JPH11126462A - Tape recording medium, management information generation device and management information decoding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to record data in a computer file form into a DVC(Digital Video Cassette) by recording the volume entry, directory entry and file entry which are the information for controlling volumes, directories and files in a control information recording area. SOLUTION: A volume entry generator 2, a directory entry generator 3 and a file entry generator 4 renew the volume entry and the directory entry of the control information about the file data (file A) of the first accumulating medium such as the hard disk inputted from the first accumulating medium control information outputting instrument 12 and prepare a novel file entry for the file A. A control information generating instrument 10 records the control information and the file A after renewal into the DVC through a recording/ reproducing device 6. By this, data in the file form can be treated by a magnetic tape medium such as DVC.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tape recording medium used for recording and reproducing data. Also, the present invention provides a management information generating apparatus having a function of generating management information necessary for managing video and audio data when the video and audio data are recorded on the computer, and outputting the recorded data. And a management information decryption device having a function of decrypting the management information.

[0002]

2. Description of the Related Art At present, a DVC using a magnetic tape is used as a medium for storing multimedia information including video and audio.
(Digital Video Cassette). It has been studied to connect this DVC to a computer and use it as a storage medium for a computer, like an existing hard disk or floppy disk.

[0003]

When data of an existing storage medium is handled in a file format, a hard disk or a floppy disk uses FAT (File Allocati).
on Table), and a CD-ROM has a method unique to each storage medium such as CDFS (hereinafter, referred to as a file system). However, there is currently no file system for DVC.

Here, it is conceivable to adopt an existing file system such as FAT and CDFS for DVC. However, FAT and CDFS are file systems for media that can be accessed randomly, such as magnetic disks and magneto-optical disks. If the above-mentioned existing file system is adopted for a medium such as DVC which basically requires sequential access, such as a magnetic tape, the access becomes impossible. Problems occur, such as taking time.

The present invention records data in a computer file format on a DVC, implements a DVC file system for managing the recorded files, creates management information according to the implemented file system, and generates a predetermined information on a tape. It is an object of the present invention to realize a management information generation device that records at a position and a management information decryption device that reads the recorded management information.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention relates to a management information generating apparatus for generating data management information, wherein the minimum unit of recording / reproducing data is a file and the maximum unit of recording / reproducing data is Is the volume, the volume is the first layer, the second layer is the root directory, and the third layer to the Mth (M ≧ 3) th layer are files and directories, and are composed of a plurality of layers. The unit is an entry, a volume entry that is information for managing a volume, a directory entry that is information for managing a directory, a file entry that is information for managing a file, and information on an entry of a root directory is recorded in the volume entry. The directory entry of another directory The directory or information relating to the file entry is recorded a bird, a second file entry information is the entry of the second file is another file is recorded in the file entry,
Recording the volume entry, the directory entry, and the file entry in a management information recording area in a tape recording medium.

Further, the present invention is a management information decoding device for decoding data management information recorded on a tape recording medium,
It comprises decrypting volume entries, directory entries, and file entries.

According to the present invention, a conventional hard disk,
File format data can be handled on magnetic tape media such as DVC as well as magnetic disk media such as floppy disks and CD-ROMs. It is also possible to create management information for managing file format data and to read the created management information.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, 5, 6, and 7. FIG.

(Embodiment 1) FIG. 1 is a block diagram according to Embodiment 1 of the present invention. In FIG. 1, 1 is an input device, 2 is a volume entry generator, 3 is a directory entry generator, and 4 is a file. An entry generator, 6 is a recording / reproducing device, 10 is a management information updater, 11 is a first storage medium, 12 is a first storage medium management information output device, and 30 is a management information generation device. The management information generation device 30 includes a volume entry generator 2, a directory entry generator 3, a file entry generator 4, and a management information updater 10. Hereinafter, components having the same number have the same configuration and function.

The operation of the management information generating apparatus configured as described above will be described below.

