JPH07141771A - Method for writing data in floppy disk and floppy disk device - Google Patents

Abstract

PURPOSE:To prevent recorded and stored data from being collapsed by causing erroneous writing in an adjacent track due to the deviation of a magnetic head through the vibration or the like applied on a floppy disk drive from outside. CONSTITUTION:The read only data of which use is limited to reading and the contents are not updated and the readable/writable data of which contents are updated among the data to be recorded/stored in a floppy disk are divided into a read only track 1 and read/write track 2 respectively and recorded/stored. In addition, a guard track 3 for the purpose of data protection is provided between the read only track 1 and the read/write track 2. Thus, the collapse of data is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data destruction prevention system in magnetic storage, and more particularly to a data destruction prevention write for preventing destruction of data recorded on a floppy disk due to vibration in a magnetic storage device using a floppy disk. A method and a floppy disk device.

[0002]

2. Description of the Related Art As a method generally used in a conventional data destruction prevention system, the state of a write protect notch (write protection groove) provided in a floppy disk is determined by a protect sensor circuit of a floppy disk device. There is a data destruction prevention method in which the detection signal is supplied to a write protection circuit, and as a result, the write protection circuit performs write prohibition operation on the floppy disk. In addition, a data destruction prevention system that is a further development of this data destruction prevention system has been developed.
No. 211803. The data destruction prevention method described in this publication includes a write protection notch that is conventionally provided in a floppy disk, and a side protection that sets write protection for each of side 0 and side 1 of the floppy disk. A side protect sensor circuit that has a protect notch and detects the state of this side protect notch, a protect sensor circuit, and a side protect notch.
The write protection circuit processes the signal detected by each of the sensor circuits to determine write protection and the write protection circuit that determines the write protection determined by the write protection circuit to protect the write protection of the floppy disk. It is something to do.

[0003]

The above-mentioned conventional data destruction prevention method is effective for preventing data destruction due to a user's operation error, but is in a writable state without the protect notch. When data is being written to the Propy disk, the magnetic head may be displaced due to external factors such as vibration, resulting in erroneous writing of data on adjacent tracks and destruction of that data. The problem of doing so could not be solved.

[0004]

SUMMARY OF THE INVENTION A data writing method for a proppy disk according to the present invention is a method of protecting writable data, the contents of which can be updated, on a floppy disk having a read-only track in which read-only data is written. It is characterized by writing via a guard track intended for.

Further, the floppy disk device according to the present invention writes a floppy disk having a read-only track in which read-only data is written and writable data whose content can be updated next to the read-only track of the floppy disk. A control circuit, and the control circuit writes the write data via a guard track for the purpose of data protection.

[0006]

According to the present invention, even if the data on the adjacent track is destroyed due to the deviation of the magnetic head caused by the vibration applied from the outside while the writable data is being written, the influence thereof can be suppressed. It can fit within the guard track range and does not destroy the data on the read-only track.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a plan view of a floppy disk used in a data writing method according to an embodiment of the present invention. Figure 1
In the floppy disk 10, a guard track 2 for the purpose of data protection is formed outside a read-only track 1 which is a read-only track in which read-only data is recorded and stored, and the read / write can be performed outside the guard track 2. A read / write track 3 which is a writable track on which data is recorded / stored is formed. The sizes of the read-only track 1 and the read-write track 3 can be freely set according to the amount of data recorded and stored in each.

FIG. 4 is a block diagram of a floppy disk device using the floppy disk shown in FIG. In the figure, the floppy disk 10 is rotated by a rotating portion 14. The magnetic head 15 faces the writing and reading sides of the floppy disk 10, and the magnetic head 15 is moved by the stepping motor 12 in the radial direction of the floppy disk. A data input / output circuit 11 is connected to the magnetic head 15. The control circuit 13 controls input and output of data to the data input / output circuit 11, drive control of the stepping motor 12, and rotation control of the rotating unit 14. The control circuit 13 determines which area of the floppy disk 10 to write or read data according to an instruction of software from inside or outside, and controls each unit.

Next, the data writing method of the embodiment of the present invention will be described.

