JPH04205976A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enable a data track to be divided into zones in the radial direction by providing information for obtaining timing for detecting magnetic head positioning information for each sector in an inner circumferential preparatory track for an inner circumferential zone and in an outer circumferential preparatory track for an outer circumferential zone. CONSTITUTION:A data track zone (a) on a magnetic recording medium 1 is divided into the outer circumferential zone (b) and the inner circumferential zone (c), where the outer circumferential preparatory track (d) is provided on the outer side of the outer circumferential zone (b), while the inner circumferential preparatory track (e) on the inner side of the inner circumferential zone (c). Then, the magnetic head positioning information (h) is written in the outer circumference and the inner circumference at intervals of physical sector lengths (f) and (g) respectively. Moreover, at the time of access of the magnetic head to the outer circumferential zone, the sector length (f) of the outer circumferential preparatory track is recognized, and in the case of access to the inner circumferential zone, the sector length (g) of the inner circumferential preparatory track is recognized, so that the timing for the magnetic head positioning information is obtained. By this method, the track zone can be divided in the radial direction under a sector servo system using zone bit recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic disk device, and particularly to magnetic head positioning control using a sector servo method using zone pit recording (hereinafter abbreviated as rZBRJ).

[Prior Art] Conventionally, in the sector servo system, magnetic head positioning control divides a data track on a magnetic recording medium into data blocks, and