JPH0945012A - Recording device, reproducing device, and tape-shaped recording medium - Google Patents

Abstract

(57) Abstract: A recording device and a reproducing device capable of performing recording and reproduction with improved reliability of reproduction of recorded data. A subcode adding unit adds a subcode from a subcode generating unit to recording data that is index-added by an index adding unit and error-correction coded by an ECC coding unit, and the same. To the magnetic heads Hw1 and Hw2 via the header parity adding unit 25 to the amplifier 29. Further, the system controller 63 reads from the buffer 47 so that the reproduction data of the recording track having the smaller number of occurrences of the syndrome detected by the syndrome detection unit 61 is output from the redundantly reproduced recording data. Control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device, a reproducing device, and a tape-shaped recording medium, which are suitable for being provided in, for example, a digital audio tape recorder device, a data storage device, etc., and can surely record and reproduce data. Regarding

[0002]

2. Description of the Related Art Conventionally, a data storage device for recording data supplied from an information processing device such as a personal computer or a workstation on a magnetic tape is known. In such a data storage device, in order to improve the data recording density, recording is performed on a recording track inclined with respect to the running direction of the magnetic tape by using a rotary head. Further, for the purpose of improving the sound quality and reducing the length of the magnetic tape required for recording, a digital audio tape for recording / reproducing audio as digital data on a recording track inclined with respect to the running direction of the magnetic tape by using a rotary head. Recorder device (hereinafter simply D
Called AT. )It has been known.

In these data storage devices and the like, the recording track is divided into a plurality of blocks, and the so-called product code (parity) is added to the recording data of each block to record. As a result, even if a part of the recording data is lost due to deterioration of the recording medium or the like, it is possible to perform error correction using the parity and reproduce accurate recording data.

[0004]

However, if the parity is simply added and recorded as described above, accurate recording data can be obtained when an error occurs beyond the allowable range of the parity due to deterioration of the magnetic material of the magnetic tape. There is a problem that it cannot be played back.

Therefore, it is possible to record the same recording data on a plurality of magnetic tapes. In this case, however, it is necessary to store a plurality of magnetic tapes for one recording data. There is a problem that management of the magnetic tape becomes complicated.

The present invention has been made in view of the above problems, and an object thereof is to provide a recording apparatus capable of improving the reliability of recording of recording data.

Another object of the present invention is to provide a reproducing apparatus capable of reproducing data surely.

[0008]

A recording apparatus according to the present invention has a recording control means for supplying the recording data to a recording means for recording the recording data on a tape-shaped recording medium in an overlapping manner.

Further, the recording means records the recording data to which the error correction code is added for each predetermined length by the recording control means in an overlapping manner.

Further, the tape-shaped recording medium has a data recording area in which recording data is recorded and an identification information recording area in which identification information regarding the recording data recorded in the data recording area is recorded. The recording means, when recording the recording data without duplication, records the recording data supplied from the recording control means without duplication in the data recording area,
When recording the recording data in an overlapping manner, the same recording data supplied in duplicate from the recording control means is recorded in the data recording area, and the identification information indicating that the recording data is recorded in duplicate. Is recorded in the identification information recording area.

The reproducing apparatus according to the present invention has a reproducing control means for activating one of the record data reproduced by the reproducing means in duplicate from the tape-shaped recording medium in which the record data is recorded in duplicate.

An error correction code is added to the recording data recorded on the tape-shaped recording medium for every predetermined length. The reproduction control means performs error correction on the record data supplied from the reproduction means based on the error correction code, and validates one of the duplicated record data that has a small number of error corrections when the error correction is performed. And Further, the tape-shaped recording medium has a data recording area in which recording data is recorded and an identification information recording area in which identification information regarding the recording data recorded in the data recording area is recorded, so that the recording data does not overlap. When it is recorded, the identification information indicating that the record data is recorded in the identification information recording area is not recorded. When the record data is recorded in the data recording area, the identification information is recorded. Identification information indicating that the record data is recorded in duplicate in the area is recorded. When the reproduction control means detects that the record data is recorded redundantly based on the identification information reproduced by the reproduction means, the reproduction control means performs error correction on the record data supplied from the reproduction means based on the error correction code. In addition to performing the error correction, the one of the duplicated record data that has a small number of error corrections when performing the error correction is validated, and when it is detected that the record data is recorded without duplication, the error correction processing is performed. All recorded data subjected to is validated.

