JPH02281475A - Data recording/reproducing device - Google Patents

Abstract

PURPOSE:To smoothly reproduce a 1st record and an additional record recorded afterward by recording information to a recording medium and successively recording the dummy data in more than a prescribed number of information units. CONSTITUTION:At the time of recording a data, the write and read are repeated by utilizing write heads W1 and W2 and also read heads R1 and R2 of a rotary cylinder 9, and the data transferred from an external computer 1 is recorded in turn to a magnetic tape 14. Then, when the data transfer is stopped, the dummy data corresponding to a delay frame is successively recorded to the magnetic tape 14 upon completion of the write of the data. By this method, if this recording is correctly carried out, an additional recording is performed, and even when there is a disturbance in tracking at the time of commencing this additional recording, it is decided to be correct at the time of reproducing, and then the additional record can also be read out without trouble.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention uses a magnetic recording and reproducing device, such as a rotary head type digital audio tape recorder (abbreviated as R-DAT), as an auxiliary storage device for a computer, etc. The present invention relates to a data recording/reproducing device suitably implemented in various cases.

(Summary of the Invention) The present invention relates to a data recording/reproducing device using a read-after-write method, and is capable of recording information by continuously recording dummy data of a predetermined number of information units or more after recording information on a recording medium. When additional recording is subsequently performed, the initial recording and additional recording are smoothly played back.

(Prior art) When using R-DAT as an auxiliary storage device for a computer, for example, since digital signals from the computer are directly recorded, interpolation, which is used when recording and playing back music, etc., is used. It cannot be used. Therefore, it is not possible to obtain sufficient reliability in recording, so a method called read-after-write is used. That is, during recording, information to be recorded is written in units of information by a write head on a recording medium that can be recorded and reproduced, and is also written in memory, and the information written on the recording medium is read by a read head to prevent errors. 9
The detection means detects all errors in this read information,
Based on the detection result of the detection means, the information unit containing the erroneously written information is read from the memory and written again to the recording medium by the write head, which is called a full IJ-after write method.

When this read-after-write method is used, the information written on the recording medium is read by the sound read head, the error detecting means detects whether or not there is an error in the read information, and if there is no error, it is read out. The data output from the signal processing circuit is several frames later than the data output from the external computer.

This is a combination of various delays, such as the delay when writing, the delay when the data is read into the interface circuit or memory, the delay required to add parity, the delay when the data is read into the signal processing circuit, the delay required for error detection during readout, etc. Due to the collection, there will be a delay of several frames as described above. This delay of several frames varies depending on the circuit of each device, but for example, in the moat machine considered in the present invention, a delay of one six frames occurs. The following countermeasures were taken against this predetermined delay.

That is, when an error is detected by the error detecting means, data transfer from the external computer is immediately stopped by the delay frame. Then, the above-mentioned predetermined frame amount (delayed frame amount) including the data for which the error was detected is written from the memory again, and if the data is read and no error is detected, information from the external computer is continued to be written. It's a system that works.

A frame number is recorded in each information unit, that is, each frame, on the recording medium, but if the writing method using the above system does not detect errors when reading,
If the same frame number is not recorded again and an error is detected, the frame number of the error is always recorded again on the magnetic tape with the same frame number interposed in the delayed frame. In other words, when reproducing a magnetic tape recorded using the read-after-write method, if a frame with the same number is not reproduced in the delayed frame after reading the data of a certain frame, that frame is determined to be correct data. As a result, they will be sequentially transferred to an external computer. However, if a frame with the same number is reproduced after the predetermined number of frames, this will confirm that an error has been detected by the error detection means during recording and has been rewritten. Regarding the recording and reproducing system using such a read-after-write method, a flowchart shown in FIG.

In step P1, it is detected whether or not data has been transferred from the external computer, that is, the presence or absence of data. All of that data is signal-processed in step P2, and all of the signal-processed data is written on the magnetic tape by the write head. In the instant stellar stage P3, the data written by the read head is read and all signal processing is performed, and in step P4, it is fully detected whether or not there is an error 9 in the data, and the above-mentioned error code is not detected. If an error is detected, return to step PI, continue reading afterlight lf, and if an error is detected, return to step P5.
At this point, data output from the external computer is stopped, data is read from the memory, and the data is written again using the read-after-write method. This procedure is repeated until the data transfer from the external computer is stopped, and the recording ends. In other words, recording using the conventional recording method stops when data from an external computer is no longer transferred, and dummy data is generally not recorded, and even if dummy data is recorded, it is limited to 2 to 3 frames at most. It was up to about 1 meter.

