JPH0684271A - Recorder - Google Patents

Abstract

PURPOSE:To prevent recorded data from being destroyed by track jump and to efficiently execute a re-recording operation by speedily detecting the track jump, immediately stopping a data recording operation and performing re- recording by using prescribed data recorded in a buffer memory. CONSTITUTION:At the time of the recording operation, a system controller 11 searches an unrecorded area corresponding to the data of a TOC 21 according to the operation of an input part 19 by user, provides guard bands GB before and behind the area and starts recording through a RAM 13. At such a time, when the count value of a traverse signal in a servo circuit 9 exceeds a prescribed value, the generation of the track jump is judged, and the recording operation is immediately stopped. Then, an absolute position after the track jump is detected, and a position to start re-recording is judged. Thus, the recorded data are surely prevented from being destroyed, and data recovery processing can be efficiently performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus capable of recording data such as music on a disc-shaped recording medium.

[0002]

2. Description of the Related Art Data rewritable disc media on which a user can record music data and the like are known. In such disc media, areas such as already recorded data such as music and unrecorded areas are known. A data area (user TOC) for managing the data is provided, and this management data is also rewritten each time the recording operation is completed. Then, for example, when trying to record a certain piece of music, the recording device searches the user TOC for an unrecorded area on the disc and records the audio data there.

By the way, in recordable disc media such as magneto-optical discs (MO discs), DA
Random access is extremely easy as compared with tape-shaped recording media such as T and compact cassette tapes. Therefore, for example, one music piece is always a continuous segment (note that physically continuous data is recorded with a segment). It does not need to be recorded in a track portion), and there is no problem even if the data is recorded in a plurality of segments discretely on the disc. In other words, if the recording / reproducing operation and the high-speed access operation in the segment are repeated, even if the track of one music is divided into a plurality of segments and physically divided, there is no problem in recording / reproducing of the music. can do.

For example, as shown in FIG. 10, the first music piece is continuously recorded as a segment T ₁ and the second music piece is recorded as a segment T _2. However, as the fourth music piece and the fifth music piece, segments T _{4 ( 1) to} T _{4 (} T ₎ are recorded. It is also possible to divide and record on a track as indicated by _{4 (4)} and T _{5 (1) to} T _{5 (2)} . (Note that FIG. 10 is merely a schematic diagram, and in practice, one segment often covers several to several hundred tracks or more.)

When recording or erasing music on a magneto-optical disk is repeated, vacant areas on the tracks are irregularly generated due to the difference in the playing time of the recorded music or the playing time of the erased music. By executing the discrete recording in this way, it becomes possible to record, for example, a music longer than the erased music by utilizing the erased portion, and by repeating recording / erasing, the data recording area Waste is eliminated. It should be noted that what is recorded is not necessarily a "song" and any audio signal is included, but in the present specification, a piece of data that is continuous in terms of content is referred to as a "song". To do.

Of course, for such a disk medium, recording is continued while accessing a plurality of unrecorded areas during recording, and one music is reproduced correctly and continuously during reproduction. The segment must be accessed. A segment within one song (eg T _{4 ( 1)}
The data for concatenating ~ T _{4 (4)} ) and the data indicating the unrecorded area are held as the user TOC information rewritten for each recording operation or erasing operation as described above. By reading this user TOC information and accessing the head, the recording / reproducing operation is properly controlled.

[0007]

By the way, when data is being recorded in an unrecorded area, a track jump may occur due to the influence of vibration or shock. For example, considering a case where there is a recording area REA where data is recorded in the past before and after the unrecorded area FRA as shown in FIG. 11A, in the present recording operation, a section from address A ₁ to address A ₂ In this case, the recording head (optical head and magnetic head) may be scanned. However, due to the influence of vibration or shock applied to the device, the recording head is moved by a track jump as shown by a dotted line TJ in FIG. May leave the unrecorded area FRA and move to the recording area REA where data has already been recorded. In this case, the recorded data in the past will be destroyed (the part of DS in the figure), and this data cannot be recovered again. Therefore, if a track jump occurs, the recording operation (laser light high It is preferable to interrupt the level output and the magnetic field application).

In order to detect a track jump, absolute position information recorded as a pregroove (wobbling groove) on the disc is detected, the continuity is monitored, and a track jump is detected when the continuity is interrupted. Although it can be detected accurately, a few track jumps may already occur during the time delay until the reflected light information from the pregroove is decoded as absolute position information. , This detection method is not enough.