The tape-shaped recording medium according to the present invention records a data recording area in which recording data is recorded, and duplicate recording identification information indicating whether or not the same recording data is duplicated and recorded in at least the data area. And an identification information recording area.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A case where the recording device and the reproducing device according to the present invention are applied to a data storage device for recording and reproducing data from an information processing device such as a personal computer or a workstation on a magnetic tape will be described below.

This data storage device is, for example, shown in FIG.
As shown in FIG. 2, an interface controller 10 for exchanging data with the outside, and a recording data processing system 2 for performing signal processing on data input via the interface controller 10 and converting the data into a predetermined format.
0, and a recording / reproducing unit 30 for recording the signal supplied from the recording data processing system 20 on the magnetic tape and reproducing the magnetic tape. The data storage device also performs a signal processing on the reproduction output from the recording / reproducing unit 30 to reproduce the data recorded on the magnetic tape, and a tape running system of the recording / reproducing unit 30. And a tracking control system 50 for controlling the recording, and a data recording controller 6 for controlling the recording of data on the magnetic tape.
It has 0 and.

The interface controller 10
Is a so-called SCSI (Small Computor System Interf
data supplied from an information processing device such as an external personal computer or a workstation to the recording data processing system 20 and the recording data reproduced by the reproduction data processing system 40. Supply to.

The recording data processing system 20 includes an index adding section 21 for adding index information to the recording data supplied via the interface controller 10, and a subcode generating section 2 for generating a subcode.
2 and an error correction coding unit (hereinafter referred to as an ECC coding unit) that adds error correction codes, such as C1, C2, and C3 parity, which will be described later, to the recording data from the index adding unit 21 and performs error correction coding. ) 23 and a subcode adding section 24 for adding the subcode and block address from the subcode generating section 22 to the error-correction-coded recording data.

The recording data processing system 20 also includes a header parity adding section 25 for adding a header parity to the recording data from the subcode adding section 24, and a recording data supplied from the header parity adding section 25. 8/10 modulator 2 for 10 modulation (Eight to Ten Moduration)
6, a sync signal adding section 27 for adding a sync signal to the recording data supplied from the 8/10 modulating section 26, and an ATF (Automatic Track) for tracking control to the recording data supplied from the synchronizing signal adding section 27. A pilot signal adding section 28 for adding a pilot signal for Finding),
An amplifier 29 for amplifying the recording data supplied from the pilot signal adding section 28 is provided.

The recording / reproducing unit 30 also includes a rotary drum 31 for rotating two magnetic heads Hw1 and Hw2 having different azimuth angles with respect to the magnetic tape 32. These magnetic heads Hw1 and Hw2 are provided on the circumference of the rotary drum 31 so as to face each other by 180 degrees.

The rotary drum 31 is provided with pulse generators PG1 and PG2 for detecting the rotation thereof, and the recording / reproducing section 30 has a pulse generator PG.
1, pulse generator P provided opposite to PG2
A detection unit 33 is provided which detects passage of G1 and PG2 and detects a PG pulse described later.

The recording / reproducing unit 30 is also provided with a loading mechanism (not shown). This loading mechanism pulls out the magnetic tape 32 and inclines it with respect to the rotary drum 31 when recording / reproducing data. And wrap it around. The winding angle at this time is about 90 degrees.

The reproduction data system 40 includes an amplifier 41 for amplifying the reproduction output of the inclined track of the magnetic tape 32 supplied from the recording / reproducing section 30, and an amplifier 41.
The sync signal is detected from the reproduction output supplied from the device, and the reproduction output is binarized, and then the time-axis correction is performed and output. 8/10 demodulation of reproduced data (Eight to
It includes an 8/10 demodulation unit 43 that performs Ten Demoduration) and a header parity detection unit 44 that detects the header parity of the reproduction data from the 8/10 demodulation unit 43.

