JPH0787004B2 - 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 on a track-by-track basis.

[Prior Art] 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, etc., 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.

[Problems to be Solved by the Invention] 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 and the END mark is erased. Therefore, there was a problem that some other means had to be provided.

Even if a means for erasing the END mark is provided, the END mark must be erased and recorded each time data is recorded, which causes a problem of wasting recording space.

[Means for Solving Problems] A data recording method of the present invention is a data recording method for recording data on a recording medium having a plurality of tracks by using a recording / reproducing head, wherein a series of data is recorded on the recording medium. After the sequential recording and the recording of the series of data, the index information including the position information of the recorded last track is written in an area different from the area where the data is recorded on the recording medium, and the already recorded data is recorded. When other data is additionally written after the above, the index information is read out, and based on this information, the recording / reproducing head is sought to the last track, and whether the data is a recorded track sequentially from the track next to the track sought. Whether or not it is detected by scanning the track and reading the recorded information,
When it is confirmed by the detection that a plurality of data unrecorded tracks are continuous, data is recorded from the first data unrecorded track detected among the plurality of data unrecorded tracks.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of an optical card data recording / reproducing apparatus to which the data recording method according to the present invention is applied. Data recording / reproducing on / from the optical card is controlled by a microcomputer. Is configured.

In FIG. 1, a bus 1 has a central processing unit (CPU).
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 stored, a recording / reproducing circuit 6 and a pulse motor 7 are connected. There is.

The optical head 8 is controlled by the recording / reproducing circuit 6 and the pulse motor 7, and irradiates the optical card C with a light beam to record and reproduce data.

FIG. 2 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 consisting of D ₂ , ... Is provided. Also, each data track M ₁ , M ₂ , ..., M
_On each extension line of _n , a verify mark (hereinafter referred to as a V mark) V ₁ , V ₂ ..., V _n indicating that data has been normally recorded in the data tracks M _{1 to} M _n is formed. 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, 5 directories can be recorded in one track as shown in the figure. In one track, one directory is recorded from the left to the right in the drawing, and after recording five directories, the recording is moved to the upper track in the drawing, and recording is sequentially performed on the upper track.

FIGS. 3A and 3B show the data format of the data track M _j (j = 1 to n) and the directory D _j in FIG.

In FIG. 3A, the track number area 10a is an area for recording the number of the data track, and the data track M ₁
In that case, “1” is recorded, and in the case of the data track M ₂ , “2” is sequentially recorded, and serially consecutive numbers are recorded. The data area 10b is an area for recording main data of the track, and the ECC area 10c is an area for recording an error correction code.

In FIG. 3B, the directory number area 11a is an area for recording the number of the directory,
If D ₁ is recorded as “1” and if directory D ₂ is recorded as “2”, 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.
This is the area for recording the track number of k), and the ECC area 11d
Is an area for recording an error correction code.

FIG. 4 is an enlarged view of the main data recording section M and the verify recording section V in FIG. Data track M _n-3 , M
Recording pits 12 that are optically detectable by scanning the optical card C with a light beam that has been modulated according to the recording information and that has been focused into a minute spot are recorded in _n-2 . In order to accurately record or reproduce the recording pit 12, it is necessary to control the irradiation position of the light beam in a direction perpendicular to the scanning direction, and 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, while performing auto-tracking (hereinafter referred to as AT) along the tracking track T _j in the direction of arrow a in the figure, the light beam modulated by the recording information is moved to record data on the data track M _j . When the data for one track is recorded, the light beam is reversed and this time the arrow b
By scanning in the direction, the recorded data is reproduced and compared with the recorded data to perform a so-called verify operation for checking whether or not the data is correctly recorded. If the verification result is normal, it indicates that the data was normally recorded on the extension line of the data track M _j.
Record mark V _j . 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, and the same data is recorded again. Is processed.

Next, the operation of the recording / reproducing apparatus shown in FIG. 1 will be described with reference to the flowcharts of FIGS.

FIG. 5 is a flowchart for recording the EOT track number in the EOT address area 3c of the directory D.

First, a sequence of newly writing data to the new optical card C on which nothing is recorded will be described.

When a new optical card C is loaded in the recording / reproducing apparatus of FIG. 1, first, in step 50, the optical head 8 seeks to the head track M ₁ of the main data recording section M.

In step 51, the track number area 10 of the data track M ₁ is
"1" is recorded in a and the data file 5 is recorded in the data area 10b.
After recording the data for 1 track, the error correction code is recorded in the ECC area 10c.

In the following step 52, verification is performed to check whether or not the data has been correctly recorded. If the data has not been correctly recorded, the result in step 53 is "No", and the flow proceeds to step 54. If it is correctly recorded, the result is "Yes" in step 53, the V mark V ₁ is recorded in step 55, and the process proceeds to step 56.

In step, track M ₁ recorded in step 51 in RAM4
Save the track number “1” of as a temporary EOT.

In the following step 57, it is determined whether or not all the data for one file of the data file 5 has been recorded. If not recorded, it is determined as "No" and the process proceeds to step 54, and if it is recorded, "Yes". , ”And proceeds to step 58.

In step 54, the optical head 8 is moved to the next track M ₂ and the same operation is repeated again from step 51 until the data for one file of the data file 5 is recorded. Therefore, the contents of the RAM 4 are updated every time step 56 is repeated.

When the data recording is completed in this way, the process proceeds to step 58. In step 58, the _first track D _{1 of} directory D
To seek the optical head 8, at step 59 in accordance with a format described above, each recording predetermined data in each area 11a~11d of head track D _1. At this time, the temporary EOT track number saved in the RAM 4 is recorded in the EOT address area 11c as the EOT address.

