JPS6391852A - Information recording method - Google Patents

Abstract

PURPOSE:To record roughly in a real time a large quantity of information which is transferred continuously at a high speed from the outside, by ending an erasion of the information, before a position where write of the information is started, or before it comes onto the same radius as this position. CONSTITUTION:When information from a host side is received, a magneto- optical head 504 is brought to an access to a write start position 102 and an erasing operation is started. An end position of the erasion is set to a position 103 where a rotation waiting time for starting write from the position 102 in the next time can secure the time for switching the operation from the erasing operation to the write operation, and executing the operation of a preparation for a track jump, etc. Subsequently, the head 504 returns to the position 102 again by the track jump, information 608 which desires to execute newly recording is accumulated in a storage buffer 602 or 603, and if a preparation for write is completed already, information is written in order from the position 102 through a modulating circuit 605 and an erasion/write control part 607.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Application in M Business) The present invention relates to an information recording method for recording information on a rewritable disk.

(Prior Art) In recent years, research has been actively conducted on optical disk memory devices using laser light as high-density, large-capacity information storage devices. Among these, magneto-optical disk memory devices that are capable of recording, reproducing, and erasing information are attracting particular attention, and there is an urgent need to put them into practical use.

The principle of this method of recording information signals on a magneto-optical disk will be explained. The recording medium on the disk is magnetized in advance in one direction perpendicular to the surface of the disk. During recording, a desired recording area is irradiated with a laser beam to locally raise the temperature of the recording medium and reduce the coercive force of the medium in that area. At this time, by applying a bias magnetic field of a predetermined magnitude in the opposite direction to the previously magnetized direction, recording is performed by reversing the magnetization of the recording part of the medium. The direction of the bias magnetic field is reversed.

By irradiating the medium with laser light, the direction of magnetization of the medium is returned to its original direction. In addition, for reproduction, a magneto-optical disk is irradiated with a linearly polarized laser beam, and the polarization direction of the reflected light (or transmitted light) of this laser beam is different between the part where the magnetization has been reversed and the part where the magnetization has not been reversed. This is done using magnetic effects.

However, when rewriting is performed using a magneto-optical disk like the one described in ``2,'' unlike a magnetic disk, overwriting cannot be performed, and even if information is directly overwritten in an area where information has already been recorded, the original old The magnetization reversed during recording remains without being erased. For this reason, conventionally, when rewriting information, a method has been used in which the old information is erased, the direction of magnetization is aligned with the original direction, and then writing of new information is started.

A conventional example of this method will be explained using FIG. 8.

FIG. 8 is a diagram showing the state of the recording area when information on the magneto-optical disk 801 is rewritten by a conventional device. It is assumed that recording is performed so that a spiral recording string is formed on the disk. Also, for the sake of clarity, the disk is shown fixed and the access position of the magneto-optical head rotates relative to it. The access position of the head moves clockwise in the figure, and recording progresses from the inner circumference to the outer circumference of the disk. The figure shows an erase-write sequence in the basic recording operation. When the area to be recorded is known, the magneto-optical head accesses the starting position 802 of the basic recording operation. This starting position 802 is located on the radial direction of the disk 801 indicated by a dotted line in the figure. Then, an erasing operation is performed for the first approximately one rotation of the disk, and information up to position 803 on the track is erased. Next, the access position of the head moves to one inner track by a track jump and returns to position 802 again. Here, it is checked whether the information desired to be recorded on the first track has been accumulated in the storage buffer and preparation for writing is completed, and if it is completed, the information is written sequentially from position 802 to position 803. .

On the other hand, if the write preparation is not completed, it waits while accessing the same track in a state of idle feeding by track jump until the write preparation is completed, and when the write preparation is completed, the above-mentioned write is performed.

In this way, by quickly and repeatedly erasing a certain area of the disk and recording to that area.

Information that is continuously transferred from the outside can be recorded in approximately real time.

