KR20050015156A - Optical disc and recording method of File Information of optical disc - Google Patents

Abstract

PURPOSE: An optical disk and a file information recording method of the optical disk are provided to suggest a method for recording file information including various link information, and to easily carry out forward/reverse searching processes among each file or within the files, thereby reducing a random access time. CONSTITUTION: File information is recorded by being distinguished into file recorders for recording file attributes and disk area recorders having position information on data recorded within a disk by interworking with the file recorders. PL(Previous Link) information and NL(Next Link) information are recorded within the file information. The disk area recorders have position information on a previous disk area recorder and a next disk area recorder. The file recorders have position information on a previous file recorder and a next file recorder.

Description

Optical disc and recording method of File Information of optical disc}

The present invention relates to a method of recording file information on a recordable optical disc, and more particularly, to a method of recording related information in the file information to facilitate the search of data and a file search method through the same.

As optical recording media, optical disks capable of recording large amounts of data are widely used. Recently, new high-density optical recording media (HD-DVD), for example, Blu-ray Disc, which can record and store high-quality video data and high-quality audio data for a long time, have been developed.

Blu-ray Disc, the next-generation HD-DVD technology, is a next-generation optical recording solution that can store data that significantly surpasses existing DVDs. Recently, world-standard technical specifications have been established.

Blu-ray Disc, one of the world's next-generation HD-DVD world standards, uses a 405nm blue-violet laser, which is much denser than current DVDs that use 650nm red lasers, and has a thickness of 1.2mm and a diameter of 0.1mm. A 12cm disc can hold a greater amount of data than a current DVD.

A variety of standards related to Blu-ray Discs are being prepared, followed by a rewritable 1x Blu-ray Disc (BD-RE), followed by a rewritable data-only Blu-ray Disc (BD-DATA) and a rewritable High-speed Blu-ray Disc (BD-RE). And various standards for Blu-ray Discs (BD-WOs) that can be written once.

Therefore, it is necessary to cope with future data-only and high-speed (more than 2x) BD-RE / WO. Therefore, there is an urgent need for efficient countermeasures for recording file information (also called file information or file system) on high-density optical discs. In particular, it should be provided as standardized information to ensure mutual compatibility.

In general, an optical disc has an area for recording file information for managing data recorded on the disc. The file information is information for use by a host or a user and is essential for the management of files recorded on the disc. will be.

FIG. 1 schematically illustrates a conventional method of recording general file information, and has a tree or hierarchy structure. That is, the file is divided into a data file and a directory file, but the directory file is not a file directly including data, but has a structure having another directory file and a data file below.

For convenience of explanation in FIG. 1, the circled portions correspond to directory files (files 1, 2, 5, 6), and the squared portions correspond to data files (3, 4, 7, 8). , File 9). Especially in case of directory file 1, it is not included in the upper directory. It is also called "Root Directory" and all file information starts from "Root Directory".

The conventional general file information recording structure as shown in FIG. 1 may be variously modified as necessary. In particular, it is necessary to define a file information structure corresponding to a new optical disc standard such as a Blu-ray disc type. In the basic file information structure as shown in FIG. 1, a method of recording related information for facilitating search between files and within a file is presented.

The present invention was created in view of the above circumstances, and aims to propose a new method of recording file information as standardized information. In particular, it efficiently records search-related information in the file information, and efficiently records the optical disc from the recorded file information. Its purpose is to perform searching and recording and playback, and has the following technical problems.

By providing file information in a standardized way in a specific area of the disc, we want to provide mutual compatibility between discs in the same series.

Another object of the present invention is to provide a file search method and a recording / reproducing apparatus of an optical disc, which make it easy to search between and within files using recorded file information.

The method for recording file information of an optical disc according to the present invention for solving the above technical problem is a method of recording file information in a disc, wherein the file information includes a file recorder for recording file attributes of the file, and the file. It is characterized in that it is divided into a disc area recorder having position information of the data recorded in the disc in association with the recorder, and the previous link information PL and the next link information NL are recorded in the file information.

