JPH11213576A - Recording and recording device having disk being able to rerecord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent writing data in a region being bad state for writing data. SOLUTION: A control section 10 measures the number of errors included in a reproduced signal in demodulation of a reproduced signal at the time of reproduction of an optical disk 1, judges whether the number of errors exceeds the prescribed numbers previously set or not, when it exceeds the prescribed number, it is discriminated as a region in which a writing state is deteriorated and the region is set to prohibiting writing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable disk recording / reproducing apparatus such as a CD-RW drive for recording and reproducing data on and from a data rewritable optical disk such as a CD-RW.

[0002]

2. Description of the Related Art In a compact disk (CD), data is formed in small holes called pits on a recording surface, and the contents of the data are represented by the presence or absence and length of the pits. In a rewritable disk (CD-RW), a substance whose crystalline state changes by heat is used for a recording layer, and the recording layer is irradiated with laser light to form pits, and various data are recorded by the pits. Can be.

Further, the crystal state changed for recording data can be returned to the original state by applying heat again by laser light.
Data recorded on the RW can be erased or rewritten. In such a CD-RW, the number of times data is overwritten on the disc is limited to about 1000 times. If overwritten 1000 times, the recorded data may not be reproduced due to deterioration of the recording layer. Will be higher.

[0004]

However, the CD-
In a CD-RW drive that records data on an RW, there is no means for storing the number of times data has been overwritten on a disk, and even if the recording layer deteriorates as the number of overwrites increases, data write quality cannot be guaranteed. There was a problem.

[0005] The present invention has been made in view of the above points, and it is an object of the present invention to prevent data from being written into a poorly written area.

[0006]

In order to achieve the above object, the present invention provides means for recording data by irradiating a rewritable disk with a light beam from an optical head, and a method for recording data on the rewritable disk. In a rewritable disc recording / reproducing apparatus equipped with means for demodulating a reproduction signal by a light receiving signal and reproducing data, the number of errors included in the reproduction signal is measured when demodulating the reproduction signal, and the number of errors is set in advance. A means is provided for judging whether or not the number exceeds a predetermined number, and when the number exceeds the predetermined number, judging that the area is in a deteriorated writing state and setting the area to be write-protected.

Further, there are provided means for recording data by irradiating a light beam from an optical head to a rewritable disc, and means for reproducing data by demodulating a reproduction signal based on a light receiving signal of the light beam irradiated from the optical head. In the rewritable disk recording / playback apparatus provided, when a host computer requests playback of a designated area, the number of errors included in the playback signal is measured during demodulation of the playback signal of the designated area, and the number of errors is measured. Means for judging whether or not the number exceeds a predetermined number set in advance, and when the number exceeds the predetermined number, judging that the writing state of the designated area is degraded, and setting the designated area to write-protection; When the host computer instructs writing to the designated area that is set to write-protected by the means, the write operation is not performed. To Stone computer may be provided with means for error reporting.

Further, there are provided means for recording data by irradiating a light beam from an optical head onto a rewritable disc, and means for reproducing data by demodulating a reproduction signal based on a light receiving signal of the light beam irradiated from the optical head. In the rewritable disk recording / reproducing apparatus provided, when a write request is made from the host computer to the designated area, the number of errors contained in the reproduced signal is measured when demodulating the reproduced signal in the designated area, and the number of errors is determined in advance. It is determined whether or not the number exceeds a predetermined number. If the number exceeds the predetermined number, it is determined that the writing state of the specified area is degraded, and an error is sent to the host computer without writing to the specified area. A means for reporting may be provided. Furthermore, it is more preferable to provide a means for setting the predetermined number of thresholds.

