JPH02103777A - Method for copying bit pattern on recording medium - Google Patents

Abstract

PURPOSE:To prevent deviation of bits in a part other than a gap by discriminating the gap in data on a transfer object track of a transfer source recording medium and using this gap as a write joint to put an unwritable bit pattern in the gap and recording data on a transfer destination recording medium with this gap as the start. CONSTITUTION:All data on an N-th track of a transfer source floppy disk 1 is inputted, and a gap on data stored in a storage means 7 is discriminated. Data beginning with the found gap is read again by a reading means 3 and is stored in the storage means 7 again. One data in the gap is substituted with the unwritable bit pattern for the purpose of putting the write joint in the gap, and data is written on a floppy disk 10 with the gap as the start by a writing means 9. Thus, deviation of bits is prevented by write joints at start and end points of recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for copying data on a recording medium to another recording medium.

[Prior Art] A conventional recording medium duplication method is a method called file transmission. Here, a file is a collection of information that is systematically collected according to a certain purpose, and is a form of data management. This file transmission method is to read the signal in the recording medium with a head, convert it into a file-shaped signal according to the method of each system, transmit this file-shaped signal, and then perform the above-mentioned conversion at the transmission destination. The head performs the reverse conversion and writes the signal onto the recording medium.

[Problems to be Solved by the Invention] The recording medium duplication method using file transmission described above has the following drawbacks.

1. Communication between different types of computers is not possible or difficult.

Communication was not possible due to differences in the file structure due to differences in computer type, FD type, etc.

2. Communication is not possible if there is a difference in operating system (hereinafter abbreviated as O8) or format.

This means that the file transmission method provided for one O8 or format cannot be transmitted for another O8 or format because the conversion to a file-shaped signal is completely different. Furthermore, even the same O8 may have different file formats depending on the computer model, and in this case, of course, transmission is impossible.

3. Operation is complicated and usually requires a dedicated operator.

Once the operator understands the structure and concept of files in the recording medium, it is necessary to search for the (targeted) file in the recording medium, store it in the storage device, and then transmit it.

4. Computer programs (especially those similar to systems) cannot communicate.

In order to solve the above-mentioned problems, it is conceivable to adopt a method that does not rely on file transmission methods.

The basic idea is that all the data on the FD is
Just like operating a paper facsimile machine,
The idea is to transmit images, characters, graphics, etc. in their entirety, regardless of the content of the data. Conventionally, the method used was to use FDC (floppy disk controller), but it was not possible to completely solve all of the above problems, and
Only formats known to DC can be transmitted,
Special formats and protected files could no longer be handled. Therefore, a method of transmitting all bit images (01 signals) was considered, but this method had the following specific problems and was an obstacle to its complete practical application to the transmission of recording media.

1. It is difficult to locate the splice point.

When recording data on an FD, it is difficult to determine the position of the point where the head of a floppy disk drive (FDD) touches and leaves the FD.

2. Bit misalignment of data occurs.

When recording data on a track, bits may be distorted at the transition point between the start and end points of recording, making it impossible to verify what has been written.

[Means for Solving the Problems] The method for duplicating a bit pattern on a recording medium according to claim 1 of the present invention is a reading method that sequentially reads data for one track (code of 0°) of a transfer source recording medium. storage means for storing read data; judgment means for determining gaps in the data read from a recording medium; and writing means for writing the data stored in the storage means onto a destination recording medium. using a recording medium duplicating device comprising: a step of reading the data again in the storage means with the determined gap at the beginning by the determination means; An unwritable bit pattern (which can be read but cannot be written with FDC) that cannot be reproduced with
and writing data onto a destination recording medium with the gap as the beginning.

Further, a method for copying a bit pattern on a recording medium according to claim 2 of the present invention is characterized in that, in addition to claim 1, the method includes the step of transmitting read data.

Further, the method for duplicating a bit pattern on a recording medium according to claim 3 of the present invention includes a reading means for sequentially reading data for one track (code of 0°1) of a transfer source recording medium, and a writing means for writing the read data. recording medium controller means for inputting data to the writing means; determining means for determining whether the data read by the recording medium controller can be input to the writing means; and determining means for determining whether the data read by the recording medium controller can be input to the writing means. means for switching input of the read data to the recording medium controller/roller means if input is possible, and switching input of the read data to the storage means if input is not possible; a storage means for storing data; a determining means for determining gaps in data in the storage means; and writing the data stored in the storage means or the data input from the recording medium controller means into a destination recording medium. a recording medium duplicating device comprising a writing means, the recording medium controller determines whether or not the read data can be input to the writing means; a step of writing the data inputted by the controller means to the transfer destination recording medium; and a step of determining whether or not the recording medium controller can input the read data to the writing means, according to a determination of whether input is not possible by the determining means,
a step of inputting the data read by the manual switching means into the storage means; a step of reading the data again with the determined gap at the beginning and storing it in the storage means by the gap determination means; There is an unwriter pull bit pattern (which FDC can read but cannot write) that cannot be reproduced by the recording media controller (hereinafter abbreviated as FDC) in the gear knob.
and writing data onto a destination recording medium with the gap as the beginning.

