medium. For example, FAT management information is recorded in the vicinity of the top portion on the logical address of the information medium. Personal computers are well known as devices equipped with file systems, but in recent years they have also been installed in video devices such as video cameras.

  A conventional file recording apparatus will be described below.

  An in-vehicle camera system will be described as an example of a device equipped with a file recording device. The in-vehicle camera system is roughly composed of a camera unit and a main unit that can record a video signal photographed by the camera unit on an information medium such as a memory card, which are used by connecting them with a cable or the like. The file recording device is incorporated in the main unit. In general, an in-vehicle camera system is a system capable of continuous recording for several hours. Therefore, the number of accesses to the information medium is very large.

  FIG. 12 is a block diagram showing a hardware configuration of a conventional file recording apparatus.

  12, the file recording apparatus 40 includes a control unit 41, a media controller 45, an encoder 46, an analog-digital conversion unit (hereinafter referred to as an AD conversion unit) 47, and an interface 48. The control unit 41, the media controller 45, and the encoder 46 are connected to the bus. The camera 20 is connected to the file recording device 40, and captured video and audio are input to the file recording device 40. Further, the information medium 100 can be attached to and detached from the file recording apparatus 40.

  The control unit 41 stores a central processing unit (hereinafter referred to as a CPU) 42 that performs signal processing, a memory 43 that temporarily stores work data when the CPU 42 performs signal processing, and a program. And a program storage unit 44. The CPU 42 and the program storage unit 44 are connected to a bus. The program storage unit 44 stores a program such as an operating system.

  The media controller 45 can exchange data and signals with the information medium 100 that can be attached to and detached from the file recording apparatus 40. For example, when the information medium 100 is composed of a memory card, a connector that is electrically connected to an electrical contact mounted on the memory card, a control circuit that performs recording / reproduction control of data on the memory card, etc. I have.

  The camera unit 20 is connected to the interface 48, and a video signal output from the camera unit 20 is input to the file recording device 40.

  The AD converter 47 converts a video signal (analog signal) input via the interface 48 into a digital video signal.

  The encoder 46 compresses the digital video signal output from the AD conversion unit 47 by a predetermined signal compression method. For example, the compression method is based on the MPEG4 standard (MPEG: Moving Picture Experts Group) capable of highly compressing moving images, but other compression methods may be used.

  The camera unit 20 incorporates an image pickup device such as a CCD image sensor, a lens, and the like, and converts an incident optical image into an electrical signal and outputs it. The operation of the camera unit 20 is controlled by the file recording device 40.

  In FIG. 12, an optical image taken by the camera unit 20 is converted into an analog video signal and output. The output analog video signal is input to the AD conversion unit 47 via the interface 48. The AD conversion unit 47 converts the input analog video signal into a digital video signal and outputs the digital video signal to the encoder 46. The encoder 46 compresses and outputs the input digital video signal in a predetermined compression format. The digital video signal is signal-processed by the CPU 42 and the memory 43 based on the OS stored in the program storage unit 44. Specifically, management information and a file are generated according to a predetermined file system. The generated management information and file are recorded on the information medium 100 via the media controller 45.

  FIG. 13 is a block diagram showing a software configuration of a conventional file recording apparatus. The configuration shown in FIG. 13 is incorporated in the control unit 41 in FIG. As illustrated in FIG. 13, a file generation unit 144 that generates a file based on image data output from the encoder 46 (see FIG. 12), and a management that generates management information related to the file generated by the file generation unit 144. An information generation unit 145.

  FIG. 14 is a diagram showing recorded contents of an information medium on which a file is recorded by a conventional file recording method in which a file system is introduced. In FIG. 14, the information medium 100 includes a specific area 102 and a data area 103 in order from the logical head address 101. The specific area 102 is an area in which management information in the introduced file system is recorded. The data area 103 is an area where actual data in the introduced file system is recorded.

  In the data area 103, for example, a recording file 130 composed of image data is recorded. In the data area 103, empty areas 132 and 133 exist in a portion where no recording file is recorded.

  A management area 120 exists in the specific area 102. In the management area 120, management information and the like are recorded. The management information is information including position information of an area secured by the recording file 130 in the information medium 100, for example. A free area 121 exists in a part where the management area 120 does not exist in the specific area 102.

  An arrow 122 indicates a correlation in which the management area 120 is updated corresponding to the end position of the recording file 130.

  FIG. 15A to FIG. 15C are diagrams showing changes in information medium contents by a conventional file recording method. 15A to 15C, information media 100a, 100b, and 100c are examples in which recording states of the information medium 100 are arranged in time series during file recording on the information medium 100 in FIG.

  In FIG. 15A, when data is additionally recorded in the recording file 130a recorded as shown in the drawing, the recording position 131a moves to a recording position 131b in FIG. 15B and a recording position 131c in FIG. 15C. That is, the end position of the recording file 130 moves in the direction in which the file size increases. Then, the management information in the management area 120 is always updated by the management information generation unit 145 in accordance with the correlation arrows 122a, 122b, and 122c. That is, on the information medium 100, rewriting to the management area 120 is often concentrated by the file system 143.

In such a case, in an information medium (for example, an optical disk or a flash memory) having a physical upper limit on the number of data rewrites, local deterioration occurs due to concentration of rewrites to the management area 120, and information There is a problem that the life of the medium is shortened. There is a method for avoiding such a problem by the hardware configuration of the information medium. For example, in a flash memory, a wear leveling function for averaging the number of rewrites is known. Another method is realized by the software configuration of the information medium. For example, there is a method in which a size larger than the size of the management information is secured in advance in the storage area of the management information of the file system, and the number of management information rewrites is averaged in the reserved area (see Patent Document 1).
JP 2004-79125 A

  However, the above-described realization method using the hardware configuration has a problem that the average number of rewrites cannot be realized at all or only partially due to the standard, material, and configuration of the information medium to be used. For example, in the case of an information medium in which the entire area is divided into a plurality of blocks and the averaging is limited within each block unit, the number of rewrites within each block is averaged, but the number of rewrites between each block is Not averaged. That is, there is a possibility that the number of times of rewriting increases only for a specific block including the management area.

  In addition, the above-described implementation method based on the software configuration has a problem that compatibility with an existing file system that is widely used in general cannot be maintained because of a special recording method and management method.

