WO2007010826A1

WO2007010826A1 - Data recording device, data recording method, data recording program and recording medium with data recording program stored therein

Info

Publication number: WO2007010826A1
Application number: PCT/JP2006/313974
Authority: WO
Inventors: Yukiko Inoue; Kazuya Fujimura; Takuji Maeda
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-07-15
Filing date: 2006-07-13
Publication date: 2007-01-25
Also published as: JP2008242501A

Abstract

Provided are a data recording device, data recording method, data recording program and recording medium with the data recording program recorded therein. In such device, method, program and medium, a recording region for recording management data is reduced, and ID using status and unused status are easily recognized. An ID using status judging section (104) of a host device (100), i.e. a data recording device, judges whether an ID is being used or unused, based on a bit map (131) included in a recording medium (120). A control section (101) allocates an unused ID to the recording region of management data at the time of recording management data (135) in the recording medium (120), and records it in the last portion in a management data storage region (133). The control section erases the recording region wherein the management data is stored, at the time of erasing the management data from the recording medium.

Description

Specification

Data recording apparatus, data recording method, data recording program, and recording medium storing data recording program

Technical field

The present invention relates to an apparatus, a method, a program for recording data, and a recording medium storing such a data recording program.

Background art

[0002] When recording digital content such as video, audio, and text information on a recording medium such as a semiconductor memory, a magnetic disk, or a magneto-optical disk, the title and type of the recorded digital content are generally managed. Management data is recorded on a recording medium for each digital content. Management data is paired with the recorded digital content and is deleted at the same time as the digital content is deleted. Management data and content are often given the same ID to indicate correspondence.

As the simplest storage method of management data, there is a sequential method in which new management data 10 is sequentially added after stored management data 10 as shown in FIG.

[0004] As another storage method, a hashing method that efficiently searches, inserts, and deletes data is known. When storing management data using the sashing method, as shown in Fig. 11, pay attention to the search and classification by securing a recording area 12 for recording management data 10 in advance in the recording medium. Apply one of the data and key values in the data to be processed or a key function to obtain one numerical value, and determine the storage location of management data 10 based on the obtained numerical value. Further, in addition to the management data 10, the flag 11 indicating validity / invalidity of the management data 10 is provided corresponding to the storage location of the management data 10, thereby improving the search efficiency. As the flag 11, a method using a 1-bit bit flag is generally used.

Furthermore, as shown in FIG. 12, a bitmap method is also known in which the search bit flags 11 are collected in one place (see, for example, Patent Document 1). The recording area 14 having the same number of storage locations as the number of bit flags 11 included in the bitmap 13 is provided in advance in the recording medium, and the management data for each content is an entry # l indicating the storage location in the recording area 14 ~ # N Each is stored. In the bitmap method, the position of the bit flag 11 in which the leading force of the bitmap 13 is also arranged in order (with the left end force and the right end in FIG. 12) corresponds to the storage locations Entry # l to # n. . The value of each bit flag 11 indicates the usage status of each of Entry # 1 to #n, that is, whether or not valid management data is stored. In the example of FIG. 12, “1” is assigned to bit flag 11 when Entry is used, and “0” is assigned to bit flag 11 when Entry is unused. In the bitmap method, since the bit flags 11 are collected in one place, the usage status of the entry can be obtained more efficiently than the method of FIG. 11 in which the bit flag is provided in each entry. When inserting management data, the bit flag 11 of the bitmap 13 is checked in order from the top, and the management data is stored in an unused entry indicated by “0”. When deleting management data, change bit flag 11 corresponding to the entry to be deleted from “1” in the used state to “0” in the unused state.

Patent Document 1: Japanese Patent Laid-Open No. 2003-85010

Disclosure of the invention

Problems to be solved by the invention

[0006] The capacity of a recording medium such as a semiconductor memory card is often limited. In order to store as much information as possible in a limited capacity, it is necessary to reduce the area as much as possible. Is required. In addition, the amount of internal memory of devices that read and control these information is limited, and the information area that is read into the internal memory for control is required to be small. However, the conventional hashing method and bitmap method reserve large storage areas 12 and 14 for storing management data in advance, and there are unused areas that do not store management data. There are many. Therefore, if the conventional hashing method is used in the bitmap method, the required recording will not be satisfied if the recording area is reduced as much as possible.

[0007] In the conventional sequential method, it is not necessary to secure a storage area for storing management data in advance, so that the recording area can be reduced. However, in the sequential method, it is not easy to search for the ID of management data 10. For example, when the management data with ID “3” is deleted from the management data assigned with IDs “1” to “5”, the IDs are shown as “1 → 2 → 4 → 5” in the storage order of management data. Become. From this state, add an unused ID “3” When management data is newly recorded, the ID is “1 → 2 → 4 → 5 → 3” when the management data is stored. In this way, the ID order of management data changes as content is recorded or deleted. Therefore, to find out which ID is used, you must search all management data. As the capacity of the recording medium increases and the number of contents that can be recorded increases, the number of IDs used also increases, and it takes time to search for which ID is being used. In this way, the sequential method is suitable for searching the ID of management data when the number of management data to be recorded increases.