According to a first aspect of the present invention, there is provided a rewritable disk recording / reproducing apparatus for irradiating a rewritable disk with a light beam from an optical head to record data, and using a light receiving signal of the light beam emitted from the optical head. While demodulating the reproduction signal to reproduce data, measuring the number of errors included in the reproduction signal at the time of demodulating the reproduction signal, determining whether the number of errors exceeds a predetermined number, and determining the predetermined number. If it exceeds the limit, it is determined that the write state is deteriorating and the area is set to write-protected, so that writing to an area with a bad write state that may not be able to be reproduced even if data is overwritten is prevented. be able to.

According to a second aspect of the present invention, there is provided a rewritable disk recording / reproducing apparatus for irradiating a rewritable disk with a light beam from an optical head to record data, and receiving the light beam emitted from the optical head. While reproducing the data by demodulating the reproduction signal by the signal, when the host computer requests reproduction of the specified area, the number of errors included in the reproduction signal is measured at the time of demodulation of the reproduction signal of the specified area. It is determined whether or not the number of errors exceeds a predetermined number set in advance.If the number of errors exceeds the predetermined number, it is determined that the writing state of the specified area is degraded, and the specified area is set to write-protected. When the host computer instructs to write to the write-protected designated area, the host computer does not perform the write operation. An error report is sent to the data source, so that it is possible to automatically set a write-protected area by checking whether the area is in a deteriorated write state during data reproduction, and to write data to an area other than the write-protected area when writing data. You can make it.

According to a third aspect of the present invention, there is provided a rewritable disk recording / reproducing apparatus for irradiating a rewritable disk with a light beam from an optical head to record data, and receiving the light beam emitted from the optical head. The data is reproduced by demodulating the reproduction signal by the signal, and when a write request is made from the host computer to the designated area, the number of errors contained in the reproduction signal is measured when the reproduction signal of the designated area is demodulated, and the error is measured. It is determined whether the number exceeds a predetermined number set in advance, and when the number exceeds the predetermined number, it is determined that the writing state of the specified area is deteriorating, and the host is not written to the specified area. Since the error is reported to the computer, it is possible to prevent data from being recorded in an area which is likely to be unable to be reproduced after writing.

Furthermore, in the rewritable disk recording / reproducing apparatus according to the fourth aspect of the present invention, since the predetermined number of thresholds is set, the criterion for the deterioration of the writing state can be made variable, and the user can use the criterion. Appropriate criteria can be set according to the situation.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a CD as an embodiment of a rewritable disk recording / reproducing apparatus according to the present invention.
FIG. 3 is a block diagram illustrating a configuration of an RW drive.

This CD-RW drive has a CPU, RO
A spindle motor (hereinafter referred to as "motor") 2 for rotating an optical disc 1 capable of re-recording (rewritable) data such as a CD-RW, which is realized by a microcomputer including M, RAM, etc., and a semiconductor laser mounted thereon. An optical pickup 4 for irradiating the recording area of the optical disc 1 with a laser beam L, and a coarse motor 3 for moving the optical pickup 4 in the radial direction of the optical disc 1 in cooperation with a seek motor provided therein. I have.

A rotation control system 5 for controlling the rotation of the motor 2, a coarse motor control system 6 for controlling the drive of the coarse motor 3, an optical pickup control system 8 for controlling the optical pickup 4, The EFM signal from the light receiving signal from the pickup 4 is demodulated, and the C
A CIRC decoder / encoder 7 for detecting a 1,1 C2 error and demodulating a signal of data to be written in a recording area of the optical disc 1, and a CD-RO for correcting data from the CIRC decoder / encoder 7 based on the C1 and C2 errors.
An M decoder / encoder 9, and the control systems 5, 6, and 8,
And a control unit 10 for controlling the decoders / encoders 7 and 9 and performing control processing according to the present invention.

The CIRC decoder / encoder 7 detects C1 and C2 errors using a known technique (for example, see Japanese Patent Application Laid-Open No. H8-7497).

Further, the control unit 10 is connected to the host computer 12 via the external interface 11, sends data read from the optical disk 1 to the host computer 12, and receives data to be written on the optical disk 1 from the host computer 12. Also do.