  The present invention has been made to solve the above-described problems, and maintains compatibility with an existing file system regardless of the hardware configuration of the information medium and the software configuration of the file system of the information medium. However, an object of the present invention is to provide a file recording apparatus that avoids the concentration of rewriting of management information of a file system in a storage area and realizes a long life of an information medium. It is another object of the present invention to provide a file recording method suitable for such a file recording apparatus. It is another object of the present invention to provide a program that can realize such a file recording method.

  In order to solve the above-mentioned problem, a first method of the file recording method of the present invention is the information recording medium including at least a specific area in which management information can be recorded and a data area in which a file can be recorded. A file recording method capable of recording a file, wherein a reserved area having a predetermined size continuous from a current recording position of a file being recorded in the data area is secured in a part of the file, and the reserved area is When the management information of the file is recorded in the specific area and data is additionally recorded in the file, the recording is started from the recording position and the data is recorded in the reserved area.

  Further, the second method of the file recording method of the present invention is capable of recording the management information and the file on an information medium including at least a specific area where the management information can be recorded and a data area where the file can be recorded. In the file recording method, the management information when a reserved area having a predetermined size continuous from the current recording position in a file being recorded in the data area is secured in a part of the file is stored in the specific area. By recording the data, the virtual reserved area of the predetermined size continuous from the recording position is secured, and when data is additionally recorded in the file, the data is recorded from the recording position to the virtual reserved area. Is.

  The first configuration of the file recording apparatus of the present invention is capable of recording the management information and the file on an information medium including at least a specific area where the management information can be recorded and a data area where the file can be recorded. A file recording apparatus that generates the management information and the file from data input from the outside, and records the management information and the file output from the control unit on the information medium. A recording control unit that generates a file to be recorded in the data area of the information medium, and generates management information related to the file generated by the file generation unit. A management information generating unit, a reserved area securing unit for securing a reserved area composed of continuous data from the current recording position of the file, and the reserved area Those having a size calculating unit that calculates the size of the reserved area coercive portion is ensured.

  In addition, the second configuration of the file recording apparatus of the present invention can record the management information and the file on an information medium including at least a specific area where the management information can be recorded and a data area where the file can be recorded. A file recording apparatus that generates the management information and the file from data input from the outside, and records the management information and the file output from the control unit on the information medium. A recording control unit that generates a file to be recorded in the data area of the information medium, and generates management information related to the file generated by the file generation unit. A management information generating unit, and a reserved area of a predetermined size continuous from a current recording position in a file being recorded in the data area; Recording the management information in the case of securing in a specific area, recording the reserved area securing unit that secures the virtual reserved area of the predetermined size continuous from the recording position, and calculating the size of the virtual reserved area A size calculating unit.

  According to the file recording method of the present invention, it is possible to avoid the concentration of rewriting of the management information of the file system in the storage area and to extend the life of the information medium.

  In addition, since the process for securing the reserved area or the virtual reserved area is performed by a general access method to the file system, compatibility with the existing file system can be maintained.

  In the file recording method of the present invention, the reservation timing of the reserved area or the virtual reserved area is determined based on the overall size of the file being recorded, the free size of the data area on the information medium, the reserved area or the virtual reserved area. Is determined based on at least one of the remaining size, the time from the start of recording of the file being recorded, and the timing at which the recording position of the file reaches one or more logical address boundaries of the information medium. It is good also as a method.

  Further, in the file recording method of the present invention, the reserved size of the reserved area or the virtual reserved area is the total size of the file being recorded, the remaining size of the reserved area or the virtual reserved area, the size of the file being recorded At least one of the time from the start of recording, the free size of the data area on the information medium, one or more logical address boundaries of the information medium, the file name of the file, and the data bandwidth of the file A method that correlates to one may be used.

  The file recording method of the present invention may be a method in which the reserved area or the virtual reserved area is deleted at the end of recording of the file.

  Further, in the file recording apparatus of the present invention, the reserved area or the virtual reserved area securing timing in the reserved area securing unit is the total size of the file being recorded, the free size of the data area on the information medium, Among the remaining size of the reserved area or the virtual reserved area, the time from the start of recording of the file being recorded, and the timing at which the recording position of the file reaches one or more logical address boundaries of the information medium, It is good also as a structure determined based on at least any one.

  Further, in the file recording apparatus of the present invention, the size calculation unit includes the entire size of the file being recorded, the remaining size of the reserved area or the virtual reserved area, the time from the start of recording of the file being recorded, The reserved area based on at least one of the free size of the data area on the information medium, one or more logical address boundaries of the information medium, the file name of the file, and the data bandwidth of the file Or it is good also as a structure which calculates the reservation size of the said virtual reservation area | region.

(Embodiment 1)
A file recording device is a device that converts input digital data into a file format and records the data on an information medium, and is also mounted on a personal computer, video equipment such as a video camera, and the like. In the present embodiment, an in-vehicle camera system will be described as an example of a device equipped with a file recording device. Of course, the present invention is not limited to the in-vehicle camera system.

  The in-vehicle camera system is composed of a camera unit that is mounted in a car and can capture a scene ahead of the traveling direction, and a main unit that can record an image captured by the camera unit on an information medium. The camera unit and the main unit are connected to each other via a cable or wireless communication, and can transmit and receive signals and data. The file recording device is incorporated in the main unit. In general, an in-vehicle camera system is a system in which continuous shooting for several hours is often performed, and thus the number of accesses to an information medium is very large.

  FIG. 1 is a block diagram illustrating a hardware configuration of the file recording apparatus according to the first embodiment.

  In FIG. 1, the file recording apparatus 10 includes a control unit 11, a media controller 15, an encoder 16, an analog-digital conversion unit (hereinafter referred to as an AD conversion unit) 17, and an interface 18. The control unit 11, the media controller 15, and the encoder 16 are connected to the bus. A camera 20 is connected to the file recording apparatus 10, and captured video and audio are input to the file recording apparatus 10. Further, the information medium 100 can be attached to and detached from the file recording apparatus 10.

  The control unit 11 stores a central processing unit (hereinafter referred to as a CPU) 12 that performs signal processing, a memory 13 that temporarily stores work data when the CPU 12 performs signal processing, and a program. And a program storage unit 14. The CPU 12 and the program storage unit 14 are connected to a bus. The program storage unit 14 is configured by a flash memory, for example, and stores a program such as an operating system (OS).

  The media controller 15 can exchange data and signals with the information medium 100 that can be attached to and detached from the file recording apparatus 10. For example, when the information medium 100 is composed of a memory card, a connector that is electrically connected to an electrical contact mounted on the memory card, a control circuit that performs recording / reproduction control of data on the memory card, etc. I have.

