JPH11232838A - Optical disk, optical disk recording device, and optical disk reader - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To quickly access file management information of an optical disc. SOLUTION: An optical disk 1 is provided with areas such as a volume information management recording area S1, a file management information recording area S21, and a file entity recording area S3. When the optical disk recording device 2 records information on the optical disk 1 via the writer 22, the formatter 21 determines the arrangement of the FIDs in the file management information recording area S21,
It is determined that only one process is required. That is, FIDs in which FIDs managing file names and directory names are arranged for each directory and FEs managing file attributes are collected for each parent directory. When the optical disk reader 3 reads the information of the optical disk 1, the reader 32 reads the data of the file management information and transfers it to the storage device 31. Subsequently, when actual data is taken out, the file entity recording area S3 is accessed using the data in the storage device 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk, an optical disk recording device, and an optical disk reading device using a file management method for accelerating file access to an optical disk.

[0002]

2. Description of the Related Art UDF (Universal Disk Format) has been standardized as a file system for optical disks. The DVD which is an optical disk has a DVD-RO
M, DVD-R, DVD-RAM and the like. Each of these optical discs can handle data in common by the UDF file system. According to this file system, data can be input and output between computers and DVD drives.

[0003] UDF has a UDF volume structure.
e Structure) and UDF File Structure
e). The UDF file structure includes a file set descriptor (File Set Descriptor), a file identification descriptor (F
The file includes a file entry (hereinafter, referred to as FE) and a file entry (hereinafter, referred to as FE). The file set descriptor is a descriptor for recognizing a file set. The FID is a descriptor for managing directory and file identifiers. FE
Indicates attribute information of the file or directory, including information on the recording position of the file or directory.

[0004] The UDF file structure and the file data area are recorded in one partition of the DVD, and are defined as a logical volume. The logical volume is composed of a logical block number (hereinafter referred to as LBN) starting from the first sector.
Is assigned.

In the file management information recording area as a UDF file structure, there is a logical area for managing individual file names and directory names included in the same directory, that is, a set of FIDs (hereinafter, referred to as FIDs). Although FIDs belonging to the same directory are arranged in a continuous area, FIDs in different directories are not always arranged in an area which can be read continuously.

FIG. 11 is an explanatory view showing the structure of a conventional DVD logical area. As shown in FIG. 11A, a volume management information recording area S1, a file management information recording area S20, and a file entity recording area S3 are provided as information recording areas of the optical disc. The volume management information recording area S1 is an area in which a volume structure is described, and the file management information recording area S20 is, for example, as shown in FIG.
The file entity recording area S3 is an area in which data of each file is actually recorded.

FIG. 1 is an explanatory diagram showing the general relationship among an optical disk 1, an optical disk recording device 2, and an optical disk reading device 3. The optical disc 1 (DVD-ROM) has a volume management information recording area S1, a file management information recording area S20, and a file entity recording area S3.

The minimum unit of the data recording area of the optical disc 1 is a sector, which has a capacity of 2 kB (2048 B). An error correction block (ECC block) as the next recording unit is composed of 16 sectors. Therefore one ECC
The block consists of 32 kB of data. The innermost track of the optical disc 1 has 17 sectors, and the outermost track has 40 sectors. These track pitches are 0.
74 μm. Then, an LSN (Logical Sector Number), which is a physical area of the disk, is assigned to each sector. In addition, a logical block number (LBN), which is a logical area of a disk, is assigned to a sector in which actual data is recorded.
r) is assigned. Here, there is a relationship of LBN = LSN-p. As a rotation control method for the optical disc 1 having such a format, ZCLV (zoned constant linear) is used.
velocity) is used.

The optical disk recording apparatus 2 shown in FIG. 1 is for recording information in each of the recording areas S1, S20 and S3 of the optical disk 1. In the case of a DVD-ROM, an authoring device edits content data, formats the data into disk image data, masters the data, and manufactures a recorded optical disk 1 by press working. In a DVD-RAM, data is recorded on the optical disc 1 as needed using a formatter 21 and a writer 22.

The optical disk reader 3 has the function of a DVD drive, and has a storage device 31, a reader 32, and a control device 33. The optical disk reader 3 first reads management information of the volume management information recording area S1 and the file management information recording area S21 from the optical disk 1, and
Based on these management information, the file entity recording area S3
The desired actual data is read from.

As shown in FIG. 11, in the file management information recording area S20, FE (R
oot), FIDs (Root), FE (DIR 1), FIDs (DIR
1), FE (FILE 11), FE (FILE 12), FE (DIR 13)
... is described. The order in which these FEs and FIDs are described is not specified in the UDF, and can be freely set by the creator of the DVD content. Therefore, for example, the recording area of FIDs (DIR 1) and FIDs (DIR 1)
The recording area 2) may exist in a different track or ECC block of the optical disc 1 in some cases.

In such a UDF file system for a DVD, if a logical area for managing individual file attributes in the file management information recording area is FE, the DV
The DVD reading device, which is the D drive, accesses the root FIDs, which is a list of files and directory FIDs included in the root directory, by using a pointer recorded in the root FE at the top of the directory structure. A predetermined FE is accessed by the pointer recorded in the FID searched by the file or directory name included in the FIDs. Next, the entity of the FID or the file related to the child directory is accessed by the pointer recorded in the FE. When trying to further follow the directory structure, the same processing is repeated.