[0008] In view of the above problems, the present invention provides (1) a data recording device and data for easily recognizing the use state Z unused state of ID by reducing the recording area for recording management data. It is intended to provide a recording method, a data recording program, and a recording medium storing the data recording program.

Means for solving the problem

[0009] The data recording apparatus of the present invention is a data recording apparatus for recording data on a recording medium. The recording medium includes a recording area for storing data, and an identifier assigned to each data recording area. The data recording device has a determination unit for determining whether the identifier is not used or not based on the usage status information, and records the data on a recording medium. A controller for allocating an unused identifier to a data recording area, recording the data on a recording medium, and deleting the recording area storing the data when deleting the data from the recording medium.

[0010] The usage status information is a bitmap in the embodiment. According to the data recording apparatus and the data recording method of the present invention, (1) a recording area for recording data can be reduced, and (2) the identifier usage state Z can be easily recognized.

[0011] The data is content management data, and the control unit may assign the same identifier to the management data and the content and record the same on a recording medium.

[0012] The data recording apparatus may further include a consistency determination unit that determines consistency between usage state information and presence / absence of content. As a result, malfunction of the data recording device and data destruction can be reduced.

[0013] The determination unit determines the identification from the position indicating the usage state of the identifier in the usage state information. You may specify another child.

[0014] The control unit may update the usage state information when recording and deleting data.

[0015] The control unit may record the data after the recorded data in the recording medium. Thereby, data can be read in the order of recording in a short time. In the conventional hashing method and bitmap method, the management data is not stored in the order of the smaller addresses of the recording areas 12 and 14 (in the order of the top force in FIGS. 11 and 12), so the management data is read in the recording order. In order to find out, it is necessary to keep in the management data the elements that divide the recording order. In addition, when the management data is read, the elements need to be extracted and the management data must be rearranged in the recording order, which complicates the processing. Thus, the hashing method and the bit map method are not suitable for reading management data in the recording order. On the other hand, in the present invention, if the above configuration is used, data can be easily read in the order of recording.

[0016] The control unit may change the data recording order by changing the position of the data recording area.

[0017] The number of data recorded on the recording medium may be the same as the number of identifiers being used in the usage state information.

[0018] The data recording apparatus further includes an internal memory, the control unit reads usage state information from the recording medium and stores the usage state information in the internal memory, and the determination unit uses the usage state information stored in the internal memory. Based on the above, it may be determined whether the identifier is in use or unused.

[0019] The data recording apparatus further includes a data reproduction unit that performs reproduction processing of data recorded on the recording medium, and a data display unit that displays data reproduced by the data reproduction unit, and displays data. The unit may display recordability information indicating whether data can be recorded on the recording medium based on the determination result of the determination unit.

[0020] The data recording method of the present invention is a data recording method for recording data on a recording medium. The recording medium includes a recording area for storing data, and an identifier assigned to each data recording area. The data recording method comprises: a step for determining whether the identifier is in use or unused based on the use state information; and data on the recording medium. When recording, assigning the unused identifier to a recording area of the data and recording it on the recording medium; and recording the data on the recording medium When deleting from the recording medium, there is a step of deleting the recording area storing the data.

[0021] The data recording method includes a step of determining whether additional recording of data is possible by determining whether an identifier is in use or not used before a recording operation by a user; A step of displaying recordability information indicating whether or not the data can be recorded. As a result, the user can prepare a recordable recording medium in advance. In addition, the time from when the user performs the recording operation until the actual recording of data can be shortened.

[0022] The data recording program of the present invention is a data recording program for recording data on a recording medium, and the recording medium is assigned to a recording area for storing data and a recording area for the data. A data recording program for determining whether the identifier is in use or unused based on the usage status information, and recording the data on a recording medium. Sometimes, an unused identifier is assigned to a data recording area and recorded on a recording medium, and when data is deleted, the recording area storing the data is deleted. This is a program to be executed.

[0023] A recording medium of the present invention stores the data recording program.

The invention's effect

According to the data recording apparatus and the data recording method of the present invention, (1) a recording area for recording management data is reduced, and (2) an ID usage state Z is not easily recognized. Can do.

Brief Description of Drawings

FIG. 1 is a block diagram showing a configuration of a host device and a recording medium in Embodiment 1 of the present invention.

[Fig. 2] Flow chart showing additional recording of management data in Embodiment 1 of the present invention. [Fig. 3] Bit map status and management data during additional recording of management data when IDs in use are continuous. Conceptual diagram showing storage area

FIG. 4 is a flowchart showing management data deletion according to the first embodiment of the present invention. 圆 5] Conceptual diagram showing bitmap status and management data storage area after management data is deleted

[Figure 6] Conceptual diagram showing the bitmap status and management data storage area after additional recording of management data when the IDs in use are not consecutive

FIG. 7 is a flowchart showing additional recording of management data in Embodiment 2 of the present invention. FIG. 8 is a block diagram showing configurations of a host device and a recording medium in Embodiment 3 of the present invention.