The control circuit 13 sets the read-only track 1 of the floppy disk 10 as a read-only track, and only reads data from this track. When writing data to the floppy disk 10, the control circuit 13 writes data in the read / write track 3 without writing in the guard track 2.
1 and the stepping motor 12 are controlled. Control circuit 1
When data is being written to the read / write track 3 via the data input / output circuit 11 under the control of 3, when the magnetic head 15 is displaced in a certain direction of the read-only track 1 due to an external factor such as a drop, Although erroneous writing occurs in adjacent tracks, in the case of the present embodiment, the influence is suppressed within the set range of the guard track 2. Therefore, destruction of the data recorded / stored in the read-only track 1 is prevented.

The set width of the guard track 2 is determined by the size of the deviation of the magnetic head due to vibration or the like. For example, when the present embodiment is applied to a portable terminal, the setting of the floppy disk device is changed. Magnetic head 15
It suffices to take a width corresponding to the number of phases of the stepping motor 12 driving the. This is based on the fact that it is known from measurement that the magnetic head shifts by the number of phases of the stepping motor 12 when vibrations due to the dropping of the device are applied. Normally, the setting width of the guard track 2 can be freely selected according to the usage environment and the like.

FIG. 2 is a plan view of another floppy disk used in the data writing method of the embodiment of the present invention. The only difference between the floppy disk shown in FIG. 2 and the floppy disk shown in FIG. 1 is that the positions at which the read-only track 1 and the read / write track 3 are arranged are opposite to each other. The configuration and the data writing method are exactly the same.

FIG. 3 is a plan view of still another floppy disk device used in the embodiment of the present invention. The floppy disk shown in FIG. 3 is used when a plurality of readable / writable data exist and cannot be collected in one place. When there are a plurality of readable / writable data in this way, each of them is divided into different read / write tracks for recording / storing, and a plurality of guard tracks are set, for example, by the control circuit 13 of FIG. Of the magnetic head 1 caused by an external factor such as vibration while data is being written to the read / write track 31 in
Even when the shift of 5 occurs and the data is destroyed, the influence can be prevented from reaching the read-only track 1 and the read / write track 32. This is because the control circuit 13 provides the guard track 2 between the read only track 1 and the read / write track 31 and between the read only track 1 and the read / write track 32, respectively.

[0015]

As described above, in the data writing method according to the present invention, two types of data having different usage levels of read-only data and readable / writable data are recorded / saved separately in the read-only track and the read / write track, respectively. Moreover, since a guard track for the purpose of data protection is provided between these two types of tracks and data is written in the read / write track, vibrations may be applied to the floppy disk and the magnetic head may be misaligned, causing adjacent tracks to move. Even if erroneous writing occurs in the data and the recorded / stored data is destroyed, the effect can be minimized. Further, since the measures taken based on the present invention can be implemented only by software, modification of related peripheral hardware is completely unnecessary, and it is easy to implement even for those already used at present. It also has the effect that it can be implemented and reflected at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing a floppy disk used in an embodiment of the present invention.

FIG. 2 is a plan view of another floppy disk used in the embodiment of the present invention.

FIG. 3 is a plan view of still another floppy disk used in the embodiment of the present invention.

FIG. 4 is a block diagram of a floppy disk device according to an embodiment of the present invention.

[Explanation of symbols]

 1 read only rack 2 guard track 3 read / write track 4 read / write track 31 5 read / write track 32

Claims (5)

[Claims] 1. A method for writing data in a device using a floppy disk as a magnetic storage medium, wherein writable data, the content of which can be updated, is protected on a floppy disk having a read-only track in which read-only data is written. A method for writing data on a floppy disk, which is characterized in that writing is performed via a guard track for the purpose. 2. The data writing method for a floppy disk according to claim 1, wherein the guard track is an area where no data is written. 3. The method for writing data on a floppy disk according to claim 1, wherein the writable data is written inside and outside the read-only track via the guard track. 4. A floppy disk having a read-only track in which read-only data is written, and a control circuit for writing writable data whose content can be updated next to the read-only track of the floppy disk. A floppy disk device, wherein the control circuit writes the writable data via a guard track for the purpose of data protection. 5. The floppy disk device according to claim 4, wherein the guard track has a width corresponding to the number of phases of a stepping motor that drives a magnetic head of the floppy disk.