By the way, in this operation, the pickup leaves the recording column from position 803 to position 802 where the track jump is performed, and erasing/recording is not performed. In a device in which such a track jump is performed once per disk rotation at the same angular position of the disk, the starting point of the next recording operation subsequent to the previous recording operation is position 804, which is one track outside position 802. . However, in this case, the area from position 803 to position 804 becomes an area where nothing is recorded as a gap for securing time for the track jump, and the capacity of the entire disc is not effectively utilized.

Possible ways to solve this problem are: ■
This method uses the end point 803 of the write operation as the start position of the next basic recording operation. In this way, it is possible to prevent unnecessary areas from being generated.

To do this, it is necessary to write to the end position 803 and then erase from the area immediately after that. However, if you change the direction of the bias magnetic field,
Alternatively, since a finite amount of time is required for switching operations such as adjusting the output of the laser beam to a value suitable for erasing, the record actually begins to be erased at position 805, which is a finite distance past point vi 803. From position 803 to [
The area up to 805 is not erased correctly. Therefore, in this case as well, it is necessary to provide a corresponding gap at least from position 803 to position Fl1805.

Since switching between erase and write operations and moving between tracks requires a finite amount of time, large gaps are created on the disk to ensure enough time for these operations. Measures need to be taken, such as preventing recording. However, this method of providing a gap does not make effective use of the recording surface at all, and has drawbacks such as the storage capacity per disc being significantly reduced by the gap.

Further, as a method for securing the above-mentioned time margin without providing such a gap, it is also possible to perform an operation of waiting for one rotation of the disk when switching between the erasing operation and the writing operation. FIG. 9 is a diagram showing the state of the recording area when information on the magneto-optical disk 901 is rewritten by another conventional device. In the figure, position 902 is the start position of the recording operation. In the device of this example, when the erase operation is started from position 902, the first erase operation is performed targeting the area up to position 903, which is one track outside in the same radial direction. . Next, track jump, switch between erase operation and write operation, wait for one revolution of the disk, and then move to 1st position 90.
2 to position 903. Next, the operation mode is switched from the write operation to the erase operation by a track jump, and when the position 903 is accessed again after waiting one rotation, the position 903 is changed to the next erase operation in the same way as above.
Furthermore, it can be used as a starting point for a write operation, and recording can be performed repeatedly. According to this method, there is no need to provide a gap portion as described above, and the recording surface on the disk is effectively used, and recording is performed without creating any unnecessary unrecorded portions. However, each time when switching between an erasing operation and a writing operation, a long period of time nearly equal to one rotation of the disk is used as a rotation waiting time, so that it is unable to react when information is transferred at a high speed.

In particular, when recording signals such as music or video as information, this information is sequentially transferred from the outside at a constant transfer rate over a long period of time, so it can be erased almost in real time.
If the writing process is not performed, there will be an extremely inconvenient situation where signals such as music and blood will be cut off.
This means nothing but narrowing the scope of use of magneto-optical disks.

Also, from the user's point of view, even if the user does not input the music information as described above, if the information is input from an external device (for example, a terminal), there will be a waiting time until it is written to the disc, making it extremely inconvenient to use. It becomes a bad thing.

(Problem to be solved by the invention) In other words, as is clear from the above, although it is a magneto-optical disk that has the excellent property of being rewritable, it is possible to maximize the storage capacity of the disk with a single head and Developing a recording method that can handle the information transferred by the optical disk and a mechanism for realizing it are, so to speak, technical issues that must be solved in the field of magneto-optical disks.

[Structure of the invention]

(Means for solving the problem) Using only one head on a rewritable disk,
This is an information recording method that performs recording by erasing old information that has already been written in a predetermined area, and then writing new information in the erased area. Information is erased on concentric tracks. In the case of a spiral track, information writing ends before the device reaches the same radius as the writing start position, and information writing ends before the device starts writing information.
This information recording method is characterized in that it ends before the information erasure end device.

(Function) Time required to switch between erase mode and write mode or head movement! IJ (track jump, etc.)
By securing the necessary time and setting the range of the area to be erased and written to 1'wM2,
Since the inefficient rotational waiting time can be reduced as much as possible, continuously transferred information can be recorded in substantially real time.