  A camera unit 20 is connected to the interface 18, and a video signal output from the camera unit 20 is input to the file recording apparatus 10.

  The AD converter 17 converts an analog signal input via the interface 18 into a digital video signal. The input analog signal is, for example, a composite video signal.

  The encoder 16 compresses the digital video signal output from the AD conversion unit 17 by a predetermined signal compression method. For example, there is a compression method that conforms to the MPEG4 (MPEG: Moving Picture Experts Group) standard capable of moving image compression, but other compression methods may be used.

  The camera unit 20 incorporates an image pickup device such as a CCD image sensor, a lens, and the like, and converts an incident optical image into an electrical signal and outputs it. The operation of the camera unit 20 is controlled by the file recording apparatus 10.

  The information medium 100 is detachable from the file recording device 10 and records various data in a file format. In this embodiment, the information medium 100 is configured by a memory card in which a semiconductor memory such as a flash memory is built. However, the information medium 100 may be a medium such as an optical disk or a hard disk, and corresponds to at least a file system such as FAT or UDF. Any medium may be used. Further, although the information medium 100 is a medium that can be attached to and detached from the file recording apparatus 10, it may be a medium that is fixed in the apparatus.

  In FIG. 1, an optical image taken by the camera unit 20 is converted into an analog video signal and output. The output analog video signal is input to the AD conversion unit 17 via the interface 18. The AD converter 17 converts the input analog video signal into a digital video signal and outputs the digital video signal to the encoder 16. The encoder 16 performs a compression process on the input digital video signal in a predetermined compression format. The compressed digital video signal is signal-processed by the CPU 12 and the memory 13 based on an operating system or the like stored in the program storage unit 14. Specifically, management information and a file are generated according to a predetermined file system. The generated management information and file are recorded on the information medium 100 via the media controller 15.

  In the above description, only video is recorded. However, only audio may be recorded, or both video and audio may be recorded.

  FIG. 2 is a block diagram illustrating a software configuration of the file recording apparatus according to the first embodiment. The configuration shown in FIG. 2 is incorporated in the control unit 11 in FIG. FIG. 3 is a schematic diagram showing recorded contents (logical structure) of the information medium.

  As illustrated in FIG. 2, the control unit 11 includes a size calculation unit 141, a reserved area securing unit 142, a file generation unit 144, and a management information generation unit 145.

  The size calculation unit 141 calculates the size of the reserved area 134 (see FIG. 3) reserved in the data area 103. The size of the reserved area 134 is the total size of the recording file 130 being recorded, the remaining size of the reserved area, the time from the start of recording of the recording file 130 being recorded, the free size of the data area 103 on the information medium 100, the information medium One or more logical address boundaries of 100, the file name of the recording file 130, and the data bandwidth of the recording file 130 are calculated so as to correlate with at least one of them.

  The reserved area securing unit 142 repeatedly secures the reserved area 134 having the size calculated by the size calculating unit 141 at a desired frequency. Specifically, the reserved area securing unit 142 designates the start address and the end address of the reserved area 134. Is. The reserved area 134 is secured from the recording file 130 being recorded, the total size of the data area 103 on the information medium 100, the remaining size of the reserved area 134, and the recording start of the recording file 130 being recorded. It is determined based on at least one of the time and the timing at which the recording position of the recording file 130 reaches one or more logical address boundaries of the information medium 100.

  The file generation unit 144 generates a file based on data output from the encoder 16 (see FIG. 1). The generated file is written into the data area 103 of the information medium 100 via the media controller 15.

  The management information generation unit 145 generates management information related to the file generated by the file generation unit 144. The generated management information is written into the specific area 102 of the information medium 100 via the media controller 15.

  Next, a logical structure in the information medium 100 will be described.

  FIG. 3 is a diagram showing a logical structure of an information medium on which a file is recorded by the file recording method according to the first embodiment.

  In FIG. 3, the information medium 100 includes a specific area 102 and a data area 103 in order from the logical head address 101.

  The specific area 102 is an area where management information and the like are recorded by the file system. In the specific area 102, a management area 120 in which management information is recorded is provided. The management information includes position information of the area of the recording file 130 secured on the data area 103. The free area 121 is a part of the specific area 102 where the management area 120 is not recorded.

  The data area 103 is an area where actual data (for example, video data) is recorded by the file system. The data area 103 includes a recording file 130, empty areas 132 and 133, and a reserved area 134. The recording file 130 recorded in the data area 103 includes actual data such as video data.

  A recording position 131 indicated by an arrow is the current recording position in the recording file 130. The recording position 131 fluctuates when the recording file 130 is recorded, when data is added to the recording file 130 or when the recording file 130 is deleted.

  The empty areas 132 and 133 are areas in the data area 103 where the recording file 130 is not recorded.

  The reserved area 134 is an area where, in the recording file 130, actual data has not yet been written, but reserved data for securing a write area in advance is written. In the present embodiment, the reservation data is composed of dummy data.

  In the data area 103, when a file is recorded on the information medium 100 or an already recorded file is deleted, the sizes of the recording file 130 and the free areas 132 and 133 increase or decrease.

  The correlation arrow 122 is an arrow indicating that the management area 120 is updated in accordance with the movement of the end position of the recording file 130.

  4A to 4C are diagrams showing changes in the contents of the information medium by the file recording method according to the first embodiment. When a file is recorded on the information medium 100, the information medium changes in the order of FIGS. 4A, 4B, and 4C. It shows a state. 4A to 4C, information media 100a, 100b, and 100c correspond to the information medium 100 in FIG. The specific areas 102a, 102b, and 102c correspond to the specific area 102 in FIG. The data areas 103a, 103b, and 103c correspond to the data area 103 in FIG. The management areas 120a, 12b, and 120c correspond to the management area 120 in FIG. The empty areas 121a, 121b, and 121c correspond to the empty area 121 in FIG. The recording files 130a, 130b, and 130c correspond to the recording file 130 in FIG. The empty areas 132a, 132b, and 132c correspond to the empty area 132 in FIG. The empty areas 133a, 133b, and 133c correspond to the empty area 133 in FIG. The reserved areas 134a, 134b, and 134c correspond to the reserved area 134 in FIG.

  FIG. 5 is a flowchart showing a file recording processing procedure in the first embodiment.

  In FIG. 5, step 200 is a process of executing a normal file system function (open) and newly creating and opening a recording file in the write mode.

  Step 201 is a process for updating the management area 120 when a new recording file is created in Step 200.