FIG. 12 shows an example of a conventional file management information structure (UDF file structure), and is an explanatory diagram showing a method of following a directory structure in a lower direction. Actually, in order to trace the directory structure upward, an FID indicating a parent directory is arranged as the first FID of each FID, but is omitted in this description for simplicity. A procedure for reading the UDF file structure recorded in the file management information recording area S20 will be described with reference to FIG. First, a file set descriptor (File Set Descriptor) not shown is read, and the FE position information of the root directory (Root) is obtained. Next, the FIDs of the root directory are browsed, and the name of the directory belonging to the root directory is obtained. Here, it is known that directory 1 (DIR 1) and directory 2 (DIR 2) are registered in the root directory. If the user wants to know the recording location of the directory 1, he goes to FE (DIR 1). If he wants to know the recording location of the directory 2, he goes to FE (DIR 2).

According to the instruction of FE (DIR 1), FIDs (DIR 1)
Browse 1). Here, the names of the file 11 (FILE 11), the file 12 (FILE 12), and the directory 13 (DIR 13) belonging to the directory 1 are acquired from each FID.
To retrieve the file 11, the user browses the FE (FILE 11), accesses the file entity recording area S3 where the data of the file 11 is recorded, and reads the actual data. When taking out the file 12, the user browses the FE (FILE 12) and acquires the recording position.

On the other hand, when it is presumed that another data is stored in a file belonging to the directory 2, the contents of the directory 2 must be browsed. In the example shown in FIG. 12, the FE of the directory 2 is recorded at a position (LBN) separated from the FE of the directory 1. The LBN in which the FE of the directory 2 is recorded is
When the FE exists in a different track or ECC block from the FE of the directory 1, the reader 32 in FIG. 1 performs head access, traverses to a desired track, and
The CC block will be searched.

[0016]

As described above, when browsing a plurality of directories or their child directories and acquiring the position information of the entity recording area of the stored data, the recording areas of the FIDs of each directory are dispersed. If FI
There is a mechanical delay in the search for Ds.

In the DVD UDF file system, in the logical area FIDs for managing individual file names and directory names in the file management information recording area, FIDs representing files and directories belonging to the same directory are not consecutive. Is arranged in the region that has been set. However, as shown in the above-described example, FIDs belonging to different directories are not always arranged in a continuously readable area.

Further, when trying to follow the directory structure in the optical disk reader, the FIDs and the FEs, which are generally unreadable, are alternately accessed. Sometimes it was difficult to use it as a data buffer.

The present invention has been made in view of such conventional problems, and is intended to format file management information so that it can be read efficiently and to read desired data when playing back an optical disk. An optical disk, an optical disk recording device, and an optical disk reading device capable of further shortening the access time for the optical disk.

[0020]

According to a first aspect of the present invention, an area in which a file including actual data is recorded is defined as a file entity recording area, and a file name and a directory of the file recorded in the file entity recording area are defined. A logical area for managing names is FID, a list of the FIDs for managing file names and directory names of files included in the same directory is FIDs of the same directory, and a recording area of the FIDs is a file management information recording area. In this case, the plurality of FIDs are arranged in a continuously readable area in the file management information recording area of the optical disc.

According to a second aspect of the present invention, there is provided an optical disk recording apparatus for recording information on an optical disk, wherein when the input real data is recorded in a file substance recording area of the optical disk, the real data is written in a predetermined format. And a formatter for creating file management information for managing the file name and directory name of the file in which the actual data is stored, and the file management information recorded by the formatter in the file management information recording area of the optical disc. A writer for recording and recording a file containing the actual data in the file entity recording area;
The formatter comprises: a logical area for managing a file name and a directory name of a file recorded in the file entity recording area, and a logical area for managing the file name and the directory name of a file included in the same directory. The sequence of FIDs is FIDs, and the FID
When the recording area of s is a file management information recording area,
The plurality of FIDs are arranged in a continuously readable area in the file management information recording area of the optical disc.

According to a third aspect of the present invention, in the optical disk according to the first aspect, the file management information recording area first stores information on files and directories belonging to the same directory among the plurality of FIDs, and then stores information on a parent directory. And information relating to files and directories belonging to the child directory and the child directory are arranged in an area from which the information can be read continuously.

According to a fourth aspect of the present invention, in the optical disk recording apparatus of the second aspect, the file management information recording area first stores information on files and directories belonging to the same directory among the plurality of FIDs. It is characterized in that information on files and directories belonging to a parent directory and its child directories is arranged in an area where it can be read continuously.

The invention of claim 5 of the present application is directed to claim 1 or 3
In the optical disc, recording address information indicating a position on the optical disc where FIDs of each directory is recorded in a logical area FID for managing a directory name of a file recorded in the file entity recording area. It is a feature.

The invention of claim 6 of the present application is directed to claim 2 or 4
In the optical disk recording device, the address information indicating the position on the optical disk where the FIDs of each directory is recorded is recorded in the logical area FID for managing the directory name of the file recorded in the file entity recording area. It is characterized by the following.

The invention of claim 7 of the present application is directed to claim 1 or 3
In the optical disc, an address indicating the position on the optical disc where the FID is recorded and the FIDs of the directory are recorded in the logical area FID for managing the directory name of the file recorded in the file entity recording area. Is recorded with a difference value from the address indicating the position.

The invention of claim 8 of the present application is directed to claim 2 or 4
In the optical disc recording apparatus, an address indicating a position on the optical disc where the FID is recorded and a FID of the directory are stored in a logical area FID for managing a directory name of a file recorded in the file entity recording area.
A difference value from an address indicating a position on the optical disk where s is recorded is recorded.

