JPS63273278A - Recording method and driving device for optical recording medium - Google Patents

Abstract

PURPOSE:To realize the maximum utilization of a recording area and to shorten an access time, by writing an alternate sector at the time of generating an error on a recording sector immediately behind a sector on which the said information is written. CONSTITUTION:When the error is generated in the information written previously, the generation of the error is detected 35, and an error flag is inserted 36 in the sector in which the said error is generated, and an alternate flag is inserted in the sector following the said sector. Next, a data signal (t) to be written on the sector in which the error is generated is written on the sector in which the alternate flag is inserted previously. Next, by scanning those sectors by a laser beam again, the error flag is read out by a detection circuit 31 and the alternate flag by a detection circuit 32, and furthermore, the presence/absence of the information written on the alternate sector is detected by a detection circuit 35.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording method for an optical recording medium and an optical recording medium driving device, and more specifically, to a method for rewriting information of an error sector in a so-called write-once optical recording medium. The present invention relates to a recording method and apparatus for recording.

[Conventional technology]

The preformat of the optical recording medium is, for example, as shown in FIG. 10, in which a large number of concentric tracks 101, 102, .
103 PA is formed, each track 101, 102 .
103 fists and more sectors 201.202.2
It is divided into 03-.... Each of these sectors 201,
At the beginning of 202, 203, and so on, an address indicating a track number and a sector number is attached, so that a large amount of information can be recorded.

By the way, since the tracks and addresses are formed by fine irregularities and are created through multiple transfers, it is practically difficult to form the entire recording area without defects, and it is usually not allowed. An optical recording medium with defects less than or equal to the allowable error rate is provided as a product. Information cannot be written to the defective sectors mentioned above, or only incomplete information can be recorded.For this reason, conventionally, after writing information to a specified address, the recorded information must be read out. to detect whether there is an error.

The format is such that when an error occurs, the information is rewritten in a different sector.

The conventional error information rewriting format is:

As shown in FIG. 10, a large number of tracks 101 are formed.
．． Some of the tracks 102, 103, etc. are prepared in advance as replacement tracks 100x, and some of the sectors obtained by dividing each recording track are used as replacement sectors. 200y is prepared in advance. If an error occurs, first write the information to the replacement sector 200y of the same track, and if information has already been written to the replacement sector 200y of the track and there is no free replacement sector, or if the replacement If the sector 200y itself is defective and an error occurs, write information that cannot be written in the replacement sector 200y to the replacement track 100x. It's getting crowded.

[Problem that the invention seeks to solve]

However, if the above-mentioned format is adopted, for optical recording media with a low error rate, use will be completed with replacement tracks 100x and replacement sectors 200y on which no information is written, resulting in wasted storage capacity. There is a problem in that it causes

On the other hand, for optical recording media with a high error rate, 100K of replacement tracks are written before writing information to all recording tracks.
And the replacement sector 200y becomes over-recorded, resulting in a waste of recording capacity.

Further, since the replacement sector and the replacement track are set in advance in a certain area, especially when the recording area and the replacement track are separated from each other.

There is a problem that access time when writing and reading information becomes long.

The purpose of the present invention is to solve the problems of the prior art described above,
You can make maximum use of the recording area.

Another object of the present invention is to provide a recording method for an optical recording medium that can shorten access time, and a drive device for carrying out the method.

[Means for solving problems]

In order to achieve such an object, the present invention writes information in a designated sector and then reads out the recorded information signal to detect the presence or absence of an error.

When an error occurs, an error flag is written to indicate that a replacement sector exists in the sector where the information was written.1Then, the sector following the sector where the information was written first is the replacement sector for the sector where the error occurred. This feature is characterized in that a replacement flag indicating that the sector has been replaced and information having the same contents as the previous sector are written.

C Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. An optical recording medium to which the present invention is applied is:

A preformat similar to that shown in FIG. 10 is used. FIG. 1 is a partially enlarged plan view of the main part of the preformat shown in FIG.
102.103 -- is a truck, 201.202.2
03... indicates a sector. Although not shown, address pits are formed at the beginning of each sector to display track numbers and sector numbers.