Further, the subcode separating section 45 for separating a subcode from the reproduced data from the header parity detecting section 44 and the reproduced data from which the subcode from the subcode separating section 45 has been separated are added to the above-mentioned C1, An error correction processing unit 46 that performs error correction processing using C2 and C3 parity, a buffer 47 that temporarily stores the reproduction data that has been error corrected by the error correction processing unit 46, and reproduction data that is stored in the buffer 47. And an index separating unit 48 that separates the indexes from.

Further, the tracking control system 50 includes a PG detecting section 51 to which a PG pulse is supplied from the detecting section 33 of the recording / reproducing section 30 according to the rotation of the rotary drum 31,
A speed error detecting section 52 for detecting a speed error from the detection output of the PG detecting section 51, a pilot signal detecting section 53 for detecting an ATF pilot signal from the reproduction output of the recording / reproducing section 30, and a speed error detecting section 52. An adding unit 54 that adds the detection outputs of the pilot signal detecting unit 53, a tracking servo circuit 55 that generates a tracking servo signal based on the adding output of the adding unit 54, and the recording / reproducing unit based on the tracking servo signal. And a capstan drive circuit 56 for controlling the tape running system of 30.

Further, the data recording control unit 60 detects the number of times error correction has been performed in the error correction processing unit 46 using the C1, C2, and C3 parities, that is, the number of syndrome occurrences, which is a syndrome detection unit 61.
And a RAM 62 for temporarily storing the number of occurrences of syndromes supplied from the syndrome detection unit 61, and a system controller 63 for controlling reproduction of data based on the number of syndromes from the syndrome detection unit 61 and RAM 62. There is.

Here, in this data storage device,
The magnetic tape 32 is made to run at a predetermined running speed during recording and reproduction. The running speed of this magnetic tape is
The magnetic tape is set so as to travel by two recording tracks during one rotation of the rotating drum. When data is recorded in such a state, one track of each is recorded by the magnetic heads Hw1 and Hw2 while the rotating drum makes one rotation, and as shown in FIG. 2, recording is performed at each track pitch Tp. The tracks T _A and T _B are alternately formed.
Since the magnetic heads Hw1 and Hw2 have different azimuth angles, the recording tracks T _A and T _B have different azimuth angles. Hereinafter, these two recording tracks T _A and T _B will be referred to as one frame.

The recording tracks T _A and T _B are
As shown in FIG. 2, the main data area for recording the recording data and the ATF pilot signal (hereinafter,
It is simply called an ATF signal. ) Is recorded, a sub area for recording sub ID, sub data, etc., and a margin area. The ATF area, the sub area, and the margin area are provided at both ends of the main data area, and one track includes the margin area, the sub area, and the ATF.
The area, the main data area, the ATF area, the sub area, and the margin area are formed in this order.

In this data storage device,
64 blocks of 36 bytes each are recorded in the main data area. Each block is
A 1-byte sync area for recording a sync signal, a 2-byte subcode area for recording a subcode and a block address, a 1-byte header parity area for recording a header parity, and a 28-byte data area for recording data. And a 4-byte parity area in which C1 parity is recorded.

The 28-byte data recorded in this data area is added with error correction codes C2 and C1 having a two-dimensional structure as shown in the data structure of one track in FIG. The error correction code C1 is added to the main data for each block and recorded, and the error correction code C2 is divided into two and recorded at both ends of the main data area of each track.

Here, the C1 parity is a Reed-Solomon code of (32, 28, 5) because 4 bytes of parity is added to 28 bytes of data.
The C2 parity is (32, 28, since the parity of 6 tracks is added to the data of 12 tracks, that is, the data of 26 tracks to the data of 52 tracks.
It is the Reed-Solomon code of 5).

Further, in this data storage device, 2
An error correcting code configuration is adopted in which one track (128 blocks) is defined as one frame and 46 tracks, that is, 23 frames are defined as one unit (group). As shown in FIG. 4, C2 parity of a data string corresponding to the track direction is adopted. Are recorded on both sides of the track, and the C3 parity of the data string corresponding to the track width direction is allocated to the final two tracks of the above-mentioned 46 tracks and recorded. This C
In the case of 3-parity, since 2-track parity is added to 44-track data, (46, 44,
It is the Reed-Solomon code of 3). In addition, index information for identifying a series of data is added to each unit (46 tracks).