A pattern diagram of recording on a magnetic tape according to this conventional recording method is shown in FIG. 12(A) and FIG. 12(B). 1st
Figure 2 (A) is a pattern diagram showing the first recording state, and Figure 12 (CB) is a pattern diagram showing the recording state of the first recorded state, and Figure 12 (CB) is a pattern diagram showing the pattern that is recorded continuously on the recording medium where recording is completed in the pattern circulation diagram of Figure 12 (A). FIG. 7 is a pattern diagram showing a recording state in which additional recording has been performed.

Record no l+[[/lt, frame 1. Frame 2. Data corresponding to each frame is recorded in the order of frame 3, etc.

In Figure 2 (A), from frame 1 to frame 6, data N+1, data N+2... data N
+6 data is recorded respectively, and continues to be kiframe 7.
．． Dummy data 1 over frame 8. Dummy data 2
The dummy data is shown as being recorded.

In Figure 12 CB), the final frame Al of the first recording
That is, frame 8, K pull We, frame 9 to frame 17, dummy data 1', dummy data 2', etc.
... Dummy data of dummy data 9' is recorded and then frame 18. Frame 19, frame 20.・
Data 1', data 2', data 3', etc.
. . . are shown as being recorded.

In this additional recording (recording after frame 9), dummy data (dummy data 1 ′, dummy data 2′,・
...Dummy data 9') is recorded. This is due to tracking deviation due to insufficient control due to the start-up of the capstan's rotation at the start of recording, resulting in dummy data (dummy data 1', dummy data 1', dummy data 1', dummy data 2',
. . ., dummy data 9') are recorded, and during that time the capstan's rotational speed is completed to a predetermined rotational speed, and additional data (data 1', data 2') are recorded from the external computer. , data 3', . . . ) to ensure that regular tracking is performed at the time of recording. The reproduction of the recording medium additionally recorded as described above is performed in accordance with the following procedure.

Frame 1. Frame 2. The data of each frame is sequentially read out in the order of frame 3, . . . . That is,
First, the data recorded (data N11, data N
+2. ..., data N+6), dummy data when first recorded (dummy data 1゜dummy data 2)
) First, data is sequentially read out by the read head in the order of dummy data (dummy data 1', dummy data 2', . . .) at the start of additional recording. Then, when the data on frame 7, that is, dummy data 1, which is the first dummy data recorded during the first recording, is read out, the data recorded in frame 1, that is, a predetermined number of delayed frames (6 frames) before, is read out. N+1 is
As mentioned above, the data is confirmed to be correct and transferred to an external computer. When dummy data 2 recorded in frame 8 is read out, data N+2 also recorded in frame 2 is determined to be correct and is transferred to an external computer. Subsequently, when the dummy data 1' of frame 9 was read, it was recorded with insufficient control of the capstan rotation speed, that is, with tracking disordered, so that frame 9) of frame 9) was read. Because the number cannot be recognized, frame 3 data N
It becomes impossible to judge whether +3 is correct data or not. Therefore, in an attempt to read the data again, the recording medium is rewound in the y direction opposite to the tape running direction, and from frame 3 to frame 4. Frame 5 Read each data in order Frame 9
When dummy data 1' is read, as before, it cannot be determined whether data N+3 of frame 3 is correct data or not, so it is rewound again to frame 3. In this way, this operation is repeated 9 After repeating this several times, it is determined that frame 3 was not recorded correctly.

(Problems to be Solved by the Invention) In recording and reproducing using the read-after-write method, recording is performed using the conventional recording method, that is, a method in which recording ends without recording more than a predetermined number of dummy codes at the end of recording. When additional recording is performed after that, there is a drawback that what was recorded correctly at first is determined to have not been recorded correctly during playback due to tracking disturbances at the start of additional recording.

(Means for Solving the Problems) The present invention aims to eliminate the above-mentioned conventional drawbacks,
The information to be recorded is written in units of information by a write head on a recording medium that can be recorded and reproduced, and is stored in a memory.The information written on the recording medium is read out by a sound reading head, and is detected by an error detecting means. Errors in this read information are detected, and based on the detection results of this detection means, the information unit containing the erroneously written information is read from the memory and written to the recording medium again by the write head. The recording/reproducing apparatus is provided with means for recording dummy data of a predetermined number of information units or more after finishing recording the information to be recorded on the recording medium.

