JP2008052767A - Recording device and recording method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress destruction of management information for managing data when power source is disconnected during recording of data. <P>SOLUTION: In a recording device, an initialization section 71 generates an empty file of size not less than the largest size assumed as a size of location data recorded on a location file prepared in a hard disk which has a data area for recording location data for each file, and a FAT (File Allocation Table) area which records a FAT entry which manages the location data as a location file of the location data. A recording processing section 72 makes the location data recorded in the location file. For example, it is applicable to a recording device which records the data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a recording apparatus, a recording method, and a program, and in particular, a recording apparatus and a recording capable of suppressing destruction of management information for managing data when the power is turned off during data recording. The present invention relates to a method and a program.

  If the power to the device is interrupted when recording a file in memory, the file will be destroyed because the file cannot be closed properly. For example, when the actual data of a file (hereinafter referred to as actual data) is recorded in the cluster and the power is interrupted, the impact is limited to that file, but the FAT (File Allocation Tables) entry is changed. If the power is interrupted while updating, the FAT area will be destroyed, so not only the file created at that time but all the files in memory will be destroyed and cannot be read.

  Therefore, a method of backing up FAT entries has been devised (see, for example, Patent Documents 1 to 3).

  By the way, in a device that records log data, etc. in one file at any time, each time a file is opened or closed each time it is recorded in a file, or when a file is opened and a cluster is added The FAT entry was updated.

JP 2005-063047 A

JP 09-319640 A

JP 2006-134123 A

  In this way, when logging data etc. is recorded in one file at any time, since writing to the FAT area is always performed, there is a high possibility that the FAT area will be destroyed and all the files in the memory will be destroyed. .

  The present invention has been made in view of such a situation, and makes it possible to suppress destruction of management information for managing data when the power is turned off during data recording. .

  The recording apparatus according to an aspect of the present invention provides the data in a file provided in the data area of a recording medium having a data area for recording data in file units and a management area for recording management information for managing the data. In the recording apparatus for recording the data, a generating unit that generates an empty file having a size equal to or larger than a maximum size assumed as a size of data recorded in the file as the data file; and Recording processing means for recording data.

  The recording apparatus according to one aspect of the present invention further includes a calculation unit that calculates a size of data recorded in the file, and a correction unit that corrects the size of the file to the size calculated by the calculation unit. Can do.

  The recording apparatus according to one aspect of the present invention further includes a determination unit that determines whether power is interrupted during the recording of the data, and the recording unit includes end information that is information indicating an end of the file. The data is recorded at the end of the data, and the calculating means calculates the size of the data recorded in the file based on the end information when the determining means determines that the power supply is interrupted during the data recording. can do.

  The recording apparatus according to one aspect of the present invention further includes a determination unit that determines whether or not a power source is interrupted during the recording of the data, and the calculation unit is configured to interrupt the power source during the recording of the data by the determination unit. If it is determined, the size of the data recorded in the file can be calculated based on the checksum of the data.

  The recording method according to one aspect of the present invention provides the data in a file provided in the data area of a recording medium having a data area for recording data in units of files and a management area for recording management information for managing the data. In the recording method of the recording apparatus for recording the file, an empty file having a size equal to or larger than a maximum size assumed as the size of data recorded in the file is generated as the data file, and the generated file is Recording data.

  According to another aspect of the present invention, there is provided a program for storing the data in a file provided in the data area of a recording medium having a data area for recording data in file units and a management area for recording management information for managing the data. In a program for causing a computer to perform a recording process, an empty file having a size greater than or equal to a maximum size assumed as the size of data recorded in the file is generated as the data file, and the generated file Recording the data.

  In one aspect of the present invention, data recorded in a file provided in the data area of a recording medium having a data area for recording data in file units and a management area for recording management information for managing the data An empty file having a size greater than or equal to the maximum size assumed as the data size is generated as the data file, and the data is recorded in the generated file.

  As described above, according to one aspect of the present invention, it is possible to suppress destruction of management information for managing data when the power is turned off during data recording.

  Embodiments of the present invention will be described below. Correspondences between the constituent elements of the present invention and the embodiments described in the specification or the drawings are exemplified as follows. This description is intended to confirm that the embodiments supporting the present invention are described in the specification or the drawings. Therefore, even if there is an embodiment which is described in the specification or the drawings but is not described here as an embodiment corresponding to the constituent elements of the present invention, that is not the case. It does not mean that the form does not correspond to the constituent requirements. Conversely, even if an embodiment is described here as corresponding to a configuration requirement, that means that the embodiment does not correspond to a configuration requirement other than the configuration requirement. It's not something to do.

