JPH10106156A - Information recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a block under write operation effective even when a buffer underrun takes place during the time of writing data continuously on an information recording medium. SOLUTION: When the buffer underrun takes place during the time of writing continuous data in a unit of one block on the information recording medium 7, write of the data in this block is completed, and remaining data which could not be written out of the continuous data is written in the following block next to this data write-in completion block, and block information about data write-in blocks is written in a management area of the information recording medium 7 by a CPU 2, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an information recording device such as an optical disk device.

[0002]

2. Description of the Related Art In a conventional information recording apparatus which records continuous data on an information recording medium such as an optical disk as one block, data cannot be added from the middle of the block. For example, in a CD-R drive device, a CD-R medium, which is an information recording medium used for the drive, is write-once and cannot overwrite a track on which data has been written once. Data cannot be added from.
Therefore, at the time of data recording, it is necessary to write data in a track at a stretch.

[0003]

However, in the conventional information recording apparatus, if the data transfer speed is lower than the data write speed, a buffer underrun occurs and the data write fails on the way, and the block becomes unusable. There was a problem that it became impossible. The present invention has been made in view of the above points, and it is an object of the present invention to enable a block being written to be effective even if a buffer underrun occurs while writing continuous data to an information recording medium. I do.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an information recording apparatus provided with means for writing continuous data to an information recording medium. When a buffer underrun occurs while writing data, the means for completing the writing of data to the block and the means for completing the writing of data by the means fail to write the continuous data to the next block. There are provided means for writing the remaining data and means for writing the block information of the block in which the data has been written to the management area of the information recording medium.

Further, in an information recording apparatus provided with means for writing continuous data to an information recording medium, when a buffer underrun occurs while continuous data is being written to a block previously secured on the information recording medium, an error is generated. Means for writing the dummy data in the remaining area in the block, means for writing the remaining data in which the continuous data could not be written in the next block in which the dummy data was written by the means, and a block of the block in which the data was written Means for writing information into the management area of the information recording medium may be provided.

Further, in an information recording apparatus provided with a means for writing continuous data to an information recording medium, when a buffer underrun occurs while writing continuous data to a block previously secured on the information recording medium, When the remaining area in the block is equal to or larger than the amount that can add a new block, means for once completing the writing of data to the block and the remaining area of the block for which data writing has been completed by the means Means for setting a new block and writing the remaining data which could not be written in the continuous data, means for writing the remaining data which could not be further written by the means to a block next to the block, and writing the data Means for writing block information of a block into a management area of the information recording medium It may be provided.

Further, when the block information of the previously secured block is written in the management area, a skip block is set for the block information to invalidate the block information, and the information of the block in which the data is actually written is newly added. And a means for newly writing information of a block in which data has been actually written when the block information of the previously secured block is not written in the management area.

Further, when the block is a part of the divided block, means for writing the logical block information into the management area may be provided.

According to the information recording apparatus of the first aspect of the present invention, even if a buffer underrun occurs at the time of writing data to the information recording medium, the block before the occurrence can be effectively used. At the same time, the remaining data that could not be written can be written to the next block and each block can be managed so as to be reproducible, so that the block being written becomes unusable due to the occurrence of a buffer underrun during data writing. Can be avoided.

[0010] Further, even when data is written by a host computer having a slow data transfer, the data can be written reliably without fear of occurrence of buffer underrun. Furthermore, buffer capacity can be saved. Furthermore, since the block information of the block to which the data has been written by the buffer underrun is written to the management area, the data of the block at the write destination can be easily reproduced based on the block information.

According to the information recording apparatus of the second aspect of the present invention, with the above configuration, even if a buffer underrun occurs during data writing to a previously secured block of the information recording medium, Thus, it is possible to prevent the block from becoming unusable by completing the data writing to all the areas in the block.

Further, according to the information recording apparatus of the third aspect of the present invention, by configuring as described above, an unwritten area is set such that a new block can be set while writing data to a previously secured block. Even if a buffer underrun occurs in the remaining state, data can be written and used reproducibly in the unwritten area, and the recording area of the information recording medium is effectively used to minimize the wasted area. Can be suppressed.

According to the information recording apparatus of the fourth aspect of the present invention, even if a buffer underrun occurs during the writing of data, the block of the block to which the data is actually written can be obtained even if a buffer underrun occurs during the writing of the data. Information can be recorded, and the amount of data written in the block can be easily known based on the block information.

Further, according to the information recording apparatus of the present invention, when the block information of the divided blocks is written in the management area of the information recording medium, a plurality of logical blocks can be written. , Logical block information such as a logical block number, a leading block number, and the like, which can be easily reconstructed based on the logical block information. it can.

[0015]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an information recording apparatus according to an embodiment of the present invention. The information recording device 1 is connected to a host computer 8 such as a personal computer so that data can be exchanged.