[0012] From the first storage medium 11 to the management information updater 10
Transfer of file data (hereinafter, referred to as file A) to a file. The first storage medium is assumed to be an existing storage medium such as a hard disk, a floppy disk, and a CD-ROM. In addition, the management information updating unit 1
Transferring data to 0 means, for example, moving the file A recorded on the first storage medium 11 to the management information updater 10 (hereinafter referred to as MOVE), or recording the file A on the first storage medium 11. This indicates that the file A is to be copied to the management information updater 10 (hereinafter, referred to as COPY). Here, the storage medium having the recording device 6 is referred to as a second storage medium. It is assumed that the second storage medium has an auxiliary storage device such as a DVC MIC (Memory In Cassette) separately from the main storage medium.

File A input to management information updater 10
Is input to the input device 1. Also, the input device 1 receives the management information on the file A from the first storage medium management information output device 12.
Enter more. The management information on the file A input to the input device 1 is input to the volume entry generator 2, the directory entry generator 3, and the file entry generator 4.

In the second storage medium, a file to be recorded has a hierarchical structure of a volume, a root directory, a directory, and a file, and one volume has only one root directory forming the root of the directory. In addition, the (n +
1) Hierarchical files or directories can exist. Note that a file or directory need not necessarily exist under the directory.

One file, one directory, and one volume each have one file entry, one directory entry,
There are two volume entries. For the recording / reproducing device (or the recording medium held by the recording / reproducing device), all relevant fill entries, directories, and volume entries are linked to form management information. Each entry is 6
One entry is composed of one or more sectors in units of a sector composed of 4 bytes. For example, in order to manage data to be recorded on a home digital VCR “DVC” using the management information generated according to the present embodiment, it is necessary to record the management information on a DVC tape. If a method as shown in Japanese Patent Application No. 9-67633 is used, 64-byte data can be recorded using a Sync block, which is the minimum recording unit, as a physical sector. Therefore, if each entry is divided into 64-byte units and assigned to one or more sectors, the entry as a logical recording unit and the sector as a physical recording unit can be matched, and an error occurs. Information resilience processing, etc., when they occur. When one entry is composed of a plurality of sectors, for example, if one entry is composed of sector A, sector B, and sector C, information indicating that sector B is followed by sector B is added to sector A. B indicates information indicating that the sector C follows, and sector C indicates information indicating that no sector follows.

The volume entry generator 2 has a tape ID indicating on the second storage medium, a volume name indicating the name of a volume which is the largest unit of data to be recorded on the second storage medium, and an auxiliary storage device for the second storage medium. Of the auxiliary recording data, the latest update time which is the latest time when the data in the second storage medium is updated (including addition), and the second storage medium on which the management information is actually recorded. Management information recording position information that is position information, unused position information that is information of a position that is not yet used on the second storage medium, and an unused area in the area that records management information on the second storage medium. The management information unused position information indicating the position is generated.

The directory entry generator 3 has the attribute of the directory, the latest update time of the directory, the content entry number which is the number of the file or directory entry under the directory, and the number of the directory or file entry in the same hierarchy as the directory. A next entry number, a continuous flag indicating whether a directory entry is composed of a plurality of sectors, and a directory name indicating a directory name are generated.

In the file entry generator 4, AV attributes such as file attributes and tape speeds at which recording can be performed on the second storage medium are performed.
Data attribute, second storage medium attribute depending on the recording format of the second storage medium, file ID, latest update time of the file, file size, file recording position in the second storage medium, directory or file in the same hierarchy as the file , A next entry number which is the number of the entry, a continuous flag indicating whether the file entry is composed of a plurality of sectors, and a file name. By providing a continuous flag for each sector, for example, a long file name can be efficiently handled.

As information other than the above, Version information is used, for example, to manage the version of the format when the information of such an entry is improved.
As the recording capacity information, for example, by setting a value indicating the tape length when the recording medium is a tape, the remaining amount of the recording medium can be calculated. Log information, for example, leave the error occurrence status, tape usage status / environment as information,
Quality control for reliably reading data from a recording medium is enabled.