According to a ninth aspect of the present invention, an area in which a file including actual data is recorded is defined as a file entity recording area, and a logical name for managing a file name and a directory name of the file recorded in the file entity recording area. Area is F
When the FID array for managing file names and directory names of files included in the same directory is FIDs of the same directory, and the recording area of the FIDs is a file management information recording area, the file entity recording area An optical disk reading apparatus for reading an optical disk having a file management information recording area and the file management information recording area, wherein the file substance information recording area and the file management information recording area of the optical disk are accessed to read data recorded in those areas. A reader, a storage device for storing at least a part of the file management information recording area read via the reader, and a storage location of a desired file by searching the file management information held in the storage device Information and obtains the file based on the storage location information. A control unit for instructing the reader to obtain the actual data by accessing the Le entity recording area,
When the data in the file management information recording area which must be continuously accessed is already stored in the storage device, the control device uses the stored file management information to store the file entity recording area. Is instructed to access.

According to a tenth aspect of the present invention, an area in which a file including actual data is recorded is defined as a file entity recording area, and a file name and a directory name of the file recorded in the file entity recording area are managed. Area is F
When the FID array for managing file names and directory names of files included in the same directory is FIDs of the same directory, and the recording area of the FIDs is a file management information recording area, the file entity recording area An optical disk reading apparatus for reading an optical disk having a file management information recording area and the file management information recording area, wherein the file substance information recording area and the file management information recording area of the optical disk are accessed to read data recorded in those areas. A reader, a storage device for storing at least a part of the file management information recording area read via the reader, and a storage location of a desired file by searching the file management information held in the storage device Information and obtains the file based on the storage location information. A control unit for instructing the reader to obtain the actual data by accessing the Le entity recording area,
The control device instructs the storage device to provide the file management information that can be read only by one access of the reader to the storage device. Instructing to give the read file management information to a free area of the storage device, and if data in the file management information recording area that must be continuously accessed is already stored in the storage device, It is characterized by giving an instruction to access the file entity recording area using the stored file management information.

According to an eleventh aspect of the present invention, an area in which a file including actual data is recorded is defined as a file entity recording area, and a logical name for managing file names and directory names of the files recorded in the file entity recording area. Area is F
When the FID array for managing file names and directory names of files included in the same directory is FIDs of the same directory, and the recording area of the FIDs is a file management information recording area, the file entity recording area An optical disk reading apparatus for reading an optical disk having a file management information recording area and the file management information recording area, wherein the file substance information recording area and the file management information recording area of the optical disk are accessed to read data recorded in those areas. A reader, a storage device for storing at least a part of the file management information recording area read via the reader, and a storage location of a desired file by searching the file management information held in the storage device Information and obtains the file based on the storage location information. A control unit for instructing the reader to obtain the actual data by accessing the Le entity recording area,
The control device instructs to store the file management information, which can be read by only one access of the reader, in an arbitrary area Ai of the storage device, and is possible as a capacity of the storage device. For example, when an instruction is given to an area Aj that is continuous with the area Ai of the storage device, and when data in the file management information recording area that must be continuously accessed is already stored in the storage device, An instruction to access the file entity recording area using the file management information is provided.

According to a twelfth aspect of the present invention, an area in which a file including actual data is recorded is defined as a file entity recording area, and a logical name for managing file names and directory names of files recorded in the file entity recording area is provided. Area is F
When the FID array for managing file names and directory names of files included in the same directory is FIDs of the same directory, and the recording area of the FIDs is a file management information recording area, the file entity recording area An optical disk reading apparatus for reading an optical disk having a file management information recording area and the file management information recording area, wherein the file substance information recording area and the file management information recording area of the optical disk are accessed to read data recorded in those areas. A reader, a storage device for storing at least a part of the file management information recording area read via the reader, and a storage location of a desired file by searching the file management information held in the storage device Information and obtains the file based on the storage location information. A control unit for instructing the reader to obtain the actual data by accessing the Le entity recording area,
Wherein the control device instructs the storage device to selectively provide only the recording area of the FIDs to the storage device out of the file management information that can be read only by one access of the reader, If the capacity is possible, an instruction is given to give only the recording area of the FIDs to the free area of the storage device among the file management information read by the reader, and the file management information record which must be accessed continuously If the FIDs in the area are already stored in the storage device,
It is characterized by giving an instruction to access the file entity recording area using the stored file management information.

[0032]

(Embodiment 1) An optical disc using a file management method according to Embodiment 1 of the present invention,
An optical disk recording device and an optical disk reading device will be described. The relationship among the optical disk 1, the optical disk recording device 2, and the optical disk reading device 3 of the present embodiment is the same as that shown in FIG. FIG. 2 is an explanatory diagram showing the configuration of the DVD logical area according to the present embodiment. As shown in FIG. 2A, on the optical disc 1 (DVD), a volume management information recording area S1 describing a volume structure, a file management information recording area S21 describing a file structure, and data of each file are actually recorded. A file entity recording area S3, which is an area that has been set.

The optical disk recording apparatus 2 shown in FIG. 1 records information in each of the recording areas S1, S21, S3 of the optical disk 1. In a DVD-ROM, data is recorded on the optical disc 1 via a formatter 21 corresponding to an authoring device and a writer 22 corresponding to a mastering device or a pressing device. In the DVD-RAM, data is recorded on the optical disc 1 via the formatter 21 and the writer 22 of the optical disc recording device 2.

