JP2542419B2 - Data recording method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a data recording method of a record carrier capable of additionally recording data in unit blocks.

[Conventional technology]

Conventionally, a paper tape, a magnetic tape, or the like has been used as a record carrier for sequentially recording data.
When data is recorded on these record carriers, the end of the record data is represented by providing an END mark, a feed, or the like, which means the end of the data, at the end of the record data. At the time of data reproduction, the end of the data can be detected by detecting this END mark or the like.

When data is additionally recorded on such a record carrier, it is necessary to know the end position of the already recorded data. For example, in the case of a magnetic tape, it is possible to know how far the data is recorded by searching the END mark, overwrite the END mark from the position of the END mark, and additionally record the data. The END mark is recorded again at the end of the recorded data.

However, for example, in a record carrier such as an optical card in which the recorded data cannot be rewritten, the END mark cannot be overwritten. Therefore, a predetermined number of consecutive data is recorded from the block in which the data is recorded. After confirming that the block in which the data is not recorded continues, the block in which the data is normally recorded at the end is determined to be the last recorded block. Then, after the final block is detected, the data is recorded in order from the beginning of a predetermined number of blocks without continuous data following the final recording block to realize sequential data recording. At the time of this data recording, there are blocks that cannot be recorded due to external factors such as defects due to dust and dirt on the record carrier, or vibration of the data recording device. An area with no data in the block is created. This can occur remarkably in a high-density record carrier such as an optical card having a track pitch of 12 μm.

[Problems to be solved by the invention]

When the number of blocks without continuous data generated in the data recorded area is equal to or larger than the number of blocks in which the data for determining the final recording block is not recorded, an error such as dust, dirt, vibration, etc., occurred during recording. When the external factor is removed, the block becomes a block in which no data is recorded, so that it is indistinguishable from the block without continuous data for detecting the last recorded block.

This causes a big problem of making a mistake in the determination of the final recording block, and if you add data while making a mistake in the determination of the final recording block, the data will be recorded on the already recorded block. , The principle of sequential addition is lost and it becomes impossible to manage data.

The present invention has been made in view of such problems, and an object thereof is to provide a data recording method capable of surely detecting a final recording block and performing sequential data management.

[Means for solving problems]

In order to achieve the above object, a data recording method according to the present invention is such that detection of a final recording block of a record carrier in which data is recorded for each predetermined unit block is continuously determined after a block in which the data is recorded. When a block in which some data is not recorded continues, the block in which the data is recorded is determined to be the last recorded block,
In a data recording method of recording data from a block in which a predetermined number of data is not continuously recorded after the last recording block, the number of blocks is equal to or less than a predetermined number of blocks in which the data is not recorded for determining the last recording block. If a certain number or more of blocks cannot be continuously recorded due to some external factor, data is not recorded thereafter.

〔Example〕

FIG. 4 is a block diagram showing an embodiment of a data recording / reproducing apparatus for an optical card to which the data recording method according to the present invention is applied. The data recording / reproducing on the optical card is configured to be controlled by a microcomputer. ing.

In FIG. 4, a central processing unit (CPU) is provided on the bus 1.
2. Stored memory (ROM) such as program memory
3, a working area (RAM) 4 including registers used in various processes by the CPU 1, a data file 5 in which recording data to be recorded on the optical card C is recorded, a recording / reproducing circuit 6 and a pulse motor 7 are connected. There is.

The optical head 8 includes a recording / reproducing circuit 6 and a pulse motor 7.
The optical card C is irradiated with a light beam to record and reproduce data.

 FIG. 5 is a schematic plan view of the optical card C.

On the optical card C, a main data recording section M consisting of data tracks M ₁ , M ₂ , ..., M _n as unit blocks for data recording, and a directory D ₁ for managing data files, An auxiliary data recording section D including D ₂ , ... Is provided. Also, each data track M ₁ , M ₂ , ..., M
On each extension of _n, the data tracks M ₁ verify that indicates that data has been normally recorded in ~M _n (the Verify) mark (hereinafter, referred to as V mark) V _1, V _2, ..., from V _n A verification mark recording section V is provided.

Data is recorded on the data tracks M _{1 to} M _n of the main data recording section M one track at a time from the upper part of the optical card C to the lower part in the drawing. The directories D ₁ , D ₂ , ... Of the auxiliary data recording section D are recorded every time data recording from the data file 5 is completed. In the case of this embodiment,
As shown in the figure, 5 directories can be recorded in one track. In one track, one directory is recorded from left to right in the figure, and after recording 5 directories, the recording is moved to the upper track in the figure, and the upper track is sequentially recorded. I will add to.

