JPS63195877A - Data recording and reproducing system - Google Patents

Abstract

PURPOSE:To make data recording efficient by rerecording data having errors more than a reference value in a recording medium after completing the recording of a series of data. CONSTITUTION:Recording data outputted from a host computer 2 are inputted to a driving device 1 through an adaptor 3 and recorded in an optical disk 21. After ending the recording of data for one sector, the data are verified and checked and its error is checked by an error correcting circuit 17. When the error exceeds the reference value, data stored in a buffer memory 32 are transferred and recorded to/in an external memory 33 without executing retrying operation. After ending the recording of a series of data, the data stored in the memory 33 are stored in a buffer memory 14, rerecorded in an optical disk 21 and verified and read out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data recording and reproducing method suitable for use when recording and reproducing data on a recording medium such as an optical disk.

[Summary of the invention]

In the present invention, data recorded on a recording medium is verified read, and if the error is equal to or greater than a reference value, the data is re-recorded after a series of data recording is completed.

[Conventional technology]

For example, information is recorded on an optical disc as follows. Write data transferred from the host computer is temporarily stored in the buffer memory.

The stored data is subjected to predetermined processing and then recorded on an optical disc. The recorded data is verified read from the optical disc (reading is performed for confirmation).
, demodulation, error correction, etc. are performed. When the error is less than the reference value, the next data is recorded. When the error is greater than or equal to the reference value, the data is re-recorded sector by sector at another address (sector) on the optical disc. The re-recorded data is verified and read again to check for errors. When the data is correctly recorded by such a re-recording (retry) operation, the next data is recorded. If correct data cannot be recorded even after repeating the retry operation a predetermined number of times, predetermined error handling is performed.

[Problem that the invention seeks to solve]

As described above, in the conventional system, the next data is recorded after a series of operations such as data transfer (writing) to the buffer memory → modulation, recording → verify read → retry → verify read → OK. Therefore, the time required for such a series of operations and the buffer memory capacity (1
Continuously input data cannot be recorded unless the write rate, which is determined by the amount of data that can be written at one time, is set to be higher than the input data rate. Since defects in optical discs, that is, the number of retries cannot be predicted, it is necessary to set the allowable number of retries to a certain degree.

However, if you set the rate so that the input data does not overflow even if you repeat the retries up to five times, there is no need to retry in normal cases, so you will not be able to set the data rate high after all. There are drawbacks.

The present invention was made in view of this situation, and it is an object of the present invention to enable data to be recorded more efficiently.

[Means for solving problems]

In a data recording and reproducing method, the present invention stores data to be recorded in a first memory, stores data stored in the first memory in a second memory, and stores data stored in the second memory. The data recorded on the recording medium is read out, and when the data error is less than a predetermined reference value, the next data is sequentially recorded, and when the data error is greater than or equal to the reference value, the data is read out. After the data is stored in the third memory, the next data is sequentially recorded, and after the series of data has been recorded on the recording medium, the data stored in the third memory is re-recorded on the recording medium. do.

[Effect]

The data to be recorded is first sequentially stored in the first memory. The data once stored in the first memory is transferred to and stored in the second memory, and the data stored in the second memory is recorded on the recording medium.

Data recorded on a recording medium is read immediately after recording and checked for errors. When the error is less than the reference value, the next data is recorded in sequence. When the error is greater than or equal to the reference value, the data is temporarily stored in the third memory. Then, the next data is recorded sequentially. After the recording of a series of data is completed, the data stored in the third memory is recorded on the recording medium again.

〔Example〕

FIG. 1 is a book diagram when the present invention is applied to an optical disk device. Reference numeral 1 denotes a drive device, into which recording data output from the host computer 2 is inputted via an adapter 3 (of course, the adapter 3 can be substantially built into the drive device 1).