A recording apparatus according to one aspect of the present invention includes:
A recording device (for example, FIG. 1) that records the data in a file provided in the data area of a recording medium having a data area for recording data in units of files and a management area for recording management information for managing the data. Recording device 10)
Generating means (for example, an initialization unit 71) for generating an empty file having a size equal to or larger than a maximum size assumed as the size of data recorded in the file, as the data file;
Recording processing means (for example, a recording processing unit 72) for recording the data in the generated file.

A recording apparatus according to one aspect of the present invention includes:
Calculation means for calculating the size of the data recorded in the file (for example, the end processing unit 73 in FIG. 3 that executes the process of calculating the size of the position file in step S21 in FIG. 6);
Correction means for correcting the size of the file to the size calculated by the calculation means (for example, the end processing unit 73 in FIG. 3 for executing the process of correcting the size of the position file in step S21 in FIG. 6).
Is further provided.

A recording apparatus according to one aspect of the present invention includes:
Determining means for determining whether the power supply is interrupted during the data recording (for example, the repair processing unit 74 in FIG. 3).
Further comprising
The recording means records end information, which is information indicating the end of the file, at the end of the data,
The calculation unit calculates the size of data recorded in the file based on the end information when the determination unit determines that the power supply is interrupted during the recording of the data.

A recording apparatus according to one aspect of the present invention includes:
Determining means for determining whether the power supply is interrupted during the data recording (for example, the repair processing unit 74 in FIG. 3).
Further comprising
The calculation means calculates the size of the data recorded in the file based on the checksum of the data when the determination means determines that the power supply is interrupted during the recording of the data.

A recording method according to one aspect of the present invention includes:
A recording apparatus (for example, FIG. 1) that records the data in a file provided in the data area of a recording medium having a data area for recording data in units of files and a management area for recording management information for managing the data. In the recording method of the recording apparatus 10),
An empty file having a size equal to or larger than the maximum size assumed as the size of data recorded in the file is generated as the data file (for example, step S2 in FIG. 4).
The data is recorded in the generated file (for example, step S11 in FIG. 5).
Includes steps.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration example of an embodiment of a recording apparatus 10 to which the present invention is applied.

  1 includes an antenna 11, an amplifier 12, a position data calculator 13, a controller 14, and an HDD (Hard Disk Drive) 15. For example, when the power of the recorder 10 is turned on, GPS (Global Positioning System) information is received from the satellite, and position data representing the current position of the recording device 10 is recorded based on the GPS information.

  The antenna 11 receives a radio wave of GPS information from a satellite and supplies it to the amplification unit 12. The amplifying unit 12 amplifies the radio wave of the GPS information supplied from the antenna 11 and supplies it to the position data calculating unit 13. The position data calculation unit 13 calculates position data based on the GPS information and supplies the position data to the control unit 14.

  The control unit 14 includes, for example, a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The CPU of the control unit 14 controls the entire recording apparatus 10 by executing a program loaded from the HDD 15 to the RAM. For example, the CPU of the control unit 14 supplies the HDD 15 with the position data supplied from the position data calculation unit 13 for recording. Further, the CPU of the control unit 14 reads the position data from the HDD 15 and outputs it to another device (not shown). The RAM of the control unit 14 appropriately stores data necessary for the CPU to execute various processes.

  The HDD 15 includes, for example, a hard disk 51 (FIG. 2 described later), and records position data supplied from the control unit 14 on the hard disk 51.

  FIG. 2 is a block diagram illustrating a functional configuration example of the CPU of the control unit 14 when writing and reading a position data file (hereinafter referred to as a position file) to and from the hard disk 51 built in the HDD 15. It is.

  The CPU of the control unit 14 includes an application program 31 and an operating system (hereinafter referred to as OS) 32. The OS 32 includes at least a file system 41 and a device driver 42.

  The application program 31 executes various processes and requests the operating system 32 to record and read the position file. The operating system 32 is a so-called basic program, and controls the handling of resources such as hardware of the recording apparatus 10, for example.

  The file system 41 is, for example, a FAT file system (FAT16, FAT32), and manages data recorded on the hard disk 51 in units of clusters. The device driver 42 controls recording of data on the hard disk 51 or reading of data recorded on the hard disk 51.

  The application program 31 requests (instructs) access (reading or writing) in file units (levels) to the file system 41 of the OS 32.

  The file system 41 manages files in cluster units, and when an access to the location file is requested from the application program 31, the file system 41 searches for a cluster corresponding to the location file (hereinafter referred to as the relevant cluster). For example, when the application program 31 requests the file system 41 to read a location file, the file system 41 searches for a cluster in which location data that is actual data of the location file is recorded as a corresponding cluster. . Also, for example, when the application program 31 requests the file system 41 to write a location file, the file system 41 searches for a free cluster to which location data of the location file can be written as the corresponding cluster.