FIGS. 6A and 6B are data formats of the data track Mj (j = 1 to n) and the directory Dj in FIG.

In FIG. 6 (A), the track number area 10a in area for recording the number of the data track, if the data track M ₁ "1", the data track M ₂ if sequentially following the serial number "2" Record. Data area 10
b is the area for recording the main data of the track, and ECC
The area 10c is an area for recording an error correction code.

In FIG. 6 (B), a directory number area 11a is an area for recording the number of the directory record a if the directory D ₁ "1", if the directory D ₂ "2",
After that, consecutive numbers are stored. The directory area 11b is an area for recording main data contents of the directory, for example, a file name, a date, a file size and the like. The EOT address area 11c is the last recording track (EOT: End of trac) of the main data recording section M when the directory is recorded.
It is an area for recording the address of k) and does not always match the actual EOT number. The ECC area 11d is an area for recording the error correction code.

FIG. 7 is an enlarged view of the main data recording section M and the verify recording section V in FIG. Data track
Recording bits 12 that are modulated according to the recording information and that are optically detectable by scanning the optical card C with a light beam that is narrowed to a minute spot are recorded in M _n-3 , M _n-2 , .... ing. In order to accurately record or reproduce the recording bit 12, it is necessary to control the irradiation position of the light beam in a direction perpendicular to the scanning direction, and the tracking tracks T _n-3 , T _n-2 , ... Is provided.

Next, a method of recording data in the main data recording section M will be briefly described with reference to FIG.

First, in the direction of the arrow a shown in the figure, the tracking track Tj
Data is recorded on the data track Mj by moving the light beam modulated by the recording information while performing automatic tracking (hereinafter referred to as AT) along the track. When the data for one track is recorded, the light beam is reversed and the light beam is scanned in the direction of arrow b this time, and the data just recorded is reproduced and compared with the recorded data to check whether or not the data is correctly recorded. A so-called verify operation is performed to do so. If the verification result is normal, it means that the data was normally recorded on the extension line of the data track Mj.
Record mark Vj. If normal recording cannot be performed due to a defect of the optical card and an error occurs during verification, the V mark V _{j is} not recorded and the next track M _{j + 1} is moved to record the same data again. Perform processing.

 Next, a data recording method according to this embodiment will be described.

First, the procedure for determining EOT will be described using the flowchart in FIG. In this embodiment, there is a data track (hereinafter referred to as M _E ) in which information is normally recorded and a V mark is recorded, and five consecutive data-less tracks (the first one of which is a track after the data track M _E ). A track is referred to as M _F ) (however, it is assumed that information recording is normally performed after the data track M _E and no data track with a V mark exists). Judge M _E as EOT.

FIG. 3 shows an EOT of an enlarged view of the optical card C shown in FIG.
The following shows an example in which there is a defect in the data track and an example in which only the data is recorded without the V mark. There is a V mark V _E on the data track M _{E in the} figure.
After M _F, there are at least 5 consecutive dataless tracks. Defects X ₁ and X ₂ are present on the data tracks in FIGS. 3 (a) and 3 (b) (the defect X ₁ is continuous 3 tracks, and the defect X ₂ is continuous 5 tracks). When a light beam scans this track, the AT is displaced at the defect portion and normal recording cannot be performed.
Further, the data tracks M _{D1 to} M _D4 of FIG. 7 (c) have no V mark recorded because of a verify error during data recording.

In order to judge EOT, first, all directories on the optical card C are read (201 in FIG. 2). As mentioned above, EOT address information is written in the directory,
This information causes the head to seek to the EOT address in step 202. After step 203, V mark detection for EOT determination and detection of 5 consecutive data-less tracks are performed. In step 203, one track is played back,
At step 204, it is checked whether or not the AT is out of the track. If there is an AT deviation, the number of AT error tracks in the RAM 4 in the RAM 4 is incremented by 1 in step 205, and the same track is again moved in the opposite direction in step 206 to confirm the presence of the V mark and data. Play more. This is because when the reproduction operation of one track is performed in step 203, a defect may occur in the tip portion of the track or the like and the AT may be lost.