The information recording apparatus 1 includes a CPU 2, a ROM 3, a RAM 4, an interface (I / F) control unit 5, and a read / write control unit 6 realized by a microcomputer. Processing such as writing data from the host computer 8 and transmitting data recorded on the information recording medium 7 to the host computer 8 is performed.

The CPU 2 controls the entire information recording apparatus based on control software stored in the ROM 3. The RAM 4 is a working memory when the CPU 2 executes the control software. The I / F control unit 5 controls transmission and reception of commands and data to and from the host computer 8. The read / write control unit 6 controls writing and reading of data to and from the information recording medium 7.

FIG. 2 is a diagram showing a schematic configuration of a CD-R drive device which is another embodiment of the information recording device of the present invention. This CD-R drive device is connected so as to exchange data with a host computer 21 such as a personal computer, writes data from the host computer 21 to the CD-R disk 11, and records the data on the CD-R disk 21. Host computer 2
1 and the like.

The CD-R drive includes a microcomputer and includes a motor 12, a rotation control unit 13, a pickup 14, an actuator control unit 15, and a signal control unit 1.
6, a drive controller 17, a memory 18, a laser drive circuit 19, an external interface 20, and the like.

The CD-R disc 11 is an information recording medium for recording various data on a recording surface. Motor 12 is C
The DR disk 11 is rotated. The rotation control unit 13 performs control for rotating the motor 12 at a predetermined rotation speed. The pickup 14 irradiates the recording surface of the CD-R disc 11 with a laser beam L to record and reproduce data.

An actuator controller 15 controls the pickup 14 to move with respect to the CD-R disk 11. The signal control unit 16 controls a signal output from the pickup 14. Drive controller 17 is CP
U, ROM, RAM, etc.
-Controls the entire R drive device.

The memory 18 is used by the drive controller 17 as a temporary storage area for storing data. The laser drive circuit 19 controls the output of the laser light L from the pickup 14. The external interface 20 controls transmission and reception of various commands and data with the host computer 21.

That is, when the CPU 2, the drive controller 17 and the like write continuous data to the information recording medium, and when a buffer underrun occurs while writing continuous data in units of one block on the information recording medium, Means for completing the writing of data to the block, means for writing the remaining data for which the continuous data could not be written to the block next to the block for which writing of data was completed by the means, and writing of the data It functions as a means for writing the block information of the block into the management area of the information recording medium.

Further, when a buffer underrun occurs while writing continuous data to a block previously secured on the information recording medium, means for writing dummy data in the remaining area in the block, and dummy data by the means. The function of means for writing the remaining data to which the continuous data could not be written in the next block in which the data has been written, and the means for writing the block information of the block in which the data has been written to the management area of the information recording medium.

Further, when a buffer underrun occurs while writing continuous data to a block previously secured on the information recording medium, and when the remaining area in the block is larger than a new block can be added, Means for temporarily completing the writing of data to the block, and setting a new block in the remaining area of the block for which data writing has been completed by the means, and writing the remaining data to which the continuous data could not be written Means, means for writing remaining data which has not been further written by the means to a block next to the block, and means for writing block information of the block in which the data has been written to a management area of the information recording medium.

When the block information of the previously secured block has been written in the management area, a skip block is set for the block information to invalidate the block information, and the information of the block in which the data is actually written is newly added. When the block information of the previously secured block is not written in the management area, the function of newly writing the information of the block in which the data is actually written is performed. Further, when the block is a part of the divided block, it functions as a unit for writing the logical block information in the management area.

FIG. 3 is a diagram showing the format of a CD-R disc. A plurality of sessions are set on the recording surface of the CD-R disc, and a power calibration area (PCA area), a management area (PMA area) ), A plurality of tracks, a lead-in area, and a lead-out area.

The PCA area is an area where test writing is performed in order to set the power of laser light to an optimum value when data is written on a CD-R disc, and a large number of test areas are provided so that test writing can be performed a plurality of times. Is secured. PMA
The area is a management area for recording track information of the entire disc across sessions, and the track information is recorded in the table of contents information area (TOC) when writing to the lead-in area.

The lead-in area is an area for recording session track information as a TOC. The track is an area for recording data transmitted from the host computer. The lead-out area is an area indicating the end of the session.

FIG. 4 is a diagram showing a format of a basic block of a CD-R disc. In the basic block, for example, one block is composed of 98 frames, and one frame is composed of 588 channel bits.

The data portion of the data and the parity includes a CD-
One block of DA, CD-ROM (XA) or the like is recorded. The subcoding includes P, Q, R, S, T, U,
There are V and W channels, which are used when the CD-R drive controls and displays disc information.