(Example) First example Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 5 is a diagram showing a schematic configuration of an information recording apparatus using a magneto-optical disk as a recording medium, which is an apparatus according to an embodiment of the present invention. The new magneto-optical disk 101 is rotationally driven to a predetermined constant angular velocity by a rotary motor 502 connected to a one-rotation motor control section 501 (CAV).

503 is an electromagnet for generating a magnetic field necessary for recording or erasing.

An optical head 504 includes a laser, a photodetector, an optical element, etc., and is used to irradiate laser light onto the disk 101 and perform focusing control, tracking control, signal detection, and the like. Electromagnet 503 and optical head 504
are held in positions facing each other across the disk, and constitute a magneto-optical head 505.

The magneto-optical head is held on a feeding motor 507 connected to a feeding motor control unit 506 and is driven to move to an arbitrary radial position on the magneto-optical disk 101.

The information recording device in this embodiment has functions for recording and reproducing operations, and the execution of the recording/reproducing operations is controlled by an external system. Recording/reproducing operation instruction signals, recording/reproducing track numbers, recording/reproducing information, etc. are transferred between the device control unit 509 and the external system via the interface 508.

Each recording and reproduction operation is executed by a recording operation control section 510 or a reproduction operation control section 511.

FIG. 1 shows a magneto-optical disk 10 created by the apparatus of this embodiment.
10 is a diagram showing the state of the recording area when the information on FIG. 1 is rewritten, and the recording method will be explained with reference to the flow diagram of FIG. 10. It is assumed that recording is performed so that a spiral recording string is formed on the disk. In this embodiment, the disk format is such that the track for one rotation of the disk is divided into N sectors of the same capacity. Adopt what you have. In order to make it easier to understand, the disk is shown fixed and the access position of the magneto-optical head rotates relative to the disk. Head access position is 1
Moving clockwise in the diagram, recording progresses from the inner circumference of the disc to the outer circumference. Since the first sector number is recorded at the beginning of each sector, a method of controlling the recording operation based on the information of the reproduced sector number can be adopted. FIG. 1 shows the erase-write sequence in the operation unit of the recording mode. In the figure, position 102 is the recording start position in recording information on the disc. It is assumed that the basic recording operation is sequentially repeated from this starting position 102.

First, if there is information from the host side (step α)),
The magneto-optical head is accessed to the writing start position 102 (step ①), and the erasing operation is started from this position 102. The end position of erasure 1iff103 is the primary position 10
The rotational wait time from 2 to the start of writing is at least the same as when switching from erasing to writing (
Step (4)), track jump, etc. 1'! ! The position should be such that the time for preparation operations can be secured, and the rotation waiting time will not be longer than necessary. Furthermore, in this embodiment, since rewriting is performed in units of sectors, the position 103 is set to be the end position of the sector.

Specifically, the sectors to be erased are (N-M) sectors from position 102, and M is the minimum integer that can ensure the necessary rotational waiting time from position 103 to position 102. FIG. 1 shows the case where M=1. Next, the access position of the head moves to one inner track by track jump, and returns to position 1.
Return to 02 (step ■).

Here, it is checked whether the information desired to be recorded on the first track has been accumulated in the storage buffer and the preparation for writing is completed (step (6)). If the information is completed, the information is written sequentially from position 102. Perform the action. on the other hand,
If the write preparation is not completed, the same track is accessed in a state of idle feeding by track jump until the write preparation is completed, and the process waits (step ①), and when the write preparation is completed, the above-mentioned write is performed. Here, the end position of the write operation
A position 104 is set at a position before the position 103 so that there is at least enough time to ensure that the operation is switched to the erase operation after the write operation is completed and the erase is actually started.

Furthermore, in this embodiment, since rewriting is performed in units of selectors, the position 104 is set to be the end position of the sector. Specifically, the sectors targeted for writing are (N-M-L) sectors from position 102, and L is the switching time from write operation to erase operation within the rotational waiting time from position 104 to position [103]. is the smallest integer that can be secured. FIG. 1 shows the case where L=1 (step (8)). When recording continues (step (a)), the next basic recording operation involves switching from write operation to erase operation at position 104, but in step (10), the switching requires a finite time. Therefore, the correct erasure is actually performed at position 10.
Starting from 5. This erase operation erases the area up to position @106 (step (11)), and position 106 is set to be M sectors before reaching the starting point 104 of the next write operation in the same radial direction. Switch to the recording mode of the magneto-optical head (step (12)).