[9] A flowchart showing management data deletion in the third embodiment of the present invention.

[Figure 10] Conceptual diagram showing the sequential method, which is a conventional data storage method

[Fig. 11] Conceptual diagram showing the hashing method, which is a conventional data storage method.

[Fig. 12] Conceptual diagram showing the bitmap method, which is a conventional data storage method

Explanation of symbols

100 host equipment

101 Control unit

102 Internal memory

103-bit flag value acquisition unit

104 ID usage status determination unit

105 Data playback section

106 Data display area

110 Pointing Devices:

120 recording media

121 Host IZF

122 Information recording area

131 bitmap

133 Management data storage area

136 directories

137 Content, Seo

807 ID consistency judgment unit BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0028] (Embodiment 1)

FIG. 1 shows a configuration of a host device 100 and a recording medium 120 that are data recording devices according to the first embodiment of the present invention. In this embodiment, the host device 100 is a video camera using a semiconductor memory force as a recording medium, and the recording medium 120 is a semiconductor memory card.

[0029] [Recording media configuration]

The recording medium 120 includes a host interface (hereinafter referred to as “host 17?”) 121 that communicates with the host device 100, and an information recording area 122 that stores digital content 137 and the like.

[0030] The information recording area 122 stores a bitmap 131 for managing the usage state of the ID, management data 135, and content 137. “ID” is identification information corresponding to each recording area of the content 137 and the management data 135.

[0031] When the content 137 is stored in the information recording area 122, a directory 136 is generated, and the content 137 is stored therein. An identifier indicated by “P Gk (l ≦ k ≦ n, n is the number of bit flags 132 included in the bitmap 131)” is attached to the directory in which the content 137 is stored. In FIG. 1, identifiers “PG1” to “PG4” are attached. Hereinafter, in this embodiment, the numerical value k included in the identifier of the directory 136, for example, the numerical value “1” included in “PG1” is referred to as “ID”. In addition, since the single content 137 can be specified by the ID of the directory 136, the “directory 136 ID” becomes the “content 137 ID”.

[0032] When the content 137 is stored in the information recording area 122, the management data 135 indicating the title and type of the content 137, the storage destination of the content 137, etc. is stored in the information recording area 122 for each content. Recorded in 133. The management data storage area 133 is provided at a position following the area where the bit map 131 is stored. In order to associate the management data 135 with the content 137, the same ID 134 as the ID of the directory 136 where the content 137 is stored is assigned to the recording area of the management data 135. For example, if content 137 is stored in the directory 136 with “PG1”, the content 137 is managed. An ID “1” is assigned to the recording area of the physical data 135.

The bit map 131 includes a plurality of bit flags 132 and is provided in advance in the information recording area 122. The number n of the bit flags 132 is determined to be a predetermined number. In the present embodiment, the number is the same as the number of IDs that can be assigned to the directory 136. The position of the bit flag 132 arranged in order of the leading force of the bit map 131 (with the left end force and the right end in FIG. 1) corresponds to the ID value of the directory 136, that is, the ID 134 value of the management data 135. . For example, the first bit flag 132 corresponds to the ID “1”, and the second bit flag 132 corresponding to the first force corresponds to the ID “2”. The value of the bit flag 132 indicates whether the ID of the directory 136 is used, that is, whether the ID 134 of the management data 135 is used. In this embodiment, the bit flag 132 indicates “1” if the ID is used, and the bit flag 132 indicates “0” if the ID is not used. For example, if the third bit flag 132 force “1” from the left of the bitmap 131 indicates “1”, it indicates that the ID “3” is used.

[0034] [Configuration of host device]

The host device 100 receives a user's operation and instructs various operations. The host device 100 controls the operation of the host device 100 based on the instructions from the pointing device 110 to the recording medium 120. And a control unit 101 that executes content 137 read processing, write processing, deletion processing, and the like.

Furthermore, the host device 100 stores the bit map 131, management data 135, and the like read from the recording medium 120 by the control unit 101, and the internal memory 102 based on an instruction from the control unit 101. Based on the bit flag value acquisition unit 103 that acquires the value of the bit flag 132 from the read bitmap 131 and the value of the bit flag 132 acquired by the bit flag value acquisition unit 103, An ID usage state determination unit 104 that determines a usage state as to whether it is in use.