  Step 210 is a process of checking the remaining amount of the reserved area 134 before performing the data writing process and determining whether it is necessary to secure a new reserved area. Immediately after the file is opened, the remaining amount of data in the reserved area 134 is 0 (no actual data is recorded in the reserved area 134). If it is necessary to secure a reserved area in step 210, the process proceeds to step 211 to secure a reserved area. If it is not necessary to secure a reserved area, the process proceeds to step 202.

  Steps 211 to 215 are processes performed when it is determined in step 210 that a new reserved area needs to be secured. Step 211 is a process of storing the recording start position of the current file. Step 212 is a process for calculating the size of a reserved area to be newly secured. In step 213, a write process, which is a function of a normal file system, is executed, and dummy data (for example, data consisting of all “00”, all For example, data composed of “FF”. Step 214 is a process for updating the management area 120 when a new reserved area is recorded. Step 215 is processing for executing the seek process, which is a function of a normal file system, and returning the writing position of the recording file 130 to the recording start position stored in step 211.

  Step 202 is a process for recording the original data by executing a write process which is a function of a normal file system. Step 204 is a process in which the file system automatically moves the data recording start position by the process of Step 202. Step 205 is a process for determining whether or not the data recording is completed. If it is determined in step 205 that recording is not completed, the process returns to step 210. Step 206 is a process for updating a management area (such as a directory entry) due to the completion of writing of the recording file. Step 207 is a process for executing a close process, which is a function of a normal file system, and closing the recording file.

  The operation will be described below with reference to FIGS.

  First, in FIG. 1, the data input from the camera unit 20 to the data recording apparatus 10 is assumed to be data including at least one of video data and audio data obtained by sampling real-time video and audio and digitizing the data. is doing. In general, such data recording has a feature that transfer of a certain data bandwidth continues for a long time.

  The information medium 100 is formatted by a file system and managed in units of sectors. As shown in FIG. 3, the file system manages the information medium 100 by locally providing a management area 120 on the information medium 100. Specific examples of the information medium 100 include an optical disk and a flash memory. Many of these information media 100 are generally removable from the file recording apparatus 10 and are excellent in data portability and storage. On the other hand, many of these information media have a rewritable life. When the information medium 100 reaches the rewrite life, the information medium becomes unusable and needs to be replaced with a new information medium, resulting in an increase in running cost. Also, if real-time data recording fails as described above, recovery is usually difficult.

  In the file recording apparatus 10, when recording data as the recording file 130 on the data area 103 of the information medium 100, the reserved area securing unit 142 (see FIG. 2) secures the reserved area 134 at the end of the recording file 130. (See FIG. 3).

  Here, a case where data is additionally recorded in the recording file 130, that is, a case where the recording content of the information medium 100 changes from the content shown in FIG. 4A to the content shown in FIG. 4B will be described.

  When the file generation unit 144 shown in FIG. 2 performs additional recording of data on the recording file 130a (step 202 in FIG. 5), the file generation unit 144 executes a write process that is a function of a normal file system. . Then, the additionally recorded data is recorded on the reserved area 134a with the current recording position 131a shown in FIG. 4A as the head. As a result, the recording position 131a of the recording file 130a moves to the position indicated by the recording position 131b as shown in FIG. 4B, and the reserved area 134 decreases accordingly (step 204 in FIG. 5). At this time, the reserved area 134a of the recording file 130a is reduced by a size corresponding to the added data as shown in the reserved area 134b shown in FIG. 4B, but the end of the recording file 130a including the reserved area 134a shown in FIG. 4A. The position and the end position of the recording file 130b including the reserved area 134b shown in FIG. 4B are kept constant, and no new sector allocation to the file 130 occurs. Therefore, it is not necessary to update the management area 120b.

  Next, the case where the content of the information medium 100 changes from the content shown in FIG. 4B to the content shown in FIG. 4C will be described.

  Due to the additional recording of data by the file generation unit 144 (step 202 in FIG. 5), the recording position 131b of the recording file 130b shown in FIG. 4B is moved to the recording position 131c of the recording file 130c shown in FIG. 4C (step in FIG. 5). 204).

  At this time, the reserved area 134b is used up, and a shortage occurs with respect to the size corresponding to the data to be additionally recorded (when it is determined in step 210 in FIG. 5 that the remaining size of the reserved area is 0). ). In this case, the reserved area securing unit 142 secures a new reserved area 134c based on the size calculated by the size calculating unit 141 shown in FIG. 2 (from step 211 to step 213 in FIG. 5).

  Specifically, in step 211, the reserved area securing unit 142 stores the current file write start position 131c. Next, in step 212, the size calculation unit 141 calculates the size of the reserved area to be newly secured. Next, in step 213, the reserved area securing unit 142 executes a write process that is a function of a normal file system, and the recording file 130 is dummy-sized by the size of the new reserved area 134c from the current recording position 131c. Data (for example, all “00” data, all “FF” data, etc.) are recorded.

  Thus, by newly securing the reserved area 134c, the end position of the recording file 130b including the reserved area 134b and the end position of the recording file 130c including the reserved area 134c are changed. At this time, the management information generation unit 145 updates the management area 120c in the specific area 102 (step 214 in FIG. 5). At this time, since the current recording position is immediately after the reserved area 134c, a seek process, which is a function of a normal file system, is executed, and the writing position of the recording file is recorded at the recording position 131c (originally stored in step 211). To the recording start position of the recording data (step 215 in FIG. 5). In this way, by executing the processing of steps 211 to 215, the reserved area 134 of a predetermined size continuous from the current recording position 131c is made a part of the recording file 130 without changing the current recording position. Can be secured.

  Thereafter, the update of the management area 120c due to the additional recording of data can be suppressed until the newly reserved reservation area 134c is used up again.

The size calculation unit 141 in FIG. 2 can calculate the size of the reserved area to be secured at once from the data bandwidth of the data and the frequency (interval) of securing the reserved area. Here, it is assumed that the data bandwidth is always constant for all recording data, and is managed in advance by the size calculation unit 141. Further, the frequency of securing the reserved area is calculated based on the rewriting life that the information medium 100 needs to secure. At this time, for example, when the data bandwidth of data is 1 megabit / second and the interval for securing the reserved area 134 (that is, the reserved area securing interval) is 40 seconds, when data is recorded for 40 seconds at 1 megabit / second, the data is recorded. The size is
1 × 40/8 = 5 megabytes. Therefore, the size of the reserved area 134 calculated by the size calculator 141 is 5 megabytes.