As the subcode, a separator count, which is delimiter information indicating a delimiter of main data, a record count indicating the number of records, an area ID indicating each area defined on the tape format, and an absolute position of a recording unit. The frame number shown, the group count showing the number of recording units, the checksum, etc. are recorded.

In this data streamer, as a tape format, as shown in FIG. 5, as a region for loading and unloading a magnetic tape, a physical tape start position ( PBOT: Logical Beginning of Tape (LBOT: Logical Beginning of Tap)
The device area up to e) is specified, and the reference area and the system area are provided next to this device area. The reference area is used as a physical reference when recording a system log (history information) in the system area. A data recording area for recording data is provided next to the system area, and an EOD (EOD: End of Data) area is provided next to the data recording area.

The operation of this data storage device will be described below. In this data storage device, recording data is supplied from an information processing device such as a personal computer or a workstation via the interface controller 10 when recording. When the recording data is supplied via the bus 11, the interface controller 10 supplies the supplied recording data to the index adding section 21 and the sub code generating section 22.

When the recording data is supplied from the interface controller 10, the index adding unit 21 records a series of recording data on the supplied recording data in units of 44 tracks, that is, 22 frames. Index information for identifying data is added and supplied to the ECC encoding unit 23.

The ECC encoding unit 23 generates a C3 parity of a data string corresponding to the track width direction for each unit of the recording data supplied from the index adding unit 21, and uses the C3 parity for the above 22 frames. Added to the recorded data of. The ECC encoding unit 23 also generates C1 parity for each block, adds it to the data of each block, and C2 of the data string corresponding to the track direction.
Parity is generated, and this C2 parity is divided into two and allocated to both ends of the main data area of each track.

On the other hand, the sub-code generator 22 is based on the recording data input via the interface controller 10 and is a separator count which is delimiter information indicating a delimiter of the recording data, a record count indicating the number of recordings, and a tape. An area ID indicating each area defined on the format, a frame number, a group count indicating the number of recording units, a checksum, and a block address of each block are generated. In addition, the subcode generator 22
Generates a system log (history information) of the partition defined as the tape format.

The sub-code adding section 24 adds the block address supplied from the sub-code generating section 22 to the recording data to which the C1, C2 and C3 parities have been added by the ECC coding section 23. Further, the subcode adding unit 24 forms subdata from the count value generated by the subcode generating unit 22, the area ID, the group count, the checksum, etc., and allocates the subdata to each block of the two subregions.

The header parity adding section 25 generates a 1-byte header parity for error detection with respect to the block address added to the recording data by the sub-code adding section 24, and records the 1-byte header parity. Append to data. As a result, the 1-byte header parity is assigned immediately after the block address of each block.

The 8/10 modulator 26 outputs the recording data of the main data area, to which the header parity is added by the header parity adding portion 25, and the recording data of each block of the two sub areas, in units of 1 byte and 8 bits. It is converted to 10 bits so that the DC level of the signal to be recorded is maintained at about 0.

Further, the synchronization signal adding section 27 is configured to
A sync signal is added to the beginning of the recording data converted into 10-bit data by the / 10 modulator 26 for each block. Then, the recording data thus formed is supplied to the pilot signal adding unit 28.

The pilot signal adding section 28 generates an ATF pilot signal, adds the ATF pilot signal to the recording data, and supplies it to the magnetic heads Hw1 and Hw2 via the amplifier 29. As a result, the magnetic head H
The w1 and Hw2 scan the magnetic tape for recording, and the recording track shown in FIG. 2 is formed on the magnetic tape.

Further, in this data storage device, when reproducing the magnetic tape recorded as described above,
The recording / reproducing unit 30 controls the rotation of the rotating drum 31 so that the number of rotations of the rotating drum 31 becomes the same as that at the time of recording, and also runs the magnetic tape 32 so that the magnetic tape 32 runs at a constant speed. Control. As a result, the reproducing recording heads Hr1 and Hr2 scan the magnetic tape while inclining, and the magnetic heads Hr1 and Hr2 output the reproduction output corresponding to the scanning of the recording track to the sync signal detecting unit 42 via the amplifier 41. Supply. The synchronization signal detection unit 42 detects the synchronization signal from the supplied reproduction output, binarizes the reproduction output with a clock synchronized with this synchronization signal, generates reproduction data, and supplies the reproduction data to the 8/10 demodulation unit 43.