(Function) By providing a means for recording a predetermined number or more of dummy data at the end of recording as described above, if the recording is correctly recorded, additional recording will occur and tracking will be disturbed at the start of the additional recording. Even if the data is played back, it is determined that the recording before the additional recording was performed correctly.

(Embodiment) FIG. 1 is a 10-step diagram showing the configuration of an embodiment of the present invention. In this embodiment, a rotary head type digital audio tape recorder is used as an auxiliary storage device of the external computer 1.

When recording data from the external computer 1 onto the magnetic tape 14, the data from the external computer 1 is applied to the interface 2 via the line Lk. The data on line l is image information, audio information, arithmetic processing information on the external computer 1, etc., and is transmitted in units of information for two tracks on the fIIK tape 14 (hereinafter, this information unit is referred to as a full frame). Ru. One frame includes, for example, 5120 bytes of data, which is divided into frames by the external computer 1 and output.

In this embodiment, one frame is divided into a plurality of regions as shown in FIG. That is, one frame is composed of, for example, five data areas a-e and parity areas Pa to Pe that individually correspond to the data areas 3-e. The 5120 bytes of data mentioned above is 1
The data is divided and stored into data areas a to e, each having a data amount of 0.024 bytes. Parity area Pa~
Pe each has, for example, 128 bytes of data and individually corresponds to data in data areas a to e. The data of this parity area Pa=Pe is added at the interface 2 and used as an error correction code. In the R-DAT, parity is also added during signal processing as will be described later, but the one-frame configuration shown in FIG. 5 provides even higher reliability as an auxiliary storage device.

Such data is sent from interface 2 to line 112.
The signal is output to the memory 3 of the random access memory via the line 13, and is also output to the signal processing circuit 7 via the line 13. The memory 3 is divided into eight storage areas MO to M7 as shown in FIG.
-M7, and each storage area MO to M7 stores data for one frame.

In the memory 3, data for one frame from the interface 2 is first stored in the storage area MO. At this time, the data in the storage areas MO to M6 of the memory 3 are sequentially transferred to the left storage areas M1 to M7, respectively. Furthermore, data in the storage area M7 is normally erased. For example, Figure 3 (
1), when data of frame numbers N+7 to N, which will be described later, are respectively stored in the storage area MO-M7, frame numbers N+8. When N+9 data are sequentially input, the memory 3 stores data as shown in Fig. 3 (2) and Fig. 3 (3).
The storage status changes to the one shown in . Input/output operations at the interface 2 are performed in accordance with control signals from a control circuit 4 implemented by a microcomputer or the like.

Parity is added to the data taken in from the interface 2 to the signal processing circuit 7 via the fin e3 in a normal R-DAT, and the parity-added data is output to the amplifier circuit 8 via the line 14. . The data signal amplified by the amplifier circuit 8 is transmitted to the write head WIIC'E via the line 15 by a signal synchronized with the rotation of the rotary cylinder 9 from the synchronization circuit 13.
The signal is switched to the write head W2 via the 1st line and written on the magnetic tape 14.

The write heads Wl, W2 and the read head RIR2, which will be described later, are fixed to a cylindrical rotating cylinder 9.

FIG. 2 is a perspective view showing the structure of the rotating cylinder 9 and its vicinity. The rotary cylinder 9 is rotationally driven by the motor 6 around its axis in the direction indicated by the arrow 20. At this time, a control signal from the control circuit 4 causes the servo circuit 5 to control the motor 6.
control the rotation speed of the Further, the magnetic tape 14 is run in the direction indicated by an arrow 21 by a capstan motor (not shown) or the like. The magnetic tape 14 is in contact with the side surface of the rotary cylinder 9 at an angle Al'. This angle A1 is, for example, 90'.

Writing heads Wl, W2 and reading head R1+
R2 is provided on one diameter line of the side surface of the rotating cylinder 9, respectively. The writing head W1 and the reading head R1 corresponding to the writing head Wt are provided at an angle A2 in the radial direction and slightly shifted in the axial direction. Angle A2 is, for example, 90°.

