JP4010445B2 - Information recording / reproducing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information recording / reproducing apparatus for an optical disc that records and reproduces information by irradiating a recording surface of a recordable optical disc such as a CD-R with a light beam. This is a technique applicable to all optical disc systems such as -R and DVD-RW.
[0002]
[Prior art]
A drive device capable of recording data on an optical disc such as a CD-R disc or a CD-RW disc generally has a plurality of recording speeds. This is because when the data transfer from the host is not in time with the increase in recording speed, a buffer underrun error occurs, or the error is avoided by reducing the recording speed, or the disk This is because the recording is performed at a reduced speed when it is difficult to record at high speed due to poor mechanical characteristics.
[0003]
When the drive device records data for the first time on the disk at the recording speed set by the host, laser power calibration called OPC is performed in order to set an appropriate recording laser power. The optimum recording laser power determined here is stored as OPC information in a non-volatile memory in the drive device. When data is recorded on the disk at the same recording speed as before, the stored OPC information is stored. It is common to record using.
[0004]
In addition, as a recording method, a CLV (Constant Linear Velocity) method having a feature that the amount of recorded information increases is used, and recording is performed at a linear velocity that is a fixed multiple of the reference velocity for high-speed recording. The method to do is common. However, since the disk rotation speed in the inner circumference is large in CLV recording, if the recording speed is further increased in CLV recording, the rotation speed cannot be increased due to the limitation of the rotation control system in the disk inner circumference. It becomes a problem. For this reason, a CAV (Constant Angular Velocity) system in which the disk rotation speed is constant has also been attempted.
[0005]
As a reproduction method in the CD system, not only the CLV method but also a CAV method having a feature of high data transfer speed is generally used. However, when recording by the CAV method, a recording laser power necessary for recording is increased on the outer periphery. It becomes difficult to control because it becomes larger as it goes to the part, and the generation of the recording pulse becomes complicated because the recording signal frequency continuously changes inside the disk, so it is not so common. .
[0006]
In order to solve these problems, a ZCLV (Zone CLV) method has been proposed in which the recording speed can be increased CAV-like based on the recording method of the CLV method used so far.
[0007]
In this ZCLV system, a disk is divided into a plurality of zones, and recording is performed with a CLV recording speed set for each zone. Normally, the recording speed is increased each time recording is performed in the outer peripheral zone. At the zone joints, data continuity is maintained using the technique described in JP-A-10-49990. In zone switching, a method in which a defined track and session are set as one zone, a method in which one packet is set as one zone, and the like have been proposed.
[0008]
In this ZCLV method, OPC is executed at a recording speed that can be recorded in the inner circumferential zone, and the determined OPC information is stored in a nonvolatile memory in the drive device. The recording laser power for the outer peripheral zone is determined by calculating from the determined OPC information.
[0009]
The host can request the drive device to notify the OPC information by using a command (interface command such as ATAPI or SCSI). Similarly, OPC information can be set by a command.
[0010]
However, in the above ZCLV method, the recording speed set by the host may not correspond to the recording laser power determined by actually executing the OPC.
[0011]
[Problems to be solved by the invention]
For example, the ATIP information recorded on the disc is read to determine the corresponding recording speed, recording is performed in the test area with the optimum recording power for each recording speed, and the optimum recording speed is extracted from the recording characteristics and stored. There is a device that stores information in the means and when the user sets the recording speed, the optimum recording speed information is read, and a recording operation can be performed at the optimum speed (see Japanese Patent Laid-Open No. 2000-163751).
[0012]
However, when recording is performed by the ZCLV method, the recording speed set by the host may not correspond to the recording laser power determined by actually executing the OPC. Further, the host could not know correct OPC information.
[0013]
An object of the present invention is to provide an information recording / reproducing apparatus capable of notifying a host of correct OPC information.
