JPS6217299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting state monitoring system for a floppy disk device.

In recent years, floppy disk (also called flexible disk or diskette) devices, which use thin magnetic disks inserted into rectangular jackets, have become popular as external memories for data input/output devices, office computers, or terminal devices. In this floppy disk device, when a floppy disk is attached to a driver, the door of the driver is usually opened and the door is closed after the disk is attached. Conventionally, when the driver door is opened due to an operator's mistake while the floppy disk device is being accessed, that is, during reading or writing, the driver sends a non-operation signal (NOT READY signal) to the controller. The floppy disk device stops operating. After this, the operator inspected the floppy disk device so that it could be accessed again. However, in this conventional method, when the floppy disk device is not being accessed, that is, when neither read nor write operations are being performed, the driver door is opened by mistake by an operator or the like, and the driver Even if the floppy disk in the floppy disk is replaced with another floppy disk, the inoperable signal is not sent, so after the next access operation starts, another floppy disk other than the desired one is accessed, and therefore, There is a problem in that the reliability of the floppy disk device is low because erroneous data may be read or undesired data may be written and the file may be destroyed.

The object of the present invention is based on the concept of monitoring the label of a floppy disk, and after the floppy disk is properly installed, a label containing a magnetically written identification code of the floppy disk is stored in a memory in advance. If the door of the driver into which the floppy disk is installed is opened later, the label of the floppy disk currently in the driver is compared with the label stored in memory and the original floppy disk is installed. If it is determined that a floppy disk is installed, access to the floppy disk is continued, and on the other hand, if it is determined that a floppy disk different from the original floppy disk is installed, access to the floppy disk is continued. The machine will stop and an error message will be displayed to instruct the operator to insert the original floppy disk, which may cause incorrect data to be read or undesired data to be written and the file to be destroyed. The object of the present invention is to improve the reliability of a floppy disk device by preventing the above-mentioned problems in the conventional system.

The present invention will be explained below with reference to the drawings.

The attached figure is a block circuit diagram of a floppy disk device to which an embodiment of the present invention is applied. In the figure, a driver 2 is a device for mounting and driving a floppy disk (not shown), and has a door (not shown) installed at its mounting opening. If this door is open, driver 2 will receive a non-operational signal (NOT READY signal)
"a" is sent to the controller 5, and on the other hand, when the door is closed, the driver 2 sends a ready signal (READY signal) "b" to the controller 5. Further, flag 4 indicates whether or not the floppy disk installation work is normal. For example,
When the value of flag 4 is "1", it indicates a normal mounting operation, and when the value of flag 4 is "0", it indicates a non-regular mounting operation. First, the case where a new floppy disk is installed will be explained. In this case, the value of the flag 4 is set to "1" by operating the key 6 to indicate that the mounting work is normal.
Thereafter, when the floppy disk is attached to the driver 2, the operable signal "b" is sent to the controller 5 following the disable signal "a" as the door is opened and closed. As a result, controller 5
In response to the value of flag 4 being "1", reads out the label which is the identification code of the floppy disk, transfers it to the memory 3, and rewrites the value of flag 4 to "0". Next, the controller 5 sends an access enable signal "c" indicating that the driver 2 can access the floppy disk to the CPU (Central
Ptocessing Unit (Central Processing Unit) 1. In this manner, when the value of flag 4 is "1", the label of the floppy disk is read and written into memory 3.

Next, assume that the door of the driver 2 is opened or closed by mistake by an operator or the like while the floppy disk is accessible as described above. For example, assume that the operator unintentionally opens the door of the driver 2, or that a non-person in charge accidentally replaces the floppy disk with another floppy disk.
In such a case, as the door is opened and closed, the operable signal "b" is sent to the controller 5 following the inoperable signal "a". In this case, when the controller 5 receives the inoperable signal "a", it sends an access enable signal "d" indicating that the driver 2 cannot access the floppy disk.
Send to CPU1. Next, the controller 5
In response to the value "0" of flag 4, the label of the floppy disk in driver 2 and the label in memory 3 stored in advance are compared. As a result, if the two labels match, the controller 5 sends an access enable signal "c" to the CPU 1, which makes the floppy disk accessible again. In this case, the controller 5 continues to send out the access enable signal "d" and causes the display device 7 to display an error message. In this way, when the value of the flag is "0" and the door of the driver 2 is opened or closed, the label of the floppy disk currently existing in the driver 2 and the label of the original floppy disk stored in advance are As a result, if it is determined that the original floppy disk is attached to driver 2, access to the floppy disk continues, and it is determined that it is different from the original floppy disk. If this occurs, an error message is displayed instructing the operator to return the original floppy disk.

According to the present invention, when a floppy disk is replaced by another floppy disk due to an operator's mistake, reading of erroneous data can be prevented, and undesired data can be prevented from being written. This makes it possible to prevent the file from being damaged by being inserted into the floppy disk, thereby improving the reliability of the floppy disk device and helping to solve the problems of the conventional system described above.

[Brief explanation of the drawing]

The attached figure is a block circuit diagram of a floppy disk device to which an embodiment of the present invention is applied. Explanation of symbols, 1...CPU, 2...Driver,
3...Memory, 4...Flag, 5...Controller, 6...Key, 7...Display device.

Claims (1)

[Claims] 1. In a floppy disk device equipped with a driver for mounting a floppy disk and a controller for controlling the driver, a memory for storing a label of the floppy disk and an indication as to whether or not the mounting operation of the floppy disk is normal. a flag, in which the label of the floppy disk is stored in advance in the memory when the flag indicates a normal mounting operation, and when the flag does not indicate a normal mounting operation, the When the door of the driver is opened or closed, the label of the floppy disk in the driver is compared with the label stored in the memory, and if the two labels match, the floppy disk is accessed. 1. A method for monitoring the mounting state of a floppy disk device, characterized in that if the two labels do not match, access to the floppy disk is stopped and an error is displayed.