JPH0371470A - Write protection device - Google Patents

Abstract

PURPOSE:To prevent data written anytime transiently while work is performed by arranging a write protect switch at equipment which handles the storage medium of a computer. CONSTITUTION:A write protect signal is sent from a write protect signal sending means 5 to a control unit 1 with the operation of a detecting switch 7a which detects the on-operation of the write protect switch 7. The control unit 1 prohibits the write of write data based on the write protect signal sent from the write protect signal sending means 5, and displays the fact that the write is being prohibited on a display means 8. Thereby, it is possible to prevent the write performed transiently in the middle way of the work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the control of reading and writing data to a storage medium of a computer, and particularly to a write protection device for preventing data from being written against the user's will.

[Prior Art] A computer is equipped with a device for writing data from write 1 to a storage medium inserted into a writing target device according to a command from a control unit.

Conventionally, in this device, when it is desired to prohibit writing to a storage medium, the storage medium is processed to prevent writing, such as by pasting a protection sticker on the storage medium or breaking a protection claw.

[Problem H to be solved by the invention] However, in the conventional write protection method described above, processing is applied to the storage medium, so even if the device handling the storage medium is the same, the storage medium cannot be replaced. If the device is replaced, it may not be possible to prevent the device from being replaced, or if the storage medium is stored inside the device, it may not be possible to tell from the outside whether it has been protected or not. However, there are various disadvantages in that even if it is desired to prevent writing, it is difficult or impossible.

[Means for Solving the Problems] The technical means of the present invention for solving such problems is to cause a device to write write data to a storage medium inserted into a writing target device according to a command from a control unit. An attached write protection device, which includes a write protection switch that can be turned on and off;
A write protect signal sending means for sending out a write protect signal by turning on the write protect switch, and a write prohibition for prohibiting the control unit from writing write 1 data based on the write protect signal sent from the write protect signal sending means. and display means for displaying that writing is prohibited based on a write protect signal sent from the write protect signal sending means.

[Example] Hereinafter, a write protect device according to an example of the present invention will be described based on the accompanying drawings.

The write protection device according to the embodiment is shown in FIGS. 1 and 2.
As shown in the figure, it is attached to a device that writes write data 2 into a storage medium 4 inserted into a device 3 to be written, in response to a command from a control unit 1.

The storage medium 4 inserted into the device 3 to be written is a floppy disk drive, and is provided with a write protect claw 6 that instructs to prohibit writing to the storage medium 4 by being folded to the negative side. Further, the writing target devices 3 are provided in two stages, upper and lower.

This write protect device includes a write protect switch 7 which is provided near the medium insertion part of the write target device 3 and is turned on and off, and a write protect signal sending means 5 which sends out a write protect signal when the write protect switch 7 is turned on. It is equipped with That is,
This write protect signal is sent from the write protect signal sending means 5 to the control unit 1 by the operation of the detection switch 7a which detects the ON operation of the write protect switch 7. This control unit 1
has a function as a write inhibiting means for inhibiting writing of the write data based on the write protect signal sent from the write protect signal sending means 5. The embodiment also includes display means 8 for displaying the write-protection status based on the write protect signal sent from the write protect signal sending means. This display means 8 is realized by providing, for example, a lamp (not shown) at an appropriate position on the writing target device 3. In addition, in the embodiment, the write protect signal is transmitted from the write protect signal transmitting means 5 by the control unit 1 when the detection switch 6a detects that the write protect claw 6 of the storage medium 4 is broken. and is configured to be sent to the display means 8.

Therefore, according to this write protect device, when the write protect switch 7 installed in the write target device 3 such as a disk drive is pressed, the write protect signal is transmitted from the write protect signal sending means 5 to the control unit 1 and the display. This prevents the write data 2 from being written to the storage medium 4 such as a floppy disk, and displays on the display means 8 that writing is prohibited. Further, even if the write I protection claw 6 is set by the storage medium 4, writing is similarly prevented.

If neither the write protect switch 7 nor the write protect claw 6 provided by the storage medium 4 is closed, the write I/data 2 from the control unit 1 is written to the storage medium 4.

[Effects of the Invention] As explained above, according to the write protect device of the present invention, by installing a write protect switch in equipment that handles computer storage media, it is possible to prevent data from being written against the user's will during work. It has the effect of being able to temporarily prevent it at any time and protect the data in the storage medium.

Furthermore, since it can be recognized by the display means that writing is prohibited, there is an effect that the operating state can be easily grasped.

[Brief explanation of drawings]

1 is a configuration block diagram showing a write protect device according to an embodiment of the present invention, and FIG. 2 is an external view of the write protect device according to the embodiment. 1: Controller unit (CPU) 2 Write data 3: Write target device 4: Storage medium 5 Write protect signal sending means 6: Write protect claw 7: Write block 1 Switch

Claims (1)

[Claims] A write protection device that is attached to a device that writes write data to a storage medium inserted into a device to be written to based on commands from a control unit.
A write protect switch that is turned off, a write protect signal sending means that sends out a write protect signal when the write protect switch is turned on, and a write data output by the control unit based on the write protect signal sent from the write protect signal sending means. 1. A write protection device comprising: write protection means for prohibiting writing; and display means for displaying that writing is prohibited based on a write protection signal sent from a write protection signal sending means.