The 8/10 demodulator 43 converts the reproduced data from the sync signal detector 42 from 10-bit data to 8-bit data and supplies it to the header parity detector 44. The header parity detection unit 44 performs a parity check of the block address using the above-described one-byte header parity. Then, the sub-code separation unit 45 supplies the data of the block of the main data area having the correct block address that is parity-checked by the header parity detection unit 44 to the error correction processing unit 46, and from the block of the sub-area. The sub-code is separated and supplied to the system controller 63.

Further, the subcode separating section 45 sets the block address of the block in the main data area to the RA
Supply to M62. As a result, the parity corresponding to the block address supplied from the RAM 62 is read and supplied to the system controller 63.

On the other hand, the error correction processing unit 46 uses the C1 parity added to each block to perform error correction processing on the reproduced data of each block from the subcode separation unit 45, and the data of each track. Using the C2 parity added to both ends of the area, error correction processing is performed on the data string corresponding to the track direction, and
An error correction process is performed on the data string corresponding to the track width direction by using the C3 parity assigned to each group 22 frame. Then, the error correction processing unit 46
Supplies the recording data subjected to the error correction processing to the buffer 47.

At this time, the error correction processing unit 46
When there is a correctable error (syndrome) in the data of the reproduced block, the syndrome detection unit 61 is notified that the error correction has been performed using the C1, C2, and C3 parities described above. Then, the syndrome detection unit 61 detects the number of times the syndrome has occurred during the reproduction of blocks for one track and supplies it to the system controller 63.

In this data storage device, since the error correction processing is performed on the reproduced data by using the C1, C2, and C3 parities in this way, it is possible to surely correct the error of the reproduced data and The reliability can be improved.

The index separating section 48 reads the reproduction data for each unit stored in the buffer 47 after being subjected to the error correction processing by the error correction processing section 46 as described above, and separates the index information. Then, the data is supplied to the system controller 70 or the like, the index information is separated, and the reproduction data is supplied to the interface controller 10. Then, the interface controller 10 transmits the reproduction data from the index separating section 48 to a personal computer, a workstation or the like.

By the way, when recording or reproducing as described above, there is a case where a failure such as head clog occurs in only one of the magnetic heads and recording / reproducing cannot be performed at all. In such a case, when different recording data is recorded on each recording track as described above, if three or more recording tracks among the 46 tracks cannot be reproduced, the above C3 parity is set. Even if it is used, accurate recorded data cannot be reproduced.

For this reason, in this data storage device, it is possible to perform multiplex recording in which the same recording data is recorded by the magnetic heads Hw1 and Hw2. In this way, by recording the same recording data by the magnetic heads Hw1 and Hw2, even when a failure such as a head clog occurs in one magnetic head, the other magnetic head records the data in duplicate. The data can be played back.

Further, in this data storage device, the system controller 63 selects whether or not to carry out such multiplex recording, based on the input from the user. The operation when performing such multiple recording will be described below.

In this data storage device, when performing multiplex recording, 11 frames of recorded data, that is, 2
Index information, C1, C for 2 tracks
Recording data for 23 tracks is formed by adding 2, C3 parity and the like, and the recording data for each track is recorded by the magnetic heads Hw1 and Hw2 in an overlapping manner. As a result, when performing multiplex recording, 11
Recording tracks for 23 frames are formed in the data area for the data for the frames.

That is, the system controller 63
When performing multiplex recording, index information, C, for 11 frames, that is, 22 tracks, of the recording data supplied via the interface controller 10 is recorded.
The index addition unit 21, the subcode generation unit 22 and the like are controlled so that 1, C2 and C3 parities are added.

Then, the index adding section 21 is
Index information is added to every 11 frames of the recording data supplied via the interface controller 10 and supplied to the ECC encoding unit 23. The ECC encoding unit 23 receives the 1 supplied from the index adding unit 21.
The above-mentioned C1, C2, and C3 parities are added to the recording data for one frame. As a result, here, the ECC encoding unit 23 generates the same C1 and C2 parities as described above, and the C3 parity differs from the above by 1
Parity for one frame (two tracks) is added to data for one frame (22 tracks). That is, the C3 parity in this case is the Reed-Solomon code of (24, 22, 3).