When an auxiliary recording medium is attached to the second recording medium, a part of data to be recorded on the auxiliary storage medium is used as auxiliary information. In the case of a DVC MIC (Memory In Cassette), a 3-bit APM is added to the first 16 bytes of this memory.
(Application ID on MIC), 5-bit BCID (Basic Cass
ette ID), 5-byte Cassette ID Pack, 5-byte Ta
pe Length Pack and 5-byte Title End Pack are assigned. Thus, information on the capacity of the memory and the recording end position of the tape can be obtained.
If there is a device that can handle the auxiliary recording medium and a device that cannot handle the auxiliary recording medium, once the recording is performed by a device that can handle the auxiliary recording medium, and if the recording is performed by a device that cannot handle the auxiliary recording medium, the contents of the tape and the tape are managed As a result, there is a discrepancy in the contents of a certain auxiliary recording medium. If the 16-byte information to be recorded at the head of the MIC is set in the volume entry, the auxiliary recording medium is not updated when the recording is performed by a device that cannot handle the auxiliary recording medium. Since the value to be originally recorded on the auxiliary recording medium is set, it is possible to confirm that there is a discrepancy by comparing the two information again with a device that cannot handle the auxiliary recording medium.

As information other than the above, recording format information is generated. For example, in DVC, the basic recording format on tape is the same, but the data part is SD (NTSC, PAL format)
Video, SD video for low-rate recording, HD (HiVision) video, MPEG video, etc., each has its own compression / recording format, and video recorded in the DVC format is handled as a file as it is In order to know what kind of data this file is, information on this recording format is necessary, and a signal called STYPE, 50/60 bit specified as the recording format of DVC is used as recording format information. It may be used. The recording density information is, for example, DV
In a video recording device such as C, there is a possibility that recording with a standard track width and recording with a narrow track width due to long-time recording may coexist. . The file copyright information indicates the copyright of the data of this file. As the value, for example, CGMS (Copy Generation Managem
ent System) can be used. CGM
S is 2-bit data, 11 is copy prohibited, 10 is only once
CopyOK, 00 means copy freedom. It may be defined for a file, or may be defined for each of video and audio.

As the directory attribute information and the file attribute information, for example, if the same information used in a normal HDD or CD-ROM is used, a read-only (hidden) file and a hidden file (hidden file) can be used. ), A system file, or a directory can be indicated by ON / OFF of each bit, and a file entry and a directory entry can be identified at the same time. (If there is no directory bit in the attribute information, a file / directory identification flag is required for each entry.) The data recording position information is set for each track when, for example, DV is used. Absolute address (Absolut
e Track no.). In other words, when data is recorded, if it is confirmed how far the data has been recorded and used as data recording position information, the next time an append recording is to be made, the absolute address can be directly accessed, so that extra processing is not required. .

As in the present embodiment, information on file A is input from the first storage medium management information output unit 12 to the volume entry generator 2, the directory entry generator 3, and the file entry generator 4, and the volume entry, directory A new file entry is created for the entry update and file A. The management information updated before or after the file A is input to the management information updated, added, or deleted by each volume entry generator 2, directory entry generator 3, or file entry generator 4 is updated by the management information updater 5. The updated management information and the file A are recorded in the recording device 6.

Here, the management information is updated using the entry,
How to add and delete is shown. FIG. 2 illustrates a hierarchical structure of volumes, directories, and files, and FIG. 3 illustrates entries of the volumes, directories, and files in FIG. In FIG. 2, ROOT is a root directory, VOLUMEX is a volume name, and DIR
1, DIR2, DIR3, SUB11, SUB12. S
UB13, SUB31, SUB111, SUB131 are directory names, FILE14, FILE112, FI
LE113 and FILE132 indicate file names. FIG.
For the explanation, the volume name and management information unused position information of the information recorded in the volume entry for explanation, the directory name, directory attribute, content entry number, next entry number of the directory entry, and the file entry Indicates the file name, file attribute, and next entry number. Note that Y in the column of directory attribute and file attribute indicates that the directory or file of the entry is valid.