[0014]
[Means for Solving the Problems]
In the present invention, recording corresponding to a plurality of recording speeds is possible, and in a drive apparatus in which the recording speed is increased by using the ZCLV method, the actual recording laser power is stored in a nonvolatile memory in the drive apparatus. When saving, the recording speed set by the host is also stored in the nonvolatile memory. As a result, correct OPC information and the recording speed at that time can be returned to the host.
[0015]
In the present invention, when the OPC information reaches the upper limit of the nonvolatile memory, the old OPC information is deleted in order. Thereby, the OPC information for the new disk can be stored in the nonvolatile memory in the drive device.
[0016]
In the present invention, when the OPC information is stored in the nonvolatile memory in the drive device, the OPC information table is rearranged from the top to the newest. As a result, since there is a high possibility that recording will be performed again on a recently used disc, the search for OPC information on the recently used disc is accelerated by this processing, and the processing time can be shortened.
[0017]
In the present invention, when the OPC information is stored in the non-volatile memory in the drive device, the OPC information is stored in the non-volatile memory in the drive device only when the recording is completed as additional recording is possible. Thereby, since the OPC information is not saved unnecessarily, the memory can be used efficiently.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
The present invention will be described by taking a CD-R drive as an example. FIG. 1 shows a configuration (CD-R drive) of the present invention. The drive device includes a motor 2 that rotates an information recording medium (CD-R disc) 1 at an arbitrary rotation speed, and a rotation control unit 3 that controls the motor 2. Furthermore, a pickup 4 for irradiating the optical laser to the CD-R disk 1, a laser drive circuit 9 for driving the optical laser of the pickup 4, an actuator control unit 5 for controlling the pickup 4 to move in the radial direction, A signal control unit 6 that controls a signal from the pickup 4 is provided.
[0019]
It comprises an external interface 10 for exchanging signals with the host computer 11 and a drive controller 7 for controlling the entire drive device, such as a buffer 8 which is a temporary storage location for data and the like. A non-volatile memory 12 is also connected to record information unique to the drive device. The nonvolatile memory 12 stores an OPC information management table to be described later, and also stores a program for operating the drive controller 7 and the like.
Next, a method for storing OPC information will be described. The user sets data to be recorded using writer software. At this time, the recording speed and the like are also set, and recording is started when all the settings are completed. When receiving the recording start command, the drive device executes the OPC process.
[0020]
The optimum recording laser power determined by the OPC process is stored as OPC information for the disc in the OPC information management table shown in FIG. 2 together with the set recording speed and the recording speed at which the actual OPC is executed. The OPC information is stored for each disk ID. The management numbers are numbered from 1 in order from the old OPC information.
[0021]
Therefore, when the host uses a command such as ATAPI to request the drive apparatus to notify the OPC information, the drive apparatus is set as described above with reference to the OPC information management table in the nonvolatile memory 12. The recording speed, the recording speed when the OPC process is actually executed, and the optimum recording laser power can be notified to the host, and the host can know the correct OPC information.
[0022]
Since the capacity of the non-volatile memory 12 in the drive device is finite, if recording is performed on a plurality of disks, the upper limit of the capacity of the non-volatile memory 12 is reached, and the OPC information cannot be stored thereafter. End up.
[0023]
Therefore, when the OPC information reaches the upper limit of the nonvolatile memory, the old OPC information is deleted in order. This will be described with reference to FIG. When the OPC information has reached the upper limit of the memory as shown in FIG. 3A, when newly adding OPC information, the oldest OPC information (management is referred to by referring to the management number as shown in FIG. 3B. (The number with the smallest number) is searched and deleted, and new OPC information is saved and a management number is assigned again as shown in FIG.
[0024]
If the OPC information table managed in the non-volatile memory is stored as shown in FIG. 3, the search process takes time.
