JPH01213882A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce the burden of a software and to shorten a writing time by simultaneously revolving main and sub storage media and controlling the writing operation of the two media. CONSTITUTION:When a writing instruction to include prescribed information is inputted from a host device to a controller CL7, the CL7 decodes this instruction and gives a cylinder address to a positionner PS6. Then, the positioning of magnetic heads 4-1-4-n, 4'-1-4'-n on a cylinder is instructed and the magnetic heads are moved in a (b)-direction. At such a time, the positioning condition of the respective heads to the cylinder is reported from the PS6 to the CL7. Next, reading is started from the head, which corresponds to a designated track address, out of the respective heads to correspond to respective storing media 1 and 2 and a writing record is retrieved with reading a record address, which is recorded in advance, by the CL7. When the address concerned is detected, receiving data are sent to the corresponding head and the same data are recorded to the same parts of the media 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device used as an external memory in a computer system.

[Conventional technology]

Conventionally, this type of magnetic disk device has been equipped with two magnetic disk mechanisms that separately write the same data to external memory in order to increase the reliability of data stored in external memory. .

[Problem to be solved by the invention]

However, in this type of magnetic disk device, since commands are issued to each magnetic disk mechanism by software, there is a problem in that the software is burdensome. Furthermore, since the recording media of the magnetic disk mechanism are rotated separately, there is a problem in that it takes a lot of time to write data.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic disk device that can reduce the burden on software and shorten data writing time.

(Means for Solving the Problems) A magnetic disk device according to the present invention includes two storage media, a primary storage medium and a secondary storage medium, which are attached to a rotating shaft rotated by a motor and are arranged in parallel with each other at a predetermined interval, and a a head assembly having a magnetic head for writing and reading, which is movable forward and backward in the head; a positioner connected to the head assembly and controlling the forward and backward movements of the magnetic head; The storage medium also includes a controller that controls writing of data to the storage medium.

[For production]

In the present invention, two write operations can be performed simultaneously by rotating the primary and secondary storage media simultaneously.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a diagram illustrating the outline of a magnetic disk device according to the present invention, and FIG. 2 is a perspective view showing a storage medium of the magnetic disk device according to the present invention.

In the figure, what is indicated by numerals 1 and 2 are two primary and secondary storage media arranged in parallel with each other at a predetermined interval.
It is mounted on a rotating shaft 4 that is rotated at a constant speed by a motor 3. Reference numeral 5 denotes a head assembly extending in the axial direction of the rotating shaft 4, which converts electrical signals into magnetic signals and writes them onto the storage media 1 and 2), and which converts electrical signals into magnetic signals and writes them onto the storage media 1 and 2. A large number of magnetic heads 4-1 to 4-n, 4'-1 to convert magnetic signals recorded on the
4'-n, which are provided on the sides of both the storage media 1 and 2 so as to be movable forward and backward. 6 is the magnetic head 4-1 to 4-4;
-n, 4'-1 to 4'-n, and is connected to the head assembly 5, and is connected to the magnetic heads 4-1 to 4-n, 4'-1 to 4'-n. '-n position. A controller 7 is connected to the positioner 6 and the head assembly 5 for controlling the writing of the same data to the same portion of both storage media 1 and 2. Further, Sl.S2 is a cylinder, and T+'Tz.T is a track.

In the magnetic disk drive configured in this way, the motor 3 simultaneously rotates the primary and secondary storage media 1°2 in the direction indicated by arrow a in FIG. 1, and the positioner 6 moves the head assembly 5 in the same direction. By moving in the direction indicated by the arrow, two write operations can be performed simultaneously. That is, when a write command including a cylinder address, track address, record address, and data is input from the host device to the controller 7 via point A shown in FIG. give a cylinder address to the magnetic heads 4-1 to 4-n,
4'-1 to 4'-n are instructed to be positioned on the cylinder and moved in the b direction mentioned above. At this time, the positioner 6 sends the magnetic heads 4-1 to 4-4 to the controller 7.
The positioning of n, 4'-1 to 4'-n to a predetermined cylinder reports the status. Next, among the magnetic heads 4-1 to 4-n and 4'-1 to 4'-n corresponding to each storage medium 1.2, for example, the magnetic head 4-2.4' corresponds to the designated track address. Reading is started from -2, and the record to be written is searched for by reading the record address recorded in advance by the controller 7. and,
When the designated record address is detected, the write data received from the host device is sent to the magnetic head 4-3, 4'-3, for example, and the same data is recorded in the same portion of both storage media 1 and 2. Thereafter, when the writing is completed, the controller 7 reports it to the host device via point A.

Here, data is recorded concentrically at positions on the medium determined by cylinders and tracks. It is also assumed that the data area determined by cylinders and tracks is divided into records, and the addresses of the records are written in advance in both storage media 1.2.

〔Effect of the invention〕

As explained above, according to the present invention, there are two primary and secondary storage media attached to a rotating shaft rotated by a motor and parallel to each other at a predetermined interval, and a writing/submerging medium provided on the side of these storage media so as to be able to move forward and backward. A head assembly having a magnetic head for reading, a positioner connected to the head assembly to control the forward and backward movement of the magnetic head, and a positioner connected to the positioner and the head assembly to write data to both storage media. Since the controller is provided, both storage media can be rotated simultaneously to perform two write operations at the same time. Therefore, unlike the conventional method, instructions are not issued to each magnetic disk mechanism, so the burden on software can be reduced. Further, by simultaneously rotating both storage media, data writing time can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the outline of a magnetic disk device according to the present invention, and FIG. 2 is a perspective view showing a storage medium of the magnetic disk device according to the present invention. 1.2...Storage medium, 3...Motor, 4...
・Rotating axis, 4-1 to 4-n, 4'-1 to 4'-n...
-Magnetic head, 5...Head assembly, 6...Positioner 57...Controller. Patent applicant: NEC Corporation

Claims (1)

[Claims] A head assembly comprising two primary and secondary storage media attached to a rotating shaft rotated by a motor and parallel to each other at a predetermined interval, and a magnetic head for writing and reading that is provided on the sides of these storage media so as to be movable forward and backward. and,
A magnetic device characterized by comprising: a positioner connected to the head assembly to control forward and backward movement of the magnetic head; and a controller connected to the positioner and the head assembly to control writing of data to both storage media. disk device.