As the content entry number of the directory entry, one of files or directories (contents) belonging to the directory is selected, and the entry number of the entry of the selected content is set. If there is no content,
Set a value indicating that there is no As this value, for example, the entry number of a volume entry can be used. In addition, a value exceeding the maximum value that can be taken as an entry number can be set, or a flag indicating presence / absence of content can be separately set.

The address of a sector can be used as the entry number. Since each entry is allocated to one or more sectors, when the entries are ordered, it cannot be immediately determined where the management information is. However, if the address is a sector address, it is an absolute position. Is easy.

In registering these entries in the management information, a volume entry is first placed, then directory entries and file entries are packed, and the management information unused area information is also used as a sector address. Is possible. With this arrangement, the volume entry having only one piece of management information is always at the same position, and the analysis of the management information is simplified. Furthermore, since the root directory at the top of the directory / file hierarchy is used as a reference, a directory entry of the root directory (hereinafter referred to as a root entry) is registered in a position following the volume entry in the management information. In addition, analysis of management information is simplified.

Referring to FIG. 2 and FIG.
In R2, SUB12, and SUB131, the content entry number is set to a nothing flag, NF. This indicates that there are no directories or files under each directory. Looking at the next entry numbers of directories and files under the same level under DIR1, 6 is set to SUB11, 7 is set to SUB12, and SUB1 is set to 7.
13 is recorded as 13 and FILE is recorded as NF.
The NF is assigned a number not used for the entry number, for example, 0 or a negative value.

These are SUB11, SUB12, SUB1.
3, the entry number of each adjacent directory or file is indicated.
Indicates the last directory or file below. Here, FIG. 4 shows a hierarchical structure when file A is recorded under DIR1, and FIG. 5 shows an entry at that time.

3 and 5, the addition of file A under DIR1 changes the next entry number of FILE 14 from NF to 15, and the next entry number of file A becomes NF. The management information unused position information of the volume entry is changed from 14 to 15.

As described above, in the directory entry and the file entry used in the present embodiment, all directories and files are always pointed only once by the content entry number or the next entry number of another directory or file. Is shown.

As the next entry number of the directory entry, a directory or file belonging to the directory (parent directory) to which this directory belongs is selected, and the entry number of the selected entry is set. When selecting a file, the one specified by the content entry number of the entry in the parent directory or the one already specified by the next entry number of the file or directory entry belonging to the same parent directory shall be selected. Alternatively, a directory is not specified more than once. If there are no unselected files or directories belonging to the parent directory, the next entry number of the last selected content entry is set to a value indicating that there is no next entry. This value
For example, the entry number of a volume entry can be used. In addition, a value exceeding the maximum value that can be taken as an entry number can be set, a flag indicating presence / absence of content can be set separately, or a flag indicating presence / absence of the content can be set separately.
The next entry number of the file entry can be set in the same manner as the directory entry described above.

In the present embodiment, the volume,
It is also possible to limit the total number of sectors constituting each directory and file entry to an arbitrary number.
By limiting, the upper limit of the amount of management information on the second storage medium can be limited. Also, when all the management information is read at once and the information is updated, the access speed is increased.

Next, a method of updating the management information when a directory or a file in the management information is deleted will be described. For example, when the FILE 112 in FIG. 2 is deleted, M indicating that the file is invalid is added instead of Y in the file attribute column of the FILE 112. In addition, when the FILE 112 is invalidated, the directory SU
The next entry number of SUB111 which is the same hierarchical directory under B11 is changed from the entry number 12 of FILE112 to the entry number 13 of FILE113. When SUB131 and FILE132 are deleted, the directory attribute of SUB131 and FILE1 are deleted.
The file attribute of M.32 is M, and the content entry number of SUB 13, which is the directory immediately above, is NF.