 An optical disc according to the present invention further includes an area in which user data is recorded and an area in which file information for management of user data is recorded, wherein the file attribute of the file is recorded in the area in which the file information is recorded. The file recorder is divided into a record area in which a disk area recorder is recorded in association with the file recorder and informs the position of data recorded in the disc. In the area where the file information is recorded, the previous link information (PL) and the next are recorded. It characterized in that the area for recording the link information (NL) is provided,

Further, the file searching method of the optical disc according to the present invention, when the optical disc is loaded, reads the file information recorded in the predetermined area in the optical disc, and also the position information of the previous and next file information recorded in the predetermined area in each file information. And reading and storing the data, and performing a backward and forward search in and between files by referring to the stored location information of the previous and next file information.

In addition, the recording and reproducing apparatus of the optical disc according to the present invention includes a control unit for transmitting a recording command for recording to a specific area of the disc, receiving the recording command, and recording in a specific area according to the recording command, File information, including a file recorder for recording the file attribute of the specific area, and a disk area recorder having position information on the specific area in which data is recorded in association with the file recorder, are recorded in the file information management area in the disk. However, it is characterized in that the file information comprises a recording and reproducing unit for recording the previous link information (PL) and the next link information (NL).

The file recorder may be link information, and may include position information of a previous file recorder, a next file recorder, and a higher file recorder. The disk area recorder is link information, and the position of the previous disk area recorder and the next disk area recorder. It is characterized by having information.

       Hereinafter, exemplary embodiments of a file information recording method and an optical disk file searching method of an optical disk according to the present invention will be described in detail with reference to the accompanying drawings. The present invention will be described taking the case of a recordable Blu-ray disc (BD-RE / BD-WO) as an example.

In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, The present invention is to be understood as the meaning of terms rather than names.

Fig. 2 shows the structure of the optical disc according to the present invention, and the optical disc to which the present invention is applied is sufficient if a recordable optical disc is sufficient, and it can be applied regardless of whether it is an optical disc that can be rewritable many times or once.

In FIG. 2, a lead-in and a lead-out area are provided as a management area in the inner and outer areas of the disc, and a data area between the lead-in area and the lead-out area. Is provided, and an area for recording file information related to the present invention is provided in the data area. In particular, an area for recording file information is divided into two parts, and is divided into an MIA area (Management Information Area) for recording actual file information and an AIA area (Anchor Information Area) for recording location information of the MIA area, and an AIA area. The position of is preset to a standardized value. Therefore, when the optical disc shown in Fig. 2 is loaded, the recording and reproducing apparatus (FIG. 6) first checks the position of the MIA region by reproducing the AIA region at the normalized position, and the file previously recorded by reproducing the MIA region from the position. Obtain information and provide it to the host or user.

The file information recorded in the MIA area may exist in a variety of tables. The present invention has the following structure in order to facilitate searching between files and within files. First of all, there is MIA-Map which shows the location information of various tables of MIA area and the structure of the entire MIA area, and is linked to data file and file table having information for each file. It consists of a Disc Region Table that informs the location information on the disc where data is recorded, and a File Name Table that stores file names. The newly defined table will be able to be identified through the location information in the MIA map information.

There is file table header information for recognizing that a file table is included in the file table, and there are a plurality of file records for recording file attributes corresponding to each file (directory file or data file). exist. "File attribute" is information that indicates the type of file and the nature of the file. For example, the term "file type" is used collectively for information such as file type or write protect or read protect. For example, various information may be included according to a standardized definition.

In the disk area table, there is a disc region table header information for recognizing that the disk area table, and if the file recorder in the file table is a data file recorder, at least one area is allocated to the corresponding data file. There are a plurality of disc region recorders for recording the position information in the disc on which the recorded data is recorded.

The file name table contains name information corresponding to each file.

Hereinafter, a method of recording file information for facilitating the file search of the present invention will be described in detail with reference to FIGS. 3 to 5.

