JP2003036596A - Optical disk device and recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device and a recording method that can prevent from the buffer underrun occurrence under recording operation. SOLUTION: This optical disk device comprises an optical pickup for performing information recording and reproduction to an optical disk, a memory which is a region for storing information temporarily for recording and reproduction, a host I/F control section for communicating with a host PC, and a CPU which controls the whole. In the device, the CPU comprises a real transmission rate calculation means 7 to calculate the real transmission rate of the recording data from the host PC when the buffer underrun occurs in the test write at a recording speed designated by the host PC, an optimum recording speed calculation means 8 to calculate the optimum recording speed based on the calculated real transmission rate, and an optimum recording speed offering means 9 to provide the host PC with the calculated optimum recording speed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD-R and a CD-R.
The present invention relates to an optical disc device for performing recording on an RW disc and a recording method in the optical disc device.

[0002]

2. Description of the Related Art In recent years, optical disk devices have played an important role as a basic product of multimedia, especially CDs.
-ROM drive devices have become indispensable as peripheral devices for personal computers. In recent years, CD-R / RW drive devices having a data recording function for CD-R media and CD-RW media have been developed under intense competition among companies.

FIG. 1 is a block diagram showing a general optical disk device (optical disk drive device). In FIG. 1, 101 is an optical disc, 102 is an optical pickup for recording / reproducing with respect to the optical disc 101, 103 is a CPU (central processing unit) for controlling the whole, 104 is a memory, 1
Reference numeral 05 is a host interface control unit (host I / F control unit) for communicating with the host PC 109, 106 is an encoder for converting data from the host PC 109 into a format for recording on the optical disc 101, and 107 is information from the optical disc 101. Decoder for converting the data into a format to be returned to the host PC 109, 108 is the optical pickup 1
02 is a DSP (digital signal processor) for position control and signal processing.

FIG. 1 shows a conventional recording operation for a CD-R medium in the optical disc device having such a configuration.
5, and FIG. 16 will be described. FIG. 15 shows W for recording request
FIG. 16 is a data diagram showing an example of a RITE command, and FIG. 16 is a data diagram showing an example of a FLUSH CACHE command which is a recording end instruction command.

First, the host PC 109 issues a recording request command to the optical disk device. The optical disc apparatus uses the host I / F control unit 105 to control the host P
The command issued from C109 is the WRI for recording request
Recognizing that it was a TE command (see FIG. 15), the recording data is received from the host PC 108, and the memory 1
Store in 04. In addition, an optical disc (here, CD-
The optical pickup 102 is made to stand by at the recording start position requested by the host PC 109 by using the DSP 108 so that the recording operation to the (R medium) 101 can be started.

The optical disc apparatus stores the recording data in the memory 104 by executing the WRITE command a plurality of times, and the recording data is stored to some extent in the memory 104.
From the time when the data is stored in the CD-R medium 101, the encoder 106 is operated to generate data to be recorded in the CD-R medium 101.
The recording power is applied to and the data recording is started. During the data encoding process, the host PC 109
Controls the input speed so that the recording data does not become a buffer full state in the memory 104.

Finally, all the recorded data is stored in the host PC 109.
From the host PC to the optical disk device
109 is a recording end instruction command, FLUSH C
The ACHE command (see FIG. 16) is issued. Upon receiving the FLUSH CACHE command issued from the host PC 109, the optical disk device performs encoding until all the recording data in the memory 104 is recorded in the CD-R medium 101, and when there is no recorded data in the memory 104. The encoding operation ends and the recording operation ends. The above is the flow of one recording operation.

FIG. 11 is a block diagram showing the processing on the CPU 103 which constitutes the conventional optical disk device. Figure 1
In FIG. 1, 201 is a communication means for communicating with the host PC 109, 202 is a command request analysis means for analyzing the request content of the command from the host PC 109, 20
3 is a data exchange means for exchanging data with the host PC 109, 204 is a recording speed setting means for setting a recording speed designated by the host PC 109, 2
Reference numeral 05 is a disk rotating means for rotating the optical disk 101 at the specified recording speed, and 206 is a recording means for performing an encoding operation to perform recording on the optical disk 101.

With respect to the processing on the CPU 103 configured as described above, its schematic operation will be described with reference to FIGS. 13 and 14. FIG. 13 is a timing chart showing the case where the buffer underrun does not occur, and FIG. 14 is a timing chart showing the case where the buffer underrun occurs.