As described above, in the present embodiment, it is possible to handle file format data on a magnetic tape medium such as DVC.

(Embodiment 2) FIG. 6 is a block diagram according to Embodiment 2 of the present invention. In FIG. 6, reference numeral 20 denotes a management information extractor, 21 denotes a management information decoder, 22 denotes a display device, and 26 denotes a second display device. 2 is a recording / reproducing device, and 31 is a decoding device. The decryption device 31 includes a management information extractor 20, a management information decryptor 21, and a second recording / reproducing device 26. Hereinafter, components having the same number have the same configuration and function.

The operation of the management information decrypting device configured as described above will be described below.

In the tape recording medium such as DVC in the second recording / reproducing apparatus 26, an area for recording management information is defined. FIG. 7 shows an example of a tape media storage medium in the second recording / reproducing device 26. 100 in FIG.
Reference numeral 111 denotes a management information recording area, and 112 and 113 denote actual data recording areas, that is, file data recording areas. Here, reference numeral 110 denotes an area in which management information has already been recorded in the management information area, and reference numeral 111 denotes an unused management information recording area in which management information has not yet been recorded.
Reference numeral 112 denotes an area in which a file has already been recorded, but reference numeral 113 denotes an unused file data recording area in which file data has not yet been recorded.

The management information recorded in the management information area is extracted by the management information extracting device 20. The retrieved management information is sent to the management information decoder 21. The volume entries, directory entries, and file entries that constitute the management information are the same as those described in the first embodiment. That is, it has the form shown in FIG. 2 and FIG.

First, the management information decoder 21 decodes the volume entry. That is, the tape ID, the volume name, the auxiliary recording data which is a part of the data of the auxiliary storage device of the storage medium, the latest update time in the storage medium, and the management information which is the top position of 110 in FIG. Management information recording position information on the storage medium actually recorded,
Similarly, the unused position information of a position that is not yet used on the storage medium, which is the head position of 113 in FIG. 7, and the position of an unused area in the area for recording management information that is the head position of 111 in FIG. Decrypt the indicated management information unused position information.

Next, the directory entry for the root directory (hereinafter referred to as the root entry) located at the highest level in the directory / file configuration hierarchical structure is decoded. For this purpose, the position of the root entry in the management information storage area is determined. Must be specified. Directory entries, including the root entry, have directory attributes,
The latest update time of the directory, content entry number, next entry number, continuous flag,
Decrypt directory names.

In the file entry, the attribute of the file, the attribute of the AV data, the attribute of the storage medium depending on the recording format of the storage medium, the file ID, the latest update time of the file, the file size, the file recording position in the storage medium, the next entry Decrypt numbers, continuous flags, and file names.

After decrypting the management information, the root directory,
The directory and file are configured and transferred to the display device 22 to display the hierarchical structure. FIG. 3 shows a partial example of the management information, and FIG. 2 shows a hierarchical structure reflecting the management information of FIG.

First, the next entry number of the root directory is NF. This indicates that the root directory is the highest level, and that there are no other directories and files in the same level. The content flag of the root entry indicates 2. As a result, it is understood that DIR1 exists first in the hierarchy immediately below the root directory. In the next entry number of DIR1, 3 indicating the directory entry of DIR2 is decoded, and in the next entry entry of DIR2, 4 indicating the directory entry of DIR3 is decoded. In the next entry number of DIR3, NF indicating that there are no more directories and files in the same hierarchy is decoded. As a result, as shown in FIG. 2, DIR1, DIR2, D
The presence of IR3 is decoded. The content flag of DIR2 is NF. This indicates that no directory or file exists in the hierarchy immediately below DIR2.

As described above, in this embodiment, it is possible to decode the management information when handling file format data on a magnetic tape medium such as DVC.

