JPS6145478A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To express the volume of information to be recorded in a magnetic disc always clearly by forming a means for detecting and discriminating the volume of signals to be recorded in the magnetic disc and a means for displaying the residual discriminated by a residual detecting means. CONSTITUTION:When a microcomputer (MP) 12 detects the loading of the magnetic disc into a magnetic disc device from a magnetic disc detecting part 15 and when the MP 12 decides that a write permission signal is inhibited, a signal for moving the magnetic head 6 up to a control track is transmitted from the MP 12 to a head moving circuit 16 through a change-over switch 14. The circuit 16 moves the magnetic head 6 up to the control track and the MP 12 reads the information such as the using status of the disc 5 through the head 6, a reading circuit 8, a demodulator circuit 10, and a reading RAM 11 and displays the volume of information to be recorded on a residual display part 4.

Description

[Detailed Description of the Invention] Technical Field> The present invention involves loading a magnetic disk having a plurality of tracks for recording and reproducing information or video signals and a management track for recording and reproducing usage status, etc. into a magnetic disk storage section, and storing information or video signals. The present invention relates to a magnetic disk device for recording and reproducing video signals.

<Prior art> In a conventional magnetic disk device using a magnetic disk, such as a floppy disk device, the amount of information that can be recorded on the floppy disk inserted in the floppy disk device is detected and displayed. do not have the means to do so. Therefore, the computer to which the floppy disk device is connected determines information regarding the usage status of the floppy disk via the floppy disk device controller, and information that can be recorded on the character display connected to the computer. I was trying to display the amount. Therefore, in the floppy disk device, when the computer starts some operation, the display regarding the amount of recordable information displayed on the character display will disappear. For example, if the computer is running a program that requires many operations to record information on a 70 tsupee disk device, it may attempt to record information even though the 70 tsupee disk has already run out of room to record information. It will be. It would be good if the program running on the computer had a built-in countermeasure for such cases, but if it was not built-in, it would be impossible to record information on the 70T disk, or even important information would be erased. This will result in

<Object of the Invention> The present invention has been made in view of the above points, and provides a method for constantly displaying the amount of information that can be recorded on a magnetic disk so that the amount of information that can be recorded on the magnetic disk can always be known. It is an object of the present invention to provide a magnetic disk device having the following structure.

<Structure of the Invention> In order to achieve the above object, the magnetic disk device of the present invention stores a magnetic disk having a plurality of information or video signal recording and reproducing tracks and a management track for recording and reproducing usage status etc. in a magnetic disk storage unit. In a magnetic disk device inserted into a magnetic disk and used to record and reproduce information or video signals, a remaining amount detecting means detects and determines how much signal can be transferred to the magnetic disk, and the remaining amount detecting means 4! Equipped with a remaining amount table means that displays the remaining amount determined by! It is a sign.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is a layout diagram of the remaining amount display means, and shows the magnetic disk drive 1.
On the front side, there are an LED (light emitting diode) 2 that lights up when the magnetic disk drive 1 is selected, an ejector 3 used when ejecting a magnetic disk, and a remaining amount display section 4 as a remaining amount display means.

FIG. 2 is a block diagram of an embodiment of the present invention, in which numeral 4 indicates a remaining amount display section, 5 a magnetic disk, 6 a magnetic head, 7 a carriage, 8 a reading circuit, and 9 a remaining amount detecting means. The amount detecting section 16 is a magnetic head moving circuit.

With the above configuration, the magnetic disk 5 is connected to the magnetic disk device 1.
When the microcomputer 12 detects that the magnetic disk is loaded into the disk by the magnetic disk detection unit 15 and when the microcomputer 12 determines that the write permission signal has changed from write permission to prohibition, the microcomputer 12 sends a control message to the head movement circuit 16. A signal for moving the magnetic head 6 to the track is sent via the magnetic head movement signal changeover switch 14. Upon receiving this signal, the magnetic head moving circuit 16 moves the magnetic head 6 via the carriage 7 to the management track. Information such as the usage status of the magnetic disk 5 is recorded on this management track, and this information is sent to the magnetic head 6 and the reading circuit. , information signal changeover switch 13. Microcomputer 12 via demodulation circuit 10° readout RAM (random access memory) 11
reads the information, and sends a signal to the remaining amount display section 4 based on the information to display the amount of information that can be recorded. When this series of processing is completed, the microcomputer 12 sends a signal to the magnetic head moving circuit 16 to return the magnetic head 6 to its original track. In this way, since the amount of information that can be recorded is always displayed, information can be reliably recorded on the magnetic disk.

<Effects of the Invention> As described above, according to the present invention, by being able to always know the amount of information that can be recorded on a magnetic disk, it is possible to use the magnetic disk effectively and to reliably record information or video signals on the magnetic disk. becomes.

[Brief explanation of the drawing]

FIG. 81 is a layout diagram of a display means according to an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 1...Magnetic disk device, 2...LED. 3... Ejects, 4... Remaining amount display section,
5...Magnetic disk, 6...Magnetic head,
7... Carriage, 8... Readout circuit, 9... Remaining amount detection unit, 10... Demodulation circuit,
11...RAM for reading. 12... Microcomputer, 13... Information signal changeover switch, 14... Magnetic head movement signal changeover switch, 15...
-Magnetic disk detection section, 16...magnetic head movement circuit.

Claims (1)

[Claims] (1) A magnetic disk device that records and reproduces information or video signals by inserting a magnetic disk having multiple information or video signal recording/reproducing tracks and a management track for recording/reproducing usage status, etc. into a magnetic disk storage section. In,
It is characterized by comprising a remaining amount detecting means for detecting and determining how much signal can be recorded on the magnetic disk, and a remaining amount table means for displaying the remaining amount determined by the remaining amount detecting means. magnetic disk device.