JPS613236A - Optical disk device - Google Patents

Abstract

PURPOSE:To shorten a data access time by providing a buffer memory part which has a control table in which a seek frequency, etc., are entered to the optical disk device and a jumpable area on a recording medium surface. CONSTITUTION:The area 11 where a laser beam skips is provided on the surface of a disk 1; and control data are written in tracks 2-4 of its center part and information data are written in other tracks. The buffer memory part 31, on the other hand, is provided between an optical disk controller 32 and a disk adapter 33 which constitute the optical disk device; information data from a computer 4 are read in a memory part 31 and transferred to an optical disk drive 30, and the control table where the seek frequency, a recording and a reproducing address, etc., are entered is generated. Then, recording and reproduced data with high seek frequencies are recorded preferentially in the area 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical disc device that reduces data access time.

(8) Industrial application field An optical disk device is a device that optically records information and reproduces information recorded on the tracks by irradiating a laser beam onto a track provided on the surface of a recording medium. It is characterized by having a large storage capacity compared to magnetic disk devices that record and reproduce information. 2. Description of the Related Art In recent years, the amount of information processed by computers has increased, and in order to record and reproduce this increased information, the use of optical disk devices with a large recording capacity is attracting attention.

BACKGROUND ART FIG. 2 is a side cross-sectional view and a block diagram of an optical head of an optical disk device. That is, as shown in the block diagram of FIG. 2, the objective lens 22 that constitutes a part of the optical head is
A laser beam incident through a laser beam path is focused and irradiated onto a predetermined location on a track provided on the surface of a recording medium (hereinafter referred to as a disk) 1 to record information, and the laser beam is reflected from the track surface. capture and reproduce the information. Also,
A lens drive actuator 21 changes the polarization angle of the objective lens 22 and drives the laser beam to jump between predetermined tracks.

(e) Problems to be Solved by the Invention The optical head of this optical disk device, as shown in the block diagram of FIG. The optical system is larger and heavier than a magnetic disk, so the seek speed to a predetermined position on a track is about one-tenth slower than that of a magnetic disk device.

Furthermore, since the recording/reproducing track width of an optical disk is less than 1 μm, which is approximately 1/30th that of a magnetic disk, accurate track positioning cannot be achieved only by seeking using the head carriage that seeks the entire head, and after seeking using the head carriage, the lens is driven. The laser beam must be moved by the actuator 21 to access a predetermined track.

Therefore, extra time is required for track access.

For the reasons mentioned above, the average access time of an optical disk device is more than 10 times longer than the average access time of a magnetic disk, and there is a problem that it is difficult to keep up with the speed of recording and reproducing information with a computer.

fdl Means for Solving the Problems The present invention provides an optical disc device that solves the above problems and can shorten data access time. In an optical disk device that optically records and reproduces information by moving the optical disk, the optical disk device includes a buffer memory section having a management table in which seek frequencies, seek time intervals, and recording/playback addresses are recorded; An optical disc is provided with an area on the medium surface that can be recorded and reproduced by jumping laser light (a jumpable area), and is configured so that recording/reproduction data with a high seek frequency is given priority and recorded in the jumpable area. made by the device.

In other words, the data first sought from the disk surface by the command of the host computer is first read in the buffer memory section and transferred to the computer, and at the same time, an area ( From the next time onwards, the data will be sent directly from within the jumpable area to the computer. In other words, data can be reproduced by accessing the jumpable area at high speed only by the jump of the laser beam, without performing seek by the head carriage, and information can be reproduced at high speed with the computer.

On the other hand, when writing data from a host computer to a disk medium, the same data is written to a predetermined address in the disk medium and at the same time to an area where the laser beam can jump. When reproducing it, the data in the jumpable area is reproduced.

In addition, a management table is created in which the data address, seek frequency, and seek time interval of data to be recorded/reproduced in the buffer memory section are recorded, and the table is recorded in the track within the laser beam jump area 11. When the recording capacity in the area that can be moved is running low, erase data that is rarely used and write new data.
Priority is given to recording data that is sought frequently.

ffl Example Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 1 is a plan view of a disk for explaining the area in which a laser beam can jump in an embodiment according to the present invention, and FIG. 3 is a plan view for explaining the operation of a buffer memory section in an embodiment according to the present invention. FIG.