[0036] Furthermore, the host device 100 is played back by the data playback unit 105 that plays back the content 137 and the management data 135 that are determined to be in use by the ID usage state determination unit 104, and the data playback unit 105. And a data display unit 106 for displaying the content 137 and the management data 135. [Additional Recording of Management Data when IDs in Use are Continuous] With reference to FIGS. 2 and 3, the additional recording of management data will be described. FIG. 2 shows a flow in which the host device 100 of the present embodiment additionally records management data 135 in the information recording area 122 of the recording medium 120. FIG. 3 shows an example of the state of the bitmap 131 in the information recording area 122 and the management data storage area 133 when the management data 135 is additionally recorded. In FIG. 3, in the management data storage area 133, the management data 135 has already been stored in the recording areas assigned ID “1” to ID “6”, and the top flag of the bitmap 131 is also the sixth bit flag. 132 is set to “1” indicating that ID “1” to ID “6” are in use. In addition, the leading force is set to “0” indicating the unused state in the seventh and subsequent bit flags 132.

In FIG. 2, when the control unit 101 of the host device 100 receives an instruction for recording operation of the content 137 via the pointing device 110 (S201), the control unit 101 records information through the host IZF 121 of the recording medium 120. The bitmap 131 is read from the area 122, and the read bitmap 131 is stored in the internal memory 102 (S202).

The bit flag value acquisition unit 103 sequentially acquires the value of the bit flag 132 from the bitmap 131 stored in the internal memory 102 in order as well (S203). The ID usage state determination unit 104 determines whether the value of the bit flag 132 is “0”. That is, it is determined whether or not the ID is unused (S204).

If the ID is in use (No in S204), the bit flag value acquisition unit 103 determines whether or not the next bit flag 132 exists in the bitmap 131 (S205). If it exists (Yes in S205), the process returns to S203, and the value of the next bit flag 132 is acquired. In this way, S203, S204, and S205 are repeated until an unused ID force is detected. In FIG. 3, the process is repeated until the value of the seventh bit flag 132 from the head of the bit map 132 is determined.

When an unused ID is detected in S204, the control unit 101 sets the value of the bit flag 132 corresponding to the detected unused ID in the bit map 131 of the recording medium 120 to “1”. (S206). The control unit 101 assigns an unused ID to the recording area of the management data 135, adds it to the end of the management data storage area 133, and records the management data 135 in the recording area (S207). In the example of Fig. 3, the ID “7” is detected as unused, and the recording The seventh bit flag from the beginning of the bitmap 120 of the media 120 is changed from “0” to “1”. Further, the control unit 101 assigns ID “7” to the recording area of the management data 135, adds the ID “7” to the end of the management data storage area 133, and records the management data 135 in the recording area. In addition, the control unit 101 generates a directory 136 having the identifier “PG7” in the information recording area 122 and stores the content 137 therein.

On the other hand, when the bit flag value acquisition unit 103 determines in S205 that the next bit flag 132 does not exist, that is, when an unused ID is not present in the bitmap 131, the content 137 It is determined that additional recording cannot be performed, and the process ends.

In this embodiment, after receiving the recording operation instruction by the user in S201, the bitmap 131 is read into the internal memory 102 in S202, and the forces S201 and S202 may be reversed. . For example, when the video camera that is the host device 100 is turned on, the bitmap 131 is read into the internal memory 102 in advance, and after receiving a recording operation instruction from the user, the processing after S203 is performed. good.

In this embodiment, the management data 135 is recorded on the recording medium 120 in S207. However, the management data 135 may be recorded on the recording medium 120 at an arbitrary timing as described below. For example, in S202, the bitmap 131 and the management data 135 in the management data storage area 133 are read into the internal memory 102, and S206 and S207 are processed with respect to the internal memory 102. The bitmap 131 of the memory 102 and the management data 135 may be recorded on the recording medium 120! /.

[0045] In S203, the bit flag value acquisition unit 103 may acquire a plurality of bit flags 132 collectively by acquiring one bit flag 132 indicating an unused ID from the bitmap 131 one by one. In this case, in S204, the ID usage state determination unit 104 determines whether or not there is an unused ID in a plurality of bit flags, and when it is determined that an unused ID is included, 1 The bit flag 132 may be judged bit by bit to identify an unused ID.

[0046] [Delete management data]

The deletion of the management data 135 will be described with reference to FIG. 4 and FIG. FIG. 4 shows a flow in which the host device 100 deletes the management data 135 from the information recording area 122 of the recording medium 120. Indicates one. FIG. 5 shows the bitmap 131 and the management data storage area 133 after the management data 135 stored in the recording area assigned the ID “3” is deleted.

In the present embodiment, the data display unit 106 displays a list of contents 137, for example, a list of titles of the contents 137 included in the management data 135. In FIG. 4, when the user designates the content 137 to be deleted from the list of content 137 displayed on the data display unit 106 using the pointing device 110, the control unit 101 displays information on the designated content to be deleted. Is received (S401). The control unit 101 reads the bitmap 131 via the host I / F 121 of the recording medium 120, and stores the read bitmap 131 in the internal memory 102 (S402).