Further, if the traverse signal obtained when the laser spot crosses the track is monitored, the occurrence of the track jump can be detected quickly. However, the traverse signal is actually on the disc other than at the time of the track jump. It may occur due to the influence of dust, etc., and it is difficult to distinguish this, so accuracy is lacking. Of course, in order to prevent data destruction, if there is a possibility of a track jump, it is necessary to interrupt the recording operation immediately, but it is likely that recording was interrupted often including traverse signals due to the influence of dust etc. There is a problem that the recording efficiency is lowered and it is not practical. In particular, when dubbing recording music input from another source device, the recording operation may not be in time for the signal input.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and prevents the recorded data from being destroyed by a track jump at the time of recording, and improves the recording efficiency. (EN) Provided is a recording device which can be improved and, when a track jump actually occurs and a recording error or data destruction occurs in the area currently being written, an appropriate re-recording operation is executed. With the goal.

Therefore, the jump track number detecting means for detecting the jump track number with respect to the track on the recording medium of the recording head, the counting means for counting the detected jump track number, and the predetermined track number as a reference value are used. When the data is recorded, the comparing means compares the reference value with the count value by the counting means, the buffer memory means which can hold the recording data for a predetermined time even after recording the data, and the comparing means, the comparing value is larger than the reference value. When a count value is detected, a track jump detecting means is determined to determine that a track jump has occurred, and when a track jump is detected by the track jump detecting means at the time of data recording, the data recording operation is stopped and the record data held in the buffer memory means is recorded. To perform the re-recording operation using Constituting the recording apparatus and a control means capable of.

Further, in this recording apparatus, the control means, if a track jump is detected during data recording,
In addition to stopping the data recording operation, the address information after the track jump is read to determine the track jump direction. If the track jump is to the inner circumference side of the disc, the address information immediately before the address information after the track jump is included. Control is performed to start the re-recording operation from the recording unit (cluster), and to start the re-recording operation from the recording unit (cluster) including the address information immediately before the track jump in the case of a track jump to the disc outer peripheral side. To do so.

[0013]

For example, when writing data in a continuous unrecorded area where data should be recorded, the data recording formed at the front end portion, the rear end portion, or both the front end portion and the rear end portion in the unrecorded area is performed. When a guard band that is not provided is provided, if the number of tracks according to the length of the guard band is used as the reference value, the traverse signal detection may be due to the effect of dust on the disc or the actual track jump. Even if a track jump occurs on a small number of tracks (for example, within 2 tracks) that cannot be distinguished due to
The recording head does not move from the unrecorded area to the previously recorded recording area, and the past recording data is not destroyed. Of course, if it is a traverse signal due to dust, it is sufficient to continue recording as it is. That is, in such a case, it is not necessary to interrupt the recording operation one by one. The data that is actually destroyed even if it is a track jump is the data immediately after being written in the current recording operation, and in most cases, it can be recovered by rewriting.

Further, a track jump of a large number of tracks (for example, three tracks or more) in which the optical head may move to the recording area can be detected almost accurately and quickly by the traverse signal. In this case, if the recording operation is interrupted immediately, the unrecoverable destruction of the past data can be prevented.

In other words, the track jump detecting operation for determining whether or not rewriting is performed is performed by comparing the count value of the traverse signal with the reference value, and when the track jump of the number of tracks equal to or larger than the reference value occurs. Only when the track jump occurs, the most accurate detection operation is performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the recording apparatus of the present invention will be described below. First, the structure of the recording / reproducing apparatus according to the embodiment will be described with reference to FIG. 1, and then the recording / reproducing apparatus will be described with reference to FIGS. The segment management data written as user TOC information on the magneto-optical disc corresponding to
Then, the operation of this embodiment will be described.

This embodiment is a recording / reproducing apparatus using an MO disk as a recording medium, and FIG. 1 shows a block diagram of a main part of the recording / reproducing apparatus. In FIG. 1, reference numeral 1 denotes, for example, a magneto-optical disk on which a plurality of music pieces (audio data) are recorded, which is rotationally driven by a spindle motor 2. Three
Is an optical head that irradiates the magneto-optical disk 1 with laser light at the time of recording / reproducing, provides a high level laser output for heating the recording track to the Curie temperature at the time of recording, and reflects by the magnetic Kerr effect at the time of reproducing. It provides a relatively low level laser power for detecting data from light.

