JPS61294673A - Correction system for magnetic head position of magnetic recorrding and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the position shift of a magnetic head by providing a part where a magnetic head positioning signal is written on a magnetic medium. CONSTITUTION:When data is read out of or written on the optional track of the magnetic medium 1, magnetic heads 7-9 are moved to the outermost periphery of the medium 1 and positioned at a fine part 3. Then, when the outputs of magnetic head positioning signal tracks 4 and 6 are smaller than the preset level of a playback level comparing circuit 11, it is judged that there is not history of data, and a positioning signal is written on tracks 4 and 6 only at the fine part. Further, when data is written on an inner peripheral surface side of the medium 1, the heads 7-9 are moved on the basis of the tracks 4 and 6 at the part 3. Then, when the outputs of the tracks 4 and 6 are larger than the set level of the circuit 11, it is judged that there is the history of data on the medium 1. In this case, the heads 7-9 are moved according to the output of a 4 and 6 playback level comparing circuit 12 and corrections are made until the outputs of the tracks 4 and 6 become equal to each other.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic recording/reproducing system, in particular to maintaining compatibility of a magnetic medium and a magnetic recording/reproducing device, and improving the reliability of recorded and reproduced data. It is something.

[Background of the invention]

Conventionally, in magnetic recording and reproducing devices with small storage capacity,
Positioning of the magnetic head has relied solely on the accuracy of the magnetic head drive device. In addition, in terms of accuracy, data erasing heads are installed at both ends of the magnetic head (data read/write head), and a section where no data is recorded is created in the rear and rear directions to provide margin against data reading errors due to magnetic head misalignment. Therefore, no consideration was given to the positioning of the magnetic head depending on the position of data recorded on the magnetic medium. Therefore, the present invention focuses on positioning the magnetic head with respect to the data recording position. Related systems of this type include, for example, Japanese Patent No. 5954029 and Japanese Patent No. 5954051.

[Purpose of the invention]

An object of the present invention is to prevent the positional deviation of the magnetic head by providing a portion on the magnetic medium in which a magnetic head positioning signal is written in a system in which a magnetic head and a magnetic medium are in close contact with each other to record and reproduce data. The goal is to improve media compatibility and data reliability.

[Summary of the invention]

Conventional magnetic head positioning was determined by a magnetic head drive device, so the data recording position was at position K of the magnetic recording/reproducing device where the data was first written on the magnetic medium. When other magnetic recording/reproducing devices (IC) and this magnetic medium are installed, the position where the data is written and the position of the magnetic head that reads the data may deviate due to fluctuations and temperature changes between the devices. If this deviation is large, data reading errors will occur, and no matter how many times the data is read, the magnetic head will remain misaligned and cannot be corrected.
It was impossible. Therefore, the present invention was made with the focus on the fact that if the position of the magnetic head itself is corrected according to the data position of the magnetic medium on which data is recorded, there will be no data reading errors. That is, Kf on magnetic medium
This is characterized in that it is possible to read and write head positioning signals.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Book! ! In this embodiment, a floppy disk is used as an example.

When reading or writing data on a given track in the magnetic medium 1, the magnetic heads (7, 8, 9) are moved to the outermost periphery of the magnetic medium 1 and positioned at the minute portion 5. Next, if the output of the magnetic head positioning signal track 4.6 from the magnetic head positioning head is smaller than a preset level via the positioning signal reproducing circuit 10 and the reproduction level comparison circuit 11, the magnetic medium 1 is processed and the history of the data is determined. When formatting is performed, only the minute part (outermost circumference) K of 1 is used to position the magnetic head through the positioning signal writing circuit 14 using the output of the busy playback level comparison circuit 11 and the effective output circuit of the track 00 sensor circuit 15. Write positioning signals to signal track 4.6. At this time,
In order to prevent write signal interference, the output of the data write circuit 17 is prohibited.

Further, when data is written to the inner circumferential side of the magnetic medium (in this case, the magnetic head (7, 8, 9) is moved by the magnetic head drive circuit 15tC based on the magnetic head positioning signal tracks 4, 6 of the minute portion 5 of 1). At this time (other than the outermost periphery) 9, for example, when writing data in the minute portion 2 of 1, the output of the positioning write circuit is prohibited, the erase current output circuit is enabled, and the output of the data write circuit 17 is transferred to the data track 5. The output of the erase current output circuit 16 is passed through the erase heads 8 and 9 to the magnetic head positioning signal tracks 4 and 6 to provide a data erase section, and data is written to the data track 5 through the data head 7. Prevent interference.

Next, when the outputs of the magnetic head positioning tracks 4 and 6 are higher than the preset level of the reproduction level comparison circuit 11, the magnetic medium 1 determines that there is a history of data, and the magnetic head (7, 8, 9) is located in the minute portion 5 of 1, the output of the positioning signal writing circuit 14 is prohibited to prevent the magnetic head positioning signal tracks 4 and 6 from being destroyed.

In the case of a magnetic medium with a data history, the magnetic head (71L9) is moved depending on the magnitude of the output of the reproduction level comparison circuit 11 and the output of the reproduction level comparison circuit 12. now,
When the magnetic head (71819) is shifted to the magnetic head positioning signal track 4 side, the output level of the magnetic head positioning signal track 4 becomes higher than the output level of the magnetic head positioning head 9, and the output level difference is calculated as the playback level of 4 and 6. Comparison circuit 1
The magnetic head drive circuit is operated by the output of ff
The 1fi head (7, 8e9) is moved to the magnetic head positioning track 6 side, and correction is performed until the outputs of the magnetic head positioning signal tracks 4 and 6 become the same K.

According to this embodiment, there is an effect that data reading errors due to magnetic head positional deviation are significantly reduced.

〔Effect of the invention〕

According to the present invention, data reading errors due to positional deviation K of the magnetic head are significantly reduced, and compatibility between different recording and reproducing apparatuses is also improved.

[Brief explanation of the drawing]

The figure is a diagram showing the positional relationship between a magnetic medium and a magnetic head and the position control of the magnetic head in an embodiment of the present invention. 1... Magnetic medium (floppy disk) 5... Data track 11... Reproduction level comparison circuit 15... Magnetic head drive circuit 14... Positioning signal writing circuit 15... Track 00 sensor circuit 16. ...Erase current output circuit 17...Data write circuit 18...Data reproduction circuit

Claims (1)

[Claims] A magnetic head position correction method for a magnetic recording/reproducing device is characterized in that it is possible to read and write a magnetic head positioning signal on a magnetic medium in a system consisting of a magnetic head in close contact with a magnetic medium, a magnetic head drive device, and a magnetic medium.