JPH04205236A - File managing system for draw type information recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a file management system for a write-once information recording medium, typified by a write-once optical disc or the like.

[Prior Art] In recent years, optical disk file systems that record image data such as documents using large-capacity optical disks have been attracting attention as a new document management means.

Optical discs used in this optical disc file system are often write-once type optical discs that can record only -degrees.

By the way, in order to record image data etc. as a file, it is necessary to record the file data, which is the substance of the image data, and the attribute information (file directory) of the file data, such as the file name, data recording start address, data size, and type. There is a need to. File data is compressed using the Modified Huffman method and has an undefined length. Therefore, when recording file data and attribute information, the recording area of the optical disc is divided into a fixed length data recording area and an attribute information recording area. the file data or attribute information from one end of the recording area.
If you set the other one from the middle of the recording area,
The recording capacity of write-once optical discs tends to be wasted. In order to deal with this point, for example, as described in Japanese Patent Application Laid-Open No. 59-178880, file data and attribute information are recorded from both ends of the recording medium.
2. Description of the Related Art Technical ideas that allow storage capacity to be used without waste have been known for some time.

On the other hand, recording of file data and attribute information on a write-once optical disc is performed in units of one sector in response to a request from the minimum information unit handled by the OS of the system. Therefore, a data recording method is adopted in which the recording area of an optical disc is divided into a data recording area and an attribute information recording area, and each time file data is recorded in the data recording area, the attribute information of the file data is recorded in the attribute information recording area. Therefore, one attribute information must be recorded in one sector. In order to read file data from an optical disc having such a file management system, attribute information must be read from the same number of sectors as the number of file data recorded in the data area, and this process takes time, resulting in a slowdown in the read processing speed. This was a factor that hindered the improvement of Conventionally, in order to deal with this inconvenience, focusing on the fact that one sector of an optical disk is several times larger than the amount of information of one attribute information, a plurality of pieces of file data and attribute information corresponding thereto are recorded. At a later point, multiple pieces of attribute information that have already been recorded will be combined into one
A file management method has also been proposed that reduces the number of sectors needed to read out attribute information and shortens processing time by collecting attribute information for sectors and rerecording it in a separate predetermined recording area. There is.

[Problem to be solved by the invention] However, according to this method, one piece of attribute information
Since both an attribute information recording area for recording each sector and another recording area (pack attribute information recording area) for recording new attribute information grouped into one sector are required, the recording capacity of the optical disc is The problem was that the amount of waste was increasing.

The present invention has been made in view of the above points, and its objects are to provide a file management method that can speed up the process of comparing attribute information without wasting storage capacity; The purpose of this invention is to provide a data recording method to realize this.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a data recording area in which file data such as image data is sequentially written;
A write-once information recording medium having an attribute information recording area in which attribute information of the file data is sequentially written sector by sector, the write-once information recording medium having a head of the data recording area and a head of the attribute information recording area. In a file management method in which files are located at both ends of a recording area of a recording medium, file data and its attribute information are added together as one in the data recording area, and the attribute information is written in each sector of the attribute information recording area. Added multiple items at once.

Further, the present invention is a write-once type information recording medium having a data recording area in which file data such as image data and its attribute information are sequentially recorded, and an attribute information recording area in which attribute information of the file data is sequentially recorded sector by sector. In a file management method in which attribute information of the file data is copied to a memory provided outside the recording area of the write-once information recording medium and managed, the attribute information is copied to the memory and recorded in the attribute information recording area. Every time the number of unused attribute information reaches a predetermined number, the attribute information is read from the attribute information recording area on the memory and summarized into one sector worth of attribute information, and the free space in the attribute information recording area is [Operation] When multiple pieces of attribute information are recorded in each sector of the attribute information recording area, it is easier to record one attribute information per sector than when one attribute information is recorded in each sector. Since the attribute information recording area can be made smaller, the recording capacity of the data recording area can be substantially increased.

In addition, if multiple pieces of attribute information are recorded in each sector of the attribute information recording area as described above, the number of sectors for reading the attribute information is reduced, so the information read processing time is reduced. Can be shortened.

On the other hand, the attribute information is not recorded in the attribute information recording area each time file data is recorded, but each time a predetermined number of file data is recorded, the attribute information of those file data is collectively recorded in the attribute information recording area. By recording in the first sector of the free area of the information recording medium, it is not necessary to provide an area for recording one attribute information for each sector in the recording area of the information recording medium, so the above-mentioned file management method can be realized. .