- For example, when dividing an information signal and writing information into four sectors at a time, each time writing of information for the specified four sectors is completed, the writing sector is scanned to detect the presence or absence of an error. explain.

First, as shown in Figure 1, the specified sector, for example 2
Write information 1 to sectors 01 to 204.

Next, the laser beam is scanned again on the sectors 201 to 204 to read out the previously recorded information.

Detect the presence or absence of a write error.

When there is no error, as shown in Figure 2, 20
New information 2 is written in the 205th to 208th sectors following the 4t sector, and the laser beam is scanned again to the 201st to 208th sectors to detect the presence or absence of an error.

If there is an error in one of the 201 to 204 sectors into which information has been previously written, for example, the 202 sector, an error flag 3 is written to indicate that a replacement sector exists in the 202 sector, as shown in FIG.

Next, as shown in FIG. 4, 20 sectors following 204 sectors
Each of the flags 31 writes a flag 4 indicating that it is a replacement sector of the 202 sector in the 5 sector, and then writes the information 5 to be written in the 202 sector again.
．． 4 and the information 1, 2.degree. 5 is written on a recording film not shown.

Of course, if there are multiple sectors in which an error has occurred, the previous processing is performed for each sector in which an error has occurred.For example, if an error has occurred in sectors 202 and 204, the process as shown in FIG. , an error flag 3 indicating that a replacement sector exists in sector 202 is written, and an error flag 6 indicating that a replacement sector exists also in sector 204 is written.

Next, as shown in FIG. 6, a replacement flag 4 indicating that sector 202 is a replacement sector is written in sector 205, information 5 to be written in sector 202 is written in sector 205 again, and sector 204 is replaced in sector 206. A replacement flag 7 indicating that the sector is a replacement sector is written, and information 8 to be written in the 204th sector is written again in the 206th sector.

Next, 201 to 206 to which information was written first
The laser beam is scanned over the sector again to detect the presence or absence of a write error.

When there is no error, as shown in Figure 7, 20
New information 9 is written in the 207th to 210th sectors following the G sector, and the laser beam is scanned again to the 201st to 210th sectors to detect the presence or absence of an error.

If there is an error in the 205 sector in which replacement information was previously written, an error flag lO is written in the 205 sector to indicate that there is a re-replacement sector, as shown in FIG.

Next, as shown in FIG. 9, a replacement flag 1 is set in sector 207 to indicate that it is the sector to be replaced with sector 205.
1 is written, and then information 12 to be written is written again in sector 205 (202).

Thereafter, writing of information for each four sectors and error detection are repeated in the same manner.

The recording method for an optical recording medium according to the present invention allows information to be written in the entire recordable area of both optical recording media with a low error rate and optical recording media with a high error rate, and the recording area can be maximized. For example, if one track is divided into 64 sectors, 12
In an inch optical disk recording medium, the recording capacity can be increased by about 3.5%, assuming that there are no defects on the disk. Furthermore, in a 5-inch optical disk recording medium divided into sectors of 7.17 yen per track, the recording capacity can be increased by about 6.25% under the same conditions.

Furthermore, since the replacement sector is written immediately after the sector in which the information is written, the access time when writing and reading information can be shortened.

In the above embodiment, the case where information writing and error detection are repeated every four sectors was explained as an example, but the gist of the present invention is not limited to this. The same method can be used when writing information and detecting errors are repeated for each sector.

Furthermore, in the above embodiments, only a disc-shaped optical recording medium was exemplified as an optical recording medium, but the gist of the present invention is not limited to this. It can also be applied to media.

Furthermore, when the optical recording medium is a disc-shaped optical recording medium, CAV (Constant angular
velocity), CL V (Consta
nt 1inear velocity), M
CAV (Modified constant a)
Any known drive method such as ngular vslocity) can be adopted, and access time can be shortened no matter which drive method is adopted. In particular, the present invention is suitable for MCAV type disk drive devices, which have a problem in that a long access time is required when a method in which replacement tracks and sectors are provided in advance is adopted.

Of course, one method for recording an optical recording medium according to the present invention is as follows.

