KR910006157B1 - Additional data recording method of optical recording medium and apparatus therefor - Google Patents

Abstract

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Description

Additional data recording method of optical recording medium and apparatus therefor

1 is an explanatory diagram showing a configuration of one embodiment of a data addition recording method of an optical recording medium of the present invention.

2 is a block diagram showing an example of an apparatus for performing an additional data recording method of an optical recording medium of the present invention.

3 is a flowchart showing the operation of the data addition recording method of the optical recording medium of the present invention.

* Explanation of symbols for main parts of the drawings

1: Write / Read Head 2: Drive Circuit

3: writing means 4: reading means

5: mode switching means 6: mode switching determining means

RW: Deceleration area T _{1 to} T _n : Track

S ₁ , S ₂ ,... : Sector P: Preamble

D: data

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data addition recording method and apparatus for an optical recording medium in which a plurality of preambles and a writing sector consisting of data are successively recorded on a data track.

In general, an optical recording medium has a structure in which optical change patterns such as reflection, transmission, or polarization are formed in a recording area to write data.

This optical change pattern is formed by making a local physical change in the recording area.

This change is unavoidable in most optical recording media.

For this reason, it is impossible to rewrite the data once written, and it is necessary to perform additional recording on the area where the data is not written.

For example, in a card type optical recording medium, the case where data is recorded on this kind of optical recording medium is called a preamble, and it is common to set the data information when reading data as a synchronization area.

In the case of additional data recording, there are a method of performing track units and a sector unit.

The former method is to write data in a track in which data is not completely written. The track is divided into a plurality of sectors having a fixed number of data lengths for the track, and the preamble is added at the beginning of each sector write. Write data.

On the other hand, the latter method is a method in which data of several sectors is written in a track in which data for several sectors has already been written, and the data of sectors written therein is read and finished. The last end of the sector is detected, and thereafter, the sector to be additionally recorded is written.

However, the method of additionally recording data in units of tracks described above must be written independently on separate tracks at different positions, even if the additional recording data is continuous with the already recorded data.

For this reason, the procedure in the case of reading a series of data becomes complicated, and there exists a fault which takes time to access data.

Therefore, this method has a problem in that data written to a track cannot satisfy a request to continue writing to that track.

This method also requires that most unused tracks be prepared for further recording.

On the other hand, on the track side where data is written, many unwritten areas remain, resulting in poor use of the recording area and uneconomical disadvantages.

On the other hand, in the method of additionally recording in sector units, since a series of data can be continuously written on the same track, and data is written in sector units, the unused area in each track is reduced, which makes the recording area more efficient. You can use it nicely.

However, there is a significant shortcoming in the practical use of the method of additionally recording as such a conventional sector unit for the following reasons.

That is, in this type of optical recording medium, when data is additionally recorded on a track, the read mode reads the data of the sector at the end of the recording by the read mode, and detects the last end of the recording. Afterwards, additional recording data is written by the writing mode.

In the case of this type of optical recording medium, in general, in the writing and reading of data, the operation is different, and therefore, the operation speed is very different.

That is, in writing data, since a physical beam or a chemical change is generated at the light beam irradiation position of the optical recording medium by a light beam such as a laser beam, some time is required.

On the other hand, in reading, since the optical change state by the physical or chemical change which has already been formed is detected by the light beam, operation | movement is terminated almost instantaneously. Therefore, at the time of writing and reading, the moving speed of the light beam is changed.

For this reason, control of deceleration timing writing start position setting etc. at the time of switching from a read mode to a write mode has a complicated flaw.

On the other hand, while reading out at the same speed as the writing mode has been devised, there is a drawback in that it takes time to access the writing position of additional recording data.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to continuously write a series of data on the same track, and to reduce the unused area in each track and to efficiently record the recording area. In addition, data can be added to an optical recording medium that can practically realize a method of additionally recording on a sector-by-sector basis by simplifying the control of the timing of switching from a read mode to a write mode, setting of a write start position, and the like. The purpose is to provide a recording method.

The present invention provides an additional recording method for an optical recording medium in which a preamble and data including synchronization information are recorded in a write sector of a data track and a plurality of data tracks can be recorded successively. In data tracks with parts and unwritten parts, the data to be written is placed behind the sector at the end of the part that has already been written, and when switching from a read mode to a write mode, After setting the deceleration area of the length corresponding to the deceleration time necessary for the relative speed with respect to the recording medium to be the speed of the write mode at the speed of the read mode, the data to be additionally recorded in this sector is continuously It is characterized by writing as.