  Further, the reservation area 134 is secured in the recording file 130 repeatedly by the reservation area reservation unit 142 at every reservation area reservation interval. In addition, the size of the reserved area at this time is not less than the size calculated by the size calculation unit 141. In step 210 of FIG. 5, the reserved area securing unit 142 operates to secure a new reserved area 134 at a timing when the remaining amount of the reserved area 134 is insufficient. For example, in the above example, a new reserved area 134 of 5 megabytes is secured every 40 seconds.

  As described above, in the file recording method according to the first embodiment, the update frequency of the management area 120 is significantly reduced by ensuring a sufficiently large size of the reserved area 134 with respect to the processing unit size of additional data recording. It becomes possible. That is, in a file system in which management information is locally managed, it is possible to avoid the concentration of rewriting of the management information in the storage area and to extend the life of the information medium 100.

  Further, since the process of securing the reserved area 134 is performed by a general access method to the file system as shown in step 213, the existing file system can be used as it is. Therefore, compatibility can be ensured.

  Since the file recording apparatus 10 can determine and secure the reserved size of the reserved area 134 suitable for the nature of the recording file 130, the data can be any data such as text data, still image data, program data, etc. It may be.

  The information medium 100 may be fixed to the file recording device 10 or may be separated from the file recording device 10. When separated separately, the information medium 100 and the file recording device 10 can be connected to each other by a wired cable or wireless communication, or the information medium 100 can be attached to a terminal mounted on the file recording device 10 It may be a form.

  Further, the file recording apparatus 10 can access the information medium 100 via an existing file system. Accordingly, one or more files other than the recording file 130 may exist in the data area 103, and one or more files being recorded by the recording method according to the present embodiment at the same time as the recording file 130. May exist.

  Further, the recording file 130 only needs to maintain continuity on the file system, and the physical arrangement on the data area 103 may be in a divided state.

  Further, the recording position 131 may be moved in the direction in which the recording file 130 increases on the file system, and the movement direction of the physical position on the information medium 100 may be changed.

  The reserving timing of securing the new reserved area 134 is determined by the reserved area securing unit 142 acquiring the recorded size of the recording file 130 at that time directly or indirectly from the file system 143 and correlating it with the size. Also good. For example, if the recorded size of the recording file 130 is less than 1 megabyte, the reserved area 134 is not secured, and if the recorded size exceeds 1 megabyte, the reserved area 134 of 5 megabytes is secured. Thereafter, every time the recorded size of the recording file 130 increases by 5 megabytes, the reserved area is correlated with the reserved area securing unit 142 so that the reserved area 134 of 5 megabytes is secured. In this case, it is possible to avoid securing an unnecessary reserved area for a file that is always small in size.

  Further, the reservation timing of securing the new reserved area 134 may be correlated with the time when the reserved area securing unit 142 counts the time from the start of recording directly or indirectly. For example, when recording of a plurality of recording files 130 is started at the same time, correlation is made to the reserved area securing unit 142 so that the timing of securing reserved areas 134 in the respective recording files is shifted in time. In this case, there is an effect that the reservation of the reserved areas 134 in the plurality of recording files 130 can be avoided from being concentrated at one time, and the processing load can be distributed.

  In addition, the reserving timing of securing the new reserved area 134 is such that the reserved area securing unit 142 acquires the end position of the recording file and the current writing position from the file system 143 directly or indirectly, It may be correlated with the remaining size. For example, when video data compressed at a variable rate is recorded as the recording file 130, the amount of data per unit time varies depending on the content of the video, so the size of one write to the recording file 130 may vary each time. is there. At this time, assuming that the maximum size width of the change is 1 megabyte, the reservation area securing unit 142 is correlated so that a new reserved area 134 is secured every time the remaining size of the reserved area 134 becomes 1 megabyte or less. In this case, it is possible to divide the data unit of one write size and make it unnecessary to secure a new reserved area, which has the effect of increasing the efficiency of the securing process.

  In addition, the reservation area securing unit 142 obtains the size of the free areas 132 and 133 that are the remaining size of the data area 103 directly or indirectly from the file system 143, and repeats the securing timing of the new reserved area 134. It may be correlated with the sum. For example, the reserved area reservation unit secures the reserved area 134 at a fixed timing every time when the free area is 50 megabytes or more, and prevents the reserved area 134 from being reserved when the free area becomes less than 50 megabytes. 142. By operating in this way, there is an effect that a reserved area is secured even when the free area is small, and an area required for another file cannot be secured.

  Alternatively, the reserving timing of securing the new reserved area 134 is such that the reserved area securing unit 142 acquires the recording position 131 of the recording file 130 directly or indirectly, and that position is one of the information media 100 after a certain time has elapsed. It may be when a plurality of logical address boundaries are reached. For example, in the case of a file system, the file 130 is managed in units of blocks or clusters each consisting of a set of a plurality of sectors. Therefore, when accessing the information medium 100 in correlation with the logical address boundary, the access speed is improved. There is an effect that can be expected.

  That is, it is only necessary to correlate with one or a plurality of events that can be repeated periodically or periodically.

  Further, the size of the newly reserved area 134 may always be a constant size.

  Further, the size of the reserved area 134 to be newly secured is obtained by the size calculation unit 141 directly or indirectly acquiring the recorded size of the recording file 130 being recorded from the file system 143 and correlating it with the size. Also good. For example, when the recorded size of the recording file 130 is less than 1 megabyte, the reserved size of the reserved area 134 is set to zero. In the case of 1 megabyte or more and less than 5 megabytes, the reserved area 134 has a reserved size of 1 megabyte. In the case of 5 megabytes or more, the reserved size of the reserved area 134 is 5 megabytes. In this way, the size of the reserved area 134 is correlated with the size calculation unit 141. In this case, if the size of the recording file 130 is always small, the reserved area 134 is not secured, and the reserved area 134 of up to 5 megabytes is secured for a file whose recording file 130 size increases relatively slowly. For example, the reserved area can be secured according to the characteristics of various recording files.

  Further, the size of the newly reserved area 134 may be correlated with the size calculation unit 141 by counting the time from the start of recording directly or indirectly. For example, when the time from the start of recording of the recording file 130 is less than 10 seconds, the reserved size of the reserved area 134 is set to zero. In the case of 10 seconds or more and less than 5 minutes, the reserved area 134 is secured to 1 megabyte. In the case of 5 minutes or more, the reserved size of the reserved area 134 is 5 megabytes. In this way, the size of the reserved area 134 is correlated with the size calculation unit 141. In this case, when the recording time of the recording file 130 is always short, the reserved area 134 is not secured, and when the recording of the recording file 130 is continued for a long time, the reserved area 134 of up to 5 megabytes is stored. For example, the reserved area can be secured according to the characteristics of various recording files.