[0025]
Therefore, when the OPC information is stored in the nonvolatile memory in the drive device, the OPC information table is rearranged in order from the top. Referring to FIG. 4, when the OPC information is stored as shown in (a) and new OPC information is added, the stored OPC information is shifted as shown in FIG. Save the OPC information. As a result, as shown in (c), since the new OPC information is arranged in order, the search can be performed quickly. In the state of (c), when adding new OPC information, the OPC information is shifted downward (the OPC information of the management number 1 is deleted), an empty space is created at the top, and the new OPC information is stored there. to add.
[0026]
As described above, since there is a high possibility that recording will be performed again on a recently used disc, the search of OPC information on the recently used disc is accelerated by this processing, and the processing time can be shortened.
[0027]
FIG. 5 is an operation flowchart of OPC information storage executed by the drive controller. The operation will be described with reference to FIG. When starting recording, it is determined whether or not recording has been performed previously by referring to the OPC information table in the nonvolatile memory 12 using the ID of the disk as a key (step A1). (Yes in step A1), the recording laser power corresponding to the disk ID is determined from the OPC information stored in the nonvolatile memory 12 in the drive device (step A2), and recording is started (step A4).
[0028]
When recording on the disc for the first time (No in Step A1), OPC is executed to determine the optimum recording laser power (Step A3), and recording is started (Step A4). When the recording is completed (Yes in step A5) and the disc has been recorded before, it is determined that the OPC information is stored in the nonvolatile memory in the drive device (Yes in step A6), and the state is unchanged. The recording process ends. If it is the first recording on the disc (No in step A6), even if the disc is other than a CD-R disc or a CD-R disc, data is additionally recorded on the disc. Is set to be possible (No in step A7), the OPC information is stored in the nonvolatile memory 12 in the drive device (step A8), and the recording process is terminated.
[0029]
When the recording is terminated with no additional writing possible on a CD-R disc in which data cannot be rewritten, no further recording can be performed on the disc. Therefore, it is useless to save the OPC information in the nonvolatile memory in the drive device. Therefore, as described above, when the OPC information is stored in the non-volatile memory in the drive device, the OPC information is stored in the non-volatile memory in the drive device only when recording is completed because additional recording is possible. Thereby, since the OPC information is not saved unnecessarily, the memory can be used efficiently.
[0030]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
(1) The correct OPC information and the recording speed at that time can be returned to the host.
(2) OPC information for a new disk can be stored in a non-volatile memory in the drive device.
(3) Since there is a high possibility that recording will be performed again on a recently used disc, the search for OPC information on a recently used disc is accelerated by arranging the new OPC information in order, and the processing time can be shortened.
(4) Since the OPC information is not saved unnecessarily, the memory can be used efficiently.
[Brief description of the drawings]
FIG. 1 shows a configuration (CD-R drive) of the present invention.
FIG. 2 shows an OPC information management table of the present invention.
FIGS. 3A to 3C are diagrams illustrating a method for managing OPC information.
FIGS. 4A to 4C are diagrams illustrating another management method of OPC information.
FIG. 5 is an operation flowchart for storing OPC information.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical disk 2 Motor 3 Rotation control part 4 Pickup 5 Actuator control part 6 Signal control part 7 Drive controller 8 Buffer memory 9 Laser drive circuit 10 External interface 11 Host computer 12 Non-volatile memory

Claims (3)

The data area of the information recording medium is divided into a plurality of zones, an OPC process is performed at a recording speed that can be recorded in an inner circumferential zone of the plurality of zones, and recording is performed by switching the recording speed for each of the plurality of zones. an information recording and reproducing apparatus using a zone CLV recording method, executed after the recording process ends requested by the host, in response to the information recording medium, a recording speed set by the host, the actual OPC process An information recording / reproducing apparatus comprising storage means for storing OPC information including a recording speed and a recording laser power.   2. The information recording / reproducing apparatus according to claim 1, wherein when storing the OPC information of a plurality of information recording media in the storage means, the OPC information is stored in order from the new OPC information.   2. The information recording / reproducing apparatus according to claim 1, wherein the OPC information is stored only when recording is completed in a state where additional recording is possible.

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