The management information shown in FIG. 3 or FIG. 5 is recorded in the management information recording area of FIG.

FIG. 8 shows an example of record information in a volume entry, FIG. 9 shows an example of record information in a directory entry, and FIG. 10 shows an example of record information in a file entry.

In FIG. 8, tape identification information is recorded in the tape ID. In the volume name, a name unique to each volume is recorded. The MIC information records a copy of part or all of the information recorded in the MIC. The last access time records the date and time when the volume information was last updated. In the start position, a volume recording position in the recording medium is recorded. As the entry number, the smallest number among the empty unrecorded entries is recorded.

In FIG. 9, directory attributes are recorded as attributes. The last access time records the date and time when the directory entry was last updated. In the content entry number, an entry number of a directory or a file immediately below the directory is recorded in the directory entry, or information indicating that neither the directory nor the file exists immediately below the directory. In the next entry information, an entry number of a directory or a file in the same layer as the directory or information indicating that neither a directory nor a file exists in the same layer is recorded. In the continuous flag, the continuous sector number in the case where this entry extends over a plurality of sectors, or information indicating that the sector does not continue is recorded. The directory name records the name of the directory. In FIG. 10, a file attribute is recorded in the attribute. In the data attribute, the type of a signal to be recorded, for example, information indicating a signal compression method is recorded. The device attribute records information on the device to be recorded. The last access time records the date and time when the file entry was last updated. The file size records the size of the file, for example, the bit length of the file. The file position records the recording position of the file in the recording medium. In the next entry information, an entry number of a directory or a file on the same layer as the file or information indicating that neither a directory nor a file exists on the same layer is recorded. In the continuous flag, the continuous sector number in the case where this entry extends over a plurality of sectors, or information indicating that the sector does not continue is recorded. Record the file name in the file name.

The present invention is also a program recording medium storing a program for realizing all or a part of each function exhibited by the apparatus of the present invention.

In the apparatus of the present invention, all or a part of each function realized by the apparatus may be realized by a hardware circuit dedicated to the function or may be realized by software using a computer.

In this embodiment, the capacity of one sector is
Although the size is set to 64 bytes, the present invention is applicable to any capacity. It is assumed that the management information and the file A updated by moving the file and the like are recorded in the recording / reproducing device 6, but the updated management information is stored in the recording / reproducing device 176.
It is sufficient that the data is recorded on the second recording medium before the second recording medium is taken out from the second recording medium.

Although examples of entries are shown in FIG. 3, these are just examples, and not all information is required, and other information can be incorporated. The byte / bit amount required to represent such information is also an example, and similar effects can be obtained by using other values. Although the address of the sector is used as the entry number, the present invention is applicable even if another value is used.

[0054]

As described above, according to the present invention, file format data can be handled in a magnetic tape medium such as a DVC as well as a magnetic disk medium such as a conventional hard disk, floppy disk or CD-ROM. It is also possible to create management information for managing file format data and to read the created management information.

[Brief description of the drawings]

FIG. 1 is a block diagram of a device configuration for realizing a first embodiment of the present invention.

FIG. 2 is a hierarchical structure diagram of a root directory, directories, and files.

FIG. 3 is a diagram showing management information composed of entries.

FIG. 4 is a diagram showing a hierarchical structure of a root directory, directories, and files.

FIG. 5 is a diagram showing management information composed of entries.

FIG. 6 is a block diagram of a device configuration for realizing a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a recording area in a recording medium.

FIG. 8 shows recording information in a volume entry.

FIG. 9 shows record information in a directory entry.