These writing heads Wl and W2 scan the magnetic tape 14 in an oblique direction as shown in FIG. 4, forming tracks A and Be, respectively. The frame number mentioned above is A
It is recorded in a part of the subcode area in the TF and subcode areas 16a and 16b. The data written on the magnetic tape 14 is read out by the read heads R, R2, which individually correspond to the write heads W+, W2, by switching with the synchronization signal from the synchronization circuit 13, as in the case of writing described above. Signals from read heads R1 and R2 are on line 1
7 and 18 to amplifier 10, respectively. At this time, the read heads R1, R2 individually correspond to the write heads W1. The data on the track A formed by W2 is read out. amplifier 1
The data signal amplified by 0 is outputted to the synchronization circuit 11 via the line 19, and synchronized with the clock signal g from the clock generation circuit 15 in the synchronization circuit 11. The output from the synchronization circuit 11 is sent via line 110 to the signal processing circuit 12.
Error correction is performed using the parity added by the fg processing circuit 7. At this time, signal processing such as error correction is performed by the synchronization circuit 13 synchronously with signal processing such as parity addition in the signal processing circuit 7.

Data output from the signal processing circuit 12 is on line 112.
'f: Provided to the above-mentioned interface 2 via.

Normally, the interface 2 stores all data in the memory via the line 12, and then reads the data from the memory 3 and outputs it to the external computer 1.

6 and 7 are a time chart and a flowchart for explaining the write operation of the configuration shown in FIG. 1. The operation will be described below with reference to these figures. 7th
In the figure, in step nl, it is detected whether or not data has been transferred from the external computer, and if it is detected that data is present, frame number N+1 (I
=0.1°2...) data are sequentially output. At this time, the synchronization signal shown in FIG. 6 (1) is transmitted to the synchronization circuit 1.
Output from 3. The synchronization signal is a signal representing the rotation period of the rotary cylinder 9, and the data is taken in in synchronization with this synchronization signal. The data output from the external computer 1 is as shown in Figure 6 (2).

At this time, the data with frame number N+1 is stored on the magnetic tape 14.
The time it takes to write to the interface circuit 2
It takes one frame for the data to be taken into the memory 3, and the time required to add parity shown in FIG. 5 is one frame. Therefore, the data output from the interface 2 to the signal processing circuit 7 is delayed by two frames compared to the data output from the external computer 1, as shown in FIG. 6(3).

Before the above-mentioned data is derived to the write heads Wl and W2, one frame worth of data is required to be processed by the key signal processing circuit 7, and parity is added in the conventional R-DAT. The time required for this is the time equivalent to one frame. Therefore, the writing heads Wl, W
As shown in FIG. 6(4), the data derived from interface 2 and the data output from interface 2 to signal processing circuit 7 are also delayed by a time corresponding to two frames.

Furthermore, when reading data written on the magnetic tape 14, it takes time for one frame to be read from the reading heads R1 and R2 to the C processing circuit 12, It takes one frame's worth of time to correct errors using parity in the DAT and to detect errors in step n3 in FIG. Therefore, the data output from the signal processing circuit 12 is also delayed by six frames compared to the data output from the external computer 1, as shown in FIG. 6(5).

In step n3 of FIG. 7, if no error is detected in the signal processing circuit 12, the process returns to step n2 and the above-described write operation is performed on the data of the next frame number.

In this embodiment, all data on the magnetic tape 14 of frame number N+3 indicated by reference mark Ea in FIG. 6(5)
Assume that an error occurs when writing to . If this error is detected in the signal processing circuit 12 and the error cannot be corrected, step n4 to step n in FIG.
Move on to 5. As shown in FIG. 6(6), the sterilization circuit 4 sets the signal derived from the interface 2 to the line 1I8 to a high level, for example, and stops outputting data from the external computer 1. The storage state of the memory 3 at this time is shown in FIG. 3 (5). After this memory 3
Then, data is sequentially output again from frame number N+3 (FIG. 6 (3)). In this way, the process returns to step n2 in FIG. 7, and the data for six frames, including all the data of frame number N+3 in which the error occurred, is again written on the magnetic tape 14 (FIG. 6 (4)).

If data up to frame number N+8 has been output from memory 3 and error correction has been possible up to this point,
That is, when normal writing is being performed, the signal on line IIs goes to low level 9 (Fig. 6 (6)).
)), the output from external computer 1 is frame number N
Normal writing is resumed from data +11 (FIG. 6(2)).

Therefore, when recording data, the rotating cylinder 9
The writing head W1. By using not only W2 but also the reading heads R1 and R2e, even if a writing error occurs due to a scratch on the magnetic chip 114 due to repeated writing and reading, the rotary cylinder 9 will remain rotationally driven and will not be affected by this error. The data for six frames containing the generated data is read out from the memory 3 again and written to the magnetic tape 14.

As described above, the data transferred from the external computer 1 is sequentially recorded on the magnetic tape 14 according to the flowchart from step nl to step n5.