Furthermore, the method for copying a bit pattern on a recording medium according to claim 4 of the present invention is characterized in that, in addition to claim 3, the method includes the step of transmitting read data.

[Operation] In the first method of duplicating a bit pattern on a recording medium of the present invention, one track worth of data (
0,■ code) are sequentially read and stored, the gap in the data read at this time is determined, the gap is read and stored again starting from the beginning, and in order to use this gap as the rewriting point, An unwriter pull bit pattern that cannot be reproduced by the storage medium controller (which can be read but cannot be written by the FDC) is placed in the storage medium controller, and then the stored data is sequentially transmitted to the destination storage medium with that gap at the beginning. Write.

In the second method of duplicating a bit pattern on a recording medium of the present invention, in addition to the second aspect, an operation of transmitting data is added.

Furthermore, in the third method of duplicating a bit pattern on a recording medium of the present invention, data for one track (codes of 0 and 1) of a transfer source recording medium is sequentially read, and the data is transferred via a recording medium controller. When it is possible to write to the destination recording medium, it is written, and when it is not possible, it is memorized. At this time, the gear in the read data is determined, the gap is read and stored again starting from the beginning, and this gap is used as the rewriting point. In order to do this, an unwriter pull bit pattern that cannot be reproduced by the recording medium controller (which can be read but cannot be written by the FDC) is placed in the gap, and then those stored with the gap at the beginning are Data is sequentially written to the destination recording medium.

Further, in the fourth method of duplicating a bit pattern on a recording medium of the present invention, in addition to the third aspect, an operation of transmitting data is added.

[Example] A method for duplicating a bit pattern on a recording medium according to the present invention will be described in detail based on drawings showing an example thereof. FIG. 1 is a block diagram showing the electrical configuration of a floppy disk duplicating device 1 used to implement the present invention. In Figure 1,
The data in one track in the source floppy disk 2 is read by the reading means 3 (comprised of a magnetic head, its driving circuit, and a shaping circuit) and is temporarily recorded in the storage means 7. The stored data is determined by the determining means 5 of the control section 4. The control unit 4 is composed of a microprocessor, and performs data determination processing, which will be described later, according to a control program written in the memory 6. According to the processing, the data in the one track is stored again in the storage means 7 from the reading means. The data stored in the storage means 7 is sent to an unwriter pull bit pattern replacement circuit 8, and then written to a destination floppy disk 10 by a writing means 9 (comprised of a magnetic head, its driving circuit, and a shaping circuit).

Next, the details of the control operation of the control section 4 will be explained according to the flowchart shown in FIG. All the data of the Nth track of the second floppy disk is now input (step 1) to store the data in the storage means.step 2) to determine the gaps on the stored data.step 3). For example, in a double-density FD, useful data is recorded on one data track, and 4E is recorded on the remaining part.
This is the part that is filled with data such as. The data is read again by the reading means with the found gap at the beginning, and is stored again in the storage means (step 4).
, since the data in the gap is not useful and there will be no adverse effect even if the bit shift occurs, for the purpose of placing a rewrite point here, one data in the gap described in the above is written as an unwriter pull bit pattern (in FDC Replace the unreproducible bit pattern with, for example, 100010010001 (step 5), and write data to the destination FDC using this gap as the beginning (consisting of a magnetic head, its drive circuit, and signal circuit) by the writing means (step 6).
, these steps 1 to 6 are repeated until the transfer of the transfer target track on the floppy disk is completed (step 7).

In the above embodiment, an example of a so-called FD duplicating device in which data is directly inputted from the storage means 7 to the writing means 9 via the unwriter pull bit pattern replacement circuit 8 has been described, but in FIG. shows. In the example of FIG. 3, data is transmitted to a remote transmission device 13 through a general communication line, such as a telephone line, through a serial interface 11 and a communication device 12, such as a modem, after the storage means 7, for example, a telephone line. The data is transmitted to the transmitting device 13 on the receiving side.
The data is input to the writing means 7 via the communication device 12 and the serial interface 11 through the unwriter pull pit pattern writing circuit 8, and then written to the destination floppy disk 10. This is an isolated floppy disk duplicating device, a so-called floppy disk transmission device.

Furthermore, although the above embodiments were all examples in which only the FD duplication method according to the present invention was used, FIG. 4 shows another embodiment. In the example of FIG. 4, the FD is installed after the reading means 3.
A C circuit switching circuit 21 is provided, and once the data is read, it is processed by a conventional FDC circuit 22. If the data can be processed by the FDC circuit, the data is input as is to the writing means 9 and sent to the transfer destination. FDIO
will be forwarded to. If the data cannot be processed by the FDC circuit 22, the FDC circuit switching circuit 21 selects the data according to the first embodiment.
It is processed by a series of circuits explained in .