[0048] The control unit 101 calculates the ID of the content 137 designated by the user, that is, the ID 134 of the recording area of the management data 135, and specifies the position of the bit flag 132 from the bitmap 131 stored in the internal memory 102 ( S403). The bit flag value acquisition unit 103 acquires the value of the bit flag 132 at the specified position (S404).

The ID use state determination unit 104 determines whether the value of the bit flag 132 is “1”, that is, whether the ID is in use (S405). For example, if the ID of the content 137 specified by the user in S401 is “3”, the value of the third bit flag 132 from the beginning of the bitmap 131 is read in S405, and “1” indicating the use state is displayed. ”Is set.

If the ID usage state determination unit 104 determines that the ID is unused (No in S405), it determines that the content 137 designated by the user does not exist and ends the process.

[0051] When the ID usage state determination unit 104 determines that the ID is in use (Yes in S405), the control unit 101 corresponds to the calculated ID in use of the bitmap 131 in the recording medium 120. The value of the bit flag 132 to be set is set to “0” (S406). The control unit 101 deletes the management data 135 stored in the recording area corresponding to the ID from the management data storage area 133 for each recording area (S407).

In FIG. 5, the third bit flag 132 from the beginning of the bitmap 131 of the recording medium 120 is set to “0”, and the management data 135 with ID “3” is recorded from the management data storage area 133 to the recording area. Delete each. The control unit 101 deletes the management data 135 with the ID “3”, and then deletes the management data 135 with the ID “4”. The position of the management data recording area of ID “6” is moved from ID “4” so that the management data recording area of ID immediately follows the recording area of ID “2”. Further, the control unit 101 deletes the content 137 stored in the directory “PG3” by deleting the directory “PG3” from the information recording area 122.

In the present embodiment, after receiving the content information to be deleted designated by the user (S401), the bitmap 131 is read from the recording medium 120 to the internal memory 102 (S402). And S402 may be interchanged. For example, when the video camera that is the host device 100 is turned on, the bitmap 131 is read into the internal memory 102 in advance, and after receiving the information on the content 137 to be deleted specified by the user, S403 Subsequent processing may be performed.

In this embodiment, the bitmap 131 of the recording medium 120 is updated in S406, and the management data 135 is deleted from the recording medium 120 in S407. The processing for the recording medium 120 is performed at an arbitrary timing. You can go there. For example, in S402, the management data 135 in the management data storage area 133 is read into the internal memory 102 together with the bitmap 131 in advance, and the processing of S406 and S407 is performed on the internal memory 102, and then any arbitrary Based on the management data 135 of the internal memory 102 and the bitmap 131, the recording medium 120 may be updated at the timing.

[0055] [Additional record of management data in case of continuous use of IDs]

With reference to Fig. 2 and Fig. 6, the recording method of management data when the IDs in use are not continuous will be explained. FIG. 6 shows, as an example, the state of the management data storage area 133 and the bitmap 131 when searching for unused IDs and additionally recording management data after the state of FIG.

[0056] When the management data storage area 133 of the recording medium 120 is in the state shown in FIG. 5 at the start of the recording operation, if the processing of S201 and S205 in FIG. The second ID is detected as unused. The control unit 101 sets the third bit flag from the top to “1” (S206), assigns ID “3” to the recording area of the management data 135, and adds it to the end of the management data storage area 133. Then, the management data 135 is recorded in the recording area (S207). As a result, the state of the management data storage area 133 of the recording medium 120 is The state is shown in Fig. 6. In addition, the control unit 101 generates the directory “PG3” in the information recording area 122 and stores the content 137 therein.

In the present embodiment, every time content 137 is additionally recorded, an unused ID is also searched in order for the leading force of the bitmap 131, and the first detected unused ID is used. Even if the ID being used is missing, the maximum value of the ID being used is searched and additional recording is continued using the subsequent ID, and the last bit flag 132 of the bitmap 131 is set. After using the corresponding ID, it is okay to use the ID!

According to the present embodiment, when the content 137 is recorded, the management data storage area 133 for recording the corresponding management data 134 is increased, and when the content 137 is deleted, the corresponding management data 135 is recorded. The area is deleted from the management data storage area 133. In other words, the size of the management data storage area 133 varies depending on the number of management data 135 recorded. In this embodiment, since a large recording area for the management data storage area 133 is not reserved in the information recording area 122 in advance, the limited recording capacity in the information recording area 122 can be utilized to the maximum extent. .

[0059] Further, according to the present embodiment, since the position force D of the bit flag 132 of the bitmap 131 is supported, the ID usage state Z unused state can be easily determined by looking at the bitmap 131. Can be determined. The host device 101 includes means for acquiring the state of the bit flag 132 when recording or deleting the content 137, means for determining the value of the bit flag, and means for updating the state of the bit flag 132 corresponding to the ID. By providing, it is possible to easily obtain the usage status of IDs corresponding to content that can be recorded in large quantities. As a result, the management data 135 and the content 137 can be recorded and deleted in a short time.

