JPS63113984A - Optical disk control system - Google Patents

Abstract

PURPOSE:To execute a writing processing at a high speed and to improve a space efficiency by recording spirally data on an optical disk, holding the writing-defect data in a buffer memory and thereafter, re-writing them in a lump. CONSTITUTION:A writing mechanism 2 records spirally data into an optical disk 1 and executes the reproduction. A deciding mechanism 3 reads and decides the quality of the writing condition simultaneously at the time of writing the data. When the written data are decided to be defective by the mechanism, the data are held at a buffer memory 4. At the time of writing to plural tracks, the data, which are decided to be a writing defect, are successively held at a memory 4 and a series of data is continuously written. When the writing is completed, the data, which are held at the memory 4 and decided to be the writing defect, are re-written in a lump. Thus, the seek time is omitted and the high speed can be executed. It is unnecessary to provide a writing area for the writing defect for a track and the efficiency of a space is improved.

Description

[Detailed Description of the Invention] [Summary] The present invention uses a spiral additional recording type optical disk control system to store data in a buffer memory when a write failure occurs, and write a series of data to multiple tracks. m, and when the series of writing is completed, the data with write failures stored in the buffer memory is rewritten all at once.

This makes it possible to perform data writing processing quickly and efficiently.

[Industrial application field]

The present invention relates to an optical disk control method for a spiral additional recording type optical disk at the time of writing failure.

Optical disks have a large capacity storage medium compared to magnetic disks, etc., but are characterized by considerably low data quality due to the error rate of the medium.

However, when using optical discs as external storage devices,
Naturally, data reliability is required. In order to ensure the reliability of this data, data is written to each track using a method similar to a magnetic disk, and error data is checked before writing to the alternate memory area. Due to the error rate, writing to the alternate memory area is Since the number of accesses increases and the write processing efficiency decreases, a control system specific to optical disks is required.

[Conventional technology]

FIG. 8 is an explanatory diagram of a conventional writing method.

The tracks of the optical disk form concentric circles, and the tracks are divided into sectors O to m, and the last sector m is followed by sector 0 of the same track. Furthermore, the inside of the track is classified into a data sector 40 and a replacement sector 41 for writing in the event of a writing failure. Normally, data is written to the data sector 40, but if a write failure is determined, the data is written to the alternate sector 41. If the number of sectors determined to be write-defective exceeds the number of alternate sectors 41 in that track, those data are written on another track called an alternate track 42.

The number of alternate sectors in a track is determined based on the error rate of the optical disk medium, etc., but it is not possible to secure a sufficient number from the perspective of space efficiency, and due to variations in the occurrence of write failures, it is necessary to rewrite to the alternate track. Data that must be processed is generated.

[Problem that the invention seeks to solve]

In conventional concentric optical discs with additional recording, a certain number of alternate sectors are provided for each track, but since the occurrence of write failures varies depending on each track, the alternate sector overflows in some tracks and the alternate track is replaced. In some cases, data may be rewritten to another track, and in some cases, a replacement track may remain completely unused.

When the alternate sector overflows and data is rewritten on the alternate track, additional seek time is required to access the alternate track, resulting in a slow speed. Furthermore, if the replacement track remains unused, space efficiency will deteriorate.

The present invention is intended to solve the above-mentioned problems, and it is an object of the present invention to provide an optical disk control method that can improve space efficiency and speed up write processing.

[Means for solving problems]

FIG. 1 is a block diagram for explaining the principle of the present invention. In order to achieve the above object, the optical disk control system of the present invention includes a writing mechanism 2 that records and reproduces data in a spiral manner on the optical disk 1, and a writing mechanism 2 that simultaneously reads and determines the quality of the writing state when writing data. Judgment mechanism 3;
If the written data is determined to be defective, a buffer memory 4 is provided to retain the data, and when writing multiple tracks, the data determined to be defective is retained in the buffer memory 4 while a series of data is stored. This is an optical disk control method in which data is written in succession, and after the series of data writing is completed, the data held in the buffer memory and determined to be defective in writing is rewritten all at once.

[Effect]

The present invention eliminates the need for seeking between tracks when recording data in a spiral manner on the optical disk 1 and continuously records the data, and also reads the written data immediately after writing, determines a writing failure, and performs writing. By retaining defective data in the buffer memory 4, it becomes possible to continuously write a series of data to a plurality of tracks. After this series of data writes, by collectively writing the data that resulted in write failures to alternate tracks in the subsequent spiral structure, seek time can be omitted and writing speed can be increased, and write failures for each track can be avoided. This eliminates the need for a writing area, increasing space efficiency.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 2 is a block diagram of an embodiment to which the present invention is applied.