The optical disk reading device 3 has a function of a DVD drive, has a storage device 31, a reader 32, and a control device 33, and manages management information of a volume management information recording area S1 and a file management information recording area S22 of the optical disk 1. And reads desired actual data from the file entity recording area S3 based on the management information.

First, when the formatter 21 sets a data recording area, the FE and FIDs recording areas are determined as shown in a file management information recording area S21 in FIG. 2B. That is, in the file management information recording area S21, the FE of the root directory is arranged in a certain vacant logical block, and the FIDs of the root directory and the FI of the
Ds, FIDs of directory 13 and FIDs of directory 2 are arranged respectively. These FIDs are areas that can be read continuously on the optical disc 1, for example, the same ECC block or the same track.

Further, the FE of the directory 1 and the file 11
FE, FE of file 12, FE of directory 13
Are provided following the above-mentioned FIDs recording area. The recording area of each FE is track or EC
As long as the recording capacity of the C block permits, it is desirable that the data be recorded on the same track or ECC block as the FIDs.

With this format, when the optical disk 1 is loaded and the optical disk device 3 first obtains a desired data structure, the reader 32 reads the information in the volume management information recording area S1 and then reads the same track or the same track. By browsing the file management information recording area S21 in the ECC block, all FIDs and FEs
Information can be obtained at once.

Next, the operation of the optical disk reader according to the present embodiment will be described with reference to FIG. Reader 32
FIG. 3A shows a specific example of the file management information read from the file management information recording area S21 according to. Here, the content of the FID for each FID shown in FIG. 2B is specifically shown. That is, as the FIDs of the root directory, the FID of the directory 1 and the FID of the directory 2 are indicated, and as the FIDs of the directory 1, the FID of the file 11, the FID of the file 12,
The FID of the directory 13 is shown.
The FID of the file 131 is indicated as the FIDs of the file 131. Actually, in order to enable the directory structure to be traced upward, an FID indicating a parent directory is arranged as the first FID of each FID, but is omitted in this description for simplicity.

When such FIDs and FIDs belonging to each FIDs are read from the optical disk 1 by the reader 32, the control device 33 instructs the storage device 31 to store these data. The storage device 31 is shown in FIG.
As shown in (b), the data recorded in LBN3 to LBN5 is held. It is assumed that as much file management information as possible is stored according to the storage capacity given to the storage device 31.

Next, when the user of the optical disk reading device 3 retrieves a target file, the control device 33
Browse the contents of 1. For example, when the existence of the FID of the directory 1 is known from the FIDs of the root, the FID of the directory 1 is browsed, and the FID of the file 11 and the FID of the file 12 are detected. When the data of the file 11 is obtained, the FE of the file 11 is checked. The above access is executed by the operation in the storage device 31. Therefore, the time required for searching for the management information is changed from the access time unit of the reader 32 to the access time unit of the semiconductor memory, and the access is speeded up. In particular, when the file management information belonging to the same parent directory is browsed a plurality of times, the effect of the high-speed access is enhanced.

As described above, the formatter 21 of the optical disk recording apparatus 3 converts the FIDs in which the logical areas FID for managing individual file names and directory names are arranged for each directory with respect to the description of the file management information recording area of the optical disk. Are arranged in an area on the optical disk 1 where continuous reading is possible. Then, the writer 22 of the optical disk recording device 2 records the formatted data on the optical disk 1.

On the other hand, when the optical disk 1 is used, all the file management information is read by one access of the optical disk 1 by the reader 32 of the optical disk reader 3. The file management information read out here is stored in the storage device 31 of the optical disk reader 3. Then, in the subsequent file access processing, when the FIDs stored in the storage device 31 are accessed by the control device 33 of the optical disk reading device 3, the reader 32 is again accessed.
The FIDs stored in the storage device 31 are searched without accessing the optical disk 1 by the FIDs.

According to such a file management method, the access to the optical disk, which occupies most of the time for file access, takes about half the processing time of the conventional method, and the file can be accessed at high speed.

(Embodiment 2) An optical disk, an optical disk recording apparatus, and an optical disk reading apparatus using the file management method according to Embodiment 2 of the present invention will be described. The relationship among the optical disk 1, the optical disk recording device 2, and the optical disk reading device 3 of the present embodiment is the same as that shown in FIG. FIG. 4A is a configuration diagram of the file management information recording area S22 of the present embodiment, and FIG.
Recording area Ai (i = 1, 2,
FIG. 3 is an explanatory diagram showing a relationship with (...). Also in the present embodiment, the optical disc 1 (DVD) has a volume management information recording area S1 in which a volume structure is described, and FIG.
It has a file management information recording area S22 in which a file structure as shown in (b) is described, and a file substance recording area S3 in which data of each file is actually recorded.

In FIG. 4B, FE (Root), which is the FE of the root directory, is described in an empty logical block in the file management information recording area S22, and the FIDs of the root are written in the next empty logical block. As FI
D (DIR 1) and FID (DIR 2) are described. Further, the next two logical blocks include FE (DIR 1) and FE (DIR 2)
Are described respectively. In the structure of the conventional file management information shown in FIG. 12, FE (DIR 2) is described at a position far away from the recording area of FE (DIR 1). Is the same area A that can be read by one access as shown in FIG.
No. 1.

Following this logical block, FID (FILE
11), FID (FILE 12), FID indicating FID (DIR 13)
s (DIR 1) is described in the next free logical block. These FIDs are recorded in an area A2 following the area A1. FE (FILE 11) and FE (FILE 12) are in area A
2 is described in a logical block belonging to the second logical block. Also, FE (DIR
13), FIDs (DIR 13) including FID (FILE 131), FE
(FILE 131), FIDs (DIR 2) including FID (FILE 21) and FID (FILE 22), FE (FILE 21), FE (FILE 22)
Are described in each of the logical blocks belonging to the area A3.