[Embodiment 1] Hereinafter, an example of a file management system for a write-once information recording medium according to the present invention will be explained by taking a write-once optical disc as an example.

Fig. 1 is an explanatory diagram schematically showing the allocation of recording areas of a write-once optical disc and the structure of data recorded in each allocated area, Fig. 2 is a plan view of the write-once optical disc, and Fig. 3 is an attribute diagram. FIG. 2 is an explanatory diagram schematically showing an example of information and the structure of a data area.

As shown in Figures 1 and 2, the recording area 1 of a write-once optical disc records the volume name of the optical disc, the date of first use, etc., and the system area 2 is used exclusively by the system, and the system area 2 is used exclusively by the system for data storage. A user recording area 3 that can be used for recording is provided. The user recording area 3 is provided with a data recording area 6 in which file data 4 of undefined length and its attribute information 5 are sequentially recorded, and an attribute information recording area 7 in which only the attribute information 5 is sequentially recorded. The head of the data recording area 6 and the head of the attribute information recording area 7 are positioned at both ends of the user recording area 3, respectively. Note that reference numeral 8 in the figure indicates an unrecorded area in the user recording area 3, and the entire user recording area 3 is the unrecorded area 8 in the initial state.

Recording area 1 is divided into a number of sectors, which are the minimum information units handled by an optical disc file (optical disc recording/playback device).By specifying the unique sector number assigned to each sector, the corresponding sector number can be specified. Data can be input and output to the sector. In this embodiment, as shown in FIG. 1, a plurality of pieces of attribute information 5 (five in the example of FIG. 1) are recorded in each sector of the attribute information recording area 7. There is. That is, every time five pieces of file data 4 and their attribute information 5 are added to the data recording area 6, one sector of the attribute information recording area 7 is recorded.
Attribute information 5 of these five file data 4 is added together. Although it is added to the data recording area 6,
If the number of file data 4 that has not been added to the attribute information recording area 7 is less than five, those attribute information 5 are only added to the data recording area 6 and are not added to the attribute information recording area 7. is not added.

Attribute information 5 includes ID number 10, as shown in FIG.
, file or directory name 11, data storage location (starting address) 12, date when the file was recorded 13, data capacity 14, flag 1 indicating whether it has been deleted or not
5, a flag 16 indicating whether it is a directory or a file, and a storage position 17 for the next file. A major feature of this embodiment is that the attribute information 5 includes the storage location 17 of the next file.

Next, the data recording method according to the present invention is illustrated in FIGS. 4 to 11.
This will be explained using figures.

Figure 4 is an overall configuration diagram of an optical disk file system that implements the data recording method of the present invention, Figure 5 is an explanatory diagram showing the process of copying attribute information from the optical disk to memory, and Figure 6 is the process of reading a file. FIG. 7 is an explanatory diagram showing the file writing process. FIG. 8 is an explanatory diagram showing the attribute information writing process to the attribute information recording area.
Figure 10 is a flowchart showing the procedure for copying attribute information from an optical disc to memory, Figure 10 is a flowchart showing the procedure for reading a file, and Figure 11 is a procedure for writing a file and writing attribute information to the attribute information recording area. It is a flow chart showing a processing procedure.

As shown in Figure 4, the optical disk file system is
A central processing unit (CP) 21 that controls the entire system, an optical disk file 22 that uses a write-once optical disk that registers image data, etc., and various types of memories 23 and 24.
a compression/expansion processor 25; a scanner 26 for capturing image data to be registered in the optical disk file 22;
It is comprised of a display 27 that displays image data and text data such as menus, and a keyboard 28 that inputs commands, image indexes, and the like. memory 2
3 includes a control program for operating the CPU 21;
Variables and tables used by the CPU 21, temporal image data, etc. are stored, and the recorded contents of the bitmap memory 24 are in one-to-one correspondence with the images displayed on the display 27.
It corresponds to Then, the CPU 21 uses the scanner 26
The captured image data is transferred to the optical disk file 22, and the optical disk file 22 records file data 4, which is the substance of the image data, and its attribute information 5 on the write-once optical disk. There is.

Of course, since the recording area l of an optical disk is divided into a large number of sectors, and each sector is assigned a unique sector number, the system of this embodiment also allows data input/output using only this sector number. It is assumed that the address can be specified.