  In addition, the size of the newly reserved area 134 is correlated with the size calculation unit 141 by directly or indirectly acquiring the data bandwidth and calculating the frequency (interval) at which the reserved area 134 is reserved. May be. For example, when recording video data compressed at a variable rate as the recording file 130, the application software dynamically specifies the frequency of securing the variable rate data bandwidth and the reserved area to the size calculation unit 141 using parameters. Enable and correlate to them. In this case, there is an effect that a size suitable for the designated variable rate can be dynamically secured.

  In addition, the size of the reserved area 134 to be newly secured is obtained by the size calculation unit 141 directly or indirectly acquiring the end position of the recording file and the current writing position from the file system 143, and the difference of the reserved area 134 that is the difference between them. It may be correlated with the remaining size. For example, when video data compressed at a variable rate is recorded as the recording file 130, the amount of data per unit time varies depending on the content of the video, so the size of one write to the recording file 130 may vary each time. is there. At this time, in order to perform the timing for newly securing the reserved area 134 at regular intervals, the remaining size of the reserved area 134 immediately after the newly secured is always a constant size based on the difference from the remaining size of the reserved area 134. Correlate with the size calculator 141. In this case, since the timing for newly securing the reserved area 134 can be set at a constant interval, there is an effect that periodic design of processing and load distribution of processing are facilitated.

  The size of the reserved area 134 to be newly secured is obtained by the size calculation unit 141 acquiring the end position of the recording file 130 including the reserved area 134 directly or indirectly, and the information medium 100 after the position exceeds a certain size. It may be performed so as to be a logical address boundary. For example, in the case of a file system, since the file 130 is managed in block units or cluster units composed of a set of a plurality of sectors, when accessing the information medium 100 in correlation with the logical address boundaries, the access speed There is an effect that the improvement of can be expected.

  Alternatively, the size of the reserved area 134 to be newly secured may be determined by the size calculation unit 141 acquiring the file name or the file name extension of the recording file 130 directly or indirectly. For example, when “.AV” is used as the extension of the file name of the recording file of video data or audio data and “.TXT” is used as the extension of the text file, the newly secured size of the reserved area 134 Is determined to be 5 megabytes when the file name extension of the recording file 130 is “.AV”, and is determined to be 1 megabyte when it is “.TXT”. In this case, there is an effect that a reserved area having a size suitable for various recording files can be secured.

  In other words, it may be correlated with the current state of one or a plurality of events.

  In addition, the data bandwidth of the data may be managed in advance by the size calculation unit 141, or the file generation unit 144 may provide the size calculation unit 141 with the data bandwidth information included in the data 150 as a parameter. .

(Embodiment 2)
The file recording method according to the second embodiment is different from the file recording method according to the first embodiment in that unnecessary reserved areas are deleted at the end of data recording. Same as 1. The configuration of the file recording apparatus of the second embodiment is the same as that of the first embodiment, that is, as shown in FIGS.

  6A, 6B, and 6C are diagrams illustrating changes in the content of the information medium 100 by the file recording method according to the second embodiment. FIG. 6A shows an initial state. FIG. 6B shows a state in which data is added to the recording file 130. FIG. 6C shows a state in which the reserved area 134 has been deleted.

  6A to 6C, information media 100a, 100b, and 100c are arranged in chronological order as an example of recorded contents from when a file is recorded on the information medium 100 to when the file recording ends. The information medium 100a shows the contents in the middle of data recording. The information medium 100b shows the content immediately after the last data is recorded. The information medium 100c has contents after completion of the file recording end process. Other reference numerals correspond to those in FIG.

  FIG. 7 is a flowchart showing a file recording processing procedure in the second embodiment. 7 is different from the flowchart of FIG. 5 in that step 219 is added. Step 219 is a process of executing a truncate process that is a function of a normal file system, discarding data after the current position of the recording file, and truncating the data.

  The operation will be described below.

  First, the change in the recording content from the information medium 100a shown in FIG. 6A to the information medium 100b shown in FIG. 6B is the same as the case of the content change during file recording in the first embodiment, and thus the description thereof is omitted.

  Next, a change in the recording contents from the information medium 100b shown in FIG. 6B to the information medium 100c shown in FIG. 6C will be described. In FIG. 6B, the movement of the recording position (current position 131b) of the recording file 130b is stopped by completing the recording of the last data. In this case, there is a reserved area 134b after the current position 131b of the recording file 130b, and when the file recording is completed, the reserved area 134b is unnecessary. Therefore, the file generation unit 144 executes the truncate process, discards and truncates the data in the reserved area 134b after the current position 131b of the recording file (step 219 in FIG. 7).

  Here, by deleting the reserved area 134b, the end position (FIG. 6B) of the recording file 130b including the reserved area 134b changes as shown in the end position of the recording file 130c in FIG. 6C. Therefore, the management information in the management area 120c is updated as indicated by the correlation arrow 122c for the management area 120c (step 206 in FIG. 7).

  As described above, in the file recording method in the second embodiment, the file state after the file recording (see FIG. 6C) is the same as the file state when the file recording method in the present invention is not used.

  Further, since the process of securing the reserved area 134 is performed by a general access method to the file system as shown in step 213, the existing file system can be used as it is. Therefore, compatibility can be ensured.

(Embodiment 3)
The file recording method in the third embodiment is different from the file recording method in the first embodiment in that the size of the reserved area to be secured is adjusted when the remaining capacity of the information medium 100 is small. Other parts are the same as those in the first embodiment. The configuration of the file recording apparatus of the third embodiment is the same as that of the first embodiment and is as shown in FIGS.

  8A, 8B, and 8C are diagrams illustrating changes in the content of the information medium 100 according to the third embodiment. FIG. 8A shows an initial state. FIG. 8B shows a state where data is recorded in the reserved area 134. FIG. 8C shows a state where the reserved area 134 is added.

  8A to 8C, information media 100a, 100b, and 100c are arranged in chronological order as an example of recorded contents during file recording when the remaining capacity of the information medium 100 is very small. The recorded areas 135a, 135b, and 135c are areas where recording files other than the recording files 130a, 130b, and 130c are recorded in the data areas 103a, 103b, and 103c, respectively, and are newly used as reserved areas. It is an area that cannot be done. Other reference numerals correspond to those in FIG.