Then, the optical disk 1 is rotated by the motor 2, the coarse movement motor 3 is rotated by the control of the coarse movement motor control system 6 to move the optical pickup 4 in the radial direction of the optical disk 1, and the optical pickup control system 8 The laser light L from the semiconductor laser of the optical pickup 4 is
The data is recorded and reproduced by irradiating the recording area on the recording surface of the.

At the time of data reproduction, an EFM signal based on a light receiving signal from the optical disk 1 is demodulated by a CIRC decoder / encoder 7, and the demodulated data is transmitted to a CD-RO.
The data is corrected by the M decoder / encoder 9 and the corrected reproduction data is sent to the host computer 12 via the external interface 11.

At the time of data recording, the data received from the host computer 12 is demodulated by the CD-ROM decoder / encoder 9, the demodulated data is further demodulated by the CIRC decoder / encoder 7, and the laser light is emitted at a predetermined recording power value. Emits light and EF appears on the optical disc 1.
Record the M signal.

That is, the control unit 10 and the like
Means for recording data by irradiating a light beam from an optical head to a rewritable disc; means for reproducing data by demodulating a reproduction signal based on a light receiving signal of the light beam irradiated from the optical head; At the time of demodulation, the number of errors included in the reproduced signal is measured, and it is determined whether or not the number of errors exceeds a predetermined number.If the number of errors exceeds the predetermined number, it is determined that the writing state has deteriorated. The function of means for setting the area to be write-protected.

When the host computer issues a request for reproducing the designated area, the number of errors contained in the reproduced signal is measured at the time of demodulation of the reproduced signal of the designated area, and the number of errors is set to a predetermined number. Means for determining whether or not the specified area is degraded, and determining that the writing state of the specified area is deteriorating if the number is more than a predetermined number; When a write instruction is given from the host computer to the designated area, the function of reporting an error to the host computer without performing the write operation is also performed.

Further, when the host computer issues a write request to a designated area, the number of errors contained in the reproduced signal is measured when demodulating the reproduced signal in the designated area, and the number of errors exceeds a predetermined number. The function of means for determining whether the write condition of the specified area is deteriorating when the number exceeds a predetermined number and notifying the host computer of an error without writing to the specified area. Fulfill. Furthermore, it also functions as a means for setting the predetermined number of thresholds.

FIG. 2 is a flowchart showing a data recording state determination process in the CD-RW drive.
When a request for data recording state determination is made, the control unit 10 starts data recording state determination in step (indicated by “S” in the figure) 1 and proceeds to step 2 to reproduce a specified area to be determined. Proceeding to step 3, the number of C1 and C2 errors obtained by demodulating the designated area is measured, and proceeding to step 4 to judge the write state based on whether the number of errors exceeds a predetermined number. .

If it is determined in step 4 that the number of errors does not exceed the predetermined number, it is determined that the write state is still at a level that can withstand recording, and the process proceeds to step 5 to determine a writable area. The process proceeds to step S6, and the data recording state determination processing ends.

On the other hand, if the number of errors exceeds the predetermined number determined in step 4, it is determined that the write state has deteriorated and is not at a level that can withstand recording.
Then, the process proceeds to step 6 to set the designated area as a write-protected area, and proceeds to step 6 to end the data recording state determination processing.

In this way, when the number of C1 and C2 errors obtained by the CIRC decoding at the time of reproduction exceeds a predetermined number, it is determined that the writing state is deteriorated, and the overwriting of data in the area is prohibited. Therefore, it is possible to reliably prevent writing into an area where reproduction is impossible due to deterioration of the recording layer of the CD-RW.

FIG. 3 is a flowchart showing a process when a data reproduction request is made from the host computer in the CD-RW drive. When there is a request for data reproduction from the host computer in step (indicated by “S” in the figure) 11, the control unit 10 proceeds to step 12 to reproduce the designated area to be reproduced, and proceeds to step 13 to specify the designated area. The number of C1 and C2 errors obtained in the demodulation of the area is measured, and the flow advances to step S14 to determine the write state based on whether or not the number of errors exceeds a predetermined number.