In addition, the present invention is a device for implementing the above method, wherein the head is relatively moved with respect to the recording medium along its data track at a write / read head and at a corresponding speed at the time of writing and reading the data, respectively. And a writing circuit for sending write data to the head and performing write control, and a reading unit for processing a signal detected by the head and reading out a control signal or data. According to the additional write command of the above, first, the drive circuit and the read-out means instructs the read mode to the read-out means, and when the mode change signal is inputted, the mode switch to command a change to the write mode to this. Reading information from reading information outputted from the reading means in accordance with the means and the additional recording instruction. After the charge, it hayeoseo continuous, monitoring whether or not do the next sector preamble is present, and when there can be detected the next sector preamble of, characterized in that it includes the the modal conversion determining means for outputting a modal conversion signal.

Preferably, the present invention detects the last end of the portion in which the data of the data track to which data is to be additionally written has been written by the write / read head reading at the speed of the read mode, and ending the sector. Then, when the next preamble cannot be detected within a certain time, it is determined whether or not the deceleration area is determined, and the write / read head is decelerated at the speed of the write mode, and after the speed of the write mode is reached, the write is performed.

In addition, the present invention preferably has a function of decelerating the moving speed of the head when the mode switching means receives a command of the mode switching from reading to writing to the drive circuit, and writing is enabled when the speed of the writing mode is reached. (Enable) function to send a signal to the writing means.

On the other hand, the write / read head sets the deceleration area of the length corresponding to the deceleration time required for the write mode to be the speed of the write mode at the speed of the read mode, and starts additional recording continuously in this deceleration area. The timing to set is set.

Writing is performed successively in this deceleration area, in the same manner as the part already written, the sector to be additionally recorded in the order of preamble and data.

Since the present invention writes data in sector units, a series of data can be continuously written on the same track, and the recording area of the unused area on each track can be used efficiently.

In addition, the present invention provides a deceleration of a length corresponding to the deceleration time required when switching from a read mode to a write mode behind a sector at the end of the data end where data has already been written. By setting the area, the relative moving speed of the write / read head can be reduced from the read mode to the write mode speed between the start end and the end end of the deceleration area.

For this reason, by starting writing on the basis of the last end of the deceleration area, the control becomes extremely simple with respect to the timing when switching from the read mode to the write mode, the setting of the write start position, and the like.

EXAMPLE

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows the structure of one embodiment of the data addition recording method of the optical recording medium of the present invention.

The additional recording method shown in FIG. 1 is applied to a card type optical recording medium.

In this embodiment, tracks of T ₁ to T _n are formed side by side in the card type optical recording medium.

In each track T _{1 to} T _n , data is written as a sector unit, like sectors S ₁ , S ₂ ,...

The sectors S ₁ , S ₂ ,... Are set as fixed lengths of the number of data and consist of the preamble P and the data D, respectively.

By the way, in order to additionally record data on the optical recording medium constructed by such a format, it is performed as follows.

First, a track to which additional recording data should be written is selected, and an additional recordable area in the track is detected.

The detection of the additional recordable area is performed by the read / write head in order of preamble (P) and data (D) in order of the information on the sector which has finished recording at the beginning of the track as the read mode. This is done by performing a read operation.

This makes it possible to detect the completed sector S and to detect the last end thereof.

Then, when the preamble P of the next sector is not detected, it is possible to judge the case where the existence of the sector which has finished recording is reached and the additional recordable area is reached. The write control switches the read-write head mode from read to write.

At this time, the read / write head gradually decelerates and becomes the speed of a normal write mode when a predetermined time elapses.

The deceleration area RW is set corresponding to this time elapse. That is, this deceleration area RW is set as the passage of time in the operation control program of the read / write head.

This deceleration region RW appears as an incomplete blank area on the optical recording medium, and becomes an area indicated on the track during the period of deceleration for conversion from a read mode to a write mode.

This area is of a constant length if the read mode and the write mode have constant speeds, so that normal writing is possible when writing is started after a certain time has elapsed after the mode switching.

In this case, the writing start timing and the writing start position are set on the basis of the time point after a predetermined time has elapsed as described above after the mode switching.

Therefore, the writing start timing and the writing start position can be set only by monitoring the passage of time, thereby simplifying the control.

Next, in the case of reading data from a track including additionally recorded data, the data is read in the order of sectors S ₁ , S ₂ ,... From the start end of the track in the same manner as above.

When the deceleration area RW is reached, this part is skipped and read. In the above additional recording, the head can be decelerated when the deceleration area RW is reached, but deceleration is not performed when data is written. The distinction between the two can be performed by, for example, software.

The additional recording of the above data may be performed by any apparatus, but some preferred apparatuses are as shown in FIG.

The apparatus shown in FIG. 2 includes a write / read head 1 and a drive circuit 2 for moving the head 1 along a data track at a corresponding speed at the time of writing and reading data. And writing means 3 for sending write data to the head 1 and performing write control, and a read-out Susan 4 for processing the signal detected by the head 1 to read control signal data and the like. And).