  The file recording process in the third embodiment is realized in the same manner as the file recording process in the first embodiment shown in FIG. 5, but the contents of step 212 are different from those in the first embodiment.

  The operation will be described below.

  First, the content change from the information medium 100a shown in FIG. 8A to the information medium 100b shown in FIG. 8B is the same as the case of the content change during file recording in the first embodiment, and a description thereof will be omitted.

  Next, the content change from the information medium 100b shown in FIG. 8B to the information medium 100c shown in FIG. 8C will be described. In FIG. 8B, due to the additional recording of data, the recording position 131b of the recording file 130b moves like the recording position 131c of the recording file 130c shown in FIG. 8C.

  At this time, the reserved area 134b is used up, and there is a possibility that the reserved area is insufficient for the size of data to be additionally recorded. In this case, a new reserved area is secured. However, as shown in FIG. 8B, there is a case where a sufficiently large reserved area cannot be secured because the free area 133b is very small. Further, if a reserved area corresponding to the size corresponding to the free area 133b is secured, the free area 133c disappears in the data area 103c, and it may be impossible to record any file other than the recording file 130c.

  Here, when the reserved area 134c is newly secured in a situation where the free area 133b is very small as shown in FIG. 8B, the size to be secured is adjusted so that the free area 133c remains as shown in FIG. 8C. Then, the size of the reserved area 134c is determined (step 212 in FIG. 5). As an example of the size determination at this time, a method of setting half the size of the free area 133b to the size of the reserved area 134c, etc. can be considered. Then, by newly securing the reserved area 134c, the end position of the recording file 130b including the reserved area 134b and the end position of the recording file 130c including the reserved area 134c change. At this time, the management area 120c is updated (step 214 in FIG. 5).

  As described above, in the file recording method according to the third embodiment, the size of the reserved area 134 is determined and secured in correlation with the size of the free area 133 of the data area 103, thereby affecting the recording of other files. Can be suppressed.

  In addition, since the general access method to the file system is used as a process for securing the reserved area whose size is adjusted, the existing file system can be used as it is. Therefore, compatibility can be ensured.

  Note that, in a situation where the free space 133b is very small, in order to apply the effect of extending the life of the information medium 100 in the embodiment to the maximum, the free space 133c does not leave a new reserved size of the reserved region 134c. You may decide. In order to simplify the reservation area reservation process, the new reservation size of the reservation area 134c may be set to zero.

(Embodiment 4)
The file recording method according to the fourth embodiment differs from the file recording method according to the first to third embodiments in that a reservation is made only in the management area instead of securing a reserved area by writing data in the data area. This is a point where an area is secured. That is, when it is assumed that a reserved area (a reserved area of a predetermined size continuous from the current recording position of the recording file) is secured in a part of the recording file, the management information is virtually recorded in the specific area, This reserves a reserved area. Since other parts are the same as those in the first to third embodiments, the description thereof is omitted.

  FIG. 9 is a diagram showing recorded contents of an information medium on which a file is recorded by the file recording method according to the fourth embodiment. In FIG. 9, a virtual reserved area 136 is an area where actual data has not yet been written in the recording file 130, and an area is allocated to the recording file 130 only on the management area 120 in order to secure a writing area. It is an area. Other reference numerals are the same as those in FIG.

  FIG. 10 is a diagram illustrating a software configuration of the file recording apparatus according to the fourth embodiment. In FIG. 10, a size calculation unit 148 calculates the size of a newly reserved virtual reserved area 136. The reserved area securing unit 147 repeatedly secures a virtual reserved area having the size calculated by the size calculating unit 148 at a desired frequency. The file generation unit 144 records data as a file on the data area 103 of the information medium 100. The management information generation unit 145 records file system management information in the management area 120 when a virtual reserved area is reserved by the reserved area reservation unit 147 and when the file generation unit 144 records a file. .

  FIG. 11 is a flowchart showing a file recording processing procedure in the fourth embodiment. In FIG. 11, differences from the flowchart shown in FIG. 7 will be described. In FIG. 11, steps 216 to 218 are processing performed when it is determined in step 210 that a new virtual reserved area needs to be secured. Step 216 is a process of calculating the size of a newly reserved virtual reserved area. Step 217 is a process for executing the truncate process and increasing the entire size of the recording file to a position obtained by adding the calculated virtual reserved area size to the current position of the recording file. Step 218 is a management area update process after securing a new virtual reserved area.

  Note that the truncate function of the file system increases only the entire size of the recording file when a position after the current position of the recording file is specified, and data for filling the increased area (all of “00”). Data, all “FF” data, etc.) are not written.

  The operation will be described below. The description will focus on the differences from the first to third embodiments.

  In the file recording apparatus 10, when recording data as the recording file 130 on the data area 103 of the information medium 100, the reserved area securing unit 147 secures the size calculated by the size calculating unit 148 on the management area 120. To do. Specifically, in step 217, the reserved area securing unit 147 issues a truncate command to increase the file size to a position after the current recording position 131 by the virtual reserved area size. At this time, since the data is not actually written to the information medium 100, the current recording position 131 does not move. In addition, since the file size increases, in step 218, the management information generation unit 145 updates the management area 120 according to the size. As a result, a virtual virtual reserved area 136 having a predetermined size is secured from the end of the recording file 130, that is, from the current recording position 131.

  Here, when data is additionally recorded in the recording file 130, the recording position 131 of the recording file 130 is moved by the additional data recording (step 202 in FIG. 11) by the file generation unit 144 (step 204 in FIG. 11). The virtual reserved area 136 of the recording file 130 is reduced by the size corresponding to the added data. However, the end position of the recording file 130 including the virtual reserved area 136 is kept constant, and a new virtual sector allocation to the file 130 does not occur. Therefore, it is not necessary to update the management area 120.

  Furthermore, when data is additionally recorded in the recording file 130, the virtual reserved area 136 is used up, and a shortage occurs with respect to the size corresponding to the data to be additionally recorded (step 210 in FIG. 11). In this case, the reserved area securing unit 147 secures the size newly calculated by the size calculating unit 148 on the management area 120 (steps 216, 217, and 218 in FIG. 11). As a result, a new virtual reserved area 136 is secured at the end of the recording file 130.

  As described above, in the file recording method according to the fourth embodiment, the reserved area is virtually reserved only on the management area 120. Therefore, the reserved area is created by actually writing data on the recording file 130 in the data area 103. The process of securing can be reduced.