Fig. 3 shows an example of a file information structure to which the present invention is applied, and Fig. 4 shows in detail the structure in which a specific file (directory file k, data file k + 1) is recorded in the file table in the case of Fig. 3. 5 shows the structure of the disk area table linked to the data file k + 1 in detail.

First, FIG. 3 shows a case where x, k, c, d is a directory file and a, b, k + 1, e, f is a data file. As defined in FIG. 1, a directory file may have another directory file and a data file as a sub file, but a data file may not have a sub file and has a disk area table related to position information of data recorded in the file. Therefore, although the disk area table is shown only in the data file k + 1 in FIG. 3 for convenience of explanation, it will be obvious that the remaining data files a, b, e, and f have the disk area table as well.

The present invention is characterized by having link information between files in order to facilitate file searching between and within files. Link information can exist in various ways according to the definition. In the present invention, the previous link information (Previous Link; PL) and the next link information (Next Link: NL) are used to facilitate file search in both the reverse direction and the forward direction. ), Upper link information (Parent Link; PAL), and lower link information (Child Link; CL).

In particular, in the case of data files (a, b, k + 1, e, f), since there are no subfiles, sublink information (CL) is not necessary. In the case of directory files x and k, 4 and 3 subordinates, respectively Have a file, but link only the first subfile with sublink information (CL). In the case of the disk area recorder in the disk area table, only the previous link information (PL) and the next link information (NL) exist as information existing in one file, and there is no upper / lower concept among them. ) And sublink information CL are not applied.

Therefore, all file recorders and disc area recorders contain link information corresponding to each case, so that a link relationship is formed as shown in FIG. 3, and the system can search forward and backward at any time.

FIG. 4 is a diagram showing a file table structure applied to the case of the directory file k and the data file k + 1 and the recording format in each file recorder in FIG.

The directory file k is recorded in the file recorder k in the file table, and the data file k + 1 is recorded in the file recorder k + 1 in the file table.

In relation to the present invention, one file recorder records file name information, file type information, and link information, and it is natural that various information may be recorded in the file recorder as needed.

First, the contents recorded in the file recorder (k) will be described. Then, the location information (File Name Record Number) of the file name recorder in the file name table in which information on the file name is recorded will be recorded, and then all files (directories). Areas for recording the next link information NL, the previous link information PL, and the upper link information PAL as the link information commonly included in the file or data file) are allocated. Referring to FIG. 3, in the case of the directory file k, the upper link information PAL means x as an upper directory file, and this information records the position of the file recorder x in which the upper directory file x is recorded. , Denoted "File Record number". This recording method is equally applicable to other link information. The next link information NL is a file located after the directory file k among the files under the upper directory file x, and becomes the data file a in FIG. 3, and similarly links the position of the file recorder a in which the data file a is recorded. Done. The previous link information (PL) is information that links a file located before the directory file k among the files under the upper directory file x, but in FIG. 3, a file does not exist before the directory file k. FFFF) to indicate that this file is the first entry under the parent directory file.

The next link information (NL). Previous link information (PL) and upper link information (PAL) are link information that is applied in common without distinguishing whether a file is a directory file or a data file. Next, the lower link according to the corresponding file recorder type (File Record Type) The presence or absence of recording of the information CL is determined. That is, the directory file k can have subfiles because the file recorder type corresponds to the "directory file". Therefore, the first file of the subfiles is linked as the sublink information (CL). The lower link information CL of k becomes a directory file d.

Next, when the contents recorded in the file recorder (k + 1) are described, the location information (File Name Record Number) of the file name recorder in the file name table in which the information on the file name is recorded is recorded, and then, An area for recording the next link information NL, the previous link information PL, and the upper link information PAL is allocated. Referring to FIG. 3, in the case of the data file k + 1, the upper link information PAL means k as the upper directory file, and the next link information NL indicates the data file k + 1 among the files under the upper directory file k. The file located next is the data file e in FIG. 3, and the previous link information PL is information linking the file located before the data file k + 1 among the files under the upper directory file k. Directory file d.