FIG. 10 shows record information in a file entry.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 input device 2 volume entry generator 3 directory entry generator 4 file entry generator 5 management information updater 6 recording device 10 management information updater 11 first storage medium 12 first storage medium management information output device 20 management information extractor Reference Signs List 21 management information decoder 22 display device 26 second recording / reproducing device 30 management information generating device 31 decoding device

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tatsuro Shigesato 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inside the corporation

Claims (36)

[Claims] 1. A data management information, which is information for managing data recorded on a tape recording medium, is recorded at a predetermined position on the tape recording medium, and a maximum recording amount of the data management information in the tape recording medium. A tape recording medium characterized by having restrictions. 2. A management information generating apparatus for generating data management information, wherein a minimum configuration unit of recording / reproducing data is a file, a maximum configuration unit of recording / reproducing data is a volume, and the volume is a first layer. The secondary layer is composed of a plurality of layers including a root directory, a third layer to an M-th (M ≧ 3) layer, and files and directories. The unit of information is an entry, and the information for managing the volume is a volume. An entry, information for managing the directory is defined as a directory entry, information for managing the file is defined as a file entry, and information relating to an entry of a root directory is recorded in the volume entry. A certain second directory, or Information about Airuentori is recorded, a second file entry information is the entry of the second file is another file is recorded in the file entry, the volume entry, the directory entry,
The management information generating device, wherein the file entry is recorded in a management information recording area in a tape recording medium. 3. A method according to claim 1, wherein one volume entry corresponds to one volume, one directory entry corresponds to one directory, and one file entry corresponds to one file. 3. The management information generation device according to claim 2, wherein 4. A recording medium ID for identifying a recording medium, a name of a volume, additional memory information which is information of an additional memory which is a recording device added to the recording medium, and a latest update which is a time when contents of the recording medium are updated. All or any of information, data recording position information that is a recording position where recording / reproducing data is recorded on a recording medium, or management information unrecorded area information indicating an unrecorded area in the management information recording area is recorded in a volume entry. Directory attribute indicating the attribute of the directory, the directory update time which is the update time of the directory, the directory name indicating the name of the directory, the Lth (L ≧
3) The directory entry (L
+1) the directory entry number of the next layer directory or the content entry number which is the file entry number of the (L + 1) th layer file, and the Mth (M ≧ M)
3) In the directory entry of the next layer directory, the directory entry number of the Mth layer directory, the next entry number which is the file entry number of the Mth layer file, or one directory entry is 1
All or any of the consecutive flags indicating whether the information is recorded in the sector that is the unit of information amount of the entry or across multiple sectors, is recorded in the directory entry, and File attributes indicating attributes, file update times that are file update times, file names indicating file names, next entry numbers, file IDs identifying files, file sizes, and location information where files are recorded on a recording medium 4. The management information generating apparatus according to claim 2, wherein all or any one of the file position and the continuation flag indicating "." Is recorded in the file entry. 5. The management information generating apparatus according to claim 2, wherein a next-nothing flag indicating that there is no file or directory in the same hierarchy is included in the directory entry and the file entry. 6. The directory entry includes a (P + 1) th layer directory managed by the Pth (P ≧ 3) next directory and a content-nothing flag indicating that there is no file in the directory entry. 3,
4. The management information generation device according to 4 or 5. 7. The management information generation apparatus according to claim 2, wherein a sector is a recording unit of an entry recorded in the management information area, and the number of sectors is limited. 8. When a file or directory is newly added, information on an unrecorded area in the management information area in the volume entry is checked, and a new file and directory entry is added to the unrecorded area in the management information area. 8. The management information generating apparatus according to claim 2, wherein the unrecorded area information in the information area is updated, and when deleting a file or a directory, the unrecorded area information in the management information area is updated. . 9. When a file or directory is newly added or deleted in the Q-th (Q ≧ 3) next layer, the content flag and the content-nothing flag of the directory of the (Q-1) next layer and the Q-th 9. The management information generating apparatus according to claim 2, wherein a next flag or a next nothing flag of a layer file or directory is rewritten. 