JPH0223576A - Data recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the fruitless use of a recording area by writing synchronizing signals and address information in an n-time superposed state at every pre-format section and at the same time, additionally recording number information indicating the order of the synchronizing signals in the same pre-format section. CONSTITUTION:The rotation of a disk 1 is controlled by a control section 3 and clocks from a rotation detecting section 4 indicating the rotating state of the disk 1 are counted by means of a counter 5. The data of the counter 5 are sent to a pre-formatter 6 and the pre-formatter 6 produces synchronizing signals SYNC and identification code ID (n) times and at the same time, outputs the number of synchronizing signal writing times to a modulator 7 when the pre-formatter 6 produces pre-format data based on the data of the counter 5. Then the pre-format data are modulated by a prescribed modulation system and stored on the disk. Therefore, the position of recording and reproduced data is accurately found from the synchronizing signals SYNC and fruitless use of a data recording area can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device, such as a magneto-optical disk recording and reproducing device, that records and reproduces data on a recording medium on which synchronization signals, addresses, identification codes, etc. are preformatted. In particular, the present invention relates to an improvement in an apparatus for preformatting the preformat.

[Conventional technology]

FIG. 4 is a block diagram of a part in a conventional data recording/reproducing device that performs original recording and reproducing. In the figure, 31 is a preformat section reproducing circuit, 32 is a formatter that performs original recording data formatting, 33 is a circuit that extracts only actual data from reproduced data, and 34 is a RAM.

FIG. 5 is a diagram showing a block configuration of a preformat section reproducing circuit 31 of a conventional data recording/reproducing device.
11 is a demodulation circuit, 12 is a synchronization signal (SYNC) detection circuit, 14 is a timing generation circuit for generating data recording/reproduction timing, and 15 is a data address part extraction circuit.

Further, FIG. 6 shows an example of a data recording format of a conventional data recording/reproducing device, and FIG. 1 shows a block configuration of a preformat recording device that preformats a recording medium to enable such recording. ing.

Since the device shown in FIG. 1 is similar in block configuration to that of the present invention, the prior art will also be explained using FIG. 1.

In the figure, 1 is a magneto-optical disk (recording medium), 2 is a motor, 3 is a control unit that controls the rotation of the motor, 4 is a rotation detection unit that detects the rotation state of the motor, 5 is a counter, and 6
7 is a preformat that creates preformat data using this count data, and 7 is a modulator.

Next, the operation will be explained. First, a magneto-optical disk to be preformatted is loaded into a disk drive and rotated by the motor 2 at a predetermined number of rotations. The rotation of the disk 1 is controlled by a control section 3, and a counter 5 counts signal clock signals indicating the rotational state from a rotation detection section 4, and sends the data to a pre-format. The preformat 6 creates preformat data based on the sent data and outputs it to the modulator 7. As a result, the preformat data is modulated using a predetermined modulation method and recorded on the disc.

Next, when recording and reproducing original data, the circuit shown in FIG. 4 performs recording and reproducing. First, when recording, switch 35 in Figure 4
is placed on the side of the preformat section reproduction circuit 31, and the reproduction data reproduced from the disk is input to the preformat section reproduction circuit 31. The preformat section reproducing circuit 31 selects 5YNC from the reproduced preformat data.
is detected by the 5YNC detection circuit 12 in FIG. 5, and based on this, the timing generation circuit 14 determines the data recording position and outputs a timing clock. It also extracts address data from the preformat data and outputs it.

According to the information, the actual data to be recorded is outputted from the RAM 34, formatted into a recording format (FIG. 6) by the formatter 32, and outputted.

On the other hand, during reproduction, the preformat section reproducing circuit 31 reproduces the preformat section and outputs a timing clock and an address in the same way as during recording. Next, by changing the switch, the data part excluding the preformat part is sent to the data extraction circuit 33, and only the actual data is extracted by the data extraction circuit 33. According to the address information, the RA
It is input to the M34th. Then, reproduction data is extracted from R to A4 as necessary.

In addition, in the preformat shown in Fig. 6, 5YNC
The identification code ID is written in triplicate to prevent detection errors due to missing data or errors.

[Problem to be solved by the invention]

Since the conventional data recording and reproducing device is configured as described above, it is possible to determine the data recording position from the preformat section, and by triple writing 5YNC and ID, it is possible to determine the data recording position from the preformat section.
Although it prevents errors in detecting 5YNC and addresses, it is not known what number the 5YNC or address actually detected is, so errors occur in positioning the recording/playback data, and this error is absorbed. It is necessary to create a gap between
There were problems such as a lot of wasted recording area.

This invention was made in order to solve the above-mentioned problems of the conventional ones, and it causes almost no error in determining the position of recording/playback data, so it is possible to reduce the gap area. It is an object of the present invention to provide a data recording/reproducing device that can reduce waste of recording area.

[Means to solve the problem]

The data recording/reproducing device according to the present invention not only overwrites 5YNC and ID:fin for each preformat section, but also adds number information indicating the data number of the 5YNC in the same preformat section. It is configured so that it can be recorded.

[Effect]

In this invention, since it is known what number the detected 5YNC'PID is, an accurate recording/reproducing position can be determined based on it.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing the internal configuration of a preformat device of a data recording and reproducing device according to an embodiment of the present invention.
This is similar to the preformat device of a conventional data recording/reproducing device, but the function of the formatter 6 is different from that of the conventional device.