Next, whether or not to record sublink information (CL) information is determined according to the file recorder type. That is, since the file recorder type corresponds to the "data file", the data file k + 1 cannot have subfiles, so the sublink information (CL) does not exist. Instead, the location of the actual data recorded in the corresponding data file k + 1. At least one disc area recorder designating a symbol is specified, and the file recorder k + 1 links the position of the first disc area recorder as the "Disc Region Record Number" to the file recorder k + 1. This is the case where the file k + 1 has three disk area recorders 1, 2, and 3, of which the position of the first disk area recorder 1 is recorded in the file recorder k + 1.

FIG. 5 shows the detailed structure of the disc area recorders (1), (2), and (3) linked to the data file k + 1 in the case of FIG.

First, the disk area recorders (1), (2), and (3) have a "Strat logical block number" that indicates to which position the data recorded in the corresponding data file k + 1 is recorded on the disk for its original purpose. Each has "End logical Block Number" and "Start offset" and "End offset" information for accurate positioning. Therefore, if the system wants to play the data file k + 1, the "Strat logical block number" and "End logical block number" and "Start offset" recorded in the disc area recorders (1), (2) and (3) and The complete data file k + 1 is played by reproducing the corresponding area by referring to the "end offset" information.

Each of the disc area recorders 1, 2, and 3 has previous link information PL and next link information NL as link information. That is, in the case of the disc area recorder 1, since the first entry of the data file k + 1 has no corresponding information in the previous link information PL, a specific value (for example, #FFFF) is recorded to record the first entry. Next, the next link information NL designates the next disc area recorder. In FIG. 3, the disc area recorder 2 becomes a position. In the case of the disc area recorder 2, the previous link information PL becomes the position of the disc area recorder 1 as the previous disc area recorder, and the next link information NL is the disc area recorder 3 as the next disc area recorder. ) Position. Finally, in the case of the disc area recorder 3, the previous link information PL becomes the position of the disc area recorder 2 as the previous disc area recorder, and in the next link information NL, the disc area recorder 3 is the data file k. Since it is the last entry of +1, there is no corresponding information, so a specific value (for example, #FFFF) is recorded to indicate the end.

As can be seen from Figure 3 to Figure 5 the present invention has the advantage that it is possible to easily search for both forward and reverse when searching the file by recording the link information between each file and even within the file.

Fig. 6 relates to a recording / playback apparatus for an optical disk to which the present invention is applied. The recording / playback apparatus includes a recording / playback section 10 for recording and playback on an optical disk and a control section 20 for controlling the playback. The control unit 20 issues a recording or reproducing command to the recording / reproducing section 10 to the specific area, and the recording / reproducing section performs recording / reproducing to the specific area according to the command of the control section. Specifically, the recording and playback section 10 includes an interface section 12 for communicating with the outside, a pickup section 11 for directly recording or reproducing data on an optical disc, and a playback signal received from the pickup section. A data-processor 13 for restoring a signal value or modulating a signal to be recorded into a signal recorded on an optical disk, and transferring the data-processor 13 to pick up a signal accurately from the optical disk or to accurately record a signal on the optical disk. Servo unit 14 for controlling unit 11, memory 15 for temporarily storing various information and data including management information, and microcomputer 16 for controlling the components in the recording / reproducing unit 10. It consists of.

The process of recording file information and searching for a file using the recorded file information in the above optical recording and reproducing apparatus will be described in detail as follows.

The optical disc recording / reproducing section 10 receives a recording command for recording in a specific area of the disc from the control unit 20, records in a specific area according to the recording command, and then records the file information in the file information in the disc. Recording in a predetermined area (e.g., AIA area and MIA area), a file recorder for recording the file attributes and the structure of a specific area in which the recording command is executed, and the recorded data in the disk. Including at least one disc region recorder having position information, and recording various link information of the present invention in the file recorder and the disc region recorder in consideration of the relation of the file information already recorded. 4 and 5, the recording process is completed and the recording operation is completed.

