JP2005310282A - Method and device for managing disk medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for shortening the reading time of data divided and recorded in a disk. <P>SOLUTION: The position and the size of divided and recorded data in a disk are managed for reading target data to judge whether even the divided and recorded data are physically continuous or not in the entire reading target data. Thus, by continuously reading data when the data are arranged to be physically continuous, the occurrence of unnecessary seeking is suppressed to read disk information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk medium management method for a disk reproducing apparatus for reproducing data and an apparatus having the same.

  When data is recorded on the disc, management information for managing where the recorded data is recorded on the disc is required. For this reason, JIS X 0605-1990 widely used in MS-DOS and Windows (registered trademark), OSTA (Optical Storage Technology Association) used in FAT system and DVD, etc. are widely used to provide management methods. UDF, etc. are mentioned, and it is called a logical standard for disks. By using these logical standards, it is possible to determine where the data corresponding to the file is recorded on the disc by the file name. In addition, since the directory concept is defined, it is possible to express a hierarchical structure.

  FIG. 5 is a schematic diagram showing the relationship between management information in MS-DOS and data on the disc. In the FAT system, which is a file management method used in MS-DOS, etc., there is a management descriptor called a directory entry for each directory, and this descriptor stores 32 bytes of information for each file and directory existing in the directory. In this 32 bytes, the file name, file name extension, file attribute, last edit time, last edit date, start cluster, and file size are recorded.

  When the data file is managed, the start cluster number and the file size in which the data is actually recorded are recorded. Information on how the data is actually recorded on the disc is obtained by referring to the FAT. FAT is, for example, 16-bit information for every cluster on the disk, the cluster number to be accessed next is recorded in this 16-bit information, and the last cluster for forming a series of files. Is recorded with information (0xFFFF) indicating that it is the last. In other words, the start descriptor cluster number of the data recorded on the disk can be known from the management descriptor, and when reading data from the disk, the cluster number to be read next is managed by FAT and repeated until 0xFFFF appears. That's good.

On the other hand, FIG. 6 is a schematic diagram showing management information in UDF. Only the part for managing where the file is recorded on the disc will be described. In the UDF, the position information in which the data is recorded is recorded in the file entry (File Entry). The position information is performed in units of continuous recording. When the position information is divided and recorded on the disc, management is performed for each division.
JP 2001-43662 A

  As shown in FIG. 7, the data information recorded on the disk medium needs to be continuously arranged on the disk even if it is a single unit of data A indicating the data structure of the program, image, or disk. However, it is possible to divide and record data A-1, data A-2, data A-3, etc. at various positions on the disc. The logical standard FAT and UDF standards manage the position and size of data divided on the disk, but do not manage how the division information is arranged on the disk.

  Therefore, as shown in FIG. 8, the entire information of the data B is continuously recorded on the disc, but when the configuration data is divided, it is read in the order of division recording defined in the logical standard. First, data B-1 is read, then data B-2, and data B-3 are read. Therefore, there is a problem that a seek occurs when reading each data, and the reading time is delayed.

  Therefore, by managing the position and size of each piece of recorded data on the disc for the entire data information, the divided data is recorded. However, when considering the entire data information, the information is physically recorded continuously. And reading such data without causing unnecessary seeks. This aims to shorten the time required for unnecessary seeking and improve the data reading speed.

  In order to achieve the above object, the disk information management method of the present invention is a disk medium management method for managing data recorded in a divided manner on a disk medium. When reading one data file, the logical arrangement and physical By managing the arrangement in advance, continuous reading is performed on the data that is recorded in a divided manner.

  The present invention manages the reading position and reading size on the disc of each piece of recorded data for the entire data information, so that it is physically continuous even for logically discontinuous data. Make a decision. If it is determined that the data is physically continuous, the data is continuously read. As a result, generation of unnecessary seek can be suppressed, and the reading speed of data recorded on the disk can be improved.

  According to the first aspect of the present invention, in a disk medium management method for managing data recorded on a disk medium, when a single data file is read, the logical arrangement and physical arrangement of the data file are determined in advance. By managing, continuous reading is performed on the data recorded in a divided manner.

