JP3680008B2 - Optical disc data reading device, optical disc data copying device, and optical disc data reading speed control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disk data reading device that reads data from an optical disk when copying data between a plurality of optical disks. The present invention also relates to an optical disk data copying apparatus capable of copying data between a plurality of optical disks. Furthermore, the present invention relates to an optical disk data reading speed control method applied to such an optical disk data copying apparatus.
[0002]
[Prior art]
Optical discs include a read-only CD-ROM and DVD-ROM, a recordable CD-R, a rewritable CD-RW, and the like. Using these optical disks, data can be copied between a plurality of optical disks. One method of copying data between multiple optical disks is to read the data from the copy source optical disk with a read optical disk drive, write the read data to the hard disk, and then write the data written to the hard disk for writing. There is a method of writing on a copy destination optical disk by an optical disk drive. Alternatively, two optical disk drives for reading and an optical disk drive for writing are connected to the host computer, the data is read from the copy source optical disk by the optical disk drive for reading, and the read data is directly written via the host computer. There is a method of sending to an optical disk drive for writing and writing to a copy destination optical disk by the optical disk drive for writing.
[0003]
[Problems to be solved by the invention]
In the latter method, when data is written to the copy destination optical disk, the read data transfer rate of the read optical disk drive needs to be equal to or higher than the write data transfer rate of the write optical disk drive. If the read data transfer rate is slower than the write data transfer rate, write data disappears as data is written. As a result, continuous recording is interrupted, resulting in a write error. Such an error is called a buffer under error.
[0004]
The optical disk drive for reading reads data at a higher transfer rate than the optical disk drive for writing. For this reason, the optical disk drive for reading rotates the optical disk at high speed. If there is no problem with the quality of the optical disc, data can be read correctly even at high speed. However, there are some poor optical disks, and when such a bad optical disk is rotated at high speed, data may not be read correctly. If the data cannot be read correctly, the read operation is retried. At the time of retrying the reading operation accompanied by the servo recovery, more time is spent than at the time of normal data reading. As a result, the above buffer underrun error may be caused.
[0005]
An object of the present invention is made in view of the above circumstances, and an optical disc data reading device, an optical disc data copying device, and an optical disc capable of preventing the occurrence of a buffer underrun error during optical disc data copying The object is to provide a data reading speed control method.
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, an optical disc data copying apparatus and an optical disc data reading speed control method according to the present invention are configured as follows.
[0007]
(1) The present invention is an optical disk data reading device for reading data from an optical disk when copying data between a plurality of optical disks, a reading means for reading data from the optical disk, and an optical disk data writing device side at the time of data copying Detecting means for detecting the writing speed, and reading speed control means for controlling the reading speed of the reading means at the time of data copying according to the writing speed detection result.
[0008]
(2) The present invention is an optical disk data copying apparatus for copying data between a plurality of optical disks, wherein the optical disk data copying apparatus includes reading means for reading data from the optical disk, and writing means for writing data to the optical disk. The data is read from the first optical disk by the reading means, and the read data is written to the second optical disk by the writing means, whereby the data on the first optical disk is written to the second optical disk. Data copy control means for copying the data, and the reading means detects the writing speed of the writing means at the time of data copying by the data copy control means, and the data copy at the time of data copying by the data copy control means. Reading of reading means Speed, and a reading speed control means for controlling the writing speed detection result of the detecting means.
[0009]
(3) In the optical disk data read speed control method of the present invention, the data on the first optical disk is read by reading the data from the first optical disk and writing the read data on the second optical disk. A first step of detecting a writing speed at the time of data copying to be copied to the second optical disc, and a second step of controlling a reading speed at the time of data copying according to the writing speed detected by the first step. And steps.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a diagram showing an outline of an optical disc apparatus according to an example of an optical disc data copy apparatus of the present invention. As shown in FIG. 1, the optical disc apparatus includes a host PC 1, an HDD 2, a read optical disc drive 3, and a write optical disc drive 4. The host PC 1 connects the HDD 2 to the primary master, the read optical disk drive 3 to the secondary master, and the write optical disk drive 4 to the secondary slave via the IDE (ATA) bus.
[0012]
When copying optical disk data, the data is read from the copy source optical disk by the read optical disk drive 3, the read data is temporarily written in the HDD 2, and the data written in the HDD 2 is copied by the write optical disk drive 4. Write to. Alternatively, data is read from the copy source optical disk by the read optical disk drive 3, and the read data is directly sent to the write optical disk drive 4 via the host PC 1, and written to the copy destination optical disk by the write optical disk drive 4. Hereinafter, the case where optical disk data is copied by the latter method will be mainly described.