Furthermore, according to the present embodiment, as shown in FIGS. 3 and 6, the new management data 135 is additionally recorded at the end of the management data storage area 133. Therefore, when the management data 135 is read out in the recording order, it is only necessary to read out the management data storage area 133 in the upward order of FIGS. Therefore, the management data 135 can be read in the recording order in a short time, and the management data 135 can be displayed in the recording order on the data display unit 106 in a short time.

In the present embodiment, the position of the recording area of management data 135 is replaced. Thus, the storage order indicating the recording order of the management data 135 can be changed. Thereby, the management data 135 can be easily read out in the exchanged storage order. Even if the storage position is changed, the ID is not changed, so the value of the bit flag 132 in the bitmap 131 does not need to be changed.

[0062] (Embodiment 2)

FIG. 7 shows a flow of additional recording of management data according to the second embodiment of the present invention. In this embodiment, the configurations of the host device 100 and the recording medium 120 are the same as those in FIG. 1 of Embodiment 1, but the host device 100 is a multi-recorder that records and reproduces various data. It is a semiconductor memory card. In the data recording method of the second embodiment, before the user performs a recording operation, it is determined in advance whether there is an ID that can be assigned to the content 137 and the management data 135, and the content 137 is added to the data display unit 106. The point of displaying whether or not recording is possible is different from the data recording method of the first embodiment.

In FIG. 7, when the recording medium 120 is inserted into the host device 100, the control unit 101 of the host device 100 reads the bitmap 131 through the host IZF 121 of the recording medium 120, and reads the read bitmap 131. Store in the internal memory 102 (S701).

The bit flag value acquisition unit 103 acquires the value of the bit flag 132 from the bitmap 131 stored in the internal memory 102 (S702). The ID usage state determination unit 104 determines whether the value of the bit flag 132 is “0”, that is, whether the ID is unused (S703).

If the ID is in use (No in S703), the bit flag value acquisition unit 103 determines whether or not the next bit flag 132 exists in the bitmap 131 (S708). If the next bit flag 132 exists (Yes in S708), the process returns to S702, and the value of the next bit flag 132 is acquired. S702, S703, and S708 are repeated until an unused ID is detected

[0066] When an unused ID is detected (Yes in S703), based on an instruction from the control unit 101, the data display unit 106 indicates that the content 137 can be additionally recorded on the recording medium 120. Recordable information is displayed (S704). For example, an unused ID is indicated as recordable information.

[0067] After the recordable information is displayed, when the user performs a recording operation of the content 137, control is performed. The unit 101 receives a recording operation instruction from the user (S705). The control unit 101 sets the value of the bit flag 132 in the recording medium 120 corresponding to the unused ID detected in S703 to “1” (S706). The control unit 101 allocates an unused ID to the recording area of the management data 135, adds it to the end of the management data storage area 133, and records the management data 135 in the recording area (S707). In addition, the control unit 101 generates a directory 136 having an identifier including the same ID as the management data 135 in the information recording area 122, and stores the content 137 therein.

[0068] When the bit flag value acquisition unit 103 determines that the next bit flag 132 does not exist in the bitmap 131 (No in S708), the control unit 101 uses all IDs, and unused IDs are Judge that it does not exist. Based on the instruction from the control unit 101, the data display unit 106 displays non-recordable information indicating that the additional recording of the content 137 on the recording medium 120 is impossible (S709), and ends the process.

[0069] According to the present embodiment, in addition to the effects of the first embodiment, the following effects can be obtained. Before the user performs the recording operation, it is determined whether or not the additional recording of the content 137 is possible, and the user can record the content 137 on the recording medium 120 by notifying the user of the additional recording possibility information. It is possible to judge in advance. As a result, the user can prepare a recordable recording medium 120 when the content 137 is newly recorded.

[0070] Also, in S701, S703, and S703, the determination of whether additional recording is possible and the acquisition of the ID assigned to the recorded content are performed before receiving an instruction for the recording operation by the user. As a result, it is possible to shorten the time from when the user performs the recording operation of the content 137 until the content 137 and the management data 135 are actually recorded. Thereby, for example, audio or video can be recorded without missing the timing that the user wants to record.

In S706 and S707, the power of processing the recording medium 120 for changing the bit flag 132 and additionally recording the management data 135 on the recording medium 120. As in the first embodiment, in S706 and S707, the internal memory 102 To reflect the state of the bitmap 131 and the management data 135 of the internal memory 102 to the recording medium 120 at an arbitrary timing. You may do it.

[0072] (Embodiment 3)

FIG. 8 shows configurations of a host device and a recording medium that are data recording apparatuses according to the third embodiment of the present invention. In the present embodiment, the host device 100 is a multi-recorder, and the recording medium 120 is a semiconductor memory card. The host device 100 according to the present embodiment further includes an ID consistency determination unit 807 that determines whether or not the usage state of the ID matches the presence or absence of the content 137, as shown in FIG. Different from the configuration. Other configurations of the host device 100 and the configuration of the recording medium 120 are the same as those in the first embodiment.