Then, frame synchronization of frame 0, sub-coding, data and parity, frame synchronization of frame 1, sub-coding, data and parity are recorded in the frame order.

(1) Next, referring to FIG. 5, a description will be given of a data write process when a buffer underrun occurs in the information recording apparatus. In this process, at the time of writing a track (block), it is determined in step (indicated by “S” in the figure) 1 whether or not there is data to be written in the buffer.
If there is, the process proceeds to step 2 to write the data in the buffer. The process proceeds to step 3 to determine whether or not the data writing is completed. When the data writing is completed, the process ends.

If there is no data in the buffer in the determination in step 1, it is determined that a buffer underrun has occurred, the flow advances to step 4 to complete the writing of data to the track, and the flow advances to step 5 to create a new track. Then, go to Step 3 to judge whether the data writing is completed or not, and repeatedly create a new track and write data to it until all the data are written, and the writing of all data is completed. Then, this process ends.

In this way, when a buffer underrun occurs when writing tracks on the optical disk, the writing to that track is completed, and the remaining data that could not be written is written to the next track so that each block can be reproduced. Since the management is performed, the track being written can be used even when a buffer underrun occurs at the time of data writing from a host computer with slow data transfer. Further, the buffer capacity for temporarily holding data from the host computer can be saved.

(2) Next, the processing at the time of writing dummy data in the information recording apparatus will be described with reference to FIG. This process is performed when a buffer underrun occurs while writing data to a previously secured track.
In step 11, dummy data is written in the remaining area of the previously secured track, and the process proceeds to step 12, in which a new track is created and the next remaining data is written, and the process ends.

As described above, when data is written by securing a track on the optical disk in advance, when a buffer underrun occurs during data writing to the track, dummy data is transferred to all the remaining areas in the track. Is written to complete the data writing, so that the track can be used.

(3) Next, referring to FIG. 7, a description will be given of a process for dividing a previously secured track in the information recording apparatus. In this process, when a buffer underrun occurs during the writing of data to a previously secured track, an empty area of a predetermined amount or more, that is, an empty area for creating a new track remains in the track previously secured in step 21. It is determined whether or not.

If it remains in the judgment of step 21, the program proceeds to step 22 to complete the writing of data to the track, and a new track is created in the secured track. Write the following data, go to step 24, create a new track and write the remaining data that could not be written,
This processing ends.

If it is determined in step 21 that there is no remaining data, the flow advances to step 25 to write dummy data in the remaining area of the secured track, and the flow advances to step 24 to create a new track and write the remaining data. The data is written, and the process ends.

In this way, if a buffer underrun occurs during the writing of data to the track previously secured on the optical disk, the track is completed at that point and the remaining area of the track being written sets a new block. When the amount is as large as possible, a new track is set in that area and the remaining unwritten data is written.
The area in which the recording area of the optical disc is invalidated can be minimized and can be effectively used without waste.

(4) Next, a process for setting track information in a PMA area (management area) in the information recording apparatus will be described with reference to FIG. In this process, it is determined whether or not track information has been written in the PMA area of the optical disk in step 31. If the track information has been written, the process proceeds to step 32, where information for designating the track division as a skip track is written in the PMA area. Then, the process proceeds to step 33, at which the block information of the block in which the data has actually been written is written into the PMA area, and this processing ends.

If it is determined in step 31 that the track information has not been written in the PMA area, the flow advances to step 33 to write the block information of the block in which the data has been actually written in the PMA area, and this processing ends.

In this way, even if a buffer underrun occurs during data writing and the data writing is completed as described above, the written data can be easily reproduced based on the information in the PMA area. it can.

(5) Next, a process for writing logical track information (logical block information) in the PMA area in the information recording apparatus will be described with reference to FIG. In this process, when the track information is written in the PMA area, it is determined in step 41 whether or not the track is a part of the divided track.

If the track is divided by the judgment in step 41, the process proceeds to step 42, where the logical track such as an identifier indicating that the track is composed of a plurality of logical tracks in the PMA area, a logical track number, and a leading track number. The information is written, and the process ends. Step 4
If the track is not a divided track in the judgment of step 1, step 4
The process proceeds to 3 and ends this processing without writing the logical track information in the PMA area.

As described above, when writing the block information of the divided blocks in the PMA area of the optical disc,
Since logical block information such as an identifier indicating that the block is composed of a plurality of logical blocks, a logical block number, and a leading block number is recorded, it is easy to reconstruct a divided block based on the logical block information. Can be.

(6) Next, referring to FIG. 10, a description will be given of a process for writing a logical track number in a subcode in the information recording apparatus. This processing is performed when a track is divided due to the occurrence of a buffer underrun.
In step 51, a logical track number is set in the subcode of the second and subsequent tracks, and the flow advances to step 52 to write data and end this processing.

