JPS6132220A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To shorten a time required for copying operation by making index signals of two magnetic disks coincident with each other and then writing the contents of one disk on the other directly. CONSTITUTION:An index signal from a disk device 1 is differentiated and then sets a flip-flop circuit 6, and an index signal from a disk device 2 resets the circuit 6, so the circuit 6 is held set for the time difference between both index signals. A clock signal is supplied to a couner 7 during the period and the time difference whicb is clocked is latched by a latch circuit 8 on the arrival of the index signal from the device 2, so that the counter 7 is reset a slight time later. The contents of the latch circuit 8 are converted by a D/A converting circuit 9 into a voltage corresponding to the time difference to control the rotating speed of the motor of the device 2. This operation is repeated and when the time difference decreases to a specific set value and the index signals becomes coincident with each other, a signal WRITE GATE signal is supplied from a controller 3 to the floppy disk device 2 with the output of a detecting circuit 10, so that data read out of the device 1 are written in the device 1 directly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic recording device that copies the contents of a magnetic disk.

[Prior art and its problems]

Conventionally, when copying the contents of a first 70-p disk to a second 70-p disk, the following procedure was required. First, format the second 70 disk, read the contents of the first 70 disk, transfer it to RAM, then read the contents of this RAM and write it to the second 70 disk. Therefore, it took a long time and was not desirable.

〔the purpose〕

An object of the present invention is to reduce the time required for copying by matching the index signals of two floppy disks and then directly writing the contents of one to the other.

〔Example〕

In the drawing, reference numeral 1.2 is a floppy disk device, and in this example, the contents of the floppy disk device 1 are copied to the floppy disk device 2. A controller 3 controls the driving of the floppy disk device 1.2, data exchange, etc. 4.5 is a differentiating circuit which differentiates the index signals from the floppy disk drives R1 and R2, respectively. 6 is a flip-flop circuit, 7 is a counter, 8 is a latch circuit, 9 is a D/
The A conversion circuit 10 is a detection circuit which produces an output when the content of the latch circuit 8 becomes less than a preset value. 11 is a gate circuit, and 12 is a delay circuit.

Next, the operation will be explained. First, the output of the controller 3 drives the motor of the floppy disk device 1.2 (the motor 14 for the floppy disk device 2) to rotate each floppy disk. Each floppy disk rotates at the same speed but asynchronously,
The respective index signals do not match. Transfer the contents of floppy disk device 1 to floppy disk device 2.
To write directly to , the index signals of both must match.

Therefore, each index signal is made to match as follows. The index signal from the floppy disk device 1 is differentiated and then sets the flip-flop circuit 6, and the index signal from the floppy disk device 2 is differentiated and then reset the flip-flop circuit 6. Therefore, the flip-flop circuit 6 is set only during the time difference between each index signal (the index signal from the floppy disk drive 1 is used as a reference, and the index signal from the floppy disk drive 2 is regarded as a delay). . During this time, gate circuit 1
1 is opened, a clock signal is supplied to the counter 7, and the above-mentioned time difference is counted. This time difference is latched into the latch circuit 8 by the arrival of the index signal from the floppy disk device 2. After a slight delay, the counter 7 is reset. The above contents of latch circuit 8 are D/A
The conversion circuit 9 converts the voltage into a voltage corresponding to the time difference, and controls the rotational speed of the motor of the floppy disk device 2. That is, the larger the above time difference, the higher the rotational speed of the motor of the floppy disk device 2.

The above operation is repeated every time an index signal is generated from the floppy disk device 1.2, and the index signal of the floppy disk device 2 approaches that of the floppy disk device 1, and the time difference between the two decreases. When this time difference reaches a preset value and each index signal matches or almost matches, the detection circuit 1
Output from o occurs. This output causes the controller 3 to send the floppy disk device 2 K WRITE!
The GATFX signal is supplied, and data that is constantly being read from the floppy disk device 1 is written directly to the floppy disk device 2.

〔effect〕

According to the present invention, after the index signals of the two magnetic disks are matched, the contents of one are written directly to the other, so the time required for copying can be shortened.

[Brief explanation of drawings]

The drawing is a logic circuit diagram showing an embodiment of the present invention. 1.2...Floppy disk device 3... Controller 6...Flip-flop circuit 7...Counter 8...Latch circuit 9...I)/A conversion circuit 10...detection circuit that's all

Claims (1)

[Claims] A magnetic recording device that copies the contents of one magnetic disk to another magnetic disk includes a detection circuit that receives an index signal from each of the magnetic disks and detects a time difference between the two, and a rotational speed of the magnetic disk according to the time difference. and a write control circuit that directly writes the contents of the one magnetic disk to the other magnetic disk after the index signals match.