The (24, 22, 3) Reed-Solomon code has a high possibility of error correction with respect to the above-mentioned (46, 44, 3) Reed-Solomon code. That is, in this data storage device, the possibility of error correction is improved by recording only the recording data in an overlapping manner and recording the C3 parity without overlapping.

On the other hand, the sub-code generator 22 generates the above-mentioned separator count, record count, area ID, frame number, group count, checksum, block address, etc. for the recording data of the above 23 tracks. In addition, the subcode generator 22
The multiple recording identification information indicating that multiple recording is performed is generated for the recording data to be recorded on the recording track of the system area.

The sub-code adding section 24 adds the block address and the like supplied from the sub-code generating section 22 to the recording data to which the C1, C2 and C3 parities have been added by the ECC encoding section 23. Further, the subcode adding section 24 adds the multiplex recording identification information to the recording data to be recorded in the data area. Then, the sub-code adding section 24 outputs the above-mentioned recording data for 22 tracks by duplicating each two times and outputs the above-mentioned 2 data.
Output without overlapping track parity. As a result, the recorded data of 22 tracks is 4
Recording data for 6 tracks is output.

The recording data for 46 tracks formed in this way is similar to the above, and the header parity adding section 25 is used.
The magnetic heads Hw1 and Hw2 are alternately supplied via the amplifier 29. As a result, the same recording data is overlapped and recorded on the adjacent recording tracks T _A and T _B of the data area. In addition, the multiple recording identification information generated by the subcode generating unit 22 is recorded on the recording track of the system area.

In this data storage device, since the same recording data is recorded redundantly as described above, when one magnetic head fails and recording data is not recorded, or when recording data is reproduced. Even if a failure occurs in one of the magnetic heads, accurate recording data can be reproduced by reproducing the recording tracks redundantly recorded by the other magnetic head. As a result, it is possible to perform recording with improved reliability of reproduction of recorded data.

Further, since the multiple recording identification information is recorded on the recording tracks of the system area as described above, it is possible to easily judge whether or not the multiple recording is performed only by reproducing the recording tracks of the system area. can do.

When reproducing the magnetic tape in which the same recording data is redundantly recorded as described above, the system controller 63 extracts the multiplex recording identification information from the recording data in the system area. Based on the multiplex recording identification information, it is determined whether or not multiplex recording is being performed on the magnetic tape currently being reproduced. Then, the system controller 50 causes the buffer 4 so that the recording data reproduced as described above is directly supplied to the index separating unit 48 when the multiple recording is not performed.
Read from 7 is controlled.

On the other hand, when the multiple recording is performed, the system controller 50 determines that the one in which the number of occurrences of the syndrome detected by the syndrome detecting section 61 is small is effective from the recorded data reproduced redundantly. The reading from the buffer 47 is controlled so as to do so.

Here, the magnetic heads Hw1 and Hw2 are
As described above, it is formed to face 180 degrees on the circumference of the rotary drum 31, since the angle winding of the magnetic tape is 90 degrees, the recording track T _A T _B is 6
As shown in (A), it is alternately reproduced every ½ rotation of the rotary drum and reproduced during the ¼ rotation of the rotary drum,
It is supplied to the error correction unit 46 via the amplifier 41 to the subcode separation unit 45.

Further, the syndrome detecting section 61 is
Pulse generators PG1 and PG of the recording / reproducing unit 30
The PG pulse from 2 is supplied. The PG pulses from these pulse generators PG1 and PG2 are generated at the timing when the reproduction by the magnetic heads Hw1 and Hw2 is completed, as shown in FIGS. 6B and 6C, respectively.

The syndrome detection section 61 uses these PGs.
Based on the pulse, as shown in FIG. 6D, a track determination signal indicating whether the recording track to be reproduced is the recording track T _A or T _B is generated, and based on this track determination signal. The recording track of the recording data for which error correction is currently being performed is determined.

The error correction section 46 also performs error correction on the reproduction data of the recording tracks of the recording tracks T _A and T _B , and records them in the buffer 47. Since the same recording data is redundantly recorded on each of the recording tracks T _A and T _B as described above, the error correction unit 46 reproduces from each recording track T _A and T _B. Performs error correction independently for data. At this time, the number of occurrences of the syndrome when performing error correction on each reproduction data is detected and supplied to the syndrome detection unit 61.