  According to a second aspect of the present invention, in the disk medium management method, the divided and recorded data is read physically continuously, and the data logically discontinuously stored on the memory is handled logically continuously. is there.

(Embodiment 1)
FIG. 1 is a block diagram of a data reproducing apparatus having a disk medium management method according to the present invention.

  In the figure, reference numeral 1 denotes an optical disk as a recording medium. In the present embodiment, the optical disk is an optical disk, but any optical disk that can be randomly accessed, such as a hard disk or a semiconductor memory, may be used. Reference numeral 2 denotes a pickup for reading data from the optical disc 1. A device 3 converts a signal read by the pickup 2 into data, and stores the converted data in a memory indicated by 4. Reference numeral 5 denotes a system controller that analyzes data stored in the memory 4, forms management information described later, grasps the physical state of data recorded on the disk medium, and instructs the control unit 6 to start reading the disk medium. And present the reading size.

  A control unit 6 is a control device for moving the pickup 2 to the reading start position of the disk medium designated by the system controller 5 and transmitting the designated reading size from the pickup.

  Reference numeral 7 denotes a decoder / DAC circuit having audio / video demodulating / converting means, which converts the digital signal into an analog signal after decoding the audio data and the video data by the decoder circuit.

  Reference numeral 8 denotes a video terminal, which outputs a video signal converted into an analog signal by the decoding / DAC circuit 7, and 9 is an audio terminal which is a means for outputting an audio signal.

  In the data reproducing apparatus configured as described above, a method for reading desired data from a disk medium without causing unnecessary seek is proposed. Hereinafter, a method of creating disk medium management information using the system controller 5 and determining a reading position and a size designated for the control unit 6 using the management information will be described.

  In the present invention, before the entire data information is read, the position and size of the data on the disc recorded and divided by the management table shown in FIG. 2 are managed for all the positions and sizes of the management information. FIG. 2 shows a management table 21 for managing the division recording position and size. When the data information 22 is divided into a plurality of pieces and recorded as shown in A-1 to A-3, each piece of recorded information is managed. Information of one piece of data is managed by four items of “data start position”, “data end position”, “record size”, and “actual data arrangement order”.

  As the position information, the start position and the end position of the divided data are recorded. The start position of this segmentation record stores the position information value of the segmented data described in each logical standard, and the end position stores the value obtained by adding the size of the segmented data to the start position. To do. In addition, the divided data size is recorded. Since the size of the divided recording can be calculated from the start position and the end position of the data, it is not always necessary to record it. However, in the present invention, the size is also stored as management information in order to briefly explain the subsequent processing. The actual data array order is a field for managing the physical permutation of the divided and recorded data, and the method for storing and using the value will be described later.

  FIG. 3 shows a processing flow for determining whether the divided and recorded information is the data continuously recorded on the disc when the divided information is considered in the whole data information 22 using the management information table 21 shown in FIG. Show. In S1 of FIG. 3, the management information having the smallest start position is searched from the table managed in FIG. This process can be easily obtained by comparing the start positions of the pieces of segmentation information recorded in the management information. Next, in S2, the actual data array order indicating the order in which the divided data is arranged on the disk medium is initialized, and the values are stored in the actual data array order related to the minimum start position in FIG. This value is information used in a data read process described later. It is the order in which the entire data information is recorded, and represents the positional relationship of the data recorded on the disk medium.

  In S3, it is determined whether each piece of recorded data is continuously recorded on the disk medium in the entire data information. The end recording position of the management information having the minimum start position obtained in S1 is compared with the recording start position of the management table shown in FIG. 2, and it is checked whether there is an equal value between the end position and the start position. Here, when the end position and the start position are equal, it means that the division information of both is recorded in a divided manner, but is physically recorded continuously. In step S4, the actual data recording order is stored in the actual data array order related to the start position of the management information shown in FIG. The value to be stored is a value obtained by adding 1 to the previous actual data recording order value. The number of pieces recorded in S5 is compared with the number that has been physically confirmed up to now. When the number of confirmed continuity is equal to the number of divided recordings, the entire data information is recorded physically continuously, and unnecessary seek occurs by performing the continuous reading process of S6. Will be able to read. On the other hand, when the number of confirmed continuous parts does not reach the number of divided recordings, the process returns to the process of S3 and the processes of S3 to S5 are repeated.