For this reason, the optical head 3 is equipped with a laser diode as a laser output means, an optical system including a deflecting beam splitter, an objective lens and the like, and a detector for detecting reflected light. The objective lens 3a is 2
It is held by a shaft mechanism 4 so as to be displaceable in the disk radial direction and the direction in which it comes in and out of contact with the disk, and the entire optical head 3 is movable by a thread mechanism 5 in the disk radial direction.

Reference numeral 6 denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, which is arranged at a position facing the optical head 3 with the magneto-optical disk 1 in between.

The information detected from the magneto-optical disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 calculates the supplied information by reproducing RF signals, tracking error signals, focus error signals, and absolute position information (absolute position information recorded as pregrooves (wobbling grooves) on the magneto-optical disk 1). Address information, subcode information,
The focus monitor signal and the like are extracted. Then, the extracted reproduction RF signal is supplied to the encoder / decoder unit 8. The tracking error signal and the focus error signal are supplied to the servo circuit 9, and the address information is supplied to the address decoder 10 and demodulated. Further, the focus monitor signal is supplied to the system controller 11 configured by, for example, a microcomputer.

The servo circuit 9 generates various servo drive signals according to the supplied tracking error signal, focus error signal, track jump command, seek command, rotational speed detection information from the system controller 11, etc., and the biaxial mechanism 4 and The sled mechanism 5 is controlled to perform focus and tracking control, and the spindle motor 2 is controlled to a constant angular velocity (CAV) or a constant linear velocity (CLV).

The reproduced RF signal is supplied to the encoder / decoder section 8
Then, the EFM demodulation and the decoding process such as CIRC are performed, and the data is temporarily written in the buffer RAM 13 by the memory controller 12. The reading of data from the magneto-optical disk 1 by the optical head 3 and the reproduction data transfer from the optical head 3 to the buffer RAM 13 are performed at 1.41 Mbit / sec.

The data written in the buffer RAM 13 is read out at the timing when the reproduction data is transferred at 0.3 Mbit / sec, and is supplied to the encoder / decoder section 14. Then, a reproduction signal process such as a decoding process for the audio compression process is performed, an analog signal is formed by the D / A converter 15, and the analog signal is supplied from a terminal 16 to a predetermined amplification circuit section and reproduced and output. For example, it is output as L and R audio signals.

The absolute position information obtained by decoding the pregroove information output from the address decoder 10 or the address information recorded as data is transmitted via the encoder / decoder unit 8 to the system controller 1
1 and is used for various control operations. further,
The lock detection signal of the PLL circuit that generates the bit clock for the recording / reproducing operation and the monitor signal of the missing state of the frame synchronization signal of the reproduction data (L and R channels) are also supplied to the system controller 11.

When the recording operation is performed on the magneto-optical disk 1, the recording signal (analog audio signal) supplied to the terminal 17 is converted into digital data by the A / D converter 18, and then the encoder. / It is supplied to the decoder unit 14 and subjected to audio compression encoding processing. The recording data compressed by the encoder / decoder unit 14 is temporarily buffered by the memory controller 12 in the buffer RAM 1
3 is read out at a predetermined timing and sent to the encoder / decoder unit 8. Then, the encoder / decoder unit 8 performs CIRC encoding, EFM modulation, and other encoding processing, and then supplies the magnetic head driving circuit 15.

The magnetic head drive circuit 15 supplies a magnetic head drive signal to the magnetic head 6 according to the encoded recording data. That is, the N or S magnetic field is applied to the magneto-optical disk 1 by the magnetic head 6. Further, at this time, the system controller 11 supplies a control signal to the optical head 3 so as to output a laser beam of a recording level.

Reference numeral 19 denotes an operation input section provided with keys used for user operation, and 20 denotes a display section composed of, for example, a liquid crystal display. The operation input unit 19 is provided with a record key, a play key, a stop key, an AMS key, a search key, etc. so that the user can operate them.

Reference numeral 21 is a RAM (hereinafter referred to as TOC memory) for holding TOC information in the magneto-optical disk 1. At the time when the magneto-optical disk 1 is loaded or immediately before the recording or reproducing operation, the system controller 11 drives the spindle motor 2 and the optical head 3 to set the TOC on the innermost side of the magneto-optical disk 1, for example. Let the area data be extracted. Then, via the RF amplifier 7 and the encoder / decoder unit 8, the system controller 1
The TOC information supplied to No. 1 is stored in the TOC memory 21, and is used for controlling the recording / reproducing operation for the magneto-optical disk 1 thereafter.