In the actual recording operation in the optical disk device, the command request analyzing means 202 and the data exchanging means 203 in the communication means 201 are used to input the recording data into the memory 104, which is designated in advance by the host PC 109. By using the recording speed setting means 204 for setting the recording speed and the disk rotating means 205, the CD-
When the R medium 101 is rotated at a designated recording speed and a predetermined amount of recording data is stored in the memory 104, an encoding operation is performed using the recording unit 206.

In the flow of the above recording operation, FLUSH
During the encoding process before receiving the CACHE command, the input speed of the recording data from the host PC 109 to the memory 104 is from the memory 104 to the CD-
When the recording speed of the data for the R medium 101 is higher than the recording data amount in the memory 104, as shown in FIG. 13, the recording is normally completed without the buffer underrun, but the host PC 109
When the input speed of the recording data from the host PC 109 to the memory 104 is lower than the recording speed of the data from the memory 104 to the CD-R medium 101 due to the low processing capacity of the memory 104, as shown in FIG. There was a phenomenon that a buffer underrun occurred during recording.

FIG. 12 is a flow chart showing in detail the operation of the CPU 103 of FIG. In FIG. 12, first, the communication unit 201 receives print data from the host PC 109 (S61). The recording unit 206 stores the recording data in the memory 104 until a predetermined amount of recording data is accumulated in the recording buffer, that is, the memory 104 (S62). When the recording unit 206 determines that the recording data is accumulated in the predetermined amount, the encoding is started at the recording speed designated by the host PC 109 (S63).

During encoding, the communication means 201 determines the presence / absence of recording data in the memory 104 (S65) until the FLUSH CACHE command from the host PC 109 arrives (S64).
If it is not (empty), data reception from the host PC 109 and continuation of encoding are executed (S66), and step S
If it is determined to be Empty in 65, the host PC with the interruption of the encoding process and the buffer underrun error
The notification to 109 is performed (S67, S68). Also,
Host PC 1 before the memory 104 enters the Empty state
When the FLUSHCACHE command is issued from 09, the normal recording is completed (S69).

[0014]

As described above, in the conventional optical disk device, the recording speed specified by the host PC 109 (specified recording speed) exceeds the actual transfer rate of the recording data between the host PC 109 and the optical disk device. In this case, there is a problem that a buffer underrun occurs during the recording operation and the recording operation is interrupted.

In this optical disk device, the specified recording speed is prevented from exceeding the actual recording data transfer rate,
It is required to prevent the occurrence of buffer underrun during the recording operation.

In order to meet this demand, the present invention provides an optical disk device which can prevent the specified recording speed from exceeding the actual recording data transfer rate and can prevent the occurrence of buffer underrun during the recording operation. The purpose is to provide.

[0017]

In order to solve the above-mentioned problems, an optical disc apparatus of the present invention is an optical pickup for recording information on an optical disc and reproducing information from the optical disc, and temporarily stores information for recording and reproduction. Is an optical disc device having a memory, which is an area for temporarily storing the data, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole.
Actual transfer to calculate the actual transfer rate of the recording data from the host PC at the time when the buffer underrun occurs where the recording data disappears in the memory during the test write at the recording speed for the specified optical disk from the host PC. It is provided with a configuration including a rate calculating means, an optimum recording speed calculating means for calculating an optimum recording speed based on the calculated actual transfer rate, and an optimum recording speed providing means for providing the calculated optimum recording speed to the host PC. .

As a result, it is possible to provide an optical disk device and a recording method which can prevent the designated recording speed from exceeding the actual recording data transfer rate and prevent the occurrence of a buffer underrun during the recording operation. it can.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disc apparatus according to claim 1 of the present invention is an optical pickup for recording information on and reproducing information from the optical disc, and temporarily storing information for recording and reproducing. An optical disk device having a memory, which is an area for storing data, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole, wherein the CPU is an optical disk designated by the host PC. The actual transfer rate calculating means for calculating the actual transfer rate of the recording data from the host PC at the time when the buffer underrun occurs in which the recording data disappears in the memory during the test write at the recording speed The optimum recording speed calculation means for calculating the optimum recording speed based on the actual transfer rate, and the calculated optimum recording speed. The in which was to have the optimum recording speed providing means for providing to the host PC.

