JPH02183472A - Direct read after write type optical disk write control system - Google Patents

Abstract

PURPOSE:To facilitate the rewriting of recorded data by executing rewrite onto a recorded block in accordance with a special write command. CONSTITUTION:An MPU 11 receives a command from a high-order host device 2, and when this command is a 'special write command', even if it is detected that a block designated by the command is written already, it is executed without setting it as an error, and by controlling a read/write control circuit 14, write is executed to a designated recorded block of an optical disk medium 16. In the circuit 14, it is detected that write data is not reproduced normally by read-out after recording, a shift processing factor generating means 141 generates a shift processing factor, and the MPU 11 checks up an idle state of a shift area, based on a shift processing procedure, assigns the shift area and executes write of data.

Description

[Detailed Description of the Invention] [Summary] Regarding write control on a write-once optical disk medium, data can be written on a write-once optical disk, but data cannot be rewritten, so management information of data on the optical disk medium is The purpose is to solve the problem that data must be recorded and managed on a separate rewritable medium, and that updating data on an optical disk medium requires a cumbersome procedure.
The read/write control circuit includes replacement processing factor generating means for generating a replacement processing factor that searches for a vacant space in a predetermined replacement area and performs writing to the predetermined replacement area when recorded data is not normally reproduced. In addition, a special write command is provided between the upper host device and the optical disk device that executes writing to a recorded block without reporting an error. When a write command is received, by rewriting on the already recorded block, a replacement processing factor is intentionally generated, writing is performed in the free area of the replacement area, and a read command is issued for the multiple-written block. When a block is received, the data is not reproduced normally, so a replacement area is searched, a target block is detected, and reading is performed.

[Industrial application field]

The present invention relates to an optical disc device, and more particularly to a write control method for a write-once optical disc device.

Write-once optical discs have a large capacity and allow additional data to be written, but the data cannot be rewritten. Therefore, the management information for the data on the optical disc medium is recorded and managed on a separate rewritable medium, and the optical data When updating data on a medium, the troublesome process of accessing another recording medium that stores management information, rewriting the management information, and then accessing the optical disk and recording the updated data in an unrecorded area on the optical disk medium is necessary. Procedures are required.

[Conventional technology]

In a write-once optical disc device, since data cannot be rewritten, the data directory (management information) on the optical disc medium is stored on another rewritable recording medium (if
FF-hard disks, floppy disks, etc.).

FIG. 7 is a diagram showing the configuration of data management according to the prior art.

The optical disk medium in the figure has 5 tracks and 8 sectors, as shown in (a), and the data recorded on it is registered as file A in a directory within the magnetic disk. As shown in (b), it is recorded in the directory as track 01 sector θ~3, length 4.

[Problem to be solved by the invention]

With conventional write-once optical discs, data cannot be rewritten, so when updating data on the optical disc medium,
As shown in FIG. 7(d), the data on the magnetic disk holding that directory is rewritten, and the updated data is transferred to an unrecorded area on the optical disk medium (in this example,
As shown in C), it must be recorded on track O, sectors 4 to 7).

In other words, when updating data on a write-once optical disc, it is necessary to rewrite the data on another recording medium and write it to the optical disc medium, which requires a troublesome procedure on the host device. However, there is a problem in that it takes a long processing time.

The problem to be solved by the present invention is to provide a write-once optical disc write control system that solves these conventional problems and facilitates rewriting of recorded data.

[Means to solve the problem]

FIG. 1 is a block diagram showing the configuration of the present invention.

In the figure, 1 is an optical disk device, and 2 is a host device.

10 is a control section of the optical disc device, and 15 is a drive section.

11 is a microprocessor (MPU), and ROM1
2 and RAM 13 to receive commands from the host device 2 and control the read/write control circuit 14.

Reference numeral 14 denotes a read/write control circuit, which reads from and writes to the optical disk medium 16 under control from the MPU II.

The read/write control circuit 14 is equipped with a replacement processing factor generating means 141 that generates a replacement processing factor when re-recording is performed on a recorded block.

The upper host device 2 is equipped with a "special write command" that allows recording (writing) to recorded blocks, and when the optical disk device 1 receives this special write command, it does not treat the recorded block as an error. Rewrite on top of the block.