For example, not only write-once type optical recording media equipped with a low melting point alloy recording film or an organic dye-based recording film.

For example, it can also be applied to an erasable optical recording medium equipped with a magneto-optical recording film, a phase change type recording film, or the like.

Next, an example of a drive device for carrying out the above-described recording method will be explained by taking a drive device for a disk-shaped optical recording medium as an example. FIG. 11 is a block diagram showing the configuration of the main parts of the disk drive device, and the 1213th! FIG. 1 is a block diagram showing the configuration of an error rewriting section for implementing the recording method according to the present invention.

The main part 21 of the disk drive is exactly the same as a conventional disk drive that rewrites information of a sector in which an error has occurred in a predetermined replacement sector or replacement track. That is, a spindle motor 21 that rotationally drives a disc-shaped optical recording medium, and this spindle motor 2
1, an optical head 23 that irradiates a light spot onto the disc-shaped optical recording medium, a data write control circuit 24 that writes information via this optical head, and Servo circuit 25 that applies a focussing servo and a seek servo to the optical head
and an information reproducing circuit 26 that converts the optical signal read from the optical head 23 into an information signal, and reads an address signal and a data clock signal from the reproduced information signal,
and an address detection circuit 27 that outputs an information write timing signal.

When the spindle motor 21 is driven to rotate and a seek address signal ρ is applied to the optical head 23 via the servo circuit 25, the optical head 23, the data reproducing circuit 26 . The reproduced data signal a, the data clock signal j, the address signal f, and the one-rotation clock signal g are transmitted through the address detection circuit 27.
and the timing signal are read out. Focusing servo and seek servo are applied to the optical head 23 according to the address signal f, and a predetermined address is selected. At the same time, the rotation speed of the spindle motor 21 is controlled by the one-rotation clock signal g. When writing information to a desired address, apply the seeker down input signal wheel and also apply a write data signal to the data write control circuit 24, and the predetermined address is read out in the same manner as above, and is read from the address detection circuit. The information is written to that address by the output timing signal.

First, the error rewriting section is as shown in the first section.

Error flag detection circuit 31 and replacement flag detection circuit 32
and a replacement sector data memory circuit 33 that stores information on the sector in which the replacement flag has been written.

A non-replacement sector data memory i-path 34 that stores information on sectors without replacement flags, and an error detection circuit 35 that detects the presence or absence of an error in a sector in which information has been previously written.
When the error detection circuit 35 detects an error, a flag insertion circuit 36 writes an error flag in the sector where the error occurred and also writes a replacement flag in the subsequent replacement sector, based on the data clock signal j from the address detection circuit 27. A timing signal generation port PI37 that generates a timing signal m is provided. Furthermore, a replacement generation flag circuit 38 generates a data invalidation signal based on a sector error signal n from the error flag detection circuit 31 and a replacement sector signal V from the replacement flag detection circuit 32; A NOT gate 39 that generates a non-swapping safeter signal based on the spacing sector signal V and correcting the storage contents of the non-swapping sector data memory circuit 34, and a NOT gate 39 that generates a non-swapping sector data memory circuit 34 based on the spacing sector signal V, and An OR gate 40 for selectively taking out the data signal S is provided.

As shown diagonally above, after information is written by the main section 21 shown in FIG. 11, the laser beam is scanned over that sector again to check whether there is any error in the previously written information.

If there is no error, no error is detected by the error detection circuit 35 and no flag is written from the flag insertion circuit 36. Therefore, the error flag and the replacement flag are not written by the error flag detection circuit 31 and the replacement flag detection circuit 32. is not detected, the reproduced data signal a
is not stored in the replacement sector data memory circuit 33 but only in the non-replacement sector data memory circuit 34.

Therefore, only the non-alternating data signal from the non-alternating sector data memory circuit 34 is read out as the data signal p via the OR gate 40.

If an error occurs in the previously written information, the error detection circuit 35 detects the occurrence of the error, and the flag insertion circuit 36 writes an error flag to the sector where the error occurred, and also writes the error flag to the sector following the sector. After the replacement flag is written in the sector, the data signal t to be written in the sector in which the error occurred is written via the flag insertion circuit 36 into the sector to which the replacement sector was written first.