With this configuration, during the actual recording operation, the host PC uses the provided optimum recording speed to set the specified recording speed (the recording speed for the optical disk specified by the host PC) so that the buffer underrun does not occur. Since the data can be transmitted to the optical disk device, it is possible to prevent the specified recording speed from exceeding the actual recording data transfer rate in the optical disk device and prevent the occurrence of buffer underrun during the recording operation. Have an effect.

According to a second aspect of the present invention, in the optical disc apparatus according to the first aspect, instead of the optimum recording speed providing means, the calculated optimum recording speed is reset as a recording speed for the optical disk. It is to have means.

With this configuration, the optical disk device does not need to provide the optimum recording speed to the host PC and receive the specified recording speed from the host PC, so that the recording speed for the optical disk can be set more quickly. It is possible to prevent the occurrence of buffer underrun during the recording operation.

An optical disk device according to a third aspect of the present invention comprises an optical pickup for recording information on and reproducing information from the optical disk, and an area for temporarily storing information for recording and reproduction. An optical disk device having a memory, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole, wherein the CPU stores the recording speed at the time of occurrence of a buffer underrun in the past. The recording speed storage means, the recording speed providing means for providing the stored recording speed to the host PC, and the recording speed clearing means for clearing the stored recording speed.

With this configuration, the host P can be operated before the actual recording operation.
Since C can set the recording speed in consideration of the recording speed information when the buffer underrun occurs, the specified recording speed can be set without receiving the optimum recording speed from the optical disk device,
The optical disk device has the effect of being able to quickly receive the specified recording speed and prevent the occurrence of buffer undown during the recording operation.

According to a fourth aspect of the present invention, there is provided a recording method in an optical disc apparatus, wherein an optical pickup is used for recording information on the optical disc and reproducing information from the optical disc, and information is temporarily stored for recording and reproduction. Is an area of a memory, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole, wherein the CPU has a recording speed for the optical disk designated by the host PC. The actual transfer rate calculation step for calculating the actual transfer rate of the recording data from the host PC at the time when the buffer underrun occurs in which the recording data is lost in the memory during the test write of Based on the optimum recording speed calculation step that calculates the optimum recording speed based on In which it was decided to have the optimum recording speed providing step of providing a speed host PC.

With this configuration, during the actual recording operation, the host PC uses the provided optimum recording speed to set the specified recording speed (the recording speed for the optical disk specified by the host PC) so that the buffer underrun does not occur. Since the data can be transmitted to the optical disk device, it is possible to prevent the specified recording speed from exceeding the actual recording data transfer rate in the optical disk device and prevent the occurrence of buffer underrun during the recording operation. Have an effect.

According to a fifth aspect of the present invention, there is provided a recording method for an optical disc apparatus according to the fourth aspect, wherein the calculated optimal recording speed is replaced as a recording speed for the optical disc in place of the optimum recording speed providing step. The recording speed resetting step to be set is provided.

With this configuration, the optical disk device does not need to provide the optimum recording speed to the host PC and receive the specified recording speed from the host PC, so that the recording speed for the optical disk can be set more quickly. It is possible to prevent the occurrence of buffer underrun during the recording operation.

According to a sixth aspect of the present invention, there is provided a recording method in an optical disc apparatus, wherein an optical pickup is used for recording information on the optical disc and reproducing information from the optical disc, and information is temporarily stored for recording and reproduction. Is an area of the memory, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole, wherein the CPU is a recording device when a buffer underrun occurs in the past. It has a recording speed storing step for storing the speed, a recording speed providing step for providing the stored recording speed to the host PC, and a recording speed clearing step for clearing the stored recording speed.

With this configuration, the host P can be operated before the actual recording operation.
Since C can set the recording speed in consideration of the recording speed information when the buffer underrun occurs, the specified recording speed can be set without receiving the optimum recording speed from the optical disk device,
The optical disk device has the effects of being able to quickly receive the specified recording speed and prevent the occurrence of buffer underrun during the recording operation.

FIG. 1 shows an embodiment of the present invention.
~ It demonstrates using FIG.