10. The management information generating apparatus according to claim 2, wherein identification information of the recording medium is recorded in a volume entry. 11. The management information generation device according to claim 2, wherein a volume name is recorded in a volume entry. 12. The management information generating apparatus according to claim 2, wherein a part or all of the information recorded on the second recording medium is recorded in the volume entry. 13. The management information generating apparatus according to claim 2, wherein a recording position of the volume entry in the recording medium is recorded. 14. The management information generating apparatus according to claim 2, wherein an attribute of the directory is recorded in the directory entry. 15. The management information generating apparatus according to claim 2, wherein a directory name is recorded in a directory entry. 16. The management information generating apparatus according to claim 2, wherein a file attribute is recorded in a file entry. 17. The management information generating apparatus according to claim 2, wherein a file name is recorded in a file entry. 18. The management information generating apparatus according to claim 2, wherein a type of a signal to be recorded in the file entry is recorded. 19. The management information generating apparatus according to claim 2, wherein a type of the apparatus to be recorded in the file entry is recorded. 20. The management information generating apparatus according to claim 2, wherein a type of a signal to be recorded in the file entry is recorded. 21. The management information generating apparatus according to claim 2, wherein a recording position of the file entry in the recording medium is recorded. 22. A tape recording medium on which data management information is recorded, wherein a volume entry, a directory entry, and a file entry are recorded in a management information recording area in the tape recording medium. Medium. 23. The method according to claim 1, wherein when the tape recording medium is connected to another recording medium and data is transmitted and received, data management information recorded on the tape recording medium is stored in a memory. 23. The tape recording medium according to 22. 24. One volume entry corresponds to one volume, one directory entry corresponds to one directory, and one file entry corresponds to one file. Claim 22 or 2
3. The tape recording medium according to 3. 25. All or any of a recording medium ID, a volume name, additional memory information, latest update information, data recording position information, or management information unrecorded area information is recorded in a volume entry; Attributes, directory update time, directory name, content entry number, next entry number and / or continuation flag are recorded in the directory entry, and file attributes, file update time, file name,
25. The tape recording medium according to claim 22, wherein all or any one of a next entry number, a file ID, a file size, a file position, and a continuation flag is recorded in the file entry. 26. The tape recording medium according to claim 22, wherein the next nothing flag is included in the directory entry and the file entry. 27. A content entry-nothing flag is included in a directory entry.
The tape recording medium according to any one of the above. 28. The tape recording medium according to claim 22, wherein the number of entries recorded in the management information area is limited. 29. When a file or directory is newly added, information on an unrecorded area in the management information area in the volume entry is checked, and a new file and directory entry is added to the unrecorded area in the management information area.
29. The tape recording medium according to claim 22, wherein the unrecorded area information in the management information area is updated, and when deleting a file or a directory, the unrecorded area information in the management information area is updated. 30. When newly adding or deleting a file or directory to the Qth (Q ≧ 3) next layer,
The content flag and the content nothing flag of the directory of the (Q-1) th layer and the next flag or the next nothing flag of the file or directory of the Qth layer are rewritten. Tape recording medium. 31. A management information decoding device for decoding data management information recorded on a tape recording medium, wherein the management information decoding device decodes volume entries, directory entries, and file entries. 32. A recording medium ID in a volume entry,
Decrypt all or any of volume name, additional memory information, latest update information, data recording position information or management information unrecorded area information, and directory attributes in directory entries, directory update time, directory name, contents Decrypt all or any of the entry number, next entry number or continuous flag, and file attributes, file update time, file name, next entry number, file ID, file size, file position, The management information decrypting apparatus according to claim 31, wherein all or any of the continuous flags is decrypted. 33. The management information decrypting apparatus according to claim 31, wherein the next-nothing flag in the directory entry and the file entry is decrypted. 34. The management information decrypting apparatus according to claim 31, wherein the content-nothing flag in the directory entry is decrypted. 35. A program recording medium storing a program for realizing all or a part of each function executed by the management information generating device according to claim 2. Description: 36. A program recording medium storing a program for realizing all or a part of each function executed by the management information decoding apparatus according to claim 31.