As described above, the formatter 21 of the optical disc recording apparatus 2 uses the reader 32 to read the FIDs in which the logical areas FID for managing individual file names and directory names are arranged for each directory with respect to the description of the file management information recording area. It is arranged in an area that can be read continuously by one access. In particular, information about files and directories belonging to the same directory is placed in the same area, and if there is enough space in that area, information about files and directories belonging to the parent directory and its child directories is then stored in the same area as that area. Or in a region adjacent to that region.

On the other hand, when using the optical disc 1,
Optical disk 1 by reader 32 of optical disk reader 3
All or all of the file management information is read by one or a small number of accesses. The file management information read out here is stored in the storage device 31 of the optical disk reader 3. In this way, disk access, which occupies most of the time for file access, is smaller than in the conventional method, and actual data can be accessed in a shorter processing time than the conventional method.

On the other hand, when the data on the optical disk 1 is further accessed, as shown in FIG. 3B, the control device 33 of the optical disk reading device 3 determines the FIDs of the area stored in the storage device 31. to access. In this way, the FIDs stored in the storage device 31 may be referred to without accessing the optical disc 1 again by the reader 32. If it is not stored in the storage device 31, the optical disk 1 is accessed again to search for a desired logical area.

(Embodiment 3) A file management method according to Embodiment 3 of the present invention will be described. An optical disk 1, an optical disk recording device 2, and an optical disk reading device 3 for realizing the file management method according to the present embodiment.
Are the same as those shown in FIG. 1, and the description of their configuration and operation is omitted, including the following embodiments.

FIG. 5 is a configuration diagram of the file management information in the present embodiment. In this figure, FE (Root), which is the FE of the root directory, is described in an empty logical block in the file management information recording area S23, and the FI of the root directory is written in the next empty logical block.
FID (DIR 1) and FID (DIR 2) are described as Ds. In addition, the next free logical block has FI
Ds (DIR 1) and describe its contents in FID (FILE 11),
FID (FILE 12) and FID (DIR 13).

The next free logical block following the above logical block includes FIDs including FID (FILE 131).
Enter (DIR 13). In addition, the next logical block that is vacant includes FI (FILE 21) and FI (FILE 22) including FID (FILE 22).
Ds (DIR 2) is described. Following this logical block, FE (DIR 1), FE (FILE 11), FE (FILE 12),
FE (DIR 13), FE (FILE 131), FE (DIR 2), FE (F
IRE21) and FE (FILE22) are described.

Unlike the configuration of the file management information shown in FIG. 12 or FIG. 4B, in this embodiment, the FID (DIR
The recording area indicated by FE (DIR 1) can be directly accessed by the pointer P1 of 1). Similarly, FE (DIR 2) pointer P 2 indicates FE (DIR 2).
2) The recording area pointed to by can be accessed directly.

FIG. 6 is an explanatory diagram showing an example of the data structure of the FID. When counted in byte units, an implementation use description area is provided in a portion starting from 38 RBP.
Direct Alloc is added to the part of 64RBP which is a part of this area.
ation is provided and information on the pointer P1 or P2 shown in FIG. 5 may be presented.

Data is created after recording address information indicating the position of each directory on the optical disc 1 in such a direct allocation area. Then, the writer 22 of the optical disk recording device 2 records the data on the optical disk 1.

On the other hand, when using the optical disk 1 described above, the control device 33 of the optical disk reader 3 sets the Direct Allocat in the Implementation Use in the logical area FID.
By referring to the ion, the address information indicating the position of the directory on the optical disk 1 can be directly obtained. Thereafter, a logical area in which the directory is described on the optical disc 1 may be accessed.

As described above, in the present embodiment, the address information indicating the position of each directory on the optical disk 1 is recorded in the logical area FID for managing the directory name of the file recorded in the file entity recording area S3. It is characterized by doing. Conventionally, when trying to follow the directory structure of a file recorded on the optical disc 1, a logical area FE that manages individual file attributes of the file management information recording area S20 is accessed by a pointer recorded in the FID. Further, the pointer recorded in the FE indicates the FID related to the directory.
s is accessed, an FID for managing a desired directory name or file name is searched in the FIDs, and the same process is repeated when trying to further follow the directory structure. However, when the file management method of the present embodiment is used, disk access, which occupies most of the time required for file access, is about half that of the conventional method, and as a result, the processing time is about half that of the conventional method. Data can be accessed.

(Embodiment 4) A file management method according to Embodiment 4 of the present invention will be described. An optical disk 1, an optical disk recording device 2, and an optical disk reading device 3 for realizing the file management method according to the present embodiment.
Are the same as those shown in FIG. 1, and the description of their configuration and operation is omitted.

FIG. 7 is an explanatory diagram showing an example of the data structure of the FID used in the present embodiment. As in the case of FIG. 6, a description area of Implementation Use is provided in a portion starting from 38 RBP. 64 RBs that are part of this area
A column for Indirect Allocation is provided in the part of P, and FIG.
The information of the pointer P1 or P2 shown in FIG. As described above, in the present embodiment, the logical area FID that manages the directory name of a file includes:
It is characterized in that difference information between an address indicating a position on the optical disc 1 where the information is recorded and an address indicating a directory position is recorded.