(Embodiment 1) The structure of the optical disk device according to Embodiment 1 of the present invention is the same as the structure of a general optical disk device shown in FIG. 1, and the description thereof will be omitted.
The difference between the first embodiment and the conventional example is that the CPU 103
This is the operation of the above processing. FIG. 2 is a functional block diagram showing the function realizing means in the CPU 103 of FIG. 1, and is for explaining the recording control method in the present embodiment.

In FIG. 2, 1 is a communication means for communicating with the host PC 109, 2 is a command request analysis means for analyzing the request contents of the command from the host PC 109, and 3 is data exchange with the host PC 109. Data exchange means 4 for performing the above, recording speed setting means 4 for setting the recording speed designated by the host PC 109, and 5
Is a disc rotating means for rotating the optical disc 101 at the designated recording speed, and 6 is a recording means for performing an encoding operation to perform recording on the optical disc 101.

In FIG. 2, during the test write at the rotation speed of the optical disc 101 designated by the host PC 109, the recording data is recorded in the memory 104 in the optical disc device.
At the time when the buffer underrun that disappears above occurs, the actual transfer rate calculation means 7 of the recording data between the host PC 109 and the optical disk device and the optimum recording speed calculation means 8 are used to detect the buffer underrun in the current recording environment. Calculate the recording speed that does not occur (optimum recording speed).

Regarding the calculated optimum recording speed, the optimum recording speed providing means 9 for the host PC 109 is used to detect the buffer underrun error and the host PC.
109 to provide. The host PC 109 sets the optimum recording speed provided at the same time as the buffer underrun error in the optical disk device as the recording speed, so that the recording operation can be performed without the buffer underrun during the subsequent actual recording operation.

Next, a specific method of calculating the optimum recording speed and the flow of processing will be described with reference to FIGS. FIG. 3 is a flowchart showing a specific method of calculating the optimum recording speed, FIG. 4 is a timing chart showing recording data in the recording buffer (recording buffer area in the memory 104), and FIG. 5 is recording double speed and recording. It is a data figure which shows correspondence with a transfer rate.

In FIG. 3, first, the communication means 1 receives and processes the print data from the host PC 109 (S).
1). The recording means 6 is a recording buffer, that is, the memory 104.
Until a predetermined amount of recording data is accumulated in the memory 104
The recording data is stored in (S2). When the recording unit 6 determines that the recording data is accumulated in a predetermined amount, the host PC
Encoding start time T at 109 specified recording speed
(Start) is held (see FIG. 4) (S3).

Next, the recording means 6 causes the host PC 109 to specify a recording speed (specified recording speed) V (write).
The encoding by e) is started (S4). Next, the communication means 1 designates the end of recording (FL) from the host PC 109.
It is determined whether or not a USH CACHE command is issued) (S5). When it is determined that the recording end is not designated, the recording unit 6 sets the recording buffer in the memory 104 to E.
It is determined whether it is mpty (empty) (S7), and when it is determined that it is not empty, the data from the host PC 109 is received and the encoding is continued (S8). Empty
If it is determined that the encoding process is terminated, the recording unit 6 interrupts the encoding process (S9) and ends the encoding end time T (end).
Is held (see FIG. 4) (S10). Next, the actual transfer rate calculation means 7 calculates the actual transfer rate V (in) of the recording data from the host PC 109 (S11, actual transfer rate calculation step).

A method of calculating the actual transfer rate V (in) will be described. When the input speed of the recording data to the memory 104 (the actual transfer speed of the recording data sent from the host PC 109 during the encoding process to the optical disk device) is lower than the output speed (the recording speed of the optical disk designated by the host PC 109), the process shown in FIG. The amount of recording data in the memory 104 decreases as time passes, as shown in the graph during the encoding process. Originally, the encoding is started in a state where a predetermined amount of data is accumulated in the memory 104. Therefore, if the recording data amount in the memory 104 at the start of encoding is WBUFSIZE, from the graph during the encoding process of FIG. 4, WBUFSIZE = ( V (write) −V (in)) × (T (end) −T (start)) ... (1) holds. From the above formula (1), V (in) can be expressed as V (in) = V (write) -WBUFSIZE / (T (end) -T (start)) ... (2).

Therefore, as shown in the flowchart of FIG. 3, the encoding start time T (start) of step S3 is held and the encoding end time T (end) of step S10 is held.
By holding the above, it is possible to calculate the actual transfer rate V (in) of the print data from the host PC 109 at the time when the buffer underrun occurs. That V (i
A recording speed that is not higher than the value of n) and is high is selected from the data diagram shown in FIG.