By the track jump (step (13)), the write operation is started from position 104 and is performed in an area from position 106 to Ft107, which is L sectors before the position. Thereafter, similar steps (14), (15), and (16) are performed to complete the recording. By setting the target area for each operation in this way, the rotation waiting time can be suppressed to the minimum necessary to ensure time for track jumps, operation switching, etc. Do the same below.

Repeat this action sequentially towards the outer periphery.

Rewrite the necessary information.

FIG. 6 is a block diagram of the recording operation control section (510 in FIG. 5) shown in the j+8 block diagram of the apparatus shown in FIG. 5, and is an implant for realizing the above-described operation. Here, the recording operation control section 5
10 is shown connected only to an electromagnet 503, an optical head 504, and a reproduction operation control section 511 for the sake of explanation. This recording operation control unit 540 has a counter 601
and two storage buffers I, II, 602° 603, storage buffer control section 604, modulation circuit 605, processor 6
06 and an erase/write control section 607. New information signals (608) to be recorded are continuously input to the counter 601 from the host side. Here, this information signal is divided into blocks of information to be written in one write operation according to the format of the disc. This blocking operation means that 6 pieces of information are written in one write operation.
This means that when the counter 601 passes through the counter 01 and the count of the counter 601 reaches a predetermined value, the storage buffer control unit 604 switches the input/output of the storage buffer I and storage buffer H. For example, storage buffer I
While the information stored in 602 is being output to a modulation circuit 605, which will be described later, the other storage buffer 603 is storing information transferred from the outside.

When the amount of information written in one write operation is stored in one of the storage buffers, the storage buffer control unit 604 performs switching control so that the operations of the two buffers are alternated.

To prevent inefficient rotation waiting time as much as possible.

Let the predetermined value of the count of the counter for switching between these two buffers be the amount of information for the (N-M-L) sectors. The sector address is recorded in advance in the first area of each sector, and no recording/erasing is performed in this area, but only reproduction is performed.

In the recording operation, the erase/write control unit 607 controls the electromagnet 503 and the optical head based on the sector address information transferred from the playback operation control unit 511 and the signal indicating the storage buffer status transferred from the storage buffer control unit 604. This is done by controlling the operation of 504. Specifically, first, when it is detected that the optical head has accessed the recording start position on the first track on which new information is to be recorded by a signal from the reproduction operation control unit 511, the first (N
- Perform an erase operation on M) sectors. Next, the information to be newly recorded in the sector is stored in the storage buffer I.
602 or storage buffer II 603'? Based on the signal transferred from the storage buffer control unit 604, it is confirmed whether or not the storage buffer has been stored. If the bodhisattva has not been completed, the recording operation is suspended for one revolution as a waiting time. When the storage is completed, the information in the memory buffer 1602 or the memory buffer 603 is converted by the modulation circuit 605 into No. 4,1 suitable for recording on the disk, and then the electromagnet and optical head are activated via the erase/write control unit 607. and performs a write operation in the target area. processor 60
6 performs judgment, adjustment, etc. of these series of operations. After that, if you want to continue rewriting, switch the operation to erase operation.

Next erasing is started so as to be continuous with the area erased by the previous erasing operation. The writing Zj operation also starts writing immediately after the area where the previous writing was performed, and writes into the area up to L sector before the area erased this time. The same operation is repeated for the subsequent sectors by selecting the area where the rotational waiting time is as short as possible as the target area for erasing/writing.

For ease of explanation, N and L are used in the above embodiment.

All M are integers, but 0≦L for M and L.

If 0≦M, the time margin necessary for switching operations can be secured, and N-L-M is an integer, that is, the number of sectors to be written at one time is an integer, each of them does not need to be an integer.