If the number of errors does not exceed the predetermined number determined in step 14, it is determined that the write state is still at a level that can withstand recording, and the process proceeds to step 15 where it is determined that the area is a writable area, and reproduction is performed. The data is transmitted to the host computer, and the reproduction processing ends.

On the other hand, if the number of errors exceeds the predetermined number determined in step 14, it is determined that the write state has deteriorated and is not at a level that can withstand recording, and the flow advances to step 16 to write the designated area. The data is set in the prohibited area and stored, and the process proceeds to step 15 where the reproduction data is transmitted to the host computer, and the reproduction processing ends.

Thereafter, when there is a data recording request from the host computer in step 21, the process proceeds to step 22, where it is determined whether or not the designated area of the recording location is an area stored as the write-protected area. If not, the flow advances to step 23 to write (record) data in the designated area, and the flow advances to step 24 to end the recording process.

On the other hand, if it is determined in step 22 that the designated area of the recording location is the area stored as the write-inhibited area, the flow advances to step 25 to report an error to the host computer without performing the write operation. Proceeding to 24, the recording process ends.

As described above, when a reproduction request is issued from the host computer to the CD-RW disc, the number of C1 and C2 errors resulting from the processing performed by the CIRC decoder when reproducing the designated area exceeds a predetermined number. The write state of the recording area is determined to be degraded, the recording area is stored as a write-protected area, and there is no write request from the host computer to the recording area set in the write-protected area. In this case, an error is immediately reported without performing writing, so that writing to an area that may not be reproduced can be prevented.

FIG. 4 is a flowchart showing a process when a data recording request is made from the host computer in the CD-RW drive. When there is a data recording request from the host computer in step (indicated by “S” in the figure) 31, the control unit 10 proceeds to step 32 to reproduce the designated area to be recorded, and proceeds to step 33 to reproduce the designated area. The number of C1 and C2 errors obtained by demodulation is measured, and the routine proceeds to step 34, where the writing state is determined based on whether or not the number of errors exceeds a predetermined number.

If the number of errors does not exceed the predetermined number determined in step 34, it is determined that the write state is still at a level that can withstand recording, and the flow advances to step 35 to determine that the area is a writable area. The data received from the computer is recorded, and the recording process ends.

On the other hand, if the number of errors exceeds the predetermined number determined in step 34, it is determined that the write state has deteriorated and is not at a level that can withstand recording, and the designated area is determined as a write-inhibited area. Then, the process goes to step 37 to report an error to the host computer without writing to the designated area, and goes to step 36 to end the recording process.

As described above, when a recording request is issued from the host computer to the CD-RW disc, the designated area is reproduced, and the number of C1 and C2 errors as a result of processing by the CIRC decoder at the time of reproduction is obtained. When the number exceeds a predetermined number, it is determined that the write state of the recording area is degraded, and the recording area is set as a write-inhibited area,
Since an error is immediately reported without writing data from the host computer, writing to an area that may not be reproduced can be prevented.

By the way, in the above processing, C1, C
If the threshold value of the predetermined value to be compared with the two error numbers is fixed, the subsequent writing becomes impossible in an area slightly exceeding this threshold value. However, this threshold value is not uniformly determined from the beginning according to the conditions such as the use environment of the drive. If the threshold value is always fixed, writing cannot be performed even if overwriting is possible, and the recording area of the CD-RW is made effective. Can no longer be used. Further, when the number of overwrites is small but the recording area is at a level at which reproduction is impossible due to severe deterioration of the recording area, it may be determined that overwriting is possible.

Therefore, by making it possible to arbitrarily change a predetermined number of thresholds used when judging the writing state based on the number of C1 and C2 errors obtained as a result of the reproduction decoding, for example, if the threshold is raised, the write It is possible to relax the judgment criteria of the state, to reduce the writing to another area, and to save the consumption of the recording area. Further, when the threshold value is lowered, the writing operation can be prohibited even with a small number of errors, and writing to another area is increased, so that data can be more reliably stored.