The syndrome detection section 61 determines the number of occurrences of the syndrome supplied from the error correction section 46, and the RAM 62 for the recording data of the recording track T _A.
The recording data of the recording track T _B is supplied to the system controller 63.

The system controller 63 is the RAM described above.
The number of occurrences of the syndrome when error correction is performed on the reproduction data of the recording track T _A stored in 62, and the number of syndromes when the error correction is performed on the reproduction data of the recording track T _B supplied from the syndrome detection unit 61. The number of times of occurrence is compared, and the reproduction data of the recording track with the least number of times of occurrence of syndrome is validated. Further, the system controller 63 controls the reading from the buffer 47 so that the valid reproduction data is supplied from the buffer 47 to the index separating unit 48. As a result, from the reproduction data that is reproduced in duplicate, the reproduction data in which the number of occurrences of the syndrome when performing error correction is small is read from the buffer 47, and the index separating unit 48 is read.
And the indexes are separated and output.

As a result, in this data storage device, since reproduced data with few errors can be effectively output from the reproduced data of the recorded data recorded in duplicate, the certainty of reproducing the recorded data is improved. be able to.

Here, when recording is performed without duplicating the data, when reproducing the recording data, the head clog is generated in only one of the magnetic heads to reproduce the recording track. If it becomes impossible, the recorded data cannot be reproduced.

On the other hand, in this data storage device, since the same data is recorded in the recording tracks T _A and T _B in a duplicated manner, it is possible to perform independent error correction as described above and reproduce. Magnetic head Hw
One of the recording tracks T _A and T
_Even if one of the _B 's cannot be reproduced at all, the record data can be reproduced from the reproduction output of the other reproducible recording track. Therefore, in this data storage device, it is possible to improve the certainty of reproducing the recorded data.

In the above description, the case where the present invention is applied to the data storage device has been described, but any recording device that digitally records recorded data may be used, such as a digital audio tape recorder device or a digital video tape recorder device. Can also be applied to.

In addition, in the above description, when performing duplicate recording, the ECC encoding unit 23 sets the C3 parity to 22.
A case has been described where two tracks of parity are added to the data of tracks and the C3 parity is recorded without overlapping. However, as C3 parity, one track of parity is added to the data of 22 tracks. However, the C3 parities may be overlapped and recorded. As a result, even if one of the magnetic heads fails during reproduction, error correction can be performed using C3 parity, and the recorded data can be reliably reproduced.

In the above description, it is possible to select whether or not to perform the duplicate recording, and to record the duplicate recording identification information for identifying whether or not the duplicate recording is performed in the system area of the magnetic tape. However, the configuration can be appropriately changed as long as it does not deviate from the technical idea of the present invention, such as dedicated recording for duplicate recording and no need for recording identification information.

[0076]

In the recording apparatus according to the present invention, since the recording data can be recorded in an overlapping manner, it is possible to perform recording with improved reproduction reliability.

Further, in the recording apparatus according to the present invention, since the error correction code can be added to the recording data to be recorded in an overlapping manner for recording, it is possible to perform recording with improved reproduction reliability.

Further, in the recording apparatus according to the present invention, when recording the recording data without duplication, different recording data are supplied to the recording means to record the recording data in the data recording area without duplication. When recording the recording data in an overlapping manner, the same recording data is supplied to the recording means to record the recording data in the data recording area in an overlapping manner, and the recording data is recorded in the identification information recording area and the data recording area. The identification information indicating that the duplicate is recorded is recorded. As a result, it is possible to perform the recording in which it is possible to easily determine whether or not the recording data is recorded in an overlapping manner.

Further, in the reproducing apparatus according to the present invention, the reproducing control means makes it possible to reproduce the recorded data surely by making one of the recorded data reproduced by the reproducing means redundant.

Further, in the reproducing apparatus according to the present invention, when error correction is performed on the reproduced record data, the number of error detections is detected, and the record data having a small number of error detections is detected from the record data duplicated. Since it can be validated, the recorded data can be reliably reproduced.