In particular, in such a recordable disc medium, segment management data for recording / reproducing one music piece as one or a plurality of divided segments as described above is recorded. That is, in order to manage the recorded data area, the contents of the user TOC area (hereinafter,
U-TOC) is provided and has a data structure as shown in FIG. 2, for example.

This U-TOC is composed of, for example, a data area of 4 bytes x 587, and a header having a sync pattern formed of 1-byte data of all 0s or alls 1 at the head position to indicate that it is a U-TOC area. Is provided. The song number of the first song recorded (First TNO) and the song number of the last song (Last
Data such as TNO), sector usage, disk ID, etc. are recorded. Furthermore, an area is provided in which various correspondence table instruction data (P-DFA to P-TNO255) that associates each recorded music piece with a management table described later is recorded.

On the other hand, 255 parts tables (01) to (FF) are provided as a management table, and each part table has a start address as a starting point and an end address as an ending point for a certain segment. To be able to record the mode information of a segment (track), and link information indicating the parts table in which the start address and end address of the connected segment are recorded when the segment is subsequently connected to another segment. Has been done.

The track mode information is recorded with information as to whether the segment is set to overwrite inhibition or data copy inhibition, whether it is audio information, or monaural / stereo type. The link information is, for example, the number (0
Parts tables to be linked are specified by 1) to (FF). That is, in the management table, one parts table represents one segment, and for example, 3
For a piece of music composed by connecting one segment, the segment position is managed by three parts tables linked by link information. In addition,
Therefore, the numbers (01) to (FF) that are the numbers of the parts table can be directly used as the segment numbers.

Each of the parts tables (01) to (FF) in the management table corresponds to corresponding table instruction data (P-DFA to P-DF-
TNO255) indicates the contents of that segment.

The P-DFA is shown for a defective area on the magneto-optical disk 1, and a part table or a plurality of parts tables in which a track portion (= segment) that becomes a defective area due to a scratch or the like is shown. The top part table is specified. In other words, if there is a defective segment, (01) to (FF) in the correspondence table instruction data P-DFA
One of these is recorded, and the defective segment is indicated by the start and end addresses in the corresponding parts table. Further, when there is another defective segment, another part table is designated as the link information in the part table, and the defective segment is also shown in the part table. Then, if there is no other defective segment, the link information is, for example, "(00)", and thereafter there is no link.

P-EMPTY indicates the top part table of one or a plurality of unused part tables in the management table. If there is an unused part table, the corresponding table instruction data P-EMPTY is (01) ~
Any one of (FF) is recorded. Corresponding table instruction data when there are multiple unused parts tables
The parts table is sequentially specified by the link information from the parts table specified by P-EMPTY, and all unused parts tables are linked on the management table.

For example, in the case of a magneto-optical disk which is not recorded at all and has no defect, since the parts table is not used at all, the corresponding table instruction data P-EM is used.
The part table (01) is specified by the PTY, and the part table (0) is used as link information for the part table (01).
2) is specified, the part table (03) is specified as the link information of the parts table (02), and so on, and the parts table (FF) is linked. In this case, the parts table (F
The link information of F) will be “(00)” indicating no connection thereafter.

The P-FRA is shown for an unrecorded area (including an erased area) of data on the magneto-optical disk 1. One or a plurality of track portions (= segments) to be the unrecorded area are shown. The first parts table in the parts table is specified. That is, if there is an unrecorded area, any one of (01) to (FF) is recorded in the correspondence table instruction data P-FRA, and the corresponding part table has an unrecorded segment start and It is indicated by the end address. Also, if there are multiple such segments, that is, if there are multiple parts tables, the link information indicates that the link information is "(00)".
The parts table is specified in order.

FIG. 3 schematically shows the management state of the segment which becomes the unrecorded area by the parts table. This is because when the segment (03) (18) (1F) (2B) (E3) is an unrecorded area, this state continues to the corresponding table instruction data P-FRA and the parts table (03) (18) (1F). ) (2B) (E3) shows the state represented by the link. The defective area and the unused parts table management mode described above are the same.

P-TNO1 to P-TNO255 indicate respective music pieces recorded on the magneto-optical disk 1. For example, in the correspondence table instruction data P-TNO1, one or a plurality of data pieces of the first music piece are recorded. A parts table indicating the temporally first segment of the segments is specified.

[0040] For example, the first song is not divided into tracks on the disc (that is, one segment)
When recorded, the recording area of the first music piece is recorded as the start and end addresses in the parts table indicated by the corresponding table instruction data P-TNO1.