FIG. 6 is a flowchart showing an EOT detection method when the optical card C, which has already been recorded in the sequence of FIG. 5, is newly loaded in the recording / reproducing apparatus.

First, in step 60, all directories D of the card C are read. In a system that manages files by directories, the file structure can be known by first reading all the directories.

In step 61, the pulse motor 7 seeks the optical head 8 to the EOT position recorded in the EOT address area 11c of the last directory of the directories read in step 60. At this time, the accuracy of the pulse motor 7,
Due to the dimensional accuracy of the optical card C, the deviation at the time of pulling in the automatic tracking (AT), etc., a slight error occurs between the seek position of the optical head 8 and the actual EOT position.

Also, after writing the last directory, when writing new data to the data track by a new recording command, a recording error occurs due to dust adhering to the recording medium, a defect in the recording medium, etc. If the recording medium is ejected from the apparatus, the directory for the data being recorded is not recorded and the recording ends. Then, when the same optical card C is set again in the apparatus to record data, when reading all directories and detecting EOT, the directory for the data in the middle of the previous recording is not recorded as described above. Further, the directory for the previous data is recognized as the last directory, and the optical head 8 is sought to the EOT position stored in the directory. Therefore, also in this case, the position of the seek optical head 8 and the actual EOT are different. So step 62
After that, the EOT stored in the directory is the actual EOT.
I am trying to confirm whether or not it is. That is, in this embodiment, when the data is not recorded continuously for 5 tracks from the track on which the data is recorded, the track is set to EOT.

First, in step 62, the AT is pulled in at the position where the optical head 8 was sought in step 61, and reproduction of one data track and detection of the V mark are performed.

In step 63, it is judged whether or not the data is recorded on the data track, and if it is recorded, the step 65
After that, if not recorded, the light beam is moved to the previous data track in step 64, and the process is repeated from step 62.

In step 65, it is checked whether or not the reproduced data track has a V mark, and if there is, the track number of that track is saved in the RAM 4 in step 66 and the step is performed.
Proceed to 67, and if there is none, jump directly to step 67.

In step 67, the light beam is moved to the next data track, and in step 68, that data track is reproduced.

In step 69, it is determined whether or not the data is recorded on the track. If it is recorded, the same operation is repeated from step 65. If it is not recorded, the process proceeds to step 70, and the track in which the data is not recorded is determined. It is determined whether or not 5 tracks are continuous. If the number of tracks on which no data is recorded is 5 tracks or less, the light beam is moved to the next data track in step 71 and the process returns to step 68 to repeat until 5 tracks are detected.

If it is detected in step 70 that there is no data on 5 consecutive tracks, the track number saved in RAM4 is EO.
Judge as T, and end the EOT detection process.

When adding data to the data track of the optical card,
The optical head may be sought to the track next to the EOT detected in this sequence, and additional recording of data may be executed from step 51 of FIG.

In this embodiment, the number of tracks in which data is not continuously recorded is set to "5", but the reference value of the number of tracks in which data is not continuously recorded is such as the reliability or throughput of the system. Since it is determined by, it may be set based on that.

[Effects of the Invention] As described in detail above, according to the present invention, whether or not a data-recorded track is detected by scanning the track and reading recorded information, and by this detection, a plurality of data-unrecorded tracks are detected. When it is confirmed that the data is recorded continuously, the data is recorded from the first unrecorded data track, so when recording additional data, it is possible to accurately search the recorded final track and record it as a result. It is possible to prevent double recording on a track and to successively record from the side next to the previously recorded track, and it is possible to use the recording track without wasting it. Further, since the tracks are scanned to detect the unrecorded tracks, there is an advantage that it is possible to accurately detect whether or not the information is recorded on the tracks even if there is a defect in the middle of the tracks. Furthermore, the last position of the recorded track can be detected without recording the data indicating the final position such as the END mark as in the conventional case. Therefore, it is not necessary to additionally provide a device for recording and erasing the END mark, and waste of recording space can be saved.

Further, in a medium such as an optical card or an optical disc in which the intervals between recording tracks are small, auto-tracking control is required. However, during recording, a track jump may occur due to an external impact or the like. In this case, an unrecorded track will enter between the recorded tracks,
Even in such a state, according to the present invention, the last position of the recorded track is detected by detecting that a predetermined number of unrecorded tracks are continuous and detecting the last position of the recorded track. The detection can be reliably performed.

[Brief description of drawings]

FIG. 1 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, and FIG. 2 is a schematic plan view of the optical card, FIG. 3 (A) and (B) is a diagram showing a data format of a data track and a directory of the optical card, FIG. 4 is an enlarged view of a main data recording section of the optical card, and FIGS. 5 and 6 show the operation of FIG. It is a flow chart for explaining. C: Optical card M: Main data recording unit 1 ... Bus 2 ... Central processing unit (CPU) 3 ... Program memory 4 ... Working area 5 ... Data file 6 ... Recording / reproducing circuit 7 ... Pulse Motor 8: Optical head

Claims (1)

[Claims] 1. A data recording method for recording data on a recording medium having a plurality of tracks by using a recording / reproducing head, wherein a series of data is sequentially recorded on the recording medium, and after the series of data is recorded. In the case where the index information including the position information of the recorded last track is written in an area on the recording medium different from the area in which the data is recorded, and other data is additionally written after the already recorded data, The index information is read out, and based on this information, the recording / reproducing head is sought to the last track, and the track is sequentially read from the track next to the sought track to determine whether the track is a data-recorded track, and the record information is read out. If it is confirmed by the detection that a plurality of data unrecorded tracks are continuous, A data recording method, characterized in that data is recorded from the data unrecorded track detected first in the data unrecorded track.