For example, if the specified recording speed from the current host PC is 8 times speed and the calculation result of V (in) is 5 times speed, it means that the recording speed is less than the value of V (in) and is high. , Optimum recording speed V (optimum write)
Is selected (S12, optimum recording speed calculation step). This selection is made by the optimum recording speed calculation means 8.

Thereafter, when notifying the host PC 109 of the buffer underrun error, the optimum recording speed providing means 9 calculates V (optimum wr) calculated (selected) this time.
(ite) is notified to the host PC 109 (step of providing optimum recording speed). Before the next actual recording operation, the host PC
109 is the V (optimum
By specifying write) as the recording speed, it is possible to realize the recording operation without the buffer underrun.

As described above, according to this embodiment, the CP
U103 calculates the actual transfer rate of the recording data from the host PC at the time when a buffer underrun occurs in which the recording data disappears in the memory during the test write at the recording speed for the optical disk designated by the host PC 109. The actual transfer rate calculating means 7, the optimum recording speed calculating means 8 for calculating the optimum recording speed based on the calculated actual transfer rate, and the optimum recording speed providing means 9 for providing the calculated optimum recording speed to the host PC. By having the host P at the time of actual recording operation
The C109 uses the provided optimum recording speed
Designated recording speed (optical disc 10 designated by the host PC 109 so that buffer underrun does not occur)
(Recording speed for 1) can be transmitted to the optical disk device, so that in the optical disk device, it is possible to prevent the specified recording speed from exceeding the actual recording data transfer rate, and to prevent the occurrence of buffer underrun during the recording operation. Can be prevented.

(Second Embodiment) The structure of an optical disk device according to a second embodiment of the present invention is the same as the structure shown in FIG. 1 showing a general optical disk device, and a description thereof will be omitted.
The second embodiment differs from the first embodiment in that the CPU
This is the operation of 103. FIG. 6 is a functional block diagram showing the function realizing means in the CPU 103 of FIG. 1, and is for explaining the recording control method in the present embodiment.

In FIG. 6, communication means 1, command request analysis means 2, data exchange means 3, recording speed setting means 4, disk rotation means 5, recording means 6, actual transfer rate calculation means 7, optimum recording speed calculation means 8 are shown. Are the same as those in the first embodiment, the same reference numerals are given and the description is omitted. Reference numeral 10 is a recording speed resetting means for resetting the optimum recording speed calculated by the optimum recording speed calculating means 8 as the recording speed for the optical disc 101.

In FIG. 6, during a test write at the rotation speed of the optical disk designated by the host PC 109, when a buffer underrun occurs in which the recording data is lost in the optical disk device memory 104,
Using the actual transfer rate calculation means 7 of the recording data between the host PC 109 and the optical disk device and the optimum recording speed calculation means 8, the recording speed at which the buffer underrun does not occur in the current recording environment is calculated, and the recording speed resetting means is performed. At 10, the optical disk device itself changes the rotation speed of the optical disk to the optimum recording speed. afterwards,
For the continuation of the test write operation and the actual recording operation,
Since the number of rotations of the medium is changed to the optimum recording speed, it is possible to perform the recording operation without causing the buffer underrun.

Next, a specific processing flow will be described with reference to FIGS. 4 and 7. FIG. 7 is a flowchart showing the flow of specific processing. Note that steps S21 to S31 in FIG. 7 are the same as steps S1 to S11 in FIG. 3, so description thereof will be omitted.

In FIG. 7, when the buffer underrun is determined during the test write (S27), the encoding process is suspended (S29), and the actual transfer rate V (in) of the recording data from the host PC 109 is calculated ( S3
1) Next, the recording unit 6 resets the recording speed within a range that does not exceed the calculated V (in) value, and continues the test write from step S21 (S3).
2, recording speed reset step).

As described above, regarding the concrete V (in) calculation method and the recording speed reset method,
This is the same as the first embodiment. In the present embodiment, as shown in FIG. 4, the retest write portion after the buffer underrun once occurs can be operated without generating the buffer underrun.