As explained above, by repeating the erasing and writing operations, recording can be performed sequentially and efficiently.

When the information has been transferred from the outside, that is, at the last time of the above repetition, there is no need to erase more areas than necessary. Although the device may be controlled so as not to perform erasing after the erasing operation has been performed on the data, such control does not impede the spirit of the present invention.

Second Embodiment FIG. 2 is a diagram showing the state of the recording area when information is written on the magneto-optical disk 201 by an apparatus according to another embodiment of the present invention. As in the case of FIG. 1, it is assumed that the recording rows are formed in a spiral shape, and that the disk is fixed and the access position of the magneto-optical head is relatively rotated. The disk format does not have a sector structure. Furthermore, in this embodiment, rotation control is performed so that the recording linear velocity remains approximately constant regardless of the recording radius (CLV).
, in the operation unit of the recording mode as shown in the figure. Figure 3 shows an erase-write sequence. In the figure, a position 202 is the recording start position when recording information on the disc. It is assumed that the basic recording operation is sequentially repeated from this starting position 202. First, the erase operation starts from position [202]. The erase end position II 203 yen ensures that the rotational waiting time until the writing starts from the next position 202 can at least secure the time for switching the operation from the erase operation to the write operation, and performing preparation operations such as track jump. The position is such that the rotation waiting time is not longer than necessary. Next, the access position of the head moves to one track inside by a track jump, and returns to position 202 again. Here, it is checked whether the information desired to be recorded on the first track has been accumulated in the storage buffer and preparation for writing has been completed, and if it has been completed, the information is sequentially written from position 202. On the other hand, if the writing preparation is not completed, it waits while accessing the same track in a state of idle feeding by track jump until it is completed, and when it is completed, the above writing is performed.Here,
The end position 204 of the write operation is.

After the writing operation is completed, the erasing operation is switched so that the position 205 at which erasing actually starts correctly on the disk is at least as far before the 1st position 203 as possible so that there is enough time to ensure that the erasure does not end later than the previous erasing end position 203. do. Next, in the basic operation of recording, erasing actually starts from position 205, and the area up to position 206 is erased.6 position 206 is in the same radial direction as the starting point 204 of the next writing operation, and at least the above-mentioned erasing operation 1! Switching the operation from to writing operation, track jump, etc.
! Position it as close to you as possible to allow time for preparation.

The next write operation starts at position 204 and starts at position [206
Rather, similar to the above, the operation is performed on the area up to the position 207 in front by the time required to switch the operation from writing to erasing. By setting the target area for each operation in this way, the rotation waiting time can be suppressed to the minimum necessary to ensure time for track jumps, operation switching, etc. This operation is repeated successively toward the outer periphery in the same manner, and necessary information is rewritten.

FIG. 7 shows a schematic configuration of a recording operation control section of an apparatus according to another embodiment of the present invention. The overall configuration is the same as that shown in FIG. Here, for the sake of explanation, the recording operation control section 510 includes the electromagnet 503 and the optical head 50.
4. Rotating motor control unit 501 and sending motor control unit 50
It is shown as if it were connected only to 6. The recording operation control section 510 includes a buffer input control section 701, an input address register 702, a storage buffer 703, a modulation circuit 704. Buffer output control section 705. It consists of an output address register 706, a processor 707, and an erase/write control section 708. The capacity of the storage buffer 703 is at least greater than the information capacity of a track corresponding to one rotation of the disk, and this storage buffer is provided with an address.

For example, data 709 transferred from an external system via an interface is transferred to the buffer input control unit 701.
The address numbers are sequentially stored in the memory buffer 703 starting from the lowest address number. On the other hand, information from the buffer input control section 701 is sent to the input address register 702, which indicates the most recently input address. When the accumulated information reaches the capacity of the buffer, the information returns to the location with the smallest address number and is sequentially accessed cyclically. Output from the buffer is performed by a buffer output control unit 705, and the address number where the most recently outputted information was stored is indicated in an output address register 706.

The transferred information passes through the modulation circuit 704 and is recorded on the disk by the operation of the erase/write control section 708.