  Then, the file system 41 converts the found cluster into LBA (Logical Block Addressing), and requests the device driver 42 for access in units of sectors.

  The device driver 42 accesses the sector requested to be accessed from the file system 41.

  The HDD 15 accesses the requested sector of the built-in hard disk 51 under the control of the device driver 42. The hard disk 51 is formatted with the FAT file system. When the recording apparatus 10 is started, the hard disk 51 has an MBR (Master Boot Record) for executing the OS 32 recorded on the hard disk 51, and a free space. BPB (BIOS (Basic Input Output System) Parameter Block), which records the physical attributes of the hard disk 51, such as the number of sectors per cluster, and FSInfo, which records the number of free clusters for calculating free space at high speed The FAT area (management information) that manages each cluster in the data area, the spare area used for the FAT area backup, etc., the file name, the file size, the file The directory entry that stores the actual data storage location and the area that stores the actual data Data area.

  The device driver 42 responds to the file system 41 in response to an access request in units of sectors. For example, the device driver 42 supplies data read from the hard disk 51 to the file system 41 in units of sectors. The file system 41 responds to the application program 31 in response to an access request in units of files. For example, the file system 41 supplies position data, which is actual data of a position file read from a plurality of clusters, to the application program 31 in units of files.

  FIG. 3 is a block diagram illustrating a configuration example of the application program 31.

  The initialization unit 71 generates, as a position file, an empty file having a specified size that is a size (for example, 4 MB) that is equal to or larger than the maximum size assumed as the size of data recorded in the position file. That is, the initialization unit 71 records an empty file of a specified size on the hard disk 51 as a position file. In addition, the initialization unit 71 sets a file pointer representing the position on the file of interest to the beginning position of the generated position file.

  The recording processing unit 72 records the position data supplied from the position data calculating unit 13 in the position file generated by the initialization unit 71. The recording processing unit 72 corrects the file pointer to the recording end position.

  The end processing unit 73 calculates the size of the position data recorded in the position file, that is, the size of the actual position file based on the file pointer on the position file, and corrects the size of the position file to that size.

  The restoration processing unit 74 calculates the size of the position file in which the position data was recorded when the power supply was interrupted, and corrects the size of the position file to the obtained size.

  Next, an initialization process in which the initialization unit 71 in FIG. 3 performs initialization will be described with reference to FIG. This initialization process is started, for example, when the recording apparatus 10 is turned on.

  In step S1, the initialization unit 71 turns on a write flag indicating whether or not position data is being written, and proceeds to step S2. In step S2, the initialization unit 71 generates an empty file of a specified size as the position file.

  Specifically, the initialization unit 71 requests the file system 41 to write an empty file of a specified size as a position file. In response to the request, the file system 41 secures a cluster of a prescribed size in the data area as a location file cluster, and creates chain information (cluster chain) of the cluster (excluding the last cluster) in the FAT entry. .

  Further, the file system 41 records the directory entry of the position file in the data area provided in the hard disk 51. The file size stored in the directory entry is a specified size.

  After step S2, the process proceeds to step S3, where the initialization unit 71 opens the position file and proceeds to step S4. In step S4, the initialization unit 71 creates an EOF (End Of File) mark indicating the end of the position file in the FAT entry as the cluster chain of the last cluster secured as the position file cluster, and the process proceeds to step S5. . In step S5, the initialization unit 71 sets the file pointer to the head position of the position file, and ends the process.

  Next, a recording process in which the recording processing unit 72 in FIG. 3 records position data in the position file will be described with reference to FIG. This recording process is started, for example, when position data is supplied from the position data calculation unit 13.

  In step S11, the recording processing unit 72 records the position data from the position of the position file where the file pointer is set, and records the EOF mark at the end of the position data. At this time, the file pointer is corrected to the end position of the EOF mark. After the processing in step S11, the process proceeds to step S12, and the recording processing unit 72 determines whether the recording of the position data and the EOF mark is successful. If it is determined that the recording is successful, the process proceeds to step S13.

  In step S13, the recording processing unit 72 corrects the file pointer from the end position of the EOF mark to the end position of the position data (start position of the EOF mark), and ends the process. On the other hand, if it is determined in step S12 that the recording of the position data and the EOF mark has not been successful, the recording processing unit 72 performs a predetermined error process, for example, and ends the process.