When the data transfer from the external computer 1 is stopped, it is detected in step nl that there is no data, and in step n6, 6 frames of dummy data corresponding to the delayed frames are added to the magnetic tape 14 after the data writing is completed. will be recorded, and the recording of Sukhete will be completed.

FIGS. 8 and 9 are a time chart and a flowchart for explaining the operation of reproducing data recorded on the magnetic tape 14 by the above-described operation. When sending the data on the magnetic tape 14 to the external computer 1, the data on the magnetic tape 14 is
The fc data recorded above is read out by reading heads R1 and R2 of the rotary cylinder 9, and is applied to a signal processing circuit 12 via an amplifier circuit 10 and a synchronization circuit 11. In normal operation, the signal processing circuit 12 corrects the error and detects data of the same frame number in step m2 of FIG. 9, and then the data is sent to the input circuit 2 and memory 3. As shown in FIG. 3, the memory 3 is composed of eight storage areas MO to M7, and data is sequentially transferred from the storage area MO to the storage area M for each frame as in the write operation.
If no data with the same frame number is detected, the process returns from step m8 to step m1 in FIG. 9, and the data in area M7 is output to the external computer 1.

To explain in detail, in step m2 in FIG. 9, the sidetracking circuit 4 detects the frame number included in the subcode in the data output from the official code processing circuit 12, and 6 frames later, the same frame number is input to the signal processing circuit 12. determine whether it has been done. If data with the same frame number is input six frames later in the ninth step m3, the data stored in the area M7 in the memory 3 is not output to the external computer 1. Therefore, data with writing errors will not be output to the external computer 1.

For example, if an error occurs in the data of frame number N+3, the data output from the reading heads R1 and R2 in synchronization with the synchronization signal from the synchronization circuit 13 (FIG. 8 (1)) will be This is shown in Figure 8 (2). Reference number E
The data from frame number N+3 to frame number N+81, which is indicated by b and includes erroneous data, is recorded redundantly on the magnetic tape 14 and is read out repeatedly.

When data with correct frame number N+3 is input to memory 3, storage area MO and area M6 of memory 3
Data of the same frame number N+3 is stored in (4) of FIG. In such a case, the control circuit 4 stops sending data to the external computer 1.

However, the data is sequentially sent out from the read heads R1 and R2, and the data in the memory 3 is sequentially shifted as shown in FIG. 3(5). When the state shown in Figure 3 (5) is reached, the output of data to the external computer 1 is resumed, and the data is sequentially output to the computer 1 starting with the data of frame number N+3 that has no errors in writing. Therefore, as a result, only correct data is output to the external computer 1 as shown in WSs diagram (3).

As described above, data from the external computer 1 can be recorded and reproduced.

Next, as described above, f is recorded on the E tape 14.
A case in which additional recording is performed on the FI tape 14 will be described in detail.

FIG. 1O shows a pattern diagram of additional recording.

FIG. 10(A) is a pattern diagram showing the first recording state, and FIG. 10(B) is a pattern diagram showing the recording state of the first recording, and FIG. FIG. 7 is a pattern diagram showing a recording state in which additional recording has been performed.

Data corresponding to each frame is recorded in the order of frame 1, frame 2, frame 3, and so on.

, ff<1 (1(A), from frame 1 to frame 6, data N+1. data N+2...
・The data from the external computer l of data N+6 is recorded respectively, and then frames 7 to 12 are recorded.
Dummy data 1. Tammy data 2.・・・・・・
- The diagram shows that dummy data of dummy data 6, that is, dummy data for 6 frames per delayed frame, is recorded, and recording is completed by this recording.

In FIG. 10(B), dummy data 1', dummy data 2', .
. . . Dummy data of dummy data 9' is recorded, and then frame 22. Frame 23, frame 24.
...... data 1', data 2/, data 3',
. . . data from the external computer 1 is shown as being recorded.

In this additional recording (recording after frame 13), dummy data is added before the additional data (data 1', data 2', data 3', etc.) from the external computer 1 is recorded. (Dummy data 1', dummy data 2'
, . . . dummy data 9') are recorded.

This is due to tracking deviation due to insufficient control due to capstan rotation start-up at the start of recording, resulting in dummy data (dummy data 1', dummy data 2',
. . . , dummy, -data 9') are recorded, and during that time, the rotational speed of the cabnut tongue is completely controlled to a predetermined rotational speed, that is, additional data (data 1', data 2 ′, data 3′...)
This is to ensure that proper tracking is performed at the time of recording.

Therefore, following the additional recording procedure in FIG. 10 CB), the result is as follows.