That is, as shown in FIG. 1, a region 11 is provided on the surface of a disc-shaped disk 10 in which a laser beam can be transferred by an optical system. The area 11 in which the laser beam can jump has approximately 300 tracks on an 8-inch diameter optical disk, which has a considerable recording capacity of 7.5 megabytes (corresponding to 1% of the capacity on one side of the disk). Management data is written in tracks 2 to 4 in the central part 12 of the area 11 where the laser beam can jump, and information data is written in the other tracks, and data is recorded and reproduced by the jump of the laser beam. is facilitated. In addition, by providing the area 11 where the laser beam can jump around the center of the data zone on the first surface of the disk, the time required for the laser beam to jump from any position in the data zone to the area 1 where the laser beam can jump can be shortened. ing.

The buffer memory section 31 is provided between an optical disk controller 32 and a disk adapter 33, which constitute an optical disk device, as shown in the block diagram of FIG. Information data from the computer 4 is input to the buffer memory section 31 via the optical disk controller I/roller 32. The buffer memory section 31 reads the input information data and transfers it to the optical disk drive 30, and also creates a management table in which the address of the input data, seek frequency, seek time interval, etc. are described. This management data and information data are transferred to tracks other than the above-mentioned laser beam jump area 11 of the disk 1 and the laser beam via a disk adapter 33 that controls seek, information modulation/demodulation, laser beam track access, etc. The information is recorded on a track within the light scattering area 11. When reproducing the data of the information recorded in this manner, the data is directly sent to the computer 4 from within the laser beam jumpable area 11 from the next time onwards.

Also, when the remaining capacity in the area 11 where the laser beam can jump is low, referring to the management table created in the buffer memory unit 31, data is sequentially erased starting from the least frequently sought data, and new data is written. , data that is frequently used is recorded preferentially, and the tracks within the area 11 where the laser light can jump are used effectively.

Further, after completing a predetermined task, the management table in the sofa memory 31 is always written in the center of the area where the laser beam can jump, thereby ensuring the reliability of the device.

As described above, the management table created by the buffer memory unit 31 gives priority to frequently used data and records it in the laser beam transferable area 11, and the laser beam transfer is performed by the lens drive actuator 21 of the optical head. Recording and reproduction of -k can be performed at high speed by accessing only by the user.

(gl. Effects of the Invention) As is clear from the explanation in Section 2, according to the present invention, data that is used more frequently than the management table created by the buffer memory section is given priority and recorded within the area where the laser beam can jump. By doing so, it is possible to obtain an optical disc device that can record and reproduce frequently used data while shortening the data access time.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a round disk illustrating a region in which laser light can jump according to an embodiment of the present invention, FIG. 2 is a side cross-sectional view and block diagram of an optical disk device, and FIG. 3 is a plan view of a round disk according to an embodiment of the present invention. FIG. 3 is a block diagram for explaining the operation of a buffer memory section of one embodiment. In the figure, ■ is a recording medium (disk), 11 is an area where the laser beam can jump, 12 is the center of the area where the laser beam can jump, 21 is a lens drive actuator, 22 is an objective lens, 30 is an optical disk drive, 31 is a buffer memory section, 32 is an optical disk controller, 33 is a disk adapter, and 4 is a computer. Figure 1 Figure 2 Figure 113 = 228

Claims (1)

[Claims] In an optical disk device that optically records and reproduces information by moving a laser beam to a track provided on a recording medium surface, seek frequency, seek time interval, and recording/playback address are written on the optical disk device. A buffer memory section having a management table and an area where recording and reproduction can be performed by jumping laser beams on the surface of the recording medium (skipping possible area) are provided, and priority is given to recording/reproducing data with high seek frequency. An optical disc device characterized in that it is configured to record in the jumpable area.