By configuring such a circuit, data that can be processed by the FDC circuit 22 is processed by the FDC circuit 22 at a higher speed, and only data that cannot be processed is processed by the circuit described above, making it possible to further increase the processing speed.

Furthermore, as an example of a combination of the embodiments described in 1, the example of the floppy disk transmission device shown in FIG.
An example of a combination of examples of a floppy disk reproduction device including circuitry is shown in FIG.

This example has a configuration most suitable for practical use as an actual device, and its operation is the same as the examples shown in FIGS. 3 and 4 of each embodiment.

In the first embodiment, the writing means and the reading means have been explained separately, but it goes without saying that in an actual device, both means are used in common by the same device.

” Embodiment 1 gives an example of using a gap, but it goes without saying that a sink etc. can be used instead of the gap in this example as a part of one data track where useful data is not recorded. Nor.

[Effects of the Invention] As described above, according to the method for duplicating bit patterns on a recording medium according to claim 1 of the present invention, gaps in data in a transfer target L/rack in a transfer source recording medium are determined. , take this gap as a transfer point, and add FDC during this gap.
By placing an unreproducible unwriter pit pattern (for example +00010010001>) and recording it on the transfer destination recording medium with this gap at the beginning, it is possible to position the rewrite point and prevent pit deviations in areas other than the camp. This makes it possible to copy a bit pattern on a recording medium with high reliability, without causing any occurrence of errors.

Further, according to the method of duplicating a bit pattern on a recording medium according to claim 2 of the present invention, in addition to the above-mentioned effects, it becomes possible to transmit data in a source recording medium to a long distance.

Further, according to the method of copying a bit pattern on a recording medium according to claim 3, in addition to the effects of claim 1 described above, a conventional recording medium controller means is combined, and the data in the transfer source recording medium is transferred to the conventional recording medium controller means. By performing switching such that if processing is possible, the processing is performed, and if processing is not possible, processing is performed by the method of claim 1, a faster and more rational duplication method becomes possible.

Furthermore, according to the method for duplicating a bit pattern on a recording medium according to claim 4, in addition to the effect of claim 3 described above, it becomes possible to transmit data in a source recording medium to a long distance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of a device used to implement the present invention, FIG. 2 is a flowchart showing the operation of the control section, and FIGS. FIG. 3 is a block diagram showing the electrical configuration of each of the other embodiments of the device used in the present invention. In the figure, 3 is a reading means, 5 is a judgment means, 7 is a storage means, 8 is an unwriter pull bit button replacement circuit, 9 is a writing means, 21 is an FDC circuit switching circuit, and 22 is an FD
It is a C circuit.

Claims (4)

[Claims] (1) Data for one track of the transfer source recording medium (0,
1 code); a storage unit for storing the read data; a determining unit for determining gaps in the data read from the recording medium; writing means for writing data to a transfer destination recording medium; using a recording medium duplication device comprising: reading the data again starting from the gap determined by the determining means and storing it in the storage means; During the gap, an unwritable bit pattern (which can be read but cannot be written by the FDC) that cannot be reproduced by the recording medium controller (hereinafter abbreviated as FDC) is created.
1. A method for duplicating a bit pattern on a recording medium, the method comprising: placing a mark) on a recording medium at a destination, and writing data onto a destination recording medium starting from the gap. 2. The method of copying bit patterns on a recording medium at isolated locations as claimed in claim 1, further comprising the step of: (2) transmitting the read data between the plurality of steps. (3) Data for one track of the transfer source recording medium (0,
1); a recording medium controller that inputs the read data to the writing means; and a determining means that determines whether the recording medium controller can input the read data to the writing means. and, according to the determination means for determining whether or not the input can be input to the writing means, if the input is possible, the read data is input to the recording medium controller means, and if the input is not possible, the read data is input to the storage means. means for switching; storage means for storing the data input from the input switching means; determining means for determining gaps in the data in the storage means; and data input from the recording medium controller means or a writing means for writing data stored in the storage means onto a transfer destination recording medium; and determining whether or not the recording medium controller can input the read data to the writing means. writing the data input from the recording medium controller means to a destination recording medium according to the determination by the determining means that input is possible; and determining whether or not the recording medium controller can input the read data to the writing means. inputting the data read by the input switching means into the storage means according to the determination by the determination means that the input is not possible; a step of reading the data again and storing it in the storage means, and creating an unwritable bit pattern (which can be read but cannot be written by the FDC) that cannot be reproduced by the recording medium controller (hereinafter abbreviated as FDC) during the gap.
1. A method for duplicating a bit pattern on a recording medium, the method comprising: placing a mark) on a recording medium at a destination, and writing data onto a destination recording medium starting from the gap. 4. The method of copying bit patterns on a recording medium at isolated locations as claimed in claim 3, further comprising the step of: (4) transmitting the read data between the plurality of steps.