Thereafter, when the optical disc on which the above file information is recorded is loaded, the microcomputer 16 reads the file information recorded in the predetermined areas (for example, the AIA area and the MIA area) in the optical disc, and also the predetermined information in each file information. As the link information recorded in the area, the position information of the previous and next file information and the upper and lower file information is read and provided to the controller 20 and temporarily stored in the memory 15, and the file search of the controller 20 is performed. On request, the stored link information is referred to to perform reverse and forward searching in and between files.

As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.

The present invention has proposed a method of recording file information including various link information in a high density optical disk, and through this, it is easy to search forward and backward between each file, which reduces random access time. This has the advantage of being able to cope efficiently with the recording and reproduction of the optical disk as a whole.

Figure 1 shows a simplified structure of a conventional general file information,

2 illustrates a method in which file information is recorded on an optical disk to which the present invention is applied;

3 shows an example of the structure of file information to which the present invention is applied;

4 illustrates an example in which a file table of file information is recorded according to the example of FIG.

FIG. 5 shows an example in which a disk area table of file information is recorded according to the example of FIG.

Fig. 6 shows an optical disc recording and reproducing apparatus for recording file information and performing file search according to the present invention.

Claims (16)

In the method of recording file information on a disc, The file information is divided into a file recorder for recording a file attribute of a corresponding file and a disc area recorder having position information of data recorded in the disc in association with the file recorder, and the previous link information ( PL) and next link information (NL) are recorded. The method of claim 1, And the disc area recorder has link information and has position information of a previous disc area recorder and a next disc area recorder. The method of claim 1, And the file recorder has link information and includes position information of a previous file recorder, a next file recorder, and a higher file recorder. The method of claim 3, wherein And the file recorder is divided into a data file recorder and a directory file recorder. The method of claim 4, wherein And the data file recorder has positional information of a linked disk area recorder. The method of claim 4, wherein And the directory file recorder is link information and has location information of a first file recorder of lower files. In an optical disc having an area in which user data is recorded and an area in which file information for management of user data is recorded, In the area where the file information is recorded, a file recorder for recording a file attribute of a corresponding file is divided into an area in which a disk area recorder for informing the position of data recorded in the disk in association with the file recorder is recorded. And an area for recording previous link information (PL) and next link information (NL) in an area in which file information is recorded. The method of claim 7, wherein And the position information of a previous disk area recorder and a next disk area recorder as link information in an area in which the disk area recorder is recorded. The method of claim 7, wherein And an area for recording position information of a previous file recorder, a next file recorder, and a higher file recorder as link information in an area in which the file recorder is recorded. When the optical disc is loaded, reading the file information recorded in the preset area in the optical disc, and reading and storing the location information of the previous and next file information recorded in the preset area in each file information; And searching backwards and forwards within a file and between files by referring to the stored location information of the previous and next file information. The method of claim 10, And the file information comprises a file recorder for recording a file attribute of a corresponding file, and a disc area recorder having position information of data recorded in the disc in association with the file recorder. The method of claim 11, And position information of a previous and next disc area recorder is recorded in the disc area recorder. The method of claim 11, And the position information of the previous and next file recorders and the position information of the upper file recorder are recorded in the file recorder. A control unit which transmits a recording command for recording in a specific area of the disk; Receiving the recording command, recording in a specific area according to the recording command, and a file recorder for recording the file attributes of the specific area in which the recording is performed, and in a specific area in which data is linked to the file recorder A file reproducing section for recording file information including a disc area recorder having position information in a disc in a file information management area in a disc, and recording the previous link information PL and the next link information NL in the file information. An optical disc recording and reproducing apparatus. The method of claim 14, And recording position information of a previous and next file recorder and position information of a higher file recorder as link information in the file recorder. The method of claim 14, And recording and reproducing the disc area recorder as link information, wherein the disc area recorder has position information of a previous disc area recorder and a next disc area recorder.