[For production]

In the present invention, the MPU 1i receives a command from the upper host device, and if this command is a "special write command", it does not treat it as an error even if it detects that the block specified by the command has been written. Run
The optical disk medium 16 is controlled by the read/write control circuit.
writes to the specified recorded block.

The read/write control circuit 14 detects that the written data is not normally reproduced by reading after recording,
The replacement processing factor generating means 141 generates a replacement processing factor,
Based on the replacement processing procedure, the MPU II checks the availability of the replacement area, allocates the replacement area, and writes data.

In a write-once optical disk device, the data is read after recording to determine whether the data was recorded normally. If the data is not reproduced normally, the data to be recorded is transferred to a pre-allocated replacement area. recorded in unrecorded blocks (sectors). This is the replacement process.

When reading data, if you try to read the above block, the data will not be reproduced normally, just like when recording, so if you search for a replacement area and find the target block,
The data there is read and transferred to the higher-level device.

FIG. 8 shows the state of alternation processing when recording on track 2/sector 7. FIG. 9 is a diagram showing a processing situation when reading data from track 2/sector 7 that has been subjected to alternation processing. In the examples shown in FIGS. 8 and 9, it is assumed that the alternate areas on the optical data medium are track 4/sectors O to 8, and sector 5 has already been used (recorded).

As mentioned above, in the write-once optical disc device, the alternation process is a process that is normally performed, and therefore the alternation process factor generating means 141 in the read/write control circuit 14 is a means that is normally provided.

In the above explanation, only directories are recorded in the replacement area by issuing a "special write command" to intentionally generate a replacement processing factor, but it is clear that normal file data can also be used in the same way. It is. However, in this case, a large replacement area is required.

In the present invention, a "special write command" that allows writing to a recorded block is prepared, and when this command is issued, the cause of replacement processing is forcibly rewritten to the recorded block. The data is generated and automatically written to the replacement area. Therefore, the directory can also be rewritten on the optical disc medium.

On the upper host device, just by issuing a "special write command" when updating a directory, updated data is automatically written in the alternate area, and when reading a directory, a command to read the storage location of the first directory is issued. For example, it is possible to automatically read the update directory in the alternate area, and from the perspective of the host device, it looks like the optical disk medium is now rewritable.
Soft air is simplified.

〔Example〕

The present invention will be explained in more detail below with reference to embodiments shown in FIGS. 2 to 6.

FIG. 2 is a flowchart showing the operation when receiving a recording command in one embodiment of the present invention.

In this embodiment, the normal recording command is command W, and the special write command that allows recording to a recorded block is command WX. The operation will be described below according to the processing steps of the flowchart.

■Receive recording commands.

- Check the block specified by the recording command using the recording block management table to determine whether it has been recorded or not. If it has not been recorded, proceed to step ■; if it has been recorded, proceed to step ■.

■Perform normal recording operations.

■Identifies whether the received command is WX. If it is not WX, proceed to step ■; if it is WX, proceed to step ■.

■Reports the error to the host device and jumps to step [phase].

■Start recording operation.

(2) An alternation process factor is generated from the read/write control circuit, so execute the alternation process. That is, a free space in the replacement area is found and recording is performed.

■End the recording operation.

■Report the normal completion of the command to the higher-level device.

[Phase] Ends processing for the recording command.

FIG. 3 shows an example of processing according to an embodiment of the present invention, and FIG. 4 shows a flowchart of the operation at that time.

In this processing example, as shown in FIG. 3(a), the initial state is that the directory is on track 0/sector O and the file A is
The data is recorded on track 1/sectors 0 to 3, and the replacement area is track 4/sectors O to 7 (all unrecorded).
We assume that. Therefore, the data regarding file A in the directory is as shown in FIG.

The operation when the upper host device rewrites a file is as follows, as shown in FIG.

(1) In order to rewrite file A on the optical disk medium, the upper host device first issues a free space search command.

(2) The control unit searches for free space in response to this command, detects track 1/sectors 4 to 7, and reports it to the host device.

(3) The upper host device issues a command W to write rewrite data to tracks 1/secs 4 to 7.

(4) The control unit executes the command W, and upon completion, reports the normal completion of the command.

(5) The upper host device receives the report of the normal completion of the command, recognizes the success of data rewriting, and (6) issues a write command WX to write the rewritten data of the directory to track O/sector 0.