Adapter 3 has interface 31 and buffer memory 3
2 and an external memory 33. Data output from the host computer 2 is temporarily stored in a buffer memory 32 via an interface 31. When a predetermined amount of data (for example, one sector) is stored in the buffer memory 32, the data is controlled by the main controller 11 or the DMA (direct memory access) controller 15 and transferred to the buffer memory 14 built in the drive device 1. , will be remembered. The data stored in the buffer memory 14 is controlled by the main controller 11 and input to the error correction circuit 17 via the interface 16. The sub-controller 12 controls the error correction circuit 17 and the modulation/demodulation circuit 18, and performs interleaving,
Modulates data that has undergone processing such as adding error correction codes,
Output. The signal output from the modulation/demodulation circuit 18 is input to an RF signal processing circuit 19 controlled by the sub-controller 13. The RF multiplied signal output from the RF signal processing circuit 19 is sent to the optical disk 2 via an optical pickup (not shown) built in the servo control circuit 20.
recorded on 1.

For example, when recording of data for one sector is completed, this data is immediately verified read from the optical disc 21. The read data is sent to the servo control circuit 2
0 is input to the modulation/demodulation circuit 18 via the RF signal processing circuit 19 and demodulated.

Further, an error correction circuit 17 performs error checking. When the error is less than the reference value (for example, when there is no error), directory information such as the block number and address of the recorded data is recorded at a predetermined position on the optical disc 21. Furthermore, the next data is sequentially stored in the buffer memory 32.14, and the same operation as described above is repeated.

When the error is greater than the reference value (for example, when there is an error), no retry is performed, and the data stored in the buffer memory 32 is transferred and stored in an external memory 33 such as a hard disk or floppy disk.

This operation is repeated until a series of continuous data is completed.

When the series of data is completed, the data stored in the external memory 33 is transferred to and stored in the buffer memory 32, and further transferred from the buffer memory 32 to the buffer memory 14 and stored.

The data stored in the buffer memory 14 is recorded (re-recorded) on the optical disc 21 in the same manner as described above, and immediately verified and read. When the error as a result of the verify read is less than the reference value, directory information such as the block number, address, and flag indicating re-recording of the data is recorded at a predetermined position on the optical disc 21. As a result, by referring to the directory information, it becomes possible to sequentially read data from the first recording and the second and subsequent recordings in a predetermined order.

If the error is greater than or equal to a reference value, a further retry is performed when the number of retries is less than a predetermined reference value N;
When it is equal to or greater than the reference value N, predetermined error processing is performed.

The above operations are performed for all data stored in the external memory 33.

The above operation is shown in a flowchart as shown in FIG.

Although only one buffer memory 32 is shown in FIG. 1, for example, a pair of buffer memories 32 are provided as shown in FIG. 2, so that when data is being read from one, the next data is written to the other. Data can be input continuously from the host computer 2.

〔effect〕

As described above, the present invention provides a data recording/reproduction method in which data to be recorded is stored in a first memory, data stored in the first memory is stored in a second memory, and data to be recorded is stored in a second memory. The recorded data is recorded on the recording medium, and the data recorded on the recording medium is read out.
is less than a predetermined reference value, the next data is recorded sequentially, and when the error in the data is greater than or equal to the reference value, the data is stored in the third memory and then the next data is sequentially recorded. After the recording to the recording medium is completed, the third
Since the data stored in the memory of the memory is re-recorded on the recording medium, continuous data can be recorded without allowing for retry operation time due to defects in the recording medium, etc., and the rate of input data can be increased. can do. Therefore, it is particularly effective in cases where continuity must be maintained, such as in live recording of audio data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the optical disk device of the present invention, FIG. 2 is a block diagram of its buffer memory, and FIG. 3 is its flowchart. 1... Drive device 2... Host computer 3... Adapter 11... Main controller 12.13... Sub controller 14... Buffer memory 15... DMA controller 16... Interface 17. ...Error correction circuit 18...Modulation/demodulation circuit 19...RF signal processing circuit 20...Servo control circuit 21...Optical disk 31...Interface 32.32a, 32b...Buffer memory 33...
More than external memory

Claims (1)

[Claims] Storing data to be recorded in a first memory, storing the data stored in the first memory in a second memory, and recording the data stored in the second memory on a recording medium. , reading the data recorded on the recording medium;
When the error in the data is less than a predetermined reference value, the next data is sequentially recorded, and when the error in the data is greater than or equal to the reference value, the data is stored in the third memory and then the next data is recorded. A data recording and reproducing method characterized in that data is sequentially recorded, and after the series of data has been recorded on the recording medium, the data stored in the third memory is re-recorded on the recording medium. .