In addition, although the block configuration of the part that performs original recording and reproduction in this embodiment is the same as the conventional one shown in FIG. 4, the internal configuration of the preformat section reproducing circuit 31 is slightly different from the conventional one. are doing.

FIG. 2 is a block diagram showing the internal configuration of the preformat section reproduction circuit 31 in an embodiment of the present invention. In the figure, 11 is a demodulation circuit, 12 is a 5YNC detection circuit,
13 is a 5YNC number extraction circuit, 14 is a data recording/reproduction timing generation circuit, and 15 is a data address section extraction circuit.

FIG. 3 shows an example of a data recording format of a data recording/reproducing device according to an embodiment of the present invention. During preformatting, 5YNC is written with the original 5YNC pattern and the number of holes in which the 5YNC pattern is written. The 5YNC number shown is written.

Next, the operation will be explained using FIGS. 1 to 4. First, a magneto-optical disk to be preformatted is loaded into a disk drive and rotated by the motor 2 at a predetermined number of rotations. The rotation of the disk l is controlled by a control section 3, and a counter 5 counts signal clocks indicating its rotational state from a rotation detection section 4, and sends the data to a preformatter 6. The BRIFOMATSUTA 6 creates preformat data based on the sent data, but at this time, it adds synchronization signals, identification codes, etc. so that it is written n times in the same preformat data as in the past. In addition to creating the synchronization signal once, a number indicating how many times the synchronization signal has been written is also created and these are output to the modulator 7. As a result, the preformatted data is modulated using a predetermined modulation method,
recorded on the disc.

Next, during original recording, first the preformat playback circuit 3
1, convert 5YNC from preformat data to 5
The YNC detection circuit 12 detects the 5YNC number, and the 5YNC number extraction circuit 13 extracts the 5YNC number. Based on the 5YNC number extraction circuit 13, the timing generation circuit 14 accurately determines the data recording position and outputs a timing clock. It also extracts address data from the preformat section and outputs it. According to the information, the actual data to be recorded is output from the RA and M34, and the formatter 32 outputs the actual data to be recorded.
(Figure) and output.

Furthermore, during original reproduction, the preformat section reproducing circuit 31 reproduces the preformat section and outputs a timing clock and an address in the same manner as during original recording. Further, the data portion excluding the preformat portion is sent to the data extraction circuit 33, where only the actual data is extracted and input to the RAM 34 according to the address information. The reproduced data is then retrieved from the RAM 34 as necessary.

Here, in the preformat of Fig. 3, 5YN
C and 10 are written in triplicate, which can prevent detection errors due to missing data or errors, but in this example, the 5YNC pattern is 14 bits, the number is 2 bits, and the 14-bit After detecting the 5YNC, it is possible to recognize the number of the 5YNC.

Therefore, the position of the data to be recorded and reproduced can be accurately determined from the detected 5YNC, and the gap for absorbing the error can also be made smaller, which has the effect of reducing wastage of the data recording area.

Although not specifically described in the above embodiment, an encoder and a decoder for encoding and decoding data error correction may be connected to the RAM 34. Furthermore, the number of times the 5YNC and ID are written may be arbitrary, and the number of bits of the 5YNC pattern and number, the number of bytes of other data, the sector capacity, etc. may also be arbitrary.

Furthermore, the detection of 5YNC and 5YNC numbers may be performed either before or after data demodulation, and the above embodiment shows a case in which preformatting and original recording/reproduction are performed using the same device. However, only preformatting may be performed by a separate device.

Further, in the above embodiment, only a magneto-optical disk recording/reproducing apparatus has been described, but the present invention can be similarly applied to any digital data recording/reproducing apparatus that preformats a recording medium, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the data recording and reproducing apparatus according to the present invention, a synchronization signal is written n times in the preformat, and a number indicating how many times the synchronization signal has been written is also recorded. , the position of the data to be recorded and played back can be determined accurately from the detected synchronization signal, and the gap for absorbing the error can also be made smaller.
This has the effect of reducing waste of data recording area.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a preformat device for a data recording/reproducing device according to a conventional method and an embodiment of the present invention, and FIG.
3 is a block diagram of a preformat section reproducing circuit of a data recording/reproducing apparatus according to an embodiment of the present invention; FIG. 3 is a diagram showing an example of a data recording format of the data recording/reproducing apparatus according to an embodiment of the present invention; FIG. 4 is a block diagram of a conventional data recording and reproducing device according to an embodiment of the present invention, FIG. 5 is a block diagram of a preformat section reproducing circuit of the conventional data recording and reproducing device, and FIG. 6 is a block diagram of a conventional data recording and reproducing device. FIG. 2 is a diagram showing an example of a data recording format of FIG. In the figure, 1 is a magneto-optical disk, 2 is a motor, 3 is a control unit, 4 is a rotation detection unit, 5 is a counter, 6 is a preformat, 7 is a converter, 31 is a preformat part reproducing circuit, and 12 is a 5YNC detection circuit, 13 a 5YNC number extraction circuit, 14 a timing generation circuit, and 15 an address extraction circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A device for recording and reproducing digital data, on a recording medium on which preformat information such as a synchronization signal, address, and identification code is recorded in advance.
In a device that records and plays original digital data using preformat information, when recording preformat information, a synchronization signal and address information are recorded multiple times for each preformat information, and the synchronization signal is also recorded with the same preformat information. 1. A data recording/reproducing device characterized in that a number indicating how many times the information has been recorded is also recorded.