As described above, according to the present embodiment, by providing the recording speed resetting means 10 for resetting the calculated optimum recording speed as the recording speed for the optical disc, the optimum recording speed is provided to the host PC 109. Since the optical disc device does not need to receive the designated recording speed from the host PC 109 by setting it, the recording speed for the optical disc 101 can be set more quickly.

(Third Embodiment) The configuration of the optical disc device according to the third embodiment of the present invention is the same as that of the general optical disc device shown in FIG. 1, and the description thereof will be omitted.
The difference between the third embodiment and the first embodiment is that the CPU
This is the operation of the process on 103. FIG. 8 shows the CPU 1 of FIG.
3 is a functional block diagram showing the function realizing means in 03, and is for explaining the recording control method in the present embodiment.

In FIG. 8, the communication means 1, the recording speed setting means 4, the disk rotating means 5, the recording means 6, and the optimum recording speed providing means 9 are the same as those in the first embodiment, and therefore, the same reference numerals are given and described. Is omitted. 11 is the host P
Command request analysis means for communicating with C109, 12 data exchange means for receiving print data from the host PC 109, 13 recording speed storage means for storing the recording speed when a buffer underrun occurred in the past, and 14 is unnecessary. Is a recording speed clearing means for erasing the recording speed when the buffer underrun occurs.

In the optical disk device having such a configuration, the host PC 109 is provided with the recording speed when the buffer underrun occurs before the actual recording operation, so that the host PC 109 can perform the buffer underrun before the actual recording operation. By setting the recording speed in consideration of the recording speed information at the time of occurrence, the recording operation without buffer underrun is performed.

Next, the specific processing flow will be described with reference to FIGS.
Will be explained. FIG. 9 is a flowchart showing the processing of the recording speed when the buffer underrun occurs during the recording operation, and FIG. 10 shows the processing of the recording speed information request when the buffer underrun occurs before the actual recording from the host PC 109. It is a flowchart.

In FIG. 9, the recording means 6 determines whether or not a buffer underrun has occurred during the recording operation (S
41), if it is determined that it has occurred, the current recording speed (that is, the recording speed when the buffer underrun occurs) is stored in the recording speed information area when the buffer underrun occurs (S42, recording speed storing step). . If it is determined in step S41 that the buffer underrun has not occurred, the process ends.

In FIG. 10, the recording means 6 determines whether or not there is recording speed information at the time of occurrence of buffer underrun (S51). Host PC 10
9 (S52, recording speed providing step).
If it is determined in step S51 that there is no recording speed information when the buffer underrun occurs, the process ends. The recording speed clearing means 14 erases the stored recording speed at the time of occurrence of the buffer underrun, which is unnecessary (recording speed clear step).

As described above, according to this embodiment, the CP
U103 is a recording speed storage means 13 for storing the recording speed when a buffer underrun occurs in the past.
By including the optimum recording speed providing means 9 for providing the stored recording speed to the host PC 109 and the recording speed clearing means 14 for clearing the stored recording speed, the host PC 109 is under-buffered before the actual recording operation. Since it is possible to set the recording speed while considering the recording speed information when the run occurs,
The designated recording speed can be set without receiving the optimum recording speed provided from the optical disc device, and the optical disc device can quickly receive the designated recording speed.

[0058]

As described above, according to the optical disk device of the first aspect of the present invention, the optical pickup for recording information on the optical disk and reproducing the information from the optical disk, and the information for recording and reproducing the information. Memory, which is an area for temporarily storing data, and a host PC
An optical disk device having a host I / F control unit for communicating with
Calculates the actual transfer rate of the recording data from the host PC at the time when a buffer underrun occurs in which the recording data disappears in the memory during the test write at the recording speed for the optical disc specified by the host PC. The actual transfer rate calculating means, the optimum recording speed calculating means for calculating the optimum recording speed based on the calculated actual transfer rate, and the calculated optimum recording speed for the host PC.
By providing the optimum recording speed providing means provided to the host PC, the host PC can perform the actual recording operation even under the recording environment in which the buffer underrun occurs in the conventional case.
Using the provided optimum recording speed, the specified recording speed (recording speed for the optical disk specified by the host PC) so that buffer underrun does not occur
Can be transmitted to the optical disk device, so that the specified recording speed can be prevented from exceeding the actual recording data transfer rate in the optical disk device, and the occurrence of buffer underrun during the recording operation can be prevented. That is an advantageous effect.