Further, for example, when the second music piece is discretely recorded in a plurality of segments on the disc, each segment is designated in a temporal order in order to indicate the recording position of the music piece. In other words, from the parts table specified in the correspondence table instruction data P-TNO2, further parts tables are sequentially specified by the link information according to the temporal order, and the parts table in which the link information is "(00)" is linked. (The above-mentioned form similar to FIG. 3). In this way, for example, all the segments in which the data constituting the second music piece is recorded are sequentially designated and stored, so that the U-TOC data is used to reproduce the second music piece or to the area of the second music piece. When overwriting is performed, it becomes possible to access the optical head 3 and the magnetic head 6 to take out continuous music information from discrete segments, and to perform recording using the recording area efficiently.

The recording / reproducing apparatus of this embodiment for the magneto-optical disk 1 on which such U-TOC data is recorded is as follows:
Using the U-TOC data read into the TOC memory 21, the recording area on the disc is managed to control the recording / reproducing operation. In particular, during the recording operation, the unrecorded area on the disc is searched for from the U-TOC data and the data is recorded there, but when the recording area is adjacent before or after the unrecorded area. Is to form a guard band in which no data is recorded at the front end and / or the rear end of the unrecorded area. Then, a criterion for determining whether or not a track jump has occurred during recording is set according to the length of the preset guard band so that the re-recording operation can be efficiently executed. The operation during recording will be described below with reference to FIGS.

In the recording track of the magneto-optical disk 1, as shown in FIG. 4, a cluster CL (= 36 sectors-) consisting of 4 sectors (1 sector = 2352 bytes) of sub data area and 32 sectors of main data area is continuous. And one cluster is the minimum unit for recording. One cluster corresponds to 2 to 3 rounds of tracks. The address is recorded for each sector.

Here, as shown in FIG. 5, the segment of addresses A ₁ -A ₂ including a plurality of clusters CL ₁ -CL ₉ is assumed to be an unrecorded area FRA, and the areas before and after it are recorded areas. Assume that it is REA. The addresses A ₁ and A ₂ are the start address and the start address in the parts table specified in the corresponding table instruction data P-FRA as U-TOC data (or in any of the parts tables linked by the link information from the parts table). It is stored as an end address.

Here, in the present embodiment, the recording operation is performed so that the guard band GB in which no data is recorded is formed in a portion adjacent to the recording area REA, for example, with a length of one cluster. In other words, the system controller 11 performs an operation in which the address indicating the recording start position is A ₃ one cluster ahead of the start address A _1, and the address indicating the recording end position is one cluster before the end address A ₂ . The recording area is set by performing the calculation of A _4, and the recording operation is performed. Therefore, the recording head is scanned in the address A _{3 to} A ₄ section as indicated by H ₁ in the figure. Therefore, the clusters CL ₁ and CL ₉ become the guard band GB in which no data is recorded.

The system controller 11 detects the traverse signal in the servo circuit 9 to generate the track jump. The traverse signal is generated every time the laser spot crosses the track, so by counting the traverse signal,
It is possible to determine how many tracks have been crossed. However,
As described above, it may occur due to the influence of dust on the disc. Therefore, when the system controller 11 counts the traverse signals and detects that three or more track jumps have occurred as shown in FIG. 6A, it determines that a track jump has occurred and immediately interrupts the recording operation. Then, if possible, the re-recording operation is performed. For example, when a track jump TJ occurs in the unrecorded area as shown by scanning H ₄ or H _{5 in} FIG. 5, re-recording is often possible.

Further, when two or less traverse signals occur sporadically as shown in FIG. 6B, it is regarded as the influence of dust on the disc, for example, and the recording operation is continued.

Even if two or less traverse signals occur sporadically, even if a track jump of two tracks or less actually occurs, the guard band GB is formed for one cluster (for two to three tracks). Therefore, the scanning state of the recording head in that case is as shown by H ₂ or H _{3 in} FIG. 5, and the recording area RE outside the guard band GB is shown.
It never reaches A. Therefore, it does not reach the destruction of the recorded data in the past. Whether or not it is an actual track jump is accurately determined by checking the continuity of the absolute position information by the pre-groove on the disk, and re-recording or the like is taken when the track jump is performed.

FIG. 7 is a flow chart showing a recording process of the system controller 11 which controls such a recording operation. Each step is shown by F101 to F123.
When the magneto-optical disk 1 is loaded, the TOC information is read as described above, and therefore the U-TOC shown in FIG.
Although the data is also stored in the TOC memory 21, the system controller 11 uses the U-TOC data when the user performs a recording operation from the operation input unit 19, as shown in FIG.
The routine is processed.