(7) Next, a process for reading a track in the information recording apparatus will be described with reference to FIG. This processing is performed when a track is read in step 6
At step 1, the track is reproduced based on the logical track number of the subcode, and the routine proceeds to step 62, where the data of the reproduced track is transferred to the host computer, and the process is terminated.

As described above, since the logical track number is recorded in the subcode, the data of the track divided by the above processing can be read as the data of one track.

(8) Next, referring to FIG. 12, a description will be given of a process for writing a PMA area and a table of contents information area (TOC) in this information recording apparatus. This processing is
When writing track information in the A area and the TOC, it is determined whether or not the track is divided in step 71, and
If it is a divided track, the process proceeds to step 72, where logical track information is written in the PMA area or the data section of the TOC, and this processing ends.

If the track is not a divided track in the judgment of step 71, the process proceeds to step 73, where the logical track information is not written in the data section of the PMA area or the TOC, and this processing is ended.

As described above, since the logical track information is written in the PMA area and the user data section of the TOC, the track divided by the above processing can be easily reconstructed based on the information. Also, since the logical track information is written in the user data section of the TOC, a normal CD-
Even the ROM device can easily reconstruct the track divided by the above processing based on the information.

[0054]

As described above, according to the information recording apparatus of the present invention, even if a buffer underrun occurs while writing continuous data to the information recording medium, the block being written is made valid. be able to.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an information recording apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a CD-R drive device which is another embodiment of the information recording device of the present invention.

FIG. 3 is a diagram showing a format of a CD-R disc.

FIG. 4 is a diagram showing a format of a basic block of a CD-R disc.

FIG. 5 is a flowchart illustrating a data write process when a buffer underrun occurs in the information recording apparatus according to the embodiment of the present invention.

FIG. 6 is a flowchart illustrating processing when writing dummy data in the information recording apparatus according to the embodiment of the present invention.

FIG. 7 is a flowchart showing processing when dividing a previously secured track in the information recording apparatus of the embodiment of the present invention.

FIG. 8 is a flowchart illustrating a process when setting track information in a management area in the information recording apparatus according to the embodiment of the present invention.

FIG. 9 shows P in the information recording apparatus according to the embodiment of the present invention.
9 is a flowchart illustrating a process when writing logical track information to an MA area.

FIG. 10 is a flowchart showing processing when a logical track number is written in a subcode in the information recording apparatus according to the embodiment of the present invention.

FIG. 11 is a flowchart showing a process when reading a track in the information recording apparatus of the embodiment of the present invention.

FIG. 12 is a flowchart showing processing when writing a PMA area and a TOC in the information recording apparatus of the embodiment of the present invention.

[Explanation of symbols]

 1: information recording device 2: CPU 3: ROM 4: RAM 5: interface (I / F) control unit 6: read / write control unit 7: information recording medium 8, 21: host computer 11: CD-R disk 12: Motor 13: Rotation control unit 14: Pickup 15: Actuator control unit 16: Signal control unit 17: Drive controller 18: Memory 19: Laser drive circuit 20: External interface

Claims (5)

[Claims] 1. An information recording apparatus comprising means for writing continuous data to an information recording medium, wherein when a buffer underrun occurs while writing continuous data in block units on the information recording medium,
Means for completing the writing of data to the block, means for writing the remaining data for which the continuous data could not be written to a block next to the block for which data writing has been completed by the means, and writing of the data. Means for writing block information of a block into a management area of the information recording medium. 2. An information recording apparatus comprising means for writing continuous data to an information recording medium, wherein when a buffer underrun occurs while writing continuous data to a block previously secured on the information recording medium, Means for writing dummy data in the remaining area in the block, means for writing the remaining data to which the continuous data could not be written in the next block to which the dummy data has been written by the means, and blocks for writing the data Means for writing information to a management area of the information recording medium. 3. An information recording device comprising means for writing continuous data to an information recording medium, wherein when a buffer underrun occurs while writing continuous data to a block previously secured on the information recording medium, When the remaining area in the block is equal to or larger than the amount at which a new block can be added, means for once completing the writing of data to the block and the remaining area of the block for which data writing has been completed by the means. Means for setting a new block to write the remaining data which could not be written in the continuous data, means for writing the remaining data which could not be further written by the means to a block next to the block, and writing the data Means for writing the block information of the block into the management area of the information recording medium. Information recording apparatus characterized and. 4. The information recording apparatus according to claim 1, wherein when block information of the previously secured block is written in the management area, a skip block is set for the block information to invalidate the block information. Means for newly writing information of a block to which data has actually been written, and means for newly writing information of a block to which data has been actually written when block information of the previously secured block has not been written to the management area. An information recording device comprising: 5. The information recording apparatus according to claim 1, further comprising: a unit for writing logical block information to the management area when the block is a part of a divided block. Recording device.