According to the optical disk device of the second aspect, in the optical disk device of the first aspect, instead of the optimum recording speed providing means, a recording speed for resetting the calculated optimum recording speed as a recording speed for the optical disk. By providing the resetting means, the optical disk device does not need to provide the optimum recording speed to the host PC and receive the specified recording speed from the host PC, so that the recording speed for the optical disk can be set more quickly. It is possible to obtain the advantageous effect that it is possible to prevent the occurrence of the buffer underrun during the recording operation.

According to the optical disk device of the third aspect, an optical pickup for recording information on the optical disk and reproducing information from the optical disk, and for temporarily storing information for recording and reproduction. Memory that is an area and host I / for communicating with the host PC
An optical disk device having an F control unit and a CPU for controlling the whole, wherein the CPU stores in a host PC a recording speed storage means for storing a recording speed at the time of occurrence of a buffer underrun that has occurred in the past. By having the recording speed providing means for providing the recording speed and the recording speed clearing means for clearing the stored recording speed, the host PC records while considering the recording speed information when the buffer underrun occurs before the actual recording operation. Since the speed can be set, the specified recording speed can be set without receiving the optimum recording speed from the optical disk device, and the optical disk device can receive the specified recording speed quickly.
Moreover, there is an advantageous effect that it is possible to prevent the occurrence of buffer underrun during the recording operation.

According to the recording method in the optical disk device of the fourth aspect, an optical pickup for recording information on the optical disk and reproducing information from the optical disk, and temporarily storing information for recording and reproduction. An optical disk device having a memory, which is a storage area, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole, wherein the CPU is the host PC.
The host P at the time when a buffer underrun occurs where the recording data is lost in the memory during test writing at the recording speed for the optical disc specified by
Providing the actual transfer rate calculation step for calculating the actual transfer rate of the recording data from C, the optimum recording speed calculation step for calculating the optimum recording speed based on the calculated actual transfer rate, and the calculated optimum recording speed to the host PC By providing the optimum recording speed providing step, the host PC uses the provided optimum recording speed during the actual recording operation so that the buffer underrun does not occur at the specified recording speed (the optical disk specified by the host PC). Recording speed) can be transmitted to the optical disk device, so that in the optical disk device, it is possible to prevent the specified recording speed from exceeding the actual transfer rate of the recording data, and prevent the occurrence of buffer underrun during the recording operation. The advantageous effect of being able to do is obtained.

According to the recording method in the optical disk device of the fifth aspect, in the recording method in the optical disk device of the fourth aspect, the calculated optimum recording speed is replaced by the calculated optimum recording speed in place of the optimum recording speed providing step. By providing a recording speed resetting step for resetting as described above, the optical disk device does not need to provide the optimum recording speed to the host PC and receive the specified recording speed from the host PC. There is an advantageous effect that the recording speed for the can be set and the occurrence of buffer underrun during the recording operation can be prevented.

According to the recording method in the optical disk device of the sixth aspect, an optical pickup for recording information on the optical disk and reproducing information from the optical disk, and temporarily storing information for recording and reproduction. An optical disk device having a memory, which is an area for storing data, a host I / F control unit for communicating with a host PC, and a CPU for controlling the whole, wherein the CPU is provided when a buffer underrun occurs in the past. The recording speed storing step of storing the recording speed of the recording medium, the recording speed providing step of providing the recording speed stored to the host PC, and the recording speed clearing step of clearing the recorded recording speed are performed, so that the actual recording operation is performed. Before the host PC considers the recording speed information when the buffer underrun occurs Since the recording speed can be set, the specified recording speed can be set without receiving the optimum recording speed from the optical disk device, and the optical disk device can receive the specified recording speed quickly, and The advantageous effect that it is possible to prevent the occurrence of buffer underrun during the recording operation is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a general optical disc device (optical disc drive device).

FIG. 2 is a functional block diagram showing a function realizing means in the CPU of FIG.

FIG. 3 is a flowchart showing a specific method for calculating an optimum recording speed.

FIG. 4 is a timing chart showing recording data in a recording buffer (recording buffer area in the memory).

FIG. 5 is a data diagram showing a correspondence between a recording double speed and a recording transfer rate.

6 is a functional block diagram showing a function realizing means in the CPU of FIG.

