JPH02270175A - Magnetic head positioning controller for magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To ease the restriction of a track format by controlling the positioning of a magnetic head based on sector servo information, and controlling the positioning of the magnetic head for a specific track based on index servo information. CONSTITUTION:A sector/index servo circuit 17 outputs the positioning information to position a data head 11 to a head positioning control circuit 20 based on a servo signal corresponding to sector servo information 22. A reference servo circuit 19 outputs the positioning information necessary for seeking up to a target track to the head positioning control circuit 20 based on the servo signal from a servo head 12. That is, a specific track 23 where sector servo information 22 is not recorded is provided on a recording medium 10, and the magnetic head 11 is positioned based on the index servo information 25. Thus the restriction of the track format of the recording medium 10 can be eased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic head positioning control device for a sector servo type magnetic recording/reproducing device.

(Prior Art) Conventionally, a hard disk drive uses a magnetic head positioning control device for positioning a magnetic head to a target track on a recording medium based on servo information. The magnetic head positioning control device utilizes sector servo information recorded for each sector of each track of the recording medium.
There is a sector servo method that positions a magnetic head at the center of a target track. In this sector servo method, sector servo information is recorded in a part of each sector, and normal data is recorded in the other data areas.

Since the recording area of sector servo information is determined in advance,
The area that can be used as a data area will be limited. Therefore, in the sector servo method, the degree of freedom in track format is restricted.

(Problem to be Solved by the Invention) In the sector servo system, sector servo information is recorded in a specific area for each sector, so it is limited to the range specified by the normal data area company, and the flexibility of the track format is becomes restricted.

An object of the present invention is to provide a magnetic head positioning control device for a magnetic recording/reproducing device that is capable of increasing the degree of freedom of track format for a specific track of a recording medium in a sector servo system, and as a result, easing restrictions on the track format. Our goal is to provide the following.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a first head positioning control means for controlling the positioning of a magnetic head based on sector servo information, and an index recorded in an index area of a specific track. This magnetic head positioning control device includes a second head positioning control means for controlling the positioning of a magnetic head with respect to a specific track based on servo information.

With such a configuration, since the positioning of the magnetic head is controlled based on the index servo information on a specific track of the recording medium, normal formatting of the data area can be executed relatively freely.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a magnetic head positioning control device for a hard disk drive according to the same embodiment. As shown in FIG. 1, the hard disk device is provided with a plurality of recording media 10 that are fixed disks, and a data head 11 corresponding to the data surface of each recording medium IO and a servo head 12 corresponding to the servo surface are provided. It is provided. The recording medium 10 is rotated by a spindle motor 13.

Each head 11, 12 is attached to a carriage 14, and as the carriage 14 moves, it seeks in the radial direction of the recording medium 1G. The carriage 14 is moved by a carriage drive circuit 15 to cause each head 11, 12 to seek.

On the other hand, the head switching device 1G switches each data head 11 and outputs a read signal or a servo signal output from a designated data head 11. The sector/index servo circuit 17 moves the data head 11 to the center of the target track of the recording medium 10 based on a servo signal according to the sector servo information or a servo signal according to the index servo information output from the parallel-serial conversion circuit 16. Head positioning control circuit 20 transmits positioning information for positioning.
Output to.

The read/write circuit 1B performs a data reproduction operation based on the read signal output from the head switching device 16.

On the other hand, the servo head 12 reproduces servo information from the servo surface of the recording medium 10 and outputs the servo signal to the reference servo circuit 19. The reference servo circuit 19 is the servo head 1
Based on the servo signal from 2, each data head 11 outputs positioning information necessary for seeking to the target track to the head positioning control circuit 20. The head positioning control circuit 20 controls the carriage drive circuit 15 based on device determination information constituted by each servo circuit 17, 19.
The movement of the carriage 14 is controlled through.

Next, the operation of this embodiment will be explained. In the recording medium 10 of the same embodiment, sector servo information ff122 is recorded for each sector of each track 21, as shown in FIG. Furthermore, the recording medium 10 has specific tracks (for example, two tracks) 23 on which the sector servo information 22 is not recorded.
is provided. In the specific track 23, the recording medium 1
Index area (index gap) near 0 index position (rotation reference position) 24
Index servo information 25 is recorded therein.

When the target track (target cylinder) of the data surface to be read/written is specified by the host system while the recording medium IO is being rotated by the motor 13, the positioning control of the data head 11 with respect to the target track is performed. The operation begins. First, the servo head 12 reproduces servo information from the servo surface and outputs a servo signal to the reference servo circuit 19. Reference servo circuit 19
outputs positioning information necessary for the data head 11 to seek to the target track on the data surface' to the head positioning control circuit 20. As a result, the head positioning control circuit 20 controls the carriage I4 to move 1;
The data head 11 and servo head 12 are caused to seek to the target track.

Next, the mode is shifted to a mode for positioning the data head 11 designated for switching by the head switching device 16 at the center of the 1'' mark track. specified data head 1
1 reproduces the sector servo information 22 recorded in each sector of the target track, and outputs the servo signal to the sector/index servo circuit 17 through the head switching device 1B. The sector/index servo circuit 17 outputs positioning information for positioning to the center of the target track to the head positioning control circuit 20. As a result, the data head 11 is positioned at the center of the target track.

On the other hand, when the target track is the specific track 23, the data head 11 designated for switching reproduces the index servo information 25 and outputs the servo signal to the sector/index servo circuit 17 through the head switching device 16. The sector/index servo circuit 17 outputs positioning information for positioning the specific track 23 to the center of the target track to the head positioning control circuit 20 . This causes the data head 11 to move to the specific track 2.
It will be positioned at the center of the No. 3 target track.

In this way, the data head 11 is positioned at the center of the target track 21 based on the sector servo information 22, and the data head 11 is positioned at the center of the target track, which is the specific track 23, based on the index servo information 25. . In other words, a specific track 23 on which no sector servo information 22 is recorded is provided in advance, and the data head 11 is directed to this specific track 23.
It is possible to control positioning and read/write data. Specific track 23 is sector servo information 22
Since no data is recorded, there is a high degree of freedom in the track format when setting a relatively normal data area.

[Effects of the Invention] As described in detail above, according to the present invention, in the sector servo system, by performing positioning control using index servo information, it is possible to provide a specific track that does not use sector servo information. Therefore, by using a specific track with a high degree of freedom in track format, it is possible to alleviate the restrictions on the track format of the recording medium.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of a magnetic head positioning control device according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing the structure of a recording medium of the same embodiment. lO...recording medium, l...data head, 12.
... Servo head, 17... Sector/index servo circuit, 19... Reference servo circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] a first head positioning control means that performs positioning control of the magnetic head based on sector servo information recorded for each sector of each track of the recording medium; and index servo information recorded in an index area of a specific track of the recording medium. A magnetic head positioning control device for a magnetic recording/reproducing apparatus, comprising: second head positioning control means for controlling the positioning of the magnetic head with respect to the specific track based on the magnetic head positioning control means for controlling the positioning of the magnetic head with respect to the specific track.