In the above configuration, when an optical disk is loaded into the optical disk file 22, the attribute information on the optical disk is copied to the memory 23 provided in the optical disk file system. The copy processing procedure will be explained with reference to the flowchart of FIG. 9 and the explanatory diagram of FIG. 5.

First, in step S-1, all the attribute information 5 recorded in the attribute information recording area 7 of the optical disc is read out by the optical disc file 22 and copied to the memory 23 provided in the optical disc file system. As mentioned above, in the attribute information recording area 7, a plurality of pieces of attribute information 5 are recorded for each sector, so one piece of attribute information 5 is recorded for each sector.
The number of read sectors can be significantly reduced compared to the case where one piece of attribute information is recorded, and copying to the memory 23 can be performed at high speed.

Next, in step S-2, the "next file position 17" is read out for the last attribute information 5 among the attribute information 5 copied to the memory 23, and the next file is recorded at the address. A check is made to see if the answer is yes or not, and the process proceeds to step S-3.

In step S-3, it is determined whether the next file is recorded in the "next file position" of the last attribute information 5 copied to the memory 23. If there is a next file, in step S-4, the data recording area 6 of the optical disc is
The attribute information of the next file is read out, and the attribute information is copied to the memory 23. After that, the process returns to step S-2 again, and steps S-2 to S are performed until it is determined that the next file is not recorded in the "next file position" of the attribute information 5 newly copied to the memory 23. -4 operation is repeated.

If it is determined in step S-3 that there is no next file, this means that the attributes of all file data recorded on the optical disk have been copied to the memory 23, and the copying process ends.

After the above-described copying process is completed, it is possible to read file data recorded on the optical disc or write file data to the optical disc according to a command from the user. The procedure for reading file data recorded on an optical disc will be described below with reference to the flowchart in FIG. 9 and the explanatory diagram in FIG. 5.

In step 5-11, when you search for the file data you want to read, a search command is issued from the CPUI.
The attribute information stored in the memory 23 is searched, and in step 5-12, it is determined whether the attribute information corresponding to the searched file data is stored in the memory 23.

In step 5-12, the searched file is stored in memory 2.
If it is determined that the file data is stored on the file 3, the process proceeds to step 5-13, and the storage location and capacity (data size) of the file data are extracted from the retrieved desired attribute information.

Next, the optical disk file 22 is driven based on the extracted storage position information and capacity information, and the file data is read out from the data recording area 6 of the optical disk (step S-14) and displayed on the display 27, for example. ,
Finish the read process.

If it is determined in steps S-12 that the file does not exist, error processing is performed in step 5-15, and the reading process is ended.

Next, the write processing procedure for recording file data on the optical disc will be explained with reference to the flowchart of FIG. 11 and the explanatory diagrams of FIGS. 7 and 8.

When file data such as image data is taken in from the scanner 26, the file data is transferred to the bitmap memory 24 and displayed on the display 7. Here, when the user inputs a search index such as the name of file data to be used for later searching using the keyboard 8 and instructs the start of the writing process, the writing process is started.

First, in step 5-21, the compression/decompression processor 25
The file data is compressed using the Modified Huffman method, etc., and is temporarily stored in the memory 23, and the storage location, capacity, etc. of the recorded file data are set together with the name of the file data entered from the keyboard 28. The attribute information is recorded at the beginning of the free area of the data recording area 6 (at the beginning of the unrecorded area 8 following the recorded data recording area), and the process proceeds to step 5-22.

In step 5-22, the attribute information recorded in the data recording area 6 is recorded at the beginning of the free area of the memory 23, and the process proceeds to step 5-23.

In step 5-23, it is determined whether the number of attribute information recorded only in the data recording area 6 and not recorded in the attribute information recording area 7 is less than a predetermined number (five in this embodiment). Ru.

If it is determined in step 5-23 that the number of attribute information not recorded in the attribute information recording area 7 has reached five, the process proceeds to step 5-24, and those attributes are recorded from the attribute information recording area on the memory. The information is read out and summarized as one sector's worth of information.

Then, in step 5-25, the information is recorded at the beginning of the free area of the attribute information recording area 7 (at the beginning of the unrecorded area 8 following the recorded attribute information recording area), and the writing process is completed.

If it is determined in step 5-23 that the number of pieces of attribute information not recorded in the attribute information recording area 7 is less than five, the writing process is immediately terminated.