(7) When the control unit executes the command WX and writes to the recorded track O/sector 0, an alternation processing factor occurs. (9) Writes new directory data to track 4/sector O and reports normal completion of the command.

00) Upon receiving the command completion report, it recognizes that the directory rewriting has been successful, and ends the file A rewriting process.

FIG. 5 shows another example of processing according to an embodiment of the present invention, and FIG. 6 is a flowchart showing the flow of processing at that time.

The processing example shown in FIGS. 5 and 6 is the process for rewriting file A after the rewriting of file A and the associated directory rewriting shown in FIGS. 3 and 4. (a) and (b) in Fig. 5 are the same as (C) and (d) in Fig. 3.

The operation will be described below with reference to FIG. 5 and according to the processing steps of the flowchart in FIG. 6.

01) In order to further rewrite file A on the optical disk medium, the upper host device first issues a free space search command.

02) The control unit searches for free space in response to this command, detects track 2/sector θ to 3, and reports it to the host device.

03) The upper host device has track 2/sectors 0 to 3 (
Command W to write rewritten data in Figure 5 (C))
Issue.

The control unit executes the command W, and upon completion, reports the normal completion of the command.

The host device receives the report of the normal completion of the command, recognizes the success of data rewriting, and updates the track 0/06 of the updated directory data (Figure 5 (b)).
Issue a write command WX to sector 0.

0'? ) When the control unit executes the command WX and writes to the recorded track O/sector O, an alternation processing factor occurs, and 08) Searches for an empty area in the alternation area and detects track 4/sefta l, Since side track 4/sector 1 is not the beginning of the replacement area, check whether there is rewritten data in the previous track 4/sector 0, and if there is, erase it (write a special mark over the recorded data) .When reading, if this mark is detected, it is known that the data is invalid).

(Writes the updated directory data in 21 track 4/sector 1 (FIG. 5(C)) and reports normal completion of the command.

Upon receiving the r2D command completion report, it recognizes that the directory rewrite has been successful, and ends the file A rewrite process.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, recorded blocks can be rewritten even in a write-once type optical disk device from the perspective of the host device, and the recorded blocks can be transferred to another rewritable medium in order to rewrite the directory. There are significant industrial benefits in that access is eliminated, software is simplified, and processing efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a flowchart showing processing according to an embodiment of the invention, FIGS. 3 and 5 are diagrams showing processing examples according to an embodiment of the invention, 4 and 6 are flowcharts showing a processing example according to an embodiment of the present invention, FIG. 7 is a diagram showing a data management configuration of a write-once optical disc according to the prior art, and FIGS. 8 and 9 are replacements in an optical disc. It is a figure which shows a process. In the figure, 1 is an optical disk device, 2 is a host device, 10 is a control unit, 11 is an MPU, 12 is a ROM,
13 is RAM. 14 is a read/write control circuit, 15 is a drive unit, 16 is an optical disk medium, 1
41 indicates a replacement processing factor generation means. FIG. l is a block diagram showing the configuration of the present invention; FIG. l is a flowchart showing a process according to an embodiment of the present invention;
Flowchart showing an example of processing according to an embodiment of the present invention (now/11)
Part 2) Figure 1 shows the alternation process on an optical disk (Part 1) Figure 1 shows the data management configuration of a write-once optical disk according to the prior art Figure 1 shows the data management configuration of a write-once optical disk Part 2) Figure

Claims (1)

[Claims] Receive commands from the host device (2) to control the read/write control circuit (14), read from the optical disk medium (16), and control the read/write control circuit (14) from the optical disk medium (16).
In a write-once optical disc device (1) that writes data to a computer, the read/write control circuit (14) is configured to search for an empty space in a predetermined replacement area and write data to the area when the recorded data is not reproduced normally. It is provided with an alternate processing factor generation means (141) that generates an alternate processing factor for processing to perform the process, and also includes an alternate processing factor generating means (141) that generates an alternate processing factor for processing to perform a When the optical disk device (1) receives a special write command to a recorded block from the upper host device (2), it rewrites the recorded block. By doing this, a replacement processing factor is intentionally generated and writing is performed in a free area of the replacement area, and when a read command for the multiple written block is received, the data is not reproduced normally and the replacement area is 1. A write-once optical disc write control system, characterized in that the write-once optical disc write control method is configured to search for a target block, detect the target block, and perform reading.