In step 207, it is judged whether or not there is a V mark on the reproduced track, and if there is a V mark, the process proceeds to step 211 and the currently reproduced track number indicating temporary EOT is saved in the RAM 4 and the error track number and AT error track number are cleared. That is, it returns to zero and goes to step 214. If the V mark is absent in step 207, it is determined in step 208 whether the AT is out of alignment, and if there is, the process proceeds to step 213. If not, it is judged in step 209 whether or not the data is recorded. If it is recorded, the number of AT error tracks in RAM4 is cleared in step 212, and the V mark is finally saved in RAM4 in step 213. The difference between the track position and the current track position is set to the error track number indicating the error track number after EOT in the RAM 4, and the process proceeds to step 214. The number of error tracks in step 213 includes both the case where there is an AT error and the case where there is no AT error such as the case where there is data in the judgment of 209. Step 20
If you judge that there is no data in 9 (this means that there is no AT error and data recording on this track),
In step 210, it is judged whether there is no data for 5 consecutive tracks and "N
If “O”, go to step 214 and move to the next track, 5
Repeat from step 203 until there is no track continuous data. If there is no continuous data for 5 tracks in step 210, the track number saved in the RAM 4 is judged to be EOT and the processing is ended. The number of AT error tracks and the number of error tracks in RAM4 are used in the data recording described below.

Next, a procedure for recording data will be described with reference to the flowchart shown in FIG.

As described above, in the present embodiment, the EOT is determined with 5 consecutive data-less tracks. To detect this EOT, 5 or more consecutive EOTs are recorded between the EOT and the next recording track. There should be no data-less tracks. Therefore, when data cannot be continuously recorded over three tracks, no data is recorded before that so that no more than five tracks are continuously recorded. The value of 3 tracks is determined by looking at the margin (margin) for 1 track in order to ensure that the number of tracks is less than 5 tracks.

The sequence of data recording for one track will be described below.

First, in step 101, it is checked whether the number of AT error tracks in the RAM 4 determined in FIG. 2 is 0. If 0, it is determined in step 113 whether the number of error tracks is smaller than m. Tracks that have no V mark more than m times consecutively, that is,
This is to prevent a track that is not normally recorded from continuing. The value of m is determined by the reliability of the medium, the throughput at the time of reproduction, and the like. If the number of error tracks is larger than m in step 113, no more recording is performed and the process ends in error. If m or less, the process proceeds to step 106. If the number of AT error tracks is larger than 3 in step 102, that is, if it is 4 or more, no more recording is performed and the process ends in error. If the number of AT error tracks is 3 or less in step 102, AT is detected in step 103.
It is judged whether the number of error tracks is 3, it is not 3,
That is, if it is smaller than 3, the process proceeds to step 106. If the number of AT errors is 3, the track to be recorded next in step 104, that is, the number of the error tracks stored in the RAM, which is 1 more than the EOT address saved in the RAM 4, is added. Move the light beam to the track and scan the light beam to check if the track is out of AT. Then, at step 105, if there is an AT deviation on that track, no further recording is performed and the processing ends in error. If the AT does not come off, the process proceeds to step 106 and thereafter to record data.

In step 106, the track for recording the light beam next,
That is, the EOT address saved in the RAM4 is moved to a track ahead by a number equal to the number of air tracks stored in the RAM4 plus one, and the data recording and verify operation of one track are performed in step 107. . If the number of AT error tracks is 3 in step 103, and if the AT deviation check is performed in step 104, the light beam has already moved to the track to be recorded next, and therefore the operation of 106 is performed. unnecessary. In step 107, it is determined in step 108 whether there is AT deviation during operation. If there is no AT deviation, the number of AT error tracks in RAM4 is cleared in step 109 (if there is no AT deviation, data is recorded), and in step 110. It is judged whether the verification result is normal, and if there is an error, the procedure goes to step 115, and if it is normal, the procedure goes to step 111 to record a V mark on the track, and move the light beam to the next track in preparation for the next write operation. To do. Then, in step 112, the number of error tracks and the number of AT error tracks in the RAM 4 are cleared, the track number of the EOT which can be recorded normally is saved, and the process ends.