Up to this point, the structure is the same as that of a normal write / read device.

In the present embodiment, the read mode is first commanded to the drive circuit 2 and the read means 4 in accordance with an additional write command from the outside, and when a mode switching signal is inputted, the write mode is written to the write mode. In accordance with the mode switching means 5 for commanding the change and the read information output from the read means 4 in accordance with the additional write command, after the end of the read information, there is a preamble of the next sector. And mode switching determining means 6 for outputting a mode switching signal when the preamble of the next sector cannot be detected.

The mode switching means 5 and the mode switching determination means 6 perform a function as the read / write control apparatus described above.

The operation in the case of performing additional data recording of the present invention by the apparatus shown in FIG. 2 will be described with reference to the flowchart of FIG.

First, the drive circuit 2 moves the head 1 on the track set at the speed of the read mode, and then reads the record information from the track by the read means 4 (step 1).

The reading means 4 sends the read information to the mode switching determining means 6.

Here, in the read information, the data end portion for each sector and the preamble for the next sector are detected.

At this time, since the last data recording sector is detected, when the preamble is not detected continuously, the mode switching determining means 6 outputs a mode switching signal (steps 2, 3, 4).

The mode switching means 5 receives this, and instructs the drive circuit 2 to change the speed of the writing mode at the speed of the reading mode of the head 1.

Correspondingly, the drive circuit 2 changes the head 1, which does not decelerate, from the speed of the read mode to the speed of the write mode (step 5).

Then, has the drive circuit 2 reached the desired writing speed? While checking, the write enable signal is output when the target writing speed is reached (steps 6 and 7).

Upon receiving this write enable signal, the writing means 3 controls the head 1 to be writable, and outputs additional recording data to the head 1 to write data therein ( Step 8).

By the above operation, data can be additionally recorded, and when the data is read from the track on which data is additionally recorded, the mode switching determination means 6 reads out at least longer than the deceleration time. If the next preamble is detected in the meantime, data reading is continued.

Therefore, the deceleration area RW is to be skipped.

In the above embodiment, an example of moving the head 1 is shown, but the optical recording medium side may be moved.

As described above, according to the present invention, a series of data can be continuously written to the same track, and the recording area can be used efficiently for each unused area for each track, and the write mode can be written in the read mode. By simplifying the control of the timing at the time of switching to, the setting of the write start position, and the like, there is an effect that the method of additional recording in sectors can be practically realized.

Claims (4)

A data pre-recording method for an optical recording medium in which a preamble and data containing synchronization information are recorded in a data track write sector and data tracks can be recorded in succession, wherein the data has already been written. In a data track with an unwritten part, the write / read head (1) is used to position the data to be additionally written after the sector at the end of the already written part, and to switch from the read mode to the write mode. In order for the relative speed of the recording medium to be the speed of the read mode at the speed of the read mode, a deceleration area RW of a length corresponding to the required deceleration time is set, and is continuously added to this deceleration area RW. An additional data recording method for an optical recording medium, characterized in that data to be recorded can be written in units of sectors. 2. The method according to claim 1, wherein the final end of the already written portion of the data of the data track for which data is to be additionally recorded is detected by reading the relative speed of the write / read head 1 as the speed of the read mode. After the end of the sector, when the next preamble cannot be detected within a certain time, it is determined as the deceleration area, and the relative speed with respect to the recording medium of the write / read head 1 is decelerated to the speed of the write mode. An additional data recording method of an optical recording medium which performs writing after the speed of the writing mode is reached. A data recording / recording apparatus for an optical recording medium in which a preamble including synchronization information and data are recorded in a writing sector of a data track and a plurality of data tracks can be recorded successively. ) And a drive circuit 2 for relatively moving the head 1 relative to the recording medium along its data track at a speed corresponding to the data writing and reading operations, and the head 1 writing. Writing means (3) for sending data and performing write control, and reading means (3) for processing the signals detected by the head (1) and reading control signals and data; According to the additional write command, the read mode is commanded to the drive circuit 2 and the read means 4, and when the mode change signal is inputted, the change mode is written to the write mode. In the read information output from the readout means 4 in accordance with the mode switching means 5 and the additional write command, after the end of the readout information, whether the next sector preamble exists continuously is monitored. And mode switching determining means (6) for outputting a mode switching signal when the preamble of the next sector cannot be detected, and an additional recording device for an optical recording medium. 4. The driving circuit (2) according to claim 3, wherein when the mode switching means (5) receives a command for mode change from reading to writing to the drive circuit (2), the means for slowing down the moving speed of the head and the speed of the writing mode are reached. And means for sending a write enable signal to the writing means (3), and an additional data recording apparatus for an optical recording medium.

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