The formatter 21 of the optical disk recording device 2
Describes the file management information recording area of the optical disc 1 as shown in FIG. And the optical disk recording device 2
The writer 22 records the data on the optical disc 1.

When the optical disc 1 is used, the logical area FID for managing individual directory names
By referring to "Indirect Allocation" in the "entation Use", it is possible to directly obtain address information indicating the position of the directory on the optical disc 1. After this,
What is necessary is just to access the logical area on the optical disc 1 in which the directory is described.

According to this method as well, disk access, which occupies most of the time for file access, is only about half of the conventional method, and as a result, actual data can be accessed in about half the processing time of the conventional method.

(Embodiment 5) A file management method according to Embodiment 5 of the present invention will be described. An optical disk 1, an optical disk recording device 2, and an optical disk reading device 3 for realizing the file management method according to the present embodiment.
Are the same as those shown in FIG. 1, and the description of their configuration and operation is omitted.

FIG. 8A is an explanatory diagram showing the arrangement of file management information created by the formatter 21 used in the present embodiment, and FIG. 8B is a diagram showing the file management information stored in the storage device 31. FIG.

First, the storage device 31 of the optical disk reader 3
Then, file management information that can be continuously read by one access to the optical disk 1 by the reader 32 is stored. In FIG. 8B, the number of data that can be acquired by one access is set to 3 in terms of the number of logical blocks.
Therefore, in the first data transfer, the file management information of the LBNs 2 to 4, ie, FE (Root), FIDs (Root), FIDs
(DIR 1) is stored in the first area M1 of the storage device 31.
Next, by head access, the LBN 1
The file management information of 2 to 14 is read. And FE
(DIR 2), FE (File 21), and FE (File 22) are stored in the second area M 2 of the storage device 31. Then, when there is a free space in the storage device 31, the file management information of the LBNs 6 to 8 is read via the reader 32 by head access. Then, FIDs (DIR 2), FE (DIR 1), FE
(File 11) is stored in the third area M3 of the storage device 31.

Next, the control device 3 of the optical disk reading device 3
If the logical area in the file management information recording area determined to need to be newly accessed according to 3 is already stored in the storage device 31, the area stored in the storage device 31 is referred to. . For example, when accessing file 12, FID (FILE 12) to FE (FILE12)
You can access without going through. When the file 21 is accessed, the FI in the third area M3 of the storage device 31 is
Access is made via D (FILE 21) and FE (FILE 21) in the second area M2.

By repeating the above, the storage device 31
If the logical area of the optical disk 1 stored in the optical disk 1 becomes sufficiently large, the number of times the file management information recording area occupies most of the time for file access to the optical disk 1 needs to refer to the conventional logical area. The number of operations is smaller than the method of accessing the optical disk 1 every time.
In this way, the file can be accessed with less processing time than the conventional method.

(Embodiment 6) A file management method according to Embodiment 6 of the present invention will be described. An optical disk 1, an optical disk recording device 2, and an optical disk reading device 3 for realizing the file management method according to the present embodiment.
Are the same as those shown in FIG. 1, and the description of their configuration and operation is omitted.

FIG. 9A is an explanatory diagram showing the arrangement of file management information created by the formatter 21 used in the present embodiment, and FIG. 9B is a diagram showing the file management information stored in the storage device 31. FIG.

First, the storage device 31 of the optical disk reader 3
Then, the entire area that can be read continuously by one access to the optical disk by the reader 32 is stored.
In the first data transfer, FE (Root), FIDs (Root), and FIDs (DIR) in the file management information of LBNs 2 to 5
1) is stored in the area Ai of the storage device 31. Then LB
FIDs (DIR 2) in the file management information of N6 to N11
, FE (DIR 1) and FE (FILE 11) are stored in the area Aj of the storage device 31 adjacent to the area Ai. Further LBN12
FE (DIR 2) and FE (F
ILE 21) and FE (FILE 22) are stored in the area Ak of the storage device 31 adjacent to the area Aj. In this way, a necessary portion of the file management information of the optical disc 1 is copied without changing its relative recording position (LBN).

Next, the control device 3 of the optical disk reading device 3
If the logical area in the file management information recording area determined to need to be accessed again by 3 is already stored in the storage device 31, the storage area of the storage device 31 is referred to. The access procedure in this case is shown in FIG.
Is the same as In FIG. 9B, the files 12 and the files belonging to the directory 13 are not transferred to the storage device 31 because they are not needed for the time being.

By repeating the above, the storage device 31
If the logical area on the optical disk 1 stored in the optical disk becomes sufficiently large, the number of times of access to the optical disk in the file management information recording area, which occupies most of the time for file access, needs to refer to the conventional logical area. The method requires less access than the method of accessing the optical disk 1 at a given time. In this way, the file can be accessed with less processing time than the conventional method.

(Embodiment 7) A file management method according to Embodiment 7 of the present invention will be described. An optical disk 1, an optical disk recording device 2, and an optical disk reading device 3 for realizing the file management method according to the present embodiment.
Are the same as those shown in FIG. 1, and the description of their configuration and operation is omitted.

FIG. 10A is an explanatory diagram showing the arrangement of the file management information created by the formatter 21 used in the present embodiment. FIG. 10B shows the arrangement of the storage device 31 by the operation of the control device 33. FIG. 4 is an explanatory diagram of stored file management information. Here, each FE is not directly stored in the entry column of the independent LBN of the storage device 31.