  Next, with reference to FIG. 6, the termination processing in which the termination processing unit 73 in FIG. 3 terminates data recording will be described. This end process is started, for example, when the user instructs to turn off the power of the recording apparatus 10 by operating an operation unit (not shown) provided in the recording apparatus 10. If the user commands the power off during the recording process of FIG. 5, the end process of FIG. 6 is performed after the end of the recording process.

  In step S20, the end processing unit 73 turns off the write flag and proceeds to step S21. In step S21, the end processing unit 73 calculates the size of the position data recorded in the position file based on the file pointer on the position file as the actual size of the position file, Correct the file size.

  Specifically, the end processing unit 73 requests correction of the size of the position file to the calculated size. In response to the request, the file system 41 modifies the file size stored in the directory entry of the position file to the calculated size, and changes the cluster chain created in the FAT entry to the cluster of the cluster in which the position data is recorded. Modify to chain.

  As described above, the application program 31 generates a position file of a specified size, records position data in the position file while the position file is open, and corrects the size of the position file when the position file is closed. . As a result, writing to the FAT area can be suppressed to twice when the position file is opened and closed. As a result, the FAT entry can be prevented from being destroyed when the power is turned off during the recording of the position data.

  After the process of step S21, the process proceeds to step S22, and the end processing unit 73 closes the position file and ends the process.

  Next, a repair process in which the repair processing unit 74 of FIG. 3 repairs the position file will be described with reference to FIG. This restoration process is started, for example, when the recording apparatus 10 is turned on.

  In step S31, the repair processing unit 74 determines whether or not there is a position file being recorded, that is, whether or not the power is interrupted during the recording process of FIG. Specifically, the repair processing unit 74 determines that there is a position file being recorded when the write flag is on, and determines that there is no position file being recorded when the write flag is off.

  If it is determined in step S31 that there is no position file being recorded, the process ends.

  On the other hand, when it is determined in step S31 that there is a position file being recorded, in step S32, the repair processing unit 74 determines whether or not the position file has an EOF mark (recorded). If it is determined in step S32 that the position file has an EOF mark, the process proceeds to step S33, and the repair processing unit 74 stores the data from the start position of the position file to the EOF mark based on the EOF mark of the position file. Calculate the size as the actual size of the location file.

  If it is determined in step S32 that the position file does not have an EOF mark, the process proceeds to step S34, and the repair processing unit 74 starts the position file based on the checksum of the position data recorded in the position file. The size of data from the position to the last recorded normal position data is calculated as the actual size of the position file.

  After the processing of step S33 or S34, the process proceeds to step S35, and the repair processing unit 74 corrects the size of the position file to the size calculated in step S33 or S34.

It is a block diagram which shows the structural example of one Embodiment of the recording device to which this invention is applied. It is a figure which shows the functional structural example of CPU. It is a block diagram which shows the structural example of an application program. It is a flowchart explaining an initialization process. It is a flowchart explaining a recording process. It is a flowchart explaining an end process. It is a flowchart explaining a repair process.

Explanation of symbols

  14 control unit, 31 application program, 51 hard disk, 71 initialization unit, 72 recording processing unit, 73 end processing unit, 74 repair processing unit

Claims (6)

In a recording apparatus for recording the data in a file provided in the data area of a recording medium having a data area for recording data in file units and a management area for recording management information for managing the data,
Generating means for generating, as the data file, an empty file having a size equal to or larger than a maximum size assumed as the size of data recorded in the file;
A recording apparatus comprising: recording processing means for recording the data in the generated file. Calculating means for calculating the size of data recorded in the file;
The recording apparatus according to claim 1, further comprising: a correcting unit that corrects the size of the file to the size calculated by the calculating unit. A determination means for determining whether or not a power supply is interrupted during the recording of the data;
The recording means records end information, which is information indicating the end of the file, at the end of the data,
The said calculation means calculates the size of the data recorded on the said file based on the said termination | terminus information, when it determines with the determination means having interrupted the power supply during recording of the said data. Recording device. A determination means for determining whether or not a power supply is interrupted during the recording of the data;
The calculation unit calculates a size of data recorded in the file based on a checksum of the data when the determination unit determines that power is interrupted during recording of the data. The recording device described. In a recording method of a recording apparatus for recording the data in a file provided in the data area of a recording medium having a data area for recording data in file units and a management area for recording management information for managing the data,
An empty file having a size equal to or larger than the maximum size assumed as the size of data recorded in the file is generated as the data file,
A recording method including the step of recording the data in the generated file. Causes a computer to perform a process of recording the data in a file provided in the data area of a recording medium having a data area for recording data in units of files and a management area for recording management information for managing the data In the program
An empty file having a size equal to or larger than the maximum size assumed as the size of data recorded in the file is generated as the data file,
A program comprising a step of recording the data in the generated file.

Images