First, its configuration will be explained. The optical disk head 5 for writing and reading the optical disk 1 is composed of a writing section 5a and a reading section 5b, as will be described later. The writing mechanism 2 is composed of the writing section 5a, a data transfer control circuit 6, a data bus sofa memory 4, a writing control circuit 7, and the like. Normally, write data from a higher-level device such as a computer is sequentially stored in a predetermined location in the data buffer memory 4 by a data transfer control circuit 6, and sequentially read out by a write control circuit 7 asynchronously with the data transfer control circuit 6 in bit serial format. The data is converted, formatted, and written onto the optical disc 1 via the writing section 5a of the optical disc head 5 in a spiral manner, which will be described later.

Check the quality of the written data on the optical disk 1 written by the writing unit 5a at the same time as writing (to be exact, immediately after writing)
The determination mechanism 3 that determines whether or not the data is written is composed of a writing section 5b, a read control circuit 8, a determination circuit 9, and the like. The read signal from the writing section 5b is bit serial, and the read control circuit 8 converts it into parallel and passes it to the determination circuit 9. Judgment circuit 9
receives write data from the write control circuit 7, holds it, and compares it with the same data from the read control circuit 8 to determine a match. If there is a mismatch, it can be determined that there is a write failure, and the data buffer memory 4 is notified of the write failure, and if it fails, the write failure is notified.

In this embodiment, the data buffer memory 4 also serves as the buffer memory for holding write-defective data.

Therefore, the data buffer memory 4 is configured to be able to store a write failure flag 4a and an in-use flag 4b for each sector data, for example. The flags 4a and 4b may be added to part of the data, or may be stored in independent memory areas. During use, the SORAG 4b is connected to the data transfer control circuit 6.
It is set when data is written by, and is reset by the notification of normal writing from the determination circuit 9. The write failure flag 4a is set by a write failure notification from the determination circuit 9, and when the write control circuit 7 detects the end of writing a series of data to multiple track blocks, it picks up the data block with this write failure flag and finally reads the data block. Data is rewritten to the primary alternate track of the optical disc 1, which will be described later. At this time as well, write quality is determined in the same manner as described above, and if normal, the write failure flag 4a and in-use flag 4b are reset. If there is a write failure again, the judgment circuit 9 will be set to write mode? An instruction is given to the iU circuit 7 to seek the secondary alternate track and write until it becomes normal, for example. Data transfer control circuit 6
repeatedly checks the in-use flag 4b from the beginning and writes to the reset location. 4c and 4d indicate address decoders at each access.

FIG. 3 is a schematic configuration diagram of an optical disk head.

The optical disk head 5 includes an information writing laser diode 10 that emits light in response to a bit-serial write drive signal from the write control circuit, and a lens 11 that focuses the laser diode and irradiates a spot onto the rotating optical disk 1. An information reading laser diode 12 that constantly emits light for reading, and an optical disc 1 illuminated by the diode 12
a lens 13 that collects the reflected light from the lens 13, and a half mirror that reflects the collected light laterally and enters the laser detector 14.
15, and a carriage 16 on which the above is mounted and fixed and movable in the radial direction of the optical disc 1. The trolley 16 is capable of a seek operation by the aforementioned write control circuit and a drive mechanism (not shown). The laser detector 14 converts the incident laser light into an electrical signal and obtains a bit-serial read signal.

The information reading diode 12 is arranged to be able to read the tracks recorded by the information writing diode 10 at predetermined bit intervals.

FIG. 4 is a diagram showing an example of the track configuration of the optical disc in the above embodiment. The present invention records data in a spiral (thinly wound) manner on an optical disk, but for convenience, the circumference is managed as a track in the same way as a conventional concentric optical disk. One track is divided into sectors 0 to m, and since recording is performed in a spiral manner, the last sector m of track n is followed by sector O of track n+l. Data is continuously written in areas of multiple tracks 31 at once. Even if a writing failure occurs at this time, the data is temporarily held and writing to the data track 31 continues. After this series of writing is completed, the temporarily held data is written to the temporary replacement trunk 32. This speeds up the write process and also makes the use of alternate trunks more space efficient. - The number of next alternate trunks is preferably 16 blocks when the number of data tracks is 256 blocks. If the second replacement track 31 overflows, the second replacement trunk 33 is sought and written. Since this secondary alternate track 33 is used infrequently, the influence of seek time on writing is small.