FIG. 9 shows a flowchart of management data deletion in the embodiment of the present invention. The S901 force and the like S907 in FIG. 9 are the same as the S401 force and the like S407 in FIG. FIG. 9 differs from FIG. 4 in that a step (S 908) for determining whether the use status of the ID and the presence / absence of the content 137 are consistent between S905 and S906, and consistency This is the addition of a step (S909) that performs error handling when a problem is detected!

If the ID use state determination unit 804 determines that the value of the bit flag 132 corresponding to the content 137 specified by the user is “1”, that is, the ID is in use (Yes in S905), the ID use state determination unit 804 The consistency determination unit 807 determines whether or not the content 137 corresponding to the ID is actually stored in the recording medium 120 (S908). In this embodiment, it is determined whether or not the directory 136 storing the content 137 selected by the user exists in the information recording area 122.

[0075] When the ID consistency determination unit 807 determines that the content 137 corresponding to the ID exists in the recording medium 120 (Yes in S908), the control unit 801 stores the bit in the recording medium 120 corresponding to the ID. The value of the flag 132 is set to “0” (S906), and the management data 135 stored in the recording area to which the ID is assigned is deleted from the management data storage area 133 for each area (S907). In addition, the directory 136 in which the content 137 is stored is deleted.

When the ID consistency determination unit 807 determines that the content 137 corresponding to the ID does not exist on the recording medium 120 (No in S908), the control unit 101 performs processing for inconsistent data (S9 09). For example, based on an instruction from the control unit 101, the data display unit 806 displays “inconsistent data”. Information indicating that the content deletion process cannot be continued. After the control unit 101 performs processing for inconsistent data, the processing ends.

[0077] According to the present embodiment, in addition to the effects shown in the first embodiment, the following effects can be further obtained. An ID consistency judgment unit 807 is added to the configuration of the host device 100 to ensure consistency between the ID usage status and the presence / absence of the content 137, thereby preventing malfunction of the host device 100 and data on the recording media 120. It is possible to reduce the possibility of destruction. For example, it is possible to prevent content 137 and management data 135 that are not consistent from being deleted by mistake.

In FIG. 9, as the processing for inconsistent data (S909), when there is no content 137 and only the management data 135 remains in the information recording area 122, the management data 135 may be deleted. . Further, the process for inconsistent data (S909) may be omitted.

[0079] Further, as in the first embodiment, the order of reception of content information to be deleted designated by the user (S901) and reading of the bitmap 131 (S902) may be switched. Further, similarly to the first embodiment, the processing of S906 and S907 may be executed on the internal memory 102, and the contents of the internal memory 102 may be reflected on the recording medium 120 at an arbitrary timing.

In this embodiment, the operation when the ID consistency determination unit 807 is added to the configuration of the host device 101 is described for the case where the content 137 is deleted. However, the ID usage status and the presence of the content 137 are described. The determination of consistency with existence is not limited to when the content 137 is deleted. For example, the ID consistency determination unit 807 matches the ID usage status with the presence / absence of the content 1 37 in the recording medium 120 when newly recording the content 137 or when editing the content 137. Sex may be determined. As a result, it is possible to reduce the possibility of malfunction of the host device 100 and destruction of content stored in the recording medium 120.

In the first to third embodiments, in order to associate the content 137 with the management data 135, the same ID as the ID of the directory 136 where the content 137 is stored is recorded in the management data 135. The method of attaching the force ID attached to the area is not limited to this embodiment. A single ID can be identified from the position of the bit flag 132 in the bit map 131, and the correspondence between the content 137 and the management data 135 can be obtained based on the ID. ID, content 137 and management Data 135 itself may be attached. For example, instead of attaching an identifier including an ID to the directory 136, the ID may be directly embedded in the content name or content, and the same ID as the content itself may be attached to the management data 135. Further, the ID attached to the management data 135 may be embedded in the management data name or the management data. Furthermore, in Embodiments 1 to 3, the case where the ID is a numerical value has been described. However, the ID is not limited to a numerical value, and the recording area of the content 137 and management data 135 that can be recorded in large quantities on the recording medium 120, or Any content that can identify the content 137 and the management data 135 itself may be used.

In the first to third embodiments, the content 137 is stored in the directory 136. The content 137 may not be stored in the directory 136 but may be a file itself. In this case, it is recommended to embed the ID directly in the content name or content.

Further, in the first to third embodiments, the host device 100 is a video camera or a multi-recorder, and the recording medium 120 is a semiconductor memory card. The type is not limited to the embodiment. Any device and recording medium that records data may be used. For example, the host device 100 may be a PC, a video recorder, an audio recorder, or the like. The recording medium 120 may be an HDD, DVD, or the like. Even in these cases, the same effects as those of the first to third embodiments can be obtained.