The reading heads R and R2 read from several to ten frames V-A before the last frame (frame 12) of the first recording, and immediately start writing from frame 13 as soon as the last frame of the first recording, that is, frame 12, is read. WIW
2 starts writing. At this time, when reproducing the first recording, the ATF and subcode area 16a shown in FIG.

Tracking is performed based on the ATF stone number 16b, and at frame 13, the tracking method is switched to the one used during recording. In frames 13 to 21, dummy data (dummy data 1', dummy data 2', . . .
...dummy data 9')' is recorded, but the capstan rotation speed is completely controlled during the recording of this 9 frame n11, and then additional data (data 1) from the computer 1 is recorded.
', data 2', data 3', . . . ) are recorded in a state where normal tracking is performed.

The above data is recorded sequentially from the first recording, that is, frame 1. A case will be described in which reading is performed in the order of frames 2, . . . .

The reading head RIR2 reads out frames 1, 2, etc. in the order of frame 1, frame 2, etc., and when the dummy data 1 of frame 7 is read out, the same frame is not detected in step m3 in FIG. In other words, data N+IH of frame 1 six frames before is determined to be correct data. Similarly, it is determined that data N+2 of frame 2 is correct when frame 8 is correct, data N+3 of frame 3 is judged to be correct when frame 90 is correct, and data N+6 of frame 6 is judged to be correct when frame 12 is selected. In other words, all data from the external computer 1 in the first recording is determined to be correct. and,
From frame 13, dummy data with disturbed tracking (dummy data 1', dummy data 2', etc.)
) has been recorded, so it cannot be played back, but the computer 1 where it was originally recorded.
Data from (Data N+1. Data N+2.)
- Data N+6) has already been sent to the external computer 1 as correct data, that is, even if there is a tracking disturbance at the beginning of additional recording, it has no effect on the reproduction of the first recording. The data at the beginning of additional recording is dummy data (dummy data 1', dummy data 2', dummy data 3', dummy data 9'), and there is no problem even if reading fails. Frame 2 where the last dummy data (dummy data 9') is recorded
At point 1, tracking control during recording has already been completed, and tracking during recording from the point 22 onwards is normal. That is, additional data from the external computer 1 whose tracking can be controlled by the ATF signal is also read normally.

(Effects) Therefore, the data recording/reproducing device of the present invention records dummy data of a predetermined number or more (the number of delayed frames from the time of data input from the external computer to the time of output from the readout signal processing circuit) at the end of recording. By providing a means to do this, if the recording is correctly recorded, even if there is a tracking disturbance at the start of the additional recording, the information is already recorded at the time of reading the additional recording start part during playback. Since the dummy data is read, it is determined that all the data are correct. When reproducing a disturbed portion of tracking at the start of additional recording, the next frame e ax is sequentially exported without being affected by the recording, and additional recording from an external computer is read out without any problem.

FIG. 1 is a block diagram showing the structure of an embodiment of the present invention, FIG. 2 is a perspective view showing the structure around the rotating cylinder 9 of the embodiment shown in the first drawing, and FIG. 3 is a block diagram showing the structure of the embodiment shown in the first drawing. A fourth diagram for explaining the memory contents of MO to M7 at each operation time.
The figure shows the magnetic tape 14 on which data is recorded.
The figure shows the content of one frame of data, FIGS. 6 and 7 are time charts and flow charts for explaining the recording operation of the embodiment shown in the first figure, and FIGS. FIG. 10(A) is a diagram of the recording pattern recorded on the magnetic tape 14 in the embodiment shown in FIG. FIG. 10 is a diagram of a recording pattern on the tape 14 additionally recorded on the magnetic tape 14 recorded as (A), FIG. 11 is a flowchart for explaining the conventional recording operation by the read-after-write method, and FIG. Figure (A) is a recording pattern diagram on a magnetic tape recorded by the conventional example, Figure 12 CB)
12 is a recording pattern diagram of a magnetic tape additionally recorded on the magnetic tape recorded as FIG. 12(A).

Claims (1)

[Claims] 1. The information to be recorded is written in units of information by a write head on a recordable and reproducible recording medium and stored in memory, and the information passed to the recording medium is read by a read head and an error detection stage is used. detects an error in this read information, and based on the detection result of this detection means, the information unit containing the erroneously written information is read from the memory and written to the recording medium again by the write head. In data recording/playback equipment,
A data recording/reproducing apparatus characterized in that, after recording the information on a recording medium, dummy data of a predetermined number or more of information units is subsequently recorded.