[0013]
FIG. 2 is a diagram showing details of each block of the optical disc apparatus shown in FIG. The host PC 1 includes a CPU 11 and a buffer 12. The CPU 11 issues a read command to the read optical disk drive 3 or issues a write command to the write optical disk drive 4 to write the data of the optical disk loaded in the read optical disk drive 3. Copy to the optical disk loaded in the optical disk drive 4.
[0014]
The read optical disk drive 3 includes a disk motor 31, an optical head 32, a drive control circuit 33, a signal processing circuit 34, a MUP 35, a buffer 36, and an I / F circuit 37. The MPU 35 receives various commands from the CPU 11 of the host PC 1 via the IF circuit 37 and controls the operation of the reading optical disk drive 3 based on the received commands. For example, when a read command is received, optical disk data is read as follows.
[0015]
First, the disk motor 31 rotates the optical disk based on the drive control of the drive control circuit 33. The optical head 32 irradiates the optical disk with a reproduction light beam, receives the reflected light of the light beam, converts it into an electrical signal, and outputs it. Based on the drive control of the drive control circuit 33, the optical head 32 moves in the optical axis direction of the light beam applied to the optical disc and in the radial direction of the optical disc. The signal processing circuit 34 receives the electrical signal output from the optical head 32, and performs demodulation processing and error correction processing. The signal demodulated by the signal processing circuit 34, that is, the reproduction signal is output from the reading optical disk drive 3 to the outside via the IF circuit 37. When data is copied via the HDD 2, the reproduction signal is written to the HDD 2 via the IF circuit 37 and the buffer 12. At the time of data copying not via the HDD 2, this reproduction signal is output to the writing optical disk drive 4 via the IF circuit 37. The signal processing circuit 34 detects a focus error and a tracking error based on the electrical signal output from the optical head 32, and supplies a drive signal to the drive control circuit 33 so as to correct the focus error and the tracking error. .
[0016]
The optical disk drive 4 for writing includes a disk motor 41, an optical head 42, a drive control circuit 43, a signal processing circuit 44, a MUP 45, a buffer 46, and an I / F circuit 47. The MPU 45 receives various commands from the CPU 11 of the host PC 1 via the IF circuit 47, and controls the operation of the optical disk drive 4 for writing based on the received commands. For example, when a write command is received, optical disk data is written as follows.
[0017]
First, the disk motor 41 rotates the optical disk based on the drive control of the drive control circuit 43. Optical disc data to be written is input to the signal processing circuit 44 via the IF circuit 47. The signal processing circuit 44 encodes optical disk data. The drive (on / off) of the recording light beam emitted from the optical head 42 is controlled based on the encoded optical disk data. Thereby, the optical disk data is reflected in the recording light beam emitted from the optical head 42, and as a result, the optical disk data is recorded on the optical disk. The optical head 42 irradiates a data recording destination on the optical disk with a reproducing light beam, receives the reflected light of the light beam, converts it into an electrical signal, and outputs it. The signal processing circuit 44 receives the electrical signal output from the optical head 42 and performs demodulation processing and error correction processing. Thereby, it is confirmed whether the recorded optical disk data is correctly recorded. Based on the drive control of the drive control circuit 43, the optical head 42 moves in the optical axis direction of the light beam applied to the optical disc and in the radial direction of the optical disc. The signal processing circuit 44 detects a focus error and a tracking error based on the electrical signal output from the optical head 42, and supplies a drive signal to the drive control circuit 43 so as to correct the focus error and the tracking error.
[0018]
Next, with reference to a flowchart shown in FIG. 3, the optical disk data read speed control in the read optical disk drive according to the first embodiment of the present invention will be described.
[0019]
When copying optical disk data between a plurality of optical disks, the CPU 11 of the host PC reads data from the copy source optical disk, temporarily stores the data in the buffer 12, and writes the data to the copy destination optical disk.
[0020]
First, the CPU 11 of the host PC selects the read optical disk drive 3 and issues a read command on the bus (ST101). In the flowchart, the selection of the read optical disk drive 3 is detected (ST102, YES), and the issue of the read command is also detected (ST103, YES). Accordingly, the MPU 35 of the read optical disk drive 3 controls each part of the drive to read data from the optical disk. That is, on the flowchart, the optical disc data is not yet being copied (ST104, NO), and corresponds to normal reading. At this time, the rotational speed of the disk is set to the highest speed of the optical disk drive 3 for reading (ST105), and the seek operation and data acquisition are repeated (ST106). As a result, data is read at the highest speed and transferred at the highest speed (ST107).