If it is determined in step 108 that the AT is out of the recording operation, the process proceeds to step 114 and the number of AT error tracks in the RAM 4 is incremented by one. This is because if there is a defect at the tip of the write track or the like in step 107, AT is lost and no data is recorded on that track. AT
If the deviation occurs in the middle of the track, the information is recorded until then, but in the present embodiment, when the AT deviation occurs, it is not possible to judge whether the information was actually recorded. Even if step 114
The number of AT error tracks is incremented by. In the embodiment in which it is possible to judge whether or not the information is recorded even if the AT is out, it is sufficient to increment the AT error track number by +1 only when the information is recorded. After the number of AT error tracks in the RAM 4 is incremented by 1 in step 114, it is determined in step 115 whether or not retry has been performed n times in this one-time data recording routine. If AT fails or if an error occurs during verification, recording is performed again on the next track, but the maximum value of this retry is n times. If the number of retries has reached n in step 115, no further recording is performed and the processing ends in error. If it is less than n times, go to step 116 R
The number of error tracks in AM4 is incremented by 1 and repeated from step 101 until data can be recorded normally. If the number of AT error tracks becomes 4 or more in step 102 before the number of retries reaches n or there is an AT deviation in step 105, the processing ends in error at that point.

When one track of data has been recorded and the next data is to be recorded, this routine is started from the beginning.

Then, when file management is performed using a directory, when the data recording for one file is completed, the directory including the EOT address is recorded.

According to the present embodiment, if the defect extends over 2 tracks or less, recording can be performed without any problems after the defect, and in the case of the defect extending over 3 tracks as shown in FIG. 3 (a), the fourth track does not deviate from AT. Since it is confirmed that recording can be surely performed on the fourth track, and in the case of a defect extending over four tracks as shown in FIG. 3B, recording is not performed before the defect.

In this embodiment, the number of continuous out-of-track tracks is 3, the number of tracks without continuous data for EOT detection is 5, and defects up to 3 tracks can be tolerated. However, due to the difference in allowable defect size, These values will change. Further, although the margin for one track is provided in the present embodiment, it is also possible not to provide the margin, and it is also possible to provide the margin for two tracks or more.

Further, in the present embodiment, the V mark is recorded when there is no error as a result of the verification, but it goes without saying that the present invention can be applied even when the V mark is not recorded.

Further, in the present embodiment, the final track having the V mark is the final recording track. However, since there is an error in the recording after the final track having the V mark, there is an error in V.
It is also possible to set a track without a mark as the final recording track.

〔The invention's effect〕

According to the present invention, when the number of consecutive blocks that cannot be recorded due to the AT deviation is more than a predetermined number of the blocks with no continuous data for the final recording block detection, the data is not recorded thereafter. Even if external factors such as dust, dirt, etc., which caused the above, or device vibration, etc., are removed, the number of consecutive blocks that could not be recorded due to the loss of AT is the block without continuous data for detecting the final recorded block. It is possible to surely detect the final recording block without confusing it with the predetermined number. This makes it possible to realize sequential data management.

[Brief description of drawings]

1 to 7 are explanatory views showing an embodiment of the present invention, in which FIG. 1 is a flowchart showing a data recording procedure, FIG. 2 is a flowchart for EOT detection,
FIG. 3 shows a case where there is a defect in the track or data is recorded but a V mark is not recorded due to a verify error, and FIG. 4 is an optical card to which the data recording method according to the present invention is applied. 5 is a block diagram showing an embodiment of the data recording / reproducing apparatus of FIG. 5, FIG. 5 is a schematic plan view of an optical card, and FIGS. 6A and 6B show data formats of a data track and a directory of the optical card. 7 and 8 are enlarged views of the main data recording section of the optical card. M: main data recording part (data track part), M _E: last recording track, M _F : first track among 5 continuous data-less tracks, M _D1 , M _D2 , M _D3 , M _D4 ...... A track in which a V mark is not recorded due to a verify error during data recording, V ... verify mark recording area, V _E
V mark corresponding to the last recorded track, X ₁ , X ₂ ... Defect.

Claims (1)

(57) [Claims] 1. When sequentially recording data on a record carrier for each predetermined unit block, a predetermined number of data is continuously recorded after the last block in which the data is sequentially recorded. When a block that has not been recorded continues, the final block in which the data is recorded is determined to be the final recording block, and data is recorded in each block in a method of sequentially recording the data following the final recording block. Before doing so, determine whether the block can be recorded, and if it is determined that it can be recorded,
If data is recorded in that block and it is determined that recording is not possible, the process moves to the next block and the determination of whether recording is possible and the recording of data are repeated. In order to detect the last recording block, if the data continues for a certain number of blocks below the predetermined number of unrecorded blocks, stop the recording operation and do not record the data thereafter. Data recording method characterized by.