First, as in the case of FIG. 5, the formatter 21 reads the LB of the head of the file management information recording area S23.
N, FE (Root), which is the FE of the root directory, is described in the next LBN.
Enter IR 1) and FID (DIR 2). L following it
The BN has FIDs (DIR 11) as FIDs (DIR 11),
FID (FILE 12) and FID (DIR 13) are described. Following the above LBN, FIDs (DIR 1) including FID (FILE 131)
Describe 3). In the next LBN, FID (FILE 21)
, FID (FILE 22), FIDs (DIR 2).

When the reader 32 reads the above file management information, the control device 33 issues an instruction to store information as shown in FIG. 10B as management information of LBN3 to LBN6. Then, FE (DIR 1) is described in a part of the description column of FID (DIR 1). Also, FE (DIR 2) is described as a part of FID (DIR 2). Similarly,
FE (FILE 11) is assigned to FID (FILE 11), and FID (FILE 1
FE (FILE 12) for FID (FILE 131) and FE (FILE 12) for FID (FILE 131).
131) and FE (FILE 21) in FID (FILE 21).

As described above, the optical disk reading device 3 describes the FE, which is the recording destination information of the individual directory in the file management information recording area, in the Implementation Use column of the FID. If the logical area determined to have to be accessed is already stored in the storage device 31, the area stored in the storage device 31 if determined by the control device 33 of the optical disk reading device 3. See In this way, access to the file management information recording area of the optical disk, which occupies most of the time for file access, can be reduced as compared with the conventional method. Also, compared to the conventional method of accessing the optical disk every time it is necessary to refer to the logical area, the file can be accessed in a shorter processing time.

The formatter of the optical disk recording apparatus described above uses a plurality of FIs based on the input actual data.
Although Ds is arranged in an area of the file management information recording area of the optical disc which can be read continuously, there are cases where an optical disc without such consideration is reproduced. In this case, as long as the capacity of the storage device allows, the file management information is stored in the storage device of the optical disk reading device, and if the file entity recording area is accessed using the file management information of the storage device, the file management information is created by the conventional method. High-speed file access can also be expected for optical discs that have been used.

[0079]

As described above, according to the optical disk according to the first, third, fifth, and seventh aspects, when an optical disk created by an optical disk recording device is read by using an optical disk reading device, compared with a conventional method. A desired file can be accessed in about half the processing time. Further, by transferring the file management information to the storage device for the optical disk created by the conventional method, a higher speed file access can be expected as compared with the conventional method.

In particular, according to the optical disk recording apparatus of the second, fourth, sixth, and eighth aspects, it is possible to continuously read the file management information that must be frequently accessed by the optical disk reader by the formatter in the optical disk. Data can be arranged in a simple area. As a result, faster file access can be expected as compared with the conventional method.

According to the optical disk reading device of the ninth to twelfth aspects, the FIDs recorded in the file management recording area of the optical disk are read and temporarily stored in the storage device, so that the recording position of the target file can be newly set. Detection can be easily performed without performing head access. As a result, faster file access can be expected compared to the conventional method regardless of the structure of the file management recording area of the optical disc.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a relationship among an optical disk, an optical disk recording device, and an optical disk reading device of the present invention.

FIG. 2 shows a DVD using the file management method according to the present invention.
FIG. 3 is a configuration diagram of a logical area.

FIG. 3 is a configuration diagram of a DVD reader and file management information according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of file management information according to Embodiment 2 of the present invention.

FIG. 5 is a configuration diagram of file management information according to Embodiment 3 of the present invention.

FIG. 6 is an explanatory diagram showing an example of a data structure of a logical area FIDs for managing a file name and a directory name in the file management method according to the third embodiment.

FIG. 7 is an explanatory diagram showing an example of a data structure of a logical area FIDs for managing a file name and a directory name in the file management method according to the fourth embodiment of the present invention.

FIG. 8 is a configuration diagram of a DVD reading device according to a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram of a DVD reading device according to a sixth embodiment of the present invention.

FIG. 10 is a configuration diagram of a DVD reading device according to a seventh embodiment of the present invention.

FIG. 11 is a configuration diagram of a DVD logical area using a conventional file management method.

FIG. 12 is an explanatory diagram showing the structure of conventional file management information.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical disk 2 optical disk recording device 3 optical disk reading device 21 formatter 22 writer 31 storage device 32 reader 33 control device S1 volume management information recording area S20-23 file management information recording area S3 file entity recording area

Claims (12)