The operation of the embodiment configured as described above will be explained using a flowchart. FIG. 5 is a flowchart when writing to the data buffer memory.

First, it is determined whether or not the address of the data buffer memory to be written is in use by checking the in-use flag, and if it is in use, the process advances to the next data buffer memory address. If the data buffer memory is not in use, the data is transferred to an empty area of the data buffer memory, and an in-use flag is set for each block that has been transferred. In this way, data is transferred sequentially, and when the transfer to the last data buffer memory address is completed, data is transferred again in the same manner from the beginning. The series of data transfers is completed either by the write control circuit counting a certain number of blocks in response to instructions from the data transfer control circuit, or by writing the final data information into the data buffer memory as part of the data or as a flag. It can be determined by reading this.

FIG. 6 is a flowchart when reading data from the data buffer memory. First, the initial address of the buffer memory to be read is set. The initial address may be set from the data transfer control circuit to the write control circuit, or the next data address containing the final data information may be set as the initial address. Next, data is transferred and written from the data buffer memory to the optical disk. After writing, it is determined whether the writing was successful or not, and if the writing was successful, the corresponding in-use flag is reset. If writing is abnormal, set the write failure flag and do not set the busy flag. In this way, a series of data is transferred in sequence, and the transfer of all blocks is completed.

FIG. 7 is a flowchart when writing defective data to the primary alternate track. After the transfer (write) of all block data from the data buffer memory is completed (end), check the write failure flag from the initial address, and if the flag is set, start the transfer and write to consecutive primary alternate tracks. Write defective data with track address and sector address. If there is no write failure flag, move to the next address. If there is a write defect flag and the transfer is completed, it is determined whether the write is normal or not in the same way as normal writing, and if it is normal, the write defect flag and in-use flag are reset, and if it is defective, the secondary replacement memory is reset. Perform processing such as seeking and writing until normal. The above steps are performed for all addresses in the data buffer memory.

Note that the present invention is not limited to the above-mentioned embodiments (it is possible to take various applications and embodiments in accordance with the gist of the present invention. For example, it is natural that a buffer memory for bad data may be provided independently. .

〔Effect of the invention〕

As is clear from the above description, the optical disc control method of the present invention records data in a spiral manner on the optical disc, so compared to a concentric optical disc, the optical disc control method of the present invention has a higher speed than a concentric optical disc. is no longer necessary, so
Ability to speed up writing and reading. In addition, by retaining the data that caused a writing failure in the buffer memory and then rewriting it all at once, continuous writing is possible without temporarily interrupting writing even if a writing failure occurs. . Furthermore, compared to a concentric optical disk, there is no need to reserve alternate sectors for rewriting for each track, so space efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a schematic configuration diagram of an optical disk head, and FIG. 4 is a track diagram of the optical disk of the present invention. 5 is a flowchart when writing to the data buffer memory, FIG. 6 is a flowchart when reading from the data buffer memory, FIG. 7 is a flowchart when reading defective data, and FIG. 8 is a conventional writing method. FIG. 2 is an explanatory diagram of the method. In the figure, 1... optical disc 2... writing mechanism 3...
- Determination mechanism 4: Buffer memory (data buffer memory). -4 Ki, Agent Patent Attorney Sada Igata -゛-uma]:・9te°
Figure 3 of the photon disk of the present invention 11. Example to the groove of take buffer memory @ 70-chart at the time of follow-up Fig. 5 Temperature bar soft finish 711 people advance fortune telling flow + dirt Fig. 6 Incense defective data read B temple flow chart Figure 7. Reasons for the 1-include a method of Seiki Edamaki Tee Figure 8

Claims (1)

[Scope of Claims] A writing mechanism (2) that records and reproduces data in a spiral manner on an optical disk (1), and a determination mechanism (3) that simultaneously reads and determines whether the writing state is good or bad when writing data. , and a buffer memory (4) that holds the written data if it is determined to be defective, and when writing multiple tracks, the buffer memory (4) retains the data determined to be defective. , an optical disk control characterized in that a series of data is continuously written, and after the series of data writing is completed, the data held in the buffer memory (4) that is determined to be a write failure is rewritten all at once. method.