FIG. 7 is a flowchart showing a specific processing flow.

8 is a functional block diagram showing a function realizing means in the CPU of FIG.

FIG. 9 is a flowchart showing a recording speed process when a buffer underrun occurs during a recording operation.

FIG. 10 is a flowchart showing a process of requesting recording speed information when a buffer underrun occurs before actual recording from the host PC.

FIG. 11 is a block diagram showing a CPU constituting a conventional optical disc device.

12 is a flowchart showing the operation of the CPU of FIG. 11 in detail.

FIG. 13 is a timing diagram showing a case where a buffer underrun does not occur.

FIG. 14 is a timing diagram showing a case where a buffer underrun occurs.

FIG. 15 is a data diagram showing an example of a WRITE command for requesting recording.

FIG. 16: FLUSH C which is a recording end instruction command
Data diagram showing an example of the ACHE command

[Explanation of symbols]

1 Communication Means 2 Command Request Analyzing Means 3 Data Exchange Means 4 Recording Speed Setting Means 5 Disk Rotating Means 6 Recording Means 7 Actual Transfer Rate Calculating Means 8 Optimum Recording Speed Calculating Means 9 Optimum Recording Speed Providing Means 10 Recording Speed Resetting Means 11 Commands Request analysis means 12 Data exchange means 13 Recording speed storage means 14 Recording speed clear means 101 Optical disc 102 Optical pickup 103 CPU (Central processing unit) 104 Memory 105 Host interface control unit (Host I / F control unit) 106 Encoder 107 Decoder 108 DSP 109 Host PC

Claims (6)

[Claims] 1. An optical pickup for recording information on an optical disc and reproducing information from the optical disc, a memory as an area for temporarily storing information for the recording and reproduction, and a host PC. An optical disc apparatus having a host I / F control unit for communicating with the optical disc, and a CPU for controlling the whole, wherein the CPU is for recording data during a test write at a recording speed for the optical disc designated by the host PC. And an optimum recording speed based on the calculated actual transfer rate, and an actual transfer rate calculating means for calculating an actual transfer rate of the recording data from the host PC at the time of occurrence of a buffer underrun that disappears in the memory. And an optimum recording speed calculating means for calculating the calculated optimum recording speed to the host PC. An optical disk device having an optimum recording speed providing means to be provided. 2. In place of the optimum recording speed providing means,
2. The optical disk device according to claim 1, further comprising recording speed resetting means for resetting the calculated optimum recording speed as a recording speed for the optical disk. 3. An optical pickup for recording information on an optical disc and reproducing information from the optical disc, a memory which is an area for temporarily storing information for the recording and reproduction, and a host PC. Is an optical disc apparatus having a host I / F control unit for communicating with the CPU, and a CPU for controlling the whole, wherein the CPU stores a recording speed when a buffer underrun occurs in the past. An optical disk device comprising: a recording speed providing means for providing the stored recording speed to the host PC; and a recording speed clear means for clearing the stored recording speed. 4. An optical pickup for recording information on an optical disc and reproducing information from the optical disc, a memory which is an area for temporarily storing information for the recording and reproduction, and a host PC. Is a recording method of an optical disc apparatus having a host I / F control unit for communicating with the optical disc and a CPU for controlling the whole, wherein the CPU is provided during a test write at a recording speed for the optical disc designated by the host PC. Based on the calculated actual transfer rate, an actual transfer rate calculation step of calculating an actual transfer rate of the recorded data from the host PC at the time when a buffer underrun occurs in which the recording data disappears from the memory. The optimum recording speed calculation step for calculating the optimum recording speed and the calculated optimum recording speed A step of providing an optimum recording speed for providing the host PC. 5. The recording speed resetting step of resetting the calculated optimum recording speed as a recording speed for the optical disc, instead of the optimum recording speed providing step. Recording method. 6. An optical pickup for recording information on an optical disc and reproducing information from the optical disc, a memory as an area for temporarily storing information for the recording and reproduction, and a host PC. Is a recording method of an optical disk device having a host I / F control unit for communicating with a CPU, and a CPU for controlling the whole, wherein the CPU stores a recording speed at a buffer underrun occurrence that occurred in the past. A recording method comprising a speed storing step, a recording speed providing step of providing the stored recording speed to the host PC, and a recording speed clearing step of clearing the stored recording speed.