JPH0562331A - Floppy disk device - Google Patents

Abstract

PURPOSE:To prevent erroneous the erasure of the file of an original copy when the file is copied by attaching a write inhibiting switch to the FD device. CONSTITUTION:Write inhibiting switches 101 are each attached to FD devices 103 and 104. Here when the file is copied from the FD device 103 to the FD device 104, the switch 101 of the FD device 103 which is usually maintained in an OFF condition is turned ON and a writing is inhibited. Then, the file from the FD device 103 is written into a read FD device 104 by an FD control device. And, when the copying is completed, the switch 101 of the FD device 103 is returned to an original OFF position. Even when the copying is operated by reading the file from the FD device 104 and writing it into the FD device 103, the erroneous erasure of the file of the original copy is prevented because the FD device 103 is attached with the write inhibiting switch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disk (FD) device, and more particularly to a write protection function of an FD device.

[0002]

2. Description of the Related Art In a conventional FD device, there is no write-protect switch on the device side, and the FD medium has a write-protection mechanism or software write-protection.

[0003]

In the conventional FD device,
Since there is a write-protection mechanism on the medium side, when copying a file between FDs, the copy destination and copy source may be mistaken, and the file may be erased by mistake.

Further, when writing is prohibited, the mechanism attached to the medium is pulled out and set again, or depending on the type of medium, a sticker is stuck or peeled off, or a part of the medium is cut out. Is necessary
There was a risk of damaging the medium itself.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore an object of the present invention is to provide a novel floppy disk device capable of solving the above-mentioned drawbacks inherent in the prior art. Especially.

[0006]

In order to achieve the above object, a floppy disk device according to the present invention has a function of reading a mechanical setting of write prohibition of a floppy disk medium so that writing to the floppy disk medium cannot be performed. And a means for notifying the floppy disk device controller of the write prohibition setting, a switch, a resistor, a logic circuit, and a driver for sending a signal to the floppy disk device controller. A first circuit comprising an electric circuit composed of
Second write-inhibiting means that functions independently of the write-inhibiting means and has the function of prohibiting writing to the floppy disk medium.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the accompanying drawings with reference to the accompanying drawings.

FIG. 1 is an external view of an FD device according to the present invention, and FIG. 2 is a circuit configuration diagram showing an embodiment of a write inhibit circuit of the FD device according to the present invention.

Referring to FIGS. 1 and 2, an F according to the present invention is provided.
The D device is attached to the FD device control device via a cable or the like. Further, the write-protect switch 101 is attached to the entire bezel portion of the FD devices 103 and 104 as shown in FIG. This write protect switch 1
01 is “OFF” during normal use.

Now, in the normal state, the switch 10
Since 1 is “OFF”, the signal line 205 is kept at H level by the resistor 202. Therefore, the output of the logic circuit 203 reflects the signal of the signal line 205 as it is, and if the FD medium 208 is write-protected, the signal line 206 becomes L level, and the logic circuit 203.
Output goes high and the interface driver 20
4 causes the interface signal 209 to go to L level indicating that write protection is valid, and notifies the FD device control unit that write protection is enabled.
As for the self-confidence of the apparatus, the signal 210 for inhibiting the writing operation to the FD medium 208 becomes valid, and the writing operation cannot be performed.

Here, when the write inhibit switch 101 is turned "ON", the signal line 205 is grounded, so that the signal line 205 becomes L level and the output of the logic circuit 203 becomes H level.
It becomes a level. Therefore, the interface signal 209 becomes L level indicating that writing is prohibited, and the FD medium 208 is in the same state as when the writing is prohibited.

Next, an example of how to use the FD device according to the present invention will be described.

First, in normal use, the write inhibit switch 101 is "OFF". At this point, it becomes necessary to copy the file, and the FD device 103 sends the FD
Assuming that a file is to be copied to the device 104, first, the write-protect switch 101 of the FD device 103 of the copy source FD is set to “ON”, and the FD device 103 is turned on.
To write-protection state. Then, the FD device controller reads the file from the FD device 103 and reads the file.
Write to 04. And when the copy is finished, FD
The write protect switch 101 of the device 103 is turned off as before.

If a file is read from the FD device 104 and written to the FD device 103 at the time of copying, the FD device 103 is in a write-protected state and the copy source file is erased by mistake. There is no end.

[0015]

As described above, the FD according to the present invention
According to the device, by attaching a write-protect switch to the conventional FD device, it becomes possible to prohibit writing to the FD without inserting and removing the FD medium one by one, and the file is accidentally erased when the file is copied. At the same time, there is no need to change the write-protection setting of the FD medium, so that the risk of damaging the FD medium is eliminated.

[Brief description of drawings]

FIG. 1 is an external view of an FD device according to the present invention.

FIG. 2 is a circuit configuration diagram showing an embodiment of a write inhibit circuit of an FD device according to the present invention.

[Explanation of symbols]

 101 ... Write inhibit switch 103, 104 ... Floppy disk device 202 ... Resistor 203 ... Logic circuit 204 ... Interface driver 205 ... Signal line 206 ... Signal line 207 ... FD medium write inhibit setting reader 208 ... FD medium 209 ... FD interface signal Line 210 ... Signal line

Claims (3)

[Claims] 1. A floppy disk device in which writing and reading to and from a floppy disk medium are controlled by an external control device, wherein a mechanical setting of write-protection of the floppy disk medium can be read and written to the floppy disk medium. The first write-inhibiting means to be deleted, the means for notifying the floppy disk device controller of the write-inhibiting setting, and the function for operating independently of the first write-inhibiting means to prevent writing to the floppy disk medium A floppy disk device comprising: 2. The second write-inhibiting means receives a manually operated switch, a resistor connected to one contact of the switch and a power source, and a signal line led from the contact. 2. The floppy disk device according to claim 1, further comprising: a logic circuit for controlling the floppy disk device and a driver circuit for inputting an output of the logic circuit to a signal to the floppy disk device controller. 3. The floppy disk drive according to claim 2, further comprising an output of the first write inhibit means connected to another input of the logic circuit.