JPS61220102A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To confirm recorded data without latency after data write by providing a recording head and a reading head side by side. CONSTITUTION:Write data is transferred to this magnetic disc device through an interface part 7. Thereafter, write data is not only written on a recording surface through a data path 9, a write control part 10 and a writing part 11 but also stored in a data comparing part 15. Data written on the recording surface is read out just after write by a reading part 12 and a read control part 13 and is sent to the data comparing part 15. The data comparing part 15 compares write data and read data; and if they do not coincide with each other, the comparing part 15 reports abnormality to a connecting part 8 through a comparison signal 16. Thus, a host device recognizes immediately abnormality of write.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to peripheral devices, and particularly to the structure of a magnetic disk device.

[Conventional technology]

Conventionally, this type of magnetic disk drive cannot record and read data at the same time, so it is necessary to check whether the data has been recorded correctly by reading the same recording location again after recording the data. The drawback was that it was time consuming.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a magnetic disk device that has two heads (reading and writing) that can operate simultaneously and a data comparison circuit, so that reading and writing comparisons can be made at high speed. There is a particular thing.

[Means for solving problems]

The magnetic disk device of the present invention has a data writing head and a continuous reading head, and reads the data written at the time of data writing immediately, and compares the data to be praised with the read data. The present invention is characterized by verifying data written to a disk without waiting for rotation.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the recorded data string 4 is
As a result, the data is written on the data recording surface 1.

The written data is read out by the data reading section 3 after a certain period of time by moving the data recording surface 1 in the direction of the arrow 6. The read data string 5 has the same order and contents as the write data string 4. Write data string 4 and read data string 5
By comparing the data, it can be determined whether the recorded data string 4 is correctly recorded on the data recording surface.

Referring to FIG. 2, the magnetic disk device includes an interface section 7 with the host device, a connection section 8 with the host device, a write data path 9, a write control section 10, and a write section 11.
The write data is passed to the present magnetic disk device through the interface section 7. After that, the write data is transferred to the data path 9, the write control unit 10. The data is written on the recording surface through the writing section 11 and simultaneously stored in the data comparison section 15.

Immediately after, the data written on the recording side is read out by the continuous output unit 12 and the readout control unit 13, and then the data is read out by the data comparison unit 15.
sent to. The data comparison unit 15 compares the write data and the read data, and if they do not match, it notifies the connection unit 8 of the abnormality through a comparison signal 16.

This allows the host device to immediately recognize that the writing was abnormal.

〔effect〕

As described above, the present invention has the advantage of being able to immediately detect unauthorized writing by providing a write head and a read head that can operate simultaneously.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an outline of the operation of the present invention, Figure 2, Figure 1. hair 2 diagram

Claims (1)

[Claims] A magnetic disk device characterized by having a recording head and a reading head side by side to confirm recorded data without waiting for rotation after data is written.