[0084] It should be noted that in the first to third embodiments, the host device 100 performs control on the recording medium 120 when the content 137 and the management data 135 are recorded or deleted, for example, whether the ID is in use or not. The recording media 120 itself can determine whether it is used or assign an unused ID. The above embodiment can be applied even when a file system or metadata is managed by a card such as the recording medium 120.

In addition, all or part of the data recording device in each of the above embodiments can be realized as software that can be executed in a computer having hardware resources such as a CPU and memory. Furthermore, these software can be realized as a program that can be executed on a computer, and the program is recorded in a computer-readable recording medium. It can be recorded on the media.

Industrial applicability

The data recording apparatus and the data recording method according to the present invention have an effect of effectively using a recording area for recording data and easily recognizing the use state Z unused state of the ID, This is useful for devices and equipment that record various content data such as video recorders, multi-recorders, and audio recorders.

Claims

The scope of the claims

[1] A data recording device for recording data on a recording medium,

The recording medium is

A recording area for storing data;

Usage status information for managing the usage status of the identifier assigned to each data recording area, and

The data recording device comprises:

A determination unit that determines whether the identifier is in use or unused based on the usage state information;

When data is recorded on the recording medium, the unused identifier is assigned to the data recording area and recorded on the recording medium, and when data is deleted from the recording medium, the data storing record is stored. A controller that deletes the area;

A data recording apparatus comprising:

[2] The data is content management data,

2. The data recording apparatus according to claim 1, wherein the control unit allocates the same identifier to the management data and the content, and records the same on the recording medium.

3. The data recording apparatus according to claim 2, further comprising a consistency determining unit that determines consistency between the usage state information and the presence / absence of the content.

4. The data recording apparatus according to claim 1, wherein the determination unit specifies the identifier from a position indicating the usage state of the identifier in the usage state information.

5. The data recording apparatus according to claim 1, wherein the control unit updates the usage state information when the data is recorded and deleted.

6. The data recording apparatus according to claim 1, wherein the control unit records the data behind recorded data in the recording medium.

7. The data recording apparatus according to claim 1, wherein the control unit changes a recording order of the data by changing a position of a recording area of the data.

8. The data recording according to claim 1, wherein the number of data recorded on the recording medium is the same as the number of identifiers in use in the usage state information. Dress Place.

[9] further having an internal memory;

The control unit reads the usage state information from the recording medium, stores it in the internal memory,

2. The data recording apparatus according to claim 1, wherein the determination unit determines whether the identifier is not in use or not based on the use state information stored in the internal memory.

[10] A data reproducing unit that performs data reproduction processing recorded on the recording medium!

A data display unit for displaying data reproduced by the data reproduction unit;

Further comprising

2. The data according to claim 1, wherein the data display unit displays record availability information indicating whether or not data can be recorded on the recording medium based on a determination result of the determination unit. Recording device.

[11] A data recording method for recording data on a recording medium,

The recording medium is

A recording area for storing data;

The data recording method includes:

A step of determining whether the identifier is in use or unused based on the usage state information;

When recording data on the recording medium, assigning the unused identifier to a recording area of the data, and recording the recording medium;

When deleting the recording medium power data, deleting the recording area storing the data; and

A data recording method comprising:

[12] The data is content management data,

Assigning the same identifier to the management data and the content, 12. The data recording method according to claim 11, wherein recording is performed.

13. The data recording method according to claim 12, further comprising a step of determining consistency between the usage state information and the presence / absence of the content.

14. The data recording method according to claim 11, wherein the identifier is specified from a position indicating a usage state of the identifier in the usage state information.

15. The data recording method according to claim 11, further comprising a step of updating the usage state information when recording and deleting the data.

16. The data recording method according to claim 11, wherein the data is recorded after recorded data in the recording medium.

17. The data recording method according to claim 11, wherein the recording order of the data is changed by changing a position of a recording area of the data.

18. The data recording according to claim 11, wherein the number of data recorded on the recording medium is the same as the number of identifiers in use in the usage state information. Method.

[19] The method further includes the step of reading the usage state information from the recording medium and storing the usage state information in an internal memory of the data recording device,

12. The data recording method according to claim 11, wherein whether the identifier is in use or not is determined based on the use state information stored in the internal memory.

[20] A step of reproducing the data recorded on the recording medium!

The data recording method according to claim 11, further comprising a step of displaying the reproduced data.

[21] determining whether or not additional recording of data is possible by determining whether the identifier is not in use or not before the user's recording operation;

12. The data recording method according to claim 11, further comprising a step of displaying record enable / disable information indicating whether or not data can be recorded on the recording medium.

[22] A data recording program for recording data on a recording medium,

The recording medium is

A recording area for storing data; Usage status information for managing the usage status of the identifier assigned to each data recording area, and

The data recording program is:

A data recording program for causing a computer to execute.

23. A recording medium storing the data recording program according to claim 22.