Also, in the reproducing apparatus according to the present invention, the identification information is reproduced from the tape-shaped recording medium, and the reproduction of the record data from the tape-shaped recording medium is controlled based on the reproduced identification information to thereby reproduce the tape-shaped recording medium. It is possible to automatically judge whether or not the record data is duplicately recorded on the recording medium and reproduce it.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data storage device when a recording device and a reproducing device according to the present invention are applied to the data storage device.

FIG. 2 is a diagram showing a configuration of recording tracks recorded on a magnetic tape by the data storage device.

FIG. 3 is a diagram showing a data structure of one track of data recorded on a magnetic tape by the data storage device.

FIG. 4 is a diagram showing a data structure for one unit of 46 tracks of data recorded on a magnetic tape by the data storage device.

FIG. 5 is a diagram showing a tape format of a magnetic tape on which data is recorded by the data storage device.

FIG. 6 is a timing chart showing the timing of recording data by the recording / reproducing unit of the data storage device.

[Explanation of symbols]

 20 recording data processing system 23 ECC encoding unit 24 subcode adding unit 25 header parity adding unit 30 recording / reproducing unit 40 reproduction data processing system 44 header parity detecting unit 45 subcode detecting unit 46 error correction processing unit 47 buffer 50 tracking control system 60 data reproduction control unit 61 syndrome detection unit 62 RAM 63 system controller Hw1, Hw2 magnetic heads PG1, PG2 pulse generator

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Claims (7)

[Claims] 1. A recording unit for recording recording data and identification information on a tape-shaped recording medium, and the same recording data is supplied to the recording unit in an overlapping manner, and the recording data is recorded in the data recording area in an overlapping manner. And a recording control means for controlling the recording device. 2. The recording control means adds an error correction code for each predetermined length to form the recording data, and the recording means records the recording data to which the error correction code is added by the recording control means. 2. A recording track is formed by recording on a tape-shaped recording medium.
The recording device according to claim 1. 3. The tape-shaped recording medium has a data recording area in which the recording data is recorded, and an identification information recording area in which identification information regarding the recording data recorded in the data recording area is recorded. The recording control means supplies the recording data to the recording means without duplication when recording the recording data without duplication, and when the recording data is recorded with duplication, the same recording data is recorded in the recording means. The data is supplied in an overlapping manner, and the recording means is supplied with identification information indicating that the recording data is recorded in the data recording area in an overlapping manner, and the recording means controls the recording control in the identification information recording area. 3. The recording data supplied from the recording means is recorded, and the identification information supplied from the recording control means is recorded in the identification information recording area. Mounting of the recording apparatus. 4. A reproducing means for reproducing the record data from a tape-shaped recording medium on which the record data is recorded in an overlapping manner, and a reproducing control means for activating one of the record data reproduced by the reproducing means in an overlapping manner. And a reproducing device having. 5. The recording data recorded on the tape-shaped recording medium is added with an error correction code for each predetermined length, and the reproduction control means corrects the error in the recording data supplied from the reproducing means. 5. The reproducing apparatus according to claim 4, wherein error correction is performed based on the code, and one of the duplicated record data, which has a small number of error corrections when the error is corrected, is validated. 6. The tape-shaped recording medium has a data recording area in which the recording data is recorded, and an identification information recording area in which identification information regarding the recording data recorded in the data recording area is recorded. When the record data is recorded without duplication, the identification information indicating that the record data is duplicately recorded is not recorded in the identification information recording area, and the record data is recorded redundantly in the data recording area. In this case, the identification information indicating that the record data is duplicately recorded is recorded in the identification information recording area, and the reproduction control means records based on the identification information reproduced by the reproduction means. When it is detected that the data is recorded redundantly, error correction is performed on the record data supplied from the reproducing means based on the error correction code. In addition, of the duplicated recording data, one of the duplicated recording data that has a small number of error corrections when performing the error correction is validated, and when it is detected that the recorded data is recorded without duplication, error correction processing is performed. The reproducing apparatus according to claim 5, wherein all the recorded data that are recorded are valid. 7. A data recording area in which recording data is recorded, and an identification information recording area in which duplicate recording identification information indicating whether or not the same recording data is overlapped and recorded in at least the data area is recorded. A tape-shaped recording medium having the same.