First, the start address and end address of the unrecorded area FRA are searched from the parts table designated by the corresponding table designation data P-FRA of the U-TOC data (F101, F102). The segment length of the unrecorded area FRA, that is, (end address)
-(Start address) is twice the guard band length (=
It is determined whether it is longer than 2 clusters (F103). if,
If the segment length is equal to or less than twice the guard band length, the unrecorded area FRA becomes unrecordable and the unrecorded area FA
The RA is searched for the next linked parts table from the indicated parts table, and the segment length is calculated from its start address and end address. That is, in steps F101 to F103, an unrecorded area FRA having a segment length> double the guard band length is searched for,
This is the area to be recorded.

When the unrecorded area FRA to be recorded is designated, the guard band G is set to be larger than the start address A ₁ thereof.
The address at the position after the B length (1 cluster) is calculated as the recording start address A ₃ (F104). In addition, an address at a position preceding the end address A ₂ by the guard band GB length (1 cluster) is the recording end address A ₄
Is calculated as (F105).

When the recording start address A ₃ and the recording end address A ₄ are calculated, the recording head is made to access the recording start address A ₃ and data recording is started from the address A ₃ (F106, F107, F108). That is, the recording scan is started as indicated by H ₁ in FIG. 5, and the data supplied to the magnetic head 6 via the buffer RAM 13 is recorded.

During this recording scan, the system controller 11 obtains from the pre-groove on the disc whether the head position has reached the recording end address A ₄ , whether a track jump of three tracks or more is detected by the traverse signal. It is monitored whether discontinuity is detected in the absolute position information (F109, F110, F111).

If the head position reaches the recording end address A ₄ without detecting the discontinuity of the traverse signal or absolute position information for three tracks or more, it is considered that the recording operation for the segment is normally completed. The recording operation for (F109 → F122) is completed, and this unrecorded area FRA becomes the recording area REA. Therefore, the required data of the U-TOC data is changed according to this, and the data on the disc is changed. Processing for rewriting the U-TOC area is performed (F123).

Although a detailed description with the flow chart is omitted, as described above with reference to FIG. 10, in such a magneto-optical disk, data (for example, music) can be recorded over a plurality of segments. Therefore, if all data has not been recorded yet,
The first unrecorded area F, shown as scan H _{6 in} FIG.
The next unrecorded area FRA when recording of RA ₁ is completed
You will continue to record by accessing ₂ . In this case, recording is performed between the addresses A _{3 to} A ₄ so that the guard band GB is similarly formed in the next unrecorded area FRA ₂ . And actually UT
Rewriting of OC data will be collectively executed when recording is completed for one or all of the segments (unrecorded area FRA).

While the data is being recorded in the unrecorded area FRA, the system controller 11 monitors the traverse signal. However, if the traverse signal is within two tracks, it is ignored and the recording operation is continued. When a traverse signal for 3 tracks is detected, it is considered that a track jump has occurred and the recording operation is immediately stopped to prevent data destruction (F110 → F112).

Since there is a possibility that the data has already been destroyed at the time of detecting the occurrence of the track jump, if the data can be restored by re-recording, this is done. Particularly in the case of this embodiment, the guard band GB
As a result, the recording head does not reach outside the unrecorded area FRA where recording is performed this time by a track jump of three tracks. Therefore, for example, the data remaining in the buffer RAM 13 can restore the data in most cases. By performing the recording stop process as described above, data separated by three tracks or more is not destroyed.

Therefore, first, the absolute position information after the track jump is detected (F113), and it is judged from this position information whether the track jump is on the inner side of the disc or on the outer side of the disc (F114).

For example, in the case of a track jump from the cluster CL ₇ to the cluster CL ₅ toward the inner peripheral side of the disc as shown by scanning H _{4 in} FIG. 5, the sector immediately before the sector including the read absolute position information is read. it is considered from the cluster including the sector (CL ₄ or CL ₅₎ and data destruction has occurred, the previous cluster (CL ₄ or CL
₅ ) is calculated (F115). Meanwhile, the cluster having the sectors corresponding to the cluster from the CL ₃ when was the track jump to the disk outer circumferential side, the absolute position information detected last before the track jump occurs as indicated as scan H ₅ in FIG. 5 ( because an error in the data recording from CL ₃₎ is considered to have occurred, to calculate the cluster (CL ₃₎ containing absolute position information before the track jump (F 116).