  In S3, if the end position of the divided data does not match the start position of the divided data managed in FIG. 2, the entire data information is physically recorded discontinuously. In that case, in S7, the divided reading with the conventional seek is performed.

  In S6, since the divided and recorded data is known to be physically continuous, the data is read from the recording start position associated with the information having the smallest actual data arrangement order in FIG. The data reading size is the sum of the recording sizes managed in FIG.

  By this processing, it is possible to continuously read data while suppressing unnecessary seek with respect to the entire data recorded discontinuously in the management information of the FAT or UDF standard as shown in FIG.

  Data read from a disk is generally stored on a temporary storage (memory).

  However, the data read into the memory while suppressing unnecessary seeks is stored in a form different from the data permutation managed by the FAT or UDF standard. That is, the data information is logically stored non-continuously. Therefore, when data on the memory is handled, the data on the memory is read using the actual data arrangement permutation and recording size managed in FIG. As a result, it is possible to read data stored in a logically discontinuous manner as in the case of logically continuously storing data. Next, the method is provided. FIG. 4 shows a flow relating to processing for continuously reading data in a memory that is discontinuously expanded.

  First, in S8, a variable for determining a reading position of data expanded on the memory is initialized. In order to obtain the position where necessary data is stored from among the data expanded on the memory, the variable for determining the reading position on the memory in S9 and the actual data array sequence value managed in FIG. Search for equal fragmented data.

  Then, in the process of S10, the sum of the recording sizes of the divided data stored higher than the management information detected in the process of S9 is obtained. In S11, data is read from a position obtained by adding the sum of the data sizes stored before the target data obtained in the processing of S10 to the head position of the memory where the disk data is expanded. The read size is the recording size managed by the management information in FIG. As a result, it is possible to use the data developed on an arbitrary memory for the divided recording size. Therefore, it is possible to use the data discontinuously expanded on the memory without being aware of the discontinuity point. If the variable representing the reading position is smaller than the divided number in S12, the reading position is advanced in S13, and the process returns to S9.

  The above processing is repeated until the variable indicating the reading position becomes equal to or greater than the number of divided data. As a result, the data that is discontinuously expanded from the disk to the memory is changed in order of management information accompanied by seeking by only changing the reference position of the memory without performing a moving process such as copying. It can be handled in the same way as when reading.

  By using this process, an extra process for calculating the reference position on the memory occurs as compared with the conventional process, but it is possible to suppress the seek process that occurs when data is read from the disk. The processing time added by this processing is very short compared to the time required for unnecessary seeking, so that the time required for reading data from the disk can be shortened.

  Since the disk medium management method and apparatus according to the present invention can improve the reading speed of the divided and recorded data, it is useful in the technical field of reading a disk medium that can be divided and recorded.

The block diagram which shows the structure of the disk medium management apparatus in embodiment of this invention Schematic diagram showing the data structure in the same embodiment A flowchart showing a reading operation in the embodiment A flowchart showing a reading operation in the embodiment Schematic diagram for explaining the data reading operation in the conventional configuration Schematic diagram for explaining the data reading operation in the conventional configuration Schematic diagram for explaining problems in the prior art Schematic diagram for explaining problems in the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Pickup 3 Reading part 4 Memory 5 System controller 6 Control part 7 Decoding / DAC circuit 8 Video terminal 9 Audio | voice terminal

Claims (3)

In the disk medium management method for managing the data recorded on the disk medium, when one data file is read, the logical arrangement and physical arrangement of the data file are managed in advance. A disk medium management method characterized by performing continuous reading. In a disk medium management method, a disk medium management method characterized by physically reading continuously recorded data and handling data logically discontinuously stored in a memory logically continuously. A disk medium management apparatus using the disk medium management method according to claim 1.

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