FIG. 5 is a flowchart showing a process for setting a predetermined number of thresholds in the CD-RW drive. When there is a recording state determination threshold setting request from the host computer in step 41, the control unit 10 proceeds to step 42, changes the requested threshold to a predetermined number at the time of the write state determination, sets the threshold, and proceeds to step 43. Ends the recording state determination threshold setting process.

As described above, the threshold value of the predetermined value for judging the writing state based on the number of C1 and C2 errors obtained as a result of the processing by the CIRC decoding at the time of reproduction is arbitrarily set, so that the judgment criterion of the writing state can be changed This makes it possible to set an optimal judgment criterion according to the use condition of the drive.

[0042]

As described above, according to the rewritable disk recording / reproducing apparatus according to the present invention, it is possible to prevent data from being written into an area having a bad writing state.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a CD-RW drive as one embodiment of a rewritable disk recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart showing a data recording state determination process in the CD-RW drive.

FIG. 3 is a flowchart showing processing when a data reproduction request is issued from a host computer in the CD-RW drive.

FIG. 4 is a flowchart showing processing when a data write request is made from a host computer in the CD-RW drive.

FIG. 5 is a flowchart showing a process for setting a predetermined number of thresholds in the CD-RW drive.

[Explanation of symbols]

 1: optical disk 2: motor 3: coarse motor 4: optical pickup 5: rotation control system 6: coarse motor control system 7: CIRC decoder / encoder 8: optical pickup control system 9: CD-ROM decoder / encoder 10: control Part 11: External interface 12: Host computer

Claims (4)

[Claims] 1. A means for recording data by irradiating a light beam from an optical head to a rewritable disk, and a means for reproducing data by demodulating a reproduction signal based on a light receiving signal of the light beam irradiated from the optical head. In the rewritable disk recording / reproducing apparatus provided with, the number of errors included in the reproduced signal is measured at the time of demodulation of the reproduced signal, and it is determined whether or not the number of errors exceeds a predetermined number. A rewritable disk recording / reproducing apparatus, characterized in that a means for judging an area in which the writing state has deteriorated when the value exceeds the threshold value and setting the area to write-protection is provided. Means for recording data by irradiating a light beam from an optical head onto a rewritable disc; means for reproducing data by demodulating a reproduction signal based on a light receiving signal of the light beam irradiated from the optical head; In a rewritable disk recording / reproducing apparatus having a function, when a host computer requests reproduction of a designated area, the number of errors contained in the reproduced signal is measured at the time of demodulation of the reproduction signal of the designated area, and the number of errors is measured. It is determined whether or not exceeds a predetermined number set in advance, and when the number exceeds the predetermined number, it is determined that the writing state of the specified area is deteriorated, and the specified area is set to be write-protected, When the host computer issues a write instruction to the designated area that is set to write-protected by the means, the host computer performs the write operation without performing the write operation. Rewritable disk recording and reproducing apparatus characterized in that a means for performing an error report to emissions computer. 3. A means for irradiating a rewritable disk with a light beam from an optical head to record data, and a means for demodulating a reproduction signal based on a light receiving signal of the light beam radiated from the optical head to reproduce data. In a rewritable disk recording / reproducing apparatus having a function, when a write request is made from a host computer to a designated area, the number of errors contained in the reproduced signal is measured when demodulating the reproduced signal in the designated area, and the number of errors is measured. It is determined whether or not the number exceeds a predetermined number. If the number exceeds the predetermined number, it is determined that the writing state of the designated area is degraded. A rewritable disk recording / reproducing apparatus characterized by comprising means for reporting an error. 4. The rewritable disk recording / reproducing apparatus according to claim 1, further comprising: means for setting the predetermined number of thresholds. apparatus.