  Since the recorded file is exactly the same as the file recorded by the normal access method in step 219, the existing file system can be used as it is for accessing the recorded file. Therefore, compatibility can be ensured.

  Note that the calculation of the reserved size of the virtual reserved area can be performed in the same manner as the calculation of the reserved size of the reserved area in the first to third embodiments.

  According to the present invention, it is possible to avoid the concentration of rewriting of the management information of the file system in the storage area and to extend the life of the information medium. Further, since a general access method to the file system is used as the process for securing the reserved area, the existing file system can be used as it is. Therefore, it is useful for a video recording device, an audio recording device, other data recording devices, etc. that use an optical disk, a flash memory, or the like as an information medium.

1 is a block diagram showing a hardware configuration of a file recording apparatus according to Embodiment 1; FIG. 3 is a block diagram showing a software configuration of the file recording apparatus in the first embodiment. Schematic diagram showing the configuration of an information medium according to the file recording method in the first embodiment FIGS. 8A to 8C are diagrams showing changes in the contents of an information medium according to the file recording method in the first embodiment. Flowchart showing file recording processing in the first embodiment FIGS. 8A to 8C are diagrams showing changes in contents of an information medium according to a file recording method in Embodiment 2. FIGS. Flowchart showing file recording processing in the second embodiment FIGS. 8A to 8C are diagrams showing changes in the contents of an information medium according to the file recording method in Embodiment 3. FIGS. Schematic diagram showing the configuration of an information medium according to a file recording method in Embodiment 4 Block diagram showing the software configuration of the file recording apparatus in the fourth embodiment Flowchart showing file recording processing in the fourth embodiment Block diagram showing the hardware configuration of a conventional file recording apparatus Block diagram showing the software configuration of a conventional file recording device Schematic diagram showing the configuration of an information medium according to a conventional file recording method FIGS. 8A to 8C are schematic diagrams showing changes in contents of an information medium by a conventional file recording method. FIGS.

Explanation of symbols

10 File Recording Device 11 Control Unit 12 CPU
13 Memory 14 Program storage unit 15 Media controller 16 Encoder 17 AD conversion unit 18 Interface 100 Information medium 101 Logical head address 102 Specific area 103 Data area 120 Management area 121 Free area (area other than management area)
130 Recording file 131 Recording position 132 Empty area (logical start address side)
133 Free space (logical tail address side)
134 Reserved area 141, 146 Size calculating unit 142, 147 Reserved area securing unit 144 File generating unit 145 Management information generating unit

Claims (10)

A file recording method capable of recording the management information and the file on an information medium including at least a specific area where the management information can be recorded and a data area where the file can be recorded,
Reserve a reserved area of a predetermined size continuous from the current recording position of the file being recorded in the data area in a part of the file,
Management information of the file including the reserved area is recorded in the specific area,
When data is additionally recorded in the file, recording is started from the recording position, and the data is recorded in the reserved area. A file recording method capable of recording the management information and the file on an information medium including at least a specific area where the management information can be recorded and a data area where the file can be recorded,
In the file being recorded in the data area, the management information when a reserved area having a predetermined size continuous from the current recording position is secured in a part of the file is recorded in the specific area, thereby recording the recording area. Secure a virtual reserved area of the predetermined size continuous from the position,
A file recording method, wherein when data is additionally recorded in the file, the data is recorded from the recording position to the virtual reserved area. The reservation timing of the reserved area or the virtual reserved area is as follows:
The total size of the file being recorded, the free size of the data area on the information medium, the remaining size of the reserved area or the virtual reserved area, the time from the start of recording of the file being recorded, the recording position of the file 3. The file recording method according to claim 1 or 2, wherein the file recording method is determined based on at least one of timings at which one or more logical address boundaries of the information medium are reached. The reserved area or the reserved size of the virtual reserved area is:
The total size of the file being recorded, the remaining size of the reserved area or the virtual reserved area, the time from the start of recording of the file being recorded, the free size of the data area on the information medium, one of the information media The file recording method according to claim 1, wherein the file recording method correlates with at least one of one or a plurality of logical address boundaries, a file name of the file, and a data bandwidth of the file.   5. The file recording method according to claim 1, wherein the reserved area or the virtual reserved area is deleted at the end of recording of the file.   A program for causing a computer to execute the file recording method according to any one of claims 1 to 5. A file recording apparatus capable of recording the management information and the file on an information medium including at least a specific area capable of recording management information and a data area capable of recording a file,
A control unit that generates the management information and the file from externally input data;
A recording control unit for recording the management information and the file output from the control unit on the information medium;
The controller is
A file generator for generating a file to be recorded in the data area of the information medium;
A management information generating unit that generates management information related to the file generated in the file generating unit;
A reserved area securing unit for securing a reserved area composed of continuous data from the current recording position of the file;
A file recording apparatus comprising: a size calculating unit that calculates a size of the reserved area secured by the reserved area securing unit. A file recording apparatus capable of recording the management information and the file on an information medium including at least a specific area capable of recording management information and a data area capable of recording a file,
A control unit that generates the management information and the file from externally input data;
A recording control unit for recording the management information and the file output from the control unit on the information medium;
The controller is
A file generator for generating a file to be recorded in the data area of the information medium;
A management information generating unit that generates management information related to the file generated in the file generating unit;
In the file being recorded in the data area, the management information when a reserved area having a predetermined size continuous from the current recording position is secured in a part of the file is recorded in the specific area, thereby recording the recording area. A reserved area securing unit that secures the virtual reserved area of the predetermined size continuous from the position;
A file recording apparatus comprising: a size calculating unit that calculates a size of the virtual reserved area. The reservation timing of the reserved area or the virtual reserved area in the reserved area securing unit is as follows:
The total size of the file being recorded, the free size of the data area on the information medium, the remaining size of the reserved area or the virtual reserved area, the time from the start of recording of the file being recorded, and the recording of the file 9. The file recording apparatus according to claim 7, wherein the position is determined based on at least one of timings at which the position reaches one or a plurality of logical address boundaries of the information medium. The size calculator is
The total size of the file being recorded, the remaining size of the reserved area or the virtual reserved area, the time from the start of recording of the file being recorded, the free size of the data area on the information medium, one of the information media 9. The reserved size of the reserved area or the virtual reserved area is calculated based on at least one of one or a plurality of logical address boundaries, the file name of the file, and the data bandwidth of the file. The file recording device described.

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