Incidentally, even when a traverse signal within two tracks is detected, a track jump may actually occur and a recording error or data destruction may occur in the unrecorded area FRA where recording is currently continued. In the case (for example, as shown by H ₂ or H ₃ in FIG. 5), the continuity of absolute position information is monitored as described above. When discontinuity occurs, it is considered that a track jump has occurred and recording is stopped (F111 → F117). Then, the cluster to start re-recording for data restoration or error elimination is calculated (F118). Here, the cluster to be re-recorded includes a cluster CL including an address immediately before the continuity of absolute position information is interrupted, and a cluster including an address immediately before the address at which the discontinuity of absolute position information is detected. Of CL, the cluster CL is located on the inner peripheral side.

When the cluster to be re-recorded is calculated in any of steps F115, F116 and F118, it is determined whether the data recorded from that cluster to the cluster where the track jump has occurred are still in the buffer RAM 13. Determine (F119). If it does not remain, data recovery by re-recording is impossible, so the process ends as a recording error (F120), but if it remains, the calculated start address of the cluster is set as the recording start address, and the Restart data recording from cluster (F121
→ F106).

By the above processing, the guard band GB is formed in the unrecorded area FRA to perform the recording operation, and at the same time, the track jump does not cause the recording head to enter the other area due to the guard band GB. If the possibility of is detected, this is not immediately considered as a track jump. Then, the recording operation is continued until the track jump is accurately confirmed due to the discontinuity of the absolute position information. That is, the recording will not be interrupted by an incorrect traverse signal due to dust or the like. Further, when a track jump occurs, the data recovery process and the subsequent recording operation are immediately executed.

In the process of this flowchart, the guard band GB is formed in all the unrecorded areas FRA in which the recording operation is executed. However, actually, the recording areas REA are formed before and after the unrecorded areas. When they are not adjacent to each other, it is not always necessary to provide the guard band GB. Further, it is preferable not to provide the data because more data can be recorded.

Therefore, it is preferable that the processes of steps F101 to F105 in FIG. 7 are steps F201 to F217 in FIG. That is, when the unrecorded area FRA is found at the start of recording (F201, F202), first, it is determined whether or not both adjacent areas before and after the area are the recording area REA (F20).
3). If the recording area REA is in the front and rear,
Similarly, it is determined whether the segment length is longer than twice the guard band length (2 clusters) (F204), and if longer, it is determined that the area is a recordable area and the flags F _F and F _R are turned on ( F205).

When both the front and rear of the extracted unrecorded area FRA are not the recording area REA, it is determined whether one of the front and rear is the recording area REA (F206), and one is the recording area REA. In this case, since it is sufficient to provide the guard band GB on only one side, it is determined whether the segment length is longer than the guard band length (1 cluster) (F20
7). If it is longer than the guard band length, it is determined that the recording area is a recordable area REA (F208). If the recording area is before, the flag F _F is turned on and the flag F _R is turned off. (F209). If the rest is the recording area, the flag F _F is turned off and the flag F _R is turned on.
(F210).

Furthermore, if neither the front nor the rear is the recording area REA, it is not necessary to provide the guard band GB, and it is assumed that the areas are recordable as they are, and the flags F _F and F are set.
Turn off _R (F211).

If the flag F _F is on,
The recording start address (A ₃ ) is set to the start address A ₁ so that the guard band GB is formed at the front end of the segment.
Address with guard band length added to (F212
→ F213). On the other hand, when the flag F _F is off, the start address A ₁ is used as it is as the recording start address (F212 → F214). That is, in this case, the guard band GB is not formed at the front end portion of the unrecorded area FRA.

When the flag F _R is on, the recording end address (A ₄ ) is the position obtained by subtracting the guard band length from the end address A ₂ so that the guard band GB is formed at the trailing end of the segment. Address (F215
→ F216). On the other hand, when the flag F _R is off, the end address A ₂ is used as it is as the recording end address (F215 → F217). That is, in this case, the guard band GB is not formed at the rear end of the unrecorded area FRA.

Thereafter, the process proceeds to step F106 in FIG. 7 and the above-mentioned operation is executed. As a result, the recordable area can be effectively used.

Although the embodiments have been described above, in some cases, the guard band is provided at one of the front end portion and the rear end portion of the unrecorded area regardless of whether the adjacent area is the recording area REA. Can also be considered.