[Claims] An area in which a file including actual data is recorded is defined as a file entity recording area, a logical area for managing file names and directory names of files recorded in the file entity recording area is defined as FID, and the same directory is used. The list of the FIDs for managing the file names and directory names of the files included in the
An optical disc, wherein, when IDs are used and a recording area of the FIDs is used as a file management information recording area, the plurality of FIDs are arranged in a continuously readable area of the file management information recording area of the optical disc. 2. An optical disk recording apparatus for recording information on an optical disk, wherein when the input actual data is recorded in a file entity recording area of the optical disk, the actual data is converted into a predetermined format and the actual data is converted into a predetermined format. A formatter for creating file management information for managing a file name and a directory name of a file in which data is stored; and a file management information recorded by the formatter recorded in a file management information recording area of the optical disc, and And a writer for recording a file including the following in the file entity recording area: The formatter comprises: a FID for storing a logical area for managing a file name and a directory name of the file recorded in the file entity recording area.
FID, which manages the file names and directory names of the files included in the same directory, is
Ds, and when the recording area of the FIDs is a file management information recording area, the plurality of FIDs are arranged in a continuously readable area of the file management information recording area of the optical disc. apparatus. 3. The file management information recording area sequentially stores information on files and directories belonging to the same directory and then information on files and directories belonging to a parent directory and its child directories among the plurality of FIDs. 2. The optical disk according to claim 1, wherein the optical disk is arranged in a readable area. 4. The file management information recording area includes, among the plurality of FIDs, information on files and directories belonging to the same directory, and then information on files and directories belonging to a parent directory and its child directories. 3. The optical disk recording device according to claim 2, wherein the optical disk recording device is arranged in a readable area. 5. A logical area FID for managing a directory name of a file recorded in the file entity recording area.
4. The optical disc according to claim 1, wherein address information indicating a position on the optical disc where FIDs of each directory are recorded is recorded. 6. A logical area FID for managing a directory name of a file recorded in the file entity recording area.
5. The optical disc recording apparatus according to claim 2, wherein address information indicating a position on the optical disc where FIDs of each directory is recorded is recorded. 7. A logical area FID for managing a directory name of a file recorded in the file entity recording area
4. The method according to claim 1, wherein a difference value between an address indicating a position on the optical disc where the FID is recorded and an address indicating a position on the optical disc where FIDs of the directory are recorded is recorded. optical disk. 8. A logical area FID for managing a directory name of a file recorded in the file entity recording area
5. A difference value between an address indicating a position on the optical disc where the FID is recorded and an address indicating a position on the optical disc where the FIDs of the directory are recorded is recorded. Optical disk recording device. 9. An area in which a file including actual data is recorded is defined as a file entity recording area, and a logical area for managing a file name and a directory name of a file recorded in the file entity recording area is defined as an FID. The list of the FIDs for managing the file names and directory names of the files included in the
An optical disc reading device for reading an optical disc having the file entity recording area and the file management information recording area, wherein the recording area of the FIDs is a file management information recording area; A reader for accessing an area and the file management information recording area and reading data recorded in those areas, and a storage device for storing at least a part of the file management information recording area read via the reader Searching the file management information held in the storage device to obtain storage location information of a desired file, and accessing the file entity recording area based on the storage location information to obtain actual data. And a control device for instructing the reader. If the data in the file management information recording area to be accessed is already stored in the storage device, an instruction is given to access the file entity recording area using the stored file management information. Optical disk reader. 10. An area in which a file including actual data is recorded is defined as a file entity recording area, and a logical area for managing file names and directory names of files recorded in the file entity recording area is defined as FID. When the arrangement of the FIDs for managing the file names and directory names of the files included in the file is FIDs of the same directory and the recording area of the FIDs is a file management information recording area, the file entity recording area and the file management information An optical disk reader for reading an optical disk having a recording area, comprising: a reader that accesses the file entity recording area and the file management information recording area of the optical disk and reads data recorded in those areas; Said file tube read out via A storage device for storing at least a part of an information recording area; and searching the file management information held in the storage device to obtain storage location information of a desired file, and based on the storage location information, the file entity. A control device for instructing the reader to access a recording area to obtain actual data, wherein the control device reads the file management information that can be read by only one access of the reader. To give to
If the capacity of the storage device is possible, an instruction is given to give the file management information read out next by the reader to an empty area of the storage device, and the file management information recording area which must be continuously accessed is An optical disk reading device for instructing access to the file entity recording area by using stored file management information when the data is already stored in the storage device. 11. An area in which a file including actual data is recorded is defined as a file entity recording area, and a logical area for managing file names and directory names of files recorded in the file entity recording area is defined as FID. When the arrangement of the FIDs for managing the file names and directory names of the files included in the file is FIDs of the same directory and the recording area of the FIDs is a file management information recording area, the file entity recording area and the file management information An optical disk reader for reading an optical disk having a recording area, comprising: a reader that accesses the file entity recording area and the file management information recording area of the optical disk and reads data recorded in those areas; Said file tube read out via A storage device for storing at least a part of an information recording area; and searching the file management information held in the storage device to obtain storage location information of a desired file, and based on the storage location information, the file entity. A control device for instructing the reader to access a recording area to obtain actual data, wherein the control device reads the file management information that can be read by only one access of the reader. To be stored in an arbitrary area Ai of the storage device, and if possible as the capacity of the storage device, an area Aj continuous with the area Ai of the storage device
And if the data in the file management information recording area that must be accessed continuously is already stored in the storage device, the file entity recording area is accessed using the stored file management information. An optical disk reading device for instructing to read. 12. An area in which a file including actual data is recorded is defined as a file entity recording area, and a logical area for managing file names and directory names of files recorded in the file entity recording area is defined as FID. When the arrangement of the FIDs for managing the file names and directory names of the files included in the file is FIDs of the same directory and the recording area of the FIDs is a file management information recording area, the file entity recording area and the file management information An optical disk reader for reading an optical disk having a recording area, comprising: a reader that accesses the file entity recording area and the file management information recording area of the optical disk and reads data recorded in those areas; Said file tube read out via A storage device for storing at least a part of an information recording area; and searching the file management information held in the storage device to obtain storage location information of a desired file, and based on the storage location information, the file entity. A control device for instructing the reader to access a recording area and obtain actual data, wherein the control device is configured to control the FIDs in the file management information that can be read out by only one access of the reader. Of the file management information read out by the reader, and only the recording area of the FIDs is stored in the storage area. An instruction is given to the free area of the device, and F in the file management information recording area which must be accessed continuously. Ds is if already stored in the storage device, an optical disk reading device, characterized in that an instruction to access the file entity recording area by using the file management information already stored.