[0021]
Subsequently, the CPU 11 of the host PC selects the optical disk drive 4 for writing and issues a write command on the bus (ST101). In the flowchart, selection of the optical disk drive 4 for writing is detected (ST102, NO), and issue of a write command is also detected (ST109, YES). Accordingly, the MPU 45 of the writing optical disk drive 4 controls each part of the drive to write data to the optical disk. At this time, the write data transfer rate is measured by the MPU 35 via the I / F circuit 37 on the read optical disk drive 3 side (ST110). That is, the writing speed is measured. Based on this measurement result, the MPU 35 determines the rotational speed of the disk on the read optical disk drive 3 side (ST111).
[0022]
Next, when the reading optical disk drive 3 is selected (ST102, YES) and a read command is issued (ST103, YES), the MPU 35 recognizes that the optical disk data is being copied. Therefore, in the flowchart, the optical disk is being copied (ST104, YES), controlled to the determined rotation speed (ST112), and seek operation and data acquisition are repeated (ST106). As a result, data is read at a speed corresponding to the determined rotational speed, and the data is transferred (ST107). For example, the reading speed is controlled to be slower than the highest speed of the reading optical disk drive 3 and higher than the writing speed of the writing optical disk drive 4. Alternatively, the reading speed is controlled to the same speed as the writing speed of the writing optical disk drive 4.
[0023]
As described above, in the reading optical disk drive 3, it is detected whether or not the optical disk data is being copied. If copying is in progress, the minimum necessary data reading transfer rate is determined based on the data writing transfer rate. Data is read. The minimum necessary data read transfer rate is a transfer rate that is low enough not to cause a buffer underrun error. In this way, the transfer rate is controlled to a low speed, and as a result, the disk rotation speed is also controlled to a low speed, and data can be read without retry even from a bad disk that cannot be read at high speed rotation. Can do. That is, the occurrence of a buffer underrun error is suppressed, and the optical disc data can be stably copied.
[0024]
Next, optical disk data reading speed control according to the second example of the present invention will be described with reference to the flowchart shown in FIG.
[0025]
When copying optical disk data between a plurality of optical disks, the CPU 11 of the host PC reads data from the copy source optical disk, temporarily stores the data in the buffer 12, and writes the data to the copy destination optical disk.
[0026]
First, the CPU 11 of the host PC selects the read optical disk drive 3 and issues a read command on the bus (ST201). In the flowchart, selection of the read optical disk drive 3 is detected (ST202, YES), and issue of a read command is also detected (ST203, YES). Accordingly, the MPU 35 of the read optical disk drive 3 controls each part of the drive to read data from the optical disk. That is, in the flowchart, the optical disk data is not yet being copied (ST204, NO), and corresponds to normal reading. At this time, the rotational speed of the disk is set to the highest speed of the optical disk drive 3 for reading (ST205), and the seek operation and data acquisition are repeated (ST206). As a result, data is read at the highest speed and transferred at the highest speed (ST207).
[0027]
Subsequently, the CPU 11 of the host PC selects the optical disk drive 4 for writing and issues a write command on the bus (ST201). In the flowchart, selection of the optical disk drive 4 for writing is detected (ST202, NO), and issue of a write command is also detected (ST209, YES). At this time, issuance of a write-related command is detected by the MPU 35 of the reading optical disk drive 3, and a flag indicating that optical disk data is being copied is set in the memory of the MPU 35 (ST210). The write-related commands include not only a write command but also a command group such as a read buffer capacity (Read Buffer Capacity) issued when performing an optical disk write process.
[0028]
Next, when the read optical disk drive 3 is selected (ST202, YES) and a read command is issued (ST203, YES), the MPU 35 of the read optical disk drive recognizes that the optical disk data is being copied. Therefore, in the flowchart, the optical disk is being copied (ST204, YES), and at this time, the reading speed is controlled to a predetermined speed (ST212). For example, the reading speed is controlled to a predetermined speed that is slower than the highest speed of the reading optical disk drive 3 and higher than the writing speed of the writing optical disk drive 4.