Further, the track jump is discriminated by the traverse signal in three or more tracks, which is decided in correlation with the setting of the guard band length.
If the guard band length is long, it may be determined that a track jump has occurred for the first time, for example, with a traverse signal for four or more tracks. In other words, a traverse signal with the number of track jumps that does not leave the segment being recorded due to the guard band length is regarded as a detection error due to dust, etc. This is because the recorded data will not be destroyed. By thus setting the guard band length and the track jump detection reference while correlating with each other, the efficiency of the recording operation is improved,
The accuracy and speed of track jump detection for preventing the destruction of past data can be obtained, and thereby the destruction of recorded data can be reliably prevented.

By the way, the present invention can be applied even when a recording method in which a guard band is not provided in an unrecorded area is adopted. In this case, the past data may be destroyed even with a small track jump of, for example, two tracks or less. For example, a predetermined amount of data in the adjacent recording area (for example, one cluster) immediately before the recording operation. By reading in, it becomes possible to recover data by the re-recording operation. In this way, by performing the track jump detection as in the above embodiment, it is possible to prevent the irrecoverable destruction of the recorded data and improve the efficiency of the recording operation.

In the above embodiment, the example in which the present invention is adopted in the recording / reproducing apparatus has been described, but it may be a recording-only apparatus. Further, the present invention can be applied not only to the magneto-optical disc but also to a recording device corresponding to a recordable optical disc.

[0074]

As described above, according to the present invention, when data such as music is recorded in the unrecorded area, the guard band is formed at the front end portion and / or the rear end portion thereof. Therefore, it can be considered that the track jump occurs when the traverse signal detects more than a predetermined number of track jumps according to the guard band length, and the track jump detection for preventing the past record data destruction is accurate. Moreover, it becomes possible quickly. Also,
When a track jump is detected by a traverse signal smaller than a predetermined number, it is not necessary to stop the recording operation one by one by regarding this as an erroneous detection. Therefore, it is possible to reliably prevent the destruction of the past data due to the track jump at the time of recording, and to improve the efficiency of the data recording operation.

Further, when a track jump occurs, it is determined whether the track jump is to the inner circumference side of the disc or the outer circumference side of the disc, and to determine the position at which re-recording should be started. There is also an effect that wasteful re-recording operation is eliminated and efficient data recovery processing is executed.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a data structure of user TOC information read by the recording / reproducing apparatus of the embodiment.

FIG. 3 is an explanatory diagram of a segment management state based on correspondence table instruction data and a parts table.

FIG. 4 is an explanatory diagram of a track structure of a recording medium for an example.

FIG. 5 is an explanatory diagram of a recording operation according to the embodiment.

FIG. 6 is an explanatory diagram of a traverse signal in the example.

FIG. 7 is a flowchart showing a recording operation of the embodiment.

FIG. 8 is a flowchart showing a recording operation of the embodiment.

FIG. 9 is an explanatory diagram of a recording operation over a plurality of segments according to the embodiment.

FIG. 10 is an explanatory diagram of a disc medium capable of recording one music piece in discrete segments.

FIG. 11 is an explanatory diagram of a conventional recording operation.

[Explanation of symbols]

 1 Magneto-optical disk 3 Optical head 6 Magnetic head 8,14 Encoding / decoding section 10 Address decoder 11 System controller 12 Memory controller 13 Buffer RAM 21 TOC memory

Claims (2)

[Claims] 1. A jump track number detecting means for detecting a jump track number for a track on a recording medium of a recording head, a counting means for counting the jump track number detected by the jump track number detecting means, and data recording. When writing data in a continuous unrecorded area to be recorded, using a predetermined number of tracks as a reference value, a comparison means for comparing the reference value with the count value of the counting means at the time of data recording, and recording data at the time of data recording Buffer memory means capable of holding for a predetermined time even after recording, track jump detecting means for judging a track jump when a count value larger than a reference value is detected by the comparing means, and the track during data recording. Track jump is detected by jump detection means Et al., The data recording operation is stopped, the recording apparatus characterized by and a control means capable of executing a re-recording operation by using the recording data held in the buffer memory means. 2. The control means, when a track jump is detected by the track jump detection means at the time of data recording, stops the data recording operation, reads address information after the track jump, and determines the track jump direction, If it is a track jump to the inner side of the disc, the re-recording operation is started from the recording unit including the address information immediately before the address information after the track jump, and if the track jump is to the outer side of the disc, The recording apparatus according to claim 1, wherein the recording device is controlled to start the re-recording operation from a recording unit including address information immediately before the jump.