Buffer output control section 705, erase/write control section 70
The operation timing of 8 is calculated by the processor 707,
controlled. Here, since the speed at which information is output from the external system is faster than the speed at which it is transferred to the storage buffer γ 703, the capacity will not overflow. To explain the operation timing calculation specifically, first, when it is detected that the optical head has accessed the recording start position on the first track where new information is to be recorded by a signal from the rotary motor control unit 501, the first erasure is performed. do,
Next, it is determined whether or not to start writing to the track.6 In the device of this example, the area from the end point of the write operation to the track to the final position that has already been erased is covered by the operation from write to erase. If the minimum amount of information necessary to secure the time required for switching is stored in the storage buffer 703, writing is started. In this judgment, the amount of accumulated information is input address 70.
2 and the information from the output address register 706, and the amount of information sufficient to start writing is calculated by the processor 707 based on the recording radius information sent from the sending motor control unit 506. Calculated. As a result of the comparison of these calculated values, if the storage is insufficient, the recording operation is suspended in units of one rotation and used as a waiting time. When the 7g product is completed, it is converted through a modulation circuit 704 into a signal suitable for recording on a disk, a write operation of about one revolution is performed, and the next track is accessed.

Similarly, for the subsequent tracks, an erasing operation is performed for the first approximately one rotation on each track, and a writing operation is performed after determining that the accumulation of information to be recorded is complete.

Third Embodiment FIG. 3 is a diagram showing the format of a disk 301 used in an apparatus according to a third embodiment of the present invention. The overall configuration of the device is similar to that of the previous embodiment6.
In the apparatus of this example, the disk rotation is controlled by the CLV method described above, but the format is divided into sectors of the same capacity. Therefore, a track corresponding to one rotation of the disk is not necessarily divided into an integral number of sectors,
The number of sectors per revolution changes depending on the radial position. The present invention can also be applied to such cases. Specifically, the erasing operation is started from the starting point 302 of the basic recording operation, and the starting point is at least as long as the time margin required for track jumping and switching the operation from erasing to writing, rather than reaching a point on the same radial direction. Erase up to the previous position.

In the figure, erasing is performed up to position 303, which is also a sector delimiter. Next, after performing a track jump, writing starts at 302, and at a position at least at least the time margin required for switching from writing to erasing operation before reaching the end point 303 of the erasing operation, and in the sector. Write up to position 304, which is the delimiter. Thereafter, following the above erasing, erasing is performed, and erasing and writing are performed so that the next writing starts at position 304, and the same operation is repeated thereafter. This embodiment has features such as a large capacity due to the adoption of the CLV system, and ease of management of recorded information due to the adoption of the sector format.

Also, as described in the description of the first embodiment of the present invention,
The end point of the erasing operation does not necessarily have to be at the end of a sector, but may be in the middle of a sector as long as there is enough time for track jump or operation switching.

Fourth Embodiment FIG. 4 is a diagram showing the format of a disk 401 used in an apparatus according to a fourth embodiment of the present invention. The present invention can also be implemented in an apparatus in which the rotation of the disk is controlled by the CAV method, and by changing the reference frequency of the write signal, the number of pieces of information recorded per unit length of the track is almost constant regardless of the radial position. Examples are possible. The overall structure of the device is similar to that of the previous embodiment. f54
The figure shows an example of a format divided into sectors of the same capacity. Since the amount of information recorded per unit length of a track is constant, sectors 402 on the inner circumference and sectors 403 on the outer circumference have the same length, but the number of sectors per track for one rotation of the disk is greater than that on the outer circumference. becomes larger.

The timing of erasing and writing operations on the disk is the same as in the embodiments described above. However, in the CAV method, in order to keep the amount of information recorded per unit length of the track constant, the amount of information written in one write operation and the transfer speed must be adjusted according to the recording radial position. For this reason e.g. a recording radius between the host computer and the host computer.