[0029]
As described above, in the reading optical disk drive, whether or not the optical disk data is being copied is detected (monitoring a command issued on the same bus). Data is read at the data read transfer rate. The predetermined data reading transfer rate is a low reading transfer rate within a range in which a buffer underrun error does not occur. For example, the transfer rate is equal to or slightly faster than the maximum writing speed of the optical disk drive for writing. At this time, as a precondition, the reading fastest transfer rate of the reading optical disk drive is faster than the writing fastest transfer rate of the writing optical disk drive. As a result, the disk rotation speed is controlled to be lower than when reading a normal optical disk, and data can be read without retry even from a bad disk that cannot be read at high speed rotation. That is, the occurrence of a buffer underrun error is suppressed, and the optical disc data can be stably copied. Further, in this example, it is not necessary to detect the writing speed, and it can be realized simply by detecting whether or not copying is in progress.
[0030]
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.
[0031]
【The invention's effect】
According to the present invention, it is possible to provide an optical disc data reading device, an optical disc data copying device, and an optical disc data reading speed control method capable of preventing the occurrence of a buffer underrun error during optical disc data copying.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of an optical disc apparatus according to an example of an optical disc data copy apparatus of the present invention.
FIG. 2 is a diagram showing details of each block of the optical disc apparatus shown in FIG. 1;
FIG. 3 is a flowchart for explaining optical disk data read speed control in the read optical disk drive according to the first example of the present invention;
FIG. 4 is a flowchart for explaining optical disk data read speed control in a read optical disk drive according to a second example of the present invention;
[Explanation of symbols]
1 ... Host PC
2 HDD
3 ... Optical disk drive for reading 4 ... Optical disk drive for writing 11 ... CPU
12 ... Buffer 31 ... Disc motor 32 ... Optical head 33 ... Drive control circuit 34 ... Signal processing circuit 35 ... MUP
36 ... Buffer 37 ... I / F circuit 41 ... Disk motor 42 ... Optical head 43 ... Drive control circuit 44 ... Signal processing circuit 45 ... MUP
46 ... Buffer 47 ... I / F circuit

Claims (3)

An optical disc data reading device for reading data from the first optical disc when data is copied between the first and second optical discs using a data writing device,
Reading means capable of reading data from the first optical disc at a reading speed faster than a maximum writing speed for writing data to the second optical disc by the data writing device;
Based on the presence or absence of a data write command for the data write device, if it is determined that the write operation by the data write device is not yet started, the read is performed at the maximum read speed of the read means with respect to the data read command. If the data read operation from the first optical disc is controlled by the means and it is found that the data write operation is being performed by the data write device, the maximum write speed of the data write device for the same data read command is determined. A reading speed control means for controlling reading of data from the first optical disc by the reading means at a reading speed equivalent to the speed and slower than the maximum reading speed of the reading means;
An optical disk data reading device comprising: An optical disk data copy device for copying data between a first and a second optical disk,
The optical disc data copying apparatus
A read device for reading data from the first optical disc in accordance with a data read command;
A writing device for writing data to the second optical disc in accordance with a data writing command;
Issue data read command to read the data from the first optical disk by the reading device, be written into the second optical disk by the writing device the read data by issuing a data write command A data copy control means for copying the data of the first optical disk to the second optical disk;
With
The reading device includes:
Reading means capable of reading data from the first optical disc at a reading speed faster than a maximum writing speed for writing data to the second optical disc by the data writing device;
Based on the presence or absence of a data write command for the data write device, if it is determined that the write operation by the data write device is not yet started, the read is performed at the maximum read speed of the read means with respect to the data read command. If the data writing operation is controlled by the data writing device and the data writing device is in a data writing operation, the data writing device can write the highest A reading speed control means for controlling the reading of data from the first optical disk by the reading means at a reading speed equivalent to the speed and slower than the maximum reading speed of the reading means;
An optical disk data copying apparatus comprising: An optical disk data reading speed control method for controlling a reading speed for reading data from the first optical disk when copying data between the first and second optical disks,
If it is determined that the data writing operation is not started by the data writing device based on the presence or absence of the data writing command to the data writing device, the second optical disc is used by the data writing device in response to the data reading command. Reading data from the first optical disk by the reading means at the highest reading speed of reading means capable of reading data from the first optical disk at a reading speed faster than the maximum writing speed for writing data to Control
Based on the presence or absence of a data write command to the data write device, if it is found that the data write operation is being performed by the data write device, the maximum write speed of the data write device is Controlling reading of data from the first optical disc by the reading means at a reading speed that is equivalent and slower than the maximum reading speed of the reading means;
An optical disk data reading speed control method characterized by the above.

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