JPH02226548A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To use one magnetic disk device for multipurpose and to prevent data from being erased by misoperation by providing plural input ports and a recording division circuit. CONSTITUTION:When the command of operation is inputted from one of CPUs connected to the plural input/output ports 1a in an input/output circuit part 1, the circuit part 1 transmits a control signal to a switching circuit 2. When the circuit 2 receives the signal, it transmits an occupation signal which shows that the self device is occupied to other input/output ports 1a in the circuit part 1. Based on the instruction of division from a storage area division circuit 3, an access area to a disk device 5 is limited. After the data transmitted from the CPU is stored in a buffer memory 4, it is stored in the specified storage area of a disk storage part 5 optionally set by the circuit 3. With such constitution, the device is connected to two or more CPUs and made versatile. By dividing the recording area, data recorded by one CPU is prevented from being erased by the other by misoperation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device that can increase the number of magnetic disk devices and prevent valuable data from being erased due to erroneous operation. Regarding equipment.

[Prior Art] Conventionally, this type of magnetic disk device had a maximum of two input/output circuits, each connected to a central processing unit, and shared data recorded on the magnetic disk.

[Problems to be Solved] The conventional magnetic disk device described above can only be connected to two central processing units at most, and when connected to two central processing units, the recording area of the magnetic disk will be shared. There was a possibility that data recorded by one device could be erased by the other device due to an erroneous operation.

The present invention has been made in view of the above-mentioned problems.
An object of the present invention is to provide a magnetic disk device that has a plurality of input/output ports and a recording area dividing circuit, so that one magnetic disk device can be used in multiple ways, and can prevent valuable data from being erased due to erroneous operation.

[Means for Solving the Problems] In order to achieve the above object, a magnetic disk drive of the present invention includes at least two parts: an input/output circuit section having an input/output port, a disk storage section for storing data, and a disk storage section. This configuration includes a storage area dividing circuit that arbitrarily divides and sets a storage area, and a switching circuit that sends an occupancy signal to an input/output section and switches the connection of the disk storage section.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a magnetic disk device according to an embodiment of the present invention.

In the drawings, reference numeral 1 denotes an input/output circuit section, which has at least two input/output ports la therein. The input/output circuit section 1 is connected to a plurality of central processing units (not shown), and sends a control signal to a switching circuit 2, which will be described later, in response to an operation command from one of the central processing units.

When the switching circuit 2 receives a control signal from one input/output port la of the input/output circuit section l, the switching circuit 2 determines that the other input/output port la of the input/output circuit section l is occupied by the present magnetic disk device. It sends out an occupancy signal to the effect that it is occupied, and also performs vc continuation switching of the disk storage section 5, which will be described later.

Reference numeral 3 denotes a storage area dividing circuit, which arbitrarily divides and sets the storage area of the disk storage unit 5, which will be described later, for each input/output port 1a.

A buffer memory 4 temporarily stores data sent from the central processing unit.

The disk storage unit 5 stores data sent from the central processing unit, and its storage area is divided by the two-record memory dividing circuit 3.

Therefore, according to the magnetic disk drive having such a configuration, when an operation command is input from one of the central processing units connected to the plurality of input/output ports 1a of the input/output circuit section 1, the input/output circuit section 1 sends a control signal to the switching circuit 2. When the storage circuit 2 receives a signal from the input/output circuit section 1, it sends an occupancy signal to the other input/output port 1 of the input/output circuit section 1 indicating that one device is occupied.

At the same time, the access area to the disk storage section 5 is restricted based on the division instruction from the storage area division circuit 4. The data sent from the central processing unit is temporarily stored in the buffer memory 4, and then stored in a predetermined storage area of the disk storage section 5 arbitrarily set by the storage area division circuit 3.

[Effects of the Invention] As explained above, according to the magnetic disk device of the present invention, by having a plurality of input ports and a recording division circuit, one magnetic disk device can be used for multiple purposes, and data erasure due to erroneous operation can be achieved. It has the effect of being able to prevent

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a magnetic disk device according to an embodiment of the present invention.

Claims (1)

[Claims] An input/output circuit section that has at least two or more input/output ports, a disk storage section that stores data, a storage area division circuit that arbitrarily divides and sets the storage area of the disk storage section, and sends an occupancy signal to the input/output section. and a switching circuit for switching the connection of the disk storage unit.