As described above, according to the data recording method of this example, attribute information is not recorded in the attribute information recording area each time file data is recorded, but each time a predetermined number of file data is recorded, those files are recorded. Since the attribute information of the data is collectively recorded in the first sector of the free area of the attribute information recording area, there is no need to provide an area for recording one attribute information for each sector in the recording area of the information recording medium. The above file management method can be implemented.

In the above embodiment, the attribute information is copied to the memory provided in the optical disk file system, but the memory is embedded outside the recording area of the optical disk, for example, in a disk cartridge that rotatably stores the optical disk, and the attribute information is copied to the memory provided in the optical disk file system. It is also possible to copy attribute information.

Furthermore, in the embodiments described above, an optical disk was used as the information recording medium, but other types of information recording medium such as an optical card may also be used.

Further, in the above embodiments, a write-once optical disc is used as the information recording medium, but other types of information recording media such as a rewritable optical disc may also be used.

[Effects of the Invention] As explained above, according to the file management method of the present invention, the beginning of the attribute information recording area and the beginning of the file data recording area are positioned at both ends of the recording area of the write-once information recording medium, and Since a plurality of pieces of attribute information are recorded in one sector in each sector of the attribute information recording area, data can be recorded in the data recording area without waste. In addition, since multiple pieces of attribute information are recorded in each sector of the attribute information recording area, the number of sectors for reading attribute information is reduced, and the processing time for reading information can be shortened. .

In addition, the attribute information is not recorded in the attribute information recording area each time file data is recorded, but each time a predetermined number of file data is recorded, the attribute information of those file data is collectively recorded in the attribute information recording area. Since the attribute information is recorded in the first sector of the free area of the information recording medium, there is no need to provide an area for recording one attribute information for each sector in the recording area of the information recording medium, and the above-mentioned file management method can be realized. .

[Brief explanation of the drawing]

The figures relate to one embodiment of the present invention, and FIG. 1 is an explanatory diagram schematically showing the allocation of recording areas of a write-once optical disc and the structure of data recorded in each allocated area, and FIG. 3 is an explanatory diagram schematically showing an example of attribute information and the structure of a data area. FIG. 4 is an overall configuration of an optical disk file system that implements the data recording method of the present invention. 5 is an explanatory diagram showing the process of copying attribute information from the optical disk to the memory, FIG. 6 is an explanatory diagram showing the file reading process, FIG. 7 is an explanatory diagram showing the file writing process, and FIG. 9 is an explanatory diagram showing the process of writing attribute information into the attribute information recording area, FIG. 9 is a flowchart showing the procedure of copying the attribute information from the optical disc to the memory, FIG. FIG. 11 is a flowchart showing the procedure for writing a file and the procedure for writing attribute information into the attribute information recording area. 1... Recording area of write-once optical disc, 2...
...System area, 3...User recording area,
4...File data, 5...Attribute information, 6...Data recording area, 7...Attribute information recording area, 8...Unrecorded area , 17...
・Next file storage location, 23...Tap/Memory. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 Figure 11

Claims (4)

[Claims] (1) A data recording area in which file data such as image data is sequentially added, and attribute information of the file data
A write-once information recording medium having an attribute information recording area in which data is sequentially written on a sector-by-sector basis, wherein the beginning of the data recording area and the beginning of the attribute information recording area are located at both ends of the recording area of the write-once information recording medium. In the file management method, file data and its attribute information are added together in the data recording area, and a plurality of pieces of the attribute information are collectively added to each sector of the attribute information recording area. A file management method for a write-once information recording medium. (2) A write-once information record according to claim 1, wherein the attribute information includes at least a file name, a data recording start address, a data size, and a data recording start address of the next file. Media file management method. (3) A write-once information recording medium having a data recording area in which file data such as image data and its attribute information are sequentially recorded, and an attribute information recording area in which attribute information of the file data is sequentially recorded sector by sector. In a file management method in which attribute information of the file data is copied to a memory provided outside the recording area of the write-once information recording medium and managed, the attribute information is copied to the memory and recorded in the attribute information recording area. Every time the number of unused attribute information reaches a predetermined number, the attribute information is read from the attribute information recording area on the memory and summarized into one sector's worth of attribute information, and the empty area of the attribute information recording area is A file management method for a write-once information recording medium, characterized in that additional writing is performed in the first sector of the file. (4) A write-once information record according to claim 3, wherein the attribute information includes at least a file name, a data recording start address, a data size, and a data recording start address of the next file. Media file management method.