Next, when the laser beam scans these sectors again, the error flag is read out by the error flag detection circuit, the replacement flag is read out by the replacement flag detection circuit, and the information written in the replacement sector by the error detection circuit 35 is read out. The presence or absence of an error is detected.

If there is no error, the replacement occurrence flag circuit 38 is activated based on the sector error signal n from the error flag detection circuit 31 and the replacement sector signal V from the replacement flag detection circuit 32.
A data invalid signal p is generated, and it is detected that the signal of the sector in which information was previously written is invalid. Also,
Along with this.

Information on the sector in which the replacement flag has been previously written is stored in the replacement sector data memory circuit 33 by the above-mentioned two signals n and V. Further, based on the replacement sector signal V from the replacement flag output circuit 32, a non-replacement sector signal is generated from the NOT gate 39, and the storage contents of the non-replacement sector data memory circuit 34 are corrected. Therefore, the non-alternating data signal r from the non-alternating sector data memory circuit 34 and the alternating sector signal 2 from the alternating sector data memory circuit 33 are selectively read out as the data signal p via the OR gate 40.

If an error occurs in the information written to the replacement sector, an error flag and an error flag are added to the replacement sector where the error occurred.
A replacement flag is written in the sector following the replacement sector in which the error occurred, and a data signal to be written in the sector in which the error occurred is written in the new replacement sector. Then, in the same manner as above, the alternate sector data memory circuit 3
The storage contents of 3 and the storage contents of the non-replacement sector data memory circuit 34 are corrected, and the data signal p is read out.
Ru.

〔Effect of the invention〕

As explained above, according to the present invention, when an error occurs in the recording sector, a replacement sector is written immediately after the sector in which the information is written.

Information can be written on all recordable tracks for both optical recording media with a low error rate and optical recording media with a high error rate, so there is no waste of recording capacity, and the information can be written in replacement sectors. Since data is written immediately after the sector in which data is written, the access time when writing and reading information can be shortened.

[Brief explanation of the drawing]

1 to 9 are principal part plan views illustrating an embodiment of the format of an optical recording medium according to the present invention. FIG. 10 is a plan view showing an outline of a preformat formed on an optical recording medium, and FIG. 11 is a block diagram showing an example of the configuration of the main parts of a disk drive device. FIG. 12 is a block diagram showing an example of the configuration of an error rewrite section of a disk drive device. 101.102.103--Nidrak. 201.202.203...: Sector, 301, . 3
02.303--- Near address bit. 1.2, 5, 8.9, 12: Information, 3.6.10: End flag. 4.7.11: Flag 21 Nispindle motor, 22; Motor control circuit. 23: Optical head, 24: Data write control circuit. 25: Servo circuit, 26: Data reproducing circuit, 27: Address detection circuit, 31: Error flag detection circuit. 32: Replacement flag detection circuit, 33: Replacement sector data memory circuit, 34: Non-replacement sector data memory circuit, 3
5: error detection circuit, 36: flag insertion circuit, 37: timing signal generation circuit, 38: replacement generation flag circuit, 3
9: NOT gate, 40: OR gate. Figure 10 Figure 11 Figure 12vA

Claims (2)

[Claims] (1) Write information to the specified sector, then read the recorded information signal to detect the presence or absence of an error, and if an error occurs, display that a replacement sector exists in the sector where the information was written A replacement flag indicating that the sector is a replacement sector for the sector in which the error occurred and information having the same content as the previous sector are then written in the sector following the sector in which information was written first. A recording method for an optical recording medium characterized by: (2) An optical recording medium having a guide track divided into a plurality of sectors is loaded, a desired sector is selected by irradiating a light spot along the guide track, and information signals are written and read. an error detection circuit that detects the presence or absence of an error from a playback data signal read from the optical recording medium; and when an error in the playback data signal is detected by the error detection circuit. 1. An optical recording medium drive device comprising: a flag insertion circuit that writes an error flag in a sector where the error has occurred, and writes a replacement flag in a sector following the sector in which information was previously written.