It is necessary to adjust these by exchanging information such as the necessary transfer speed. In this way, with a device that uses the CAV method and records a constant amount of information per unit length of the track, it is necessary to adjust the transfer speed for each recording radius, but it is possible to simplify the rotational drive of the disk and increase the capacity. It has features such as being able to record information such as:

In the first to fourth embodiments described above, in order to make the explanation easier to understand, an example was shown in which the erasing operation and the writing operation are switched each time the disk rotates once. This prevents unnecessary rotation waiting time from occurring, but this can also be achieved, for example, by switching the operation approximately every two rotations of the disk. Similarly, it is also possible to switch the shaft type every several rotations of two or more rotations.

These can be implemented by changing the timing of operation switching, increasing the storage buffer capacity accordingly, and increasing the number of tracks to be jumped during track jump.

Although two embodiments of the present invention have been described below, the present invention is not limited to these embodiments.

For example, in this example, the electromagnet is installed facing the optical head, but it may be installed on the same side as the optical head. Further, although an example is shown in which an electromagnet is used as the magnetic field generator, a permanent magnet may be used, and there is no limitation.

In addition, although this example shows an example of recording on a spiral track, it is also possible to record on a concentric track, for example, by changing the track jump control.
The shape of such a track is not limited in any way 6 Also, recording may proceed from the inner circumference to the outer circumference of the disk, or recording may proceed from the outer circumference to the inner circumference, and is not limited to the embodiments. In addition, in the basic recording operation, when determining whether to start writing after the erase operation is completed, in this embodiment, control is performed to wait for rotation if the amount of accumulated information does not reach a set value. However, for example, it may be possible to perform control such that writing is performed up to the amount that has been accumulated.Furthermore, for sector structure formats, a recording operation control unit having multiple buffers has been shown in the embodiment; Whether a single storage buffer or multiple storage buffers are used is not limited by whether or not a sector structure format is used. Therefore, a single storage buffer may be used for sector-formatted disks, or multiple storage buffers may be used for disks without sector structure, and there is no limitation. or CLV, and is not limited by this. Thus, any modification is possible without departing from the spirit of this invention, and such modification shall not be limited to this invention. It is included in the invention.

〔Effect of the invention〕

According to the present invention, it is possible to realize a device that can record a large amount of information that is continuously transferred from the outside at high speed in substantially real time without losing the capacity of the disk. In addition, it is extremely easy to use, as it is possible to perform an operation similar to rewriting by overwriting with one head without having to be aware of the erasing operation during the rewriting operation, and can record a large amount of information. Optical information recording and reproducing devices can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the state of a recording area when information on a disk is rewritten by a device according to a first embodiment of the present invention, and FIGS. 2, 3, and 4 are diagrams showing one embodiment of the present invention the second of
FIG. 5 is a diagram showing the state of the recording area when information on the disk is rewritten by the apparatuses according to the embodiment, the third embodiment, and the fourth embodiment, and FIG. 6 is a schematic diagram showing the configuration of a recording operation control section of the apparatus according to this embodiment. FIG. 7 is a diagram showing a schematic configuration of the recording operation control section of an apparatus according to another embodiment of the present invention. A diagram showing
Figure 8 shows the state of the recording area when the information on the disc is rewritten by a conventional device, and Figure 9 shows the state of the recording area when the information on the disc is rewritten by another conventional device. FIG. 10 is a flowchart of the rewriting operation. Agent Patent Attorney Yudo Nori Chika Kikuo Takehana Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8

Claims (4)

[Claims] (1) An information recording method that performs recording by erasing old information in a predetermined area using one head on a rotatably driven rewritable disk and writing information in the erased area, the method comprising: An information recording method characterized in that erasing of information is completed before the information writing start device or before the device comes to the same radius as this position. (2) An information recording method that performs recording by erasing old information in a predetermined area using one head on a rotatably driven rewritable disk and writing information in the erased area, the method comprising: An information recording method characterized in that writing of information ends before the information erasure end position. (3) The information erasure end position is set by providing at least a time for moving the head to a writing start position or a time for switching from the erasure mode to the recording mode. information recording method. (4) The information recording method according to claim 2, wherein the information writing end position is set by providing a time for switching the head to the next erasing mode.