JPH0358312A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To accurately position a data head and to prevent the occurrence of an error in reading out caused by the deviation of a data write position by shifting and disposing a servo head and a data head which are oppositely disposed through a disk medium so that the positions in a circumferential direction may not be overlapped with each other. CONSTITUTION:As to the disk medium 1, servo information is written on the surface facing the servo head 2 so as to be used as a servo surface, and the surface facing the data head 3 is used for writing and reading out the data as a data surface. The servo head 2 and the data head 3 are shifted and disposed so that the positions in the circumferential direction may not be overlapped, the information on the servo surface is read out by the servo head 2 and then, the data head 3 is positioned, and also even though a magnetic flux generated in the data head 3 passes through the medium 1 at the time of writing the data, the magnetic flux does not reach the servo head 2 since the position of the servo head 2 is shifted, so that the read-out information from the servo surface is not disturbed and then, the occurrence of the error in reading out caused by the deviation of the data write position can be prevented.

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 positions a head using a servo surface servo method.

[Conventional technology]

FIG. 2 is a plan view and a side view showing an example of a conventional magnetic disk device.

As shown in FIG. 2, in a conventional magnetic disk device that uses a servo surface servo method to position the head, servo information is recorded on one side of a single disk medium 11 to form the servo surface, and the opposite side of the disk medium 11 is The side facing surface is used as a data surface, and a servo head 12 and a data head 1 are arranged facing each other with a disk medium 11 in between.
3 were placed very close together.

[Problem to be solved by the invention]

The conventional magnetic disk device described above uses a servo head to read information on the servo surface and positions the data head to write and read data.
When data is written to the data head facing the servo head, the magnetic flux generated in the data head passes through the medium and reaches the servo head, superimposing it as noise on the servo information read from the servo surface. As a result, the positioning of the data head moves, and the data is written at a different position. During reading, the data head is positioned at the correct position, resulting in a reading error, which is a serious drawback.

[Means to solve the problem]

A magnetic disk device of the present invention positions a head using a servo surface servo method and has a data surface facing the servo surface with a disk medium interposed therebetween. The servo head and the data head that accesses the data surface via the disk medium are arranged in a staggered manner to form an elliptical structure.

〔Example〕

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

FIG. 1 is a plan view and a side view showing an embodiment of a magnetic disk device of the present invention.

In the disk medium 1 shown in FIG. 1, servo information is written on the surface facing the servo head 2 and used as a servo surface, and the surface facing the data head 3 is used as a data surface for writing and reading data.

As shown in FIG. 1, the servo head 2 and the data head 3, which are disposed opposite to each other on both sides of the disk medium 1, are disposed in a staggered manner so that their positions in the circumferential direction do not overlap.

The amount by which the circumferential positions of the servo head and the data head that face each other are shifted is experimentally and statistically determined, and is not necessarily limited to the positional relationship between the servo head and the data head shown in FIG.

〔Effect of the invention〕

As explained above, in the magnetic disk device of the present invention, the servo head and the data head, which are arranged opposite to each other with the disk medium in between, are shifted so that their positions in the circumferential direction do not overlap, so that the servo head When reading information on the servo surface to position the data head and writing data, even if the magnetic flux generated in the data head penetrates the medium, the servo head is misaligned, so the magnetic flux is does not reach the servo head, the read information from the servo surface is not disturbed, data can be written in the correct position without moving the data head positioning, and reading errors due to shifts in the data writing position are prevented. This has the effect of improving the reliability of the magnetic disk device.

[Brief explanation of drawings]

FIG. 1 is a plan view and side view showing an embodiment of a magnetic disk device of the present invention, and FIG. 2 is a plan view and side view showing an example of a conventional magnetic disk device. 1.11... Disk medium, 2.12... Servo head, 3.13... Data head.

Claims (1)

[Claims] A magnetic disk drive in which a head is positioned by a servo surface servo method and has a data surface facing the servo surface with a disk medium in between, includes a servo head that accesses the servo surface, and a servo head that is connected to the servo head through the disk medium. A magnetic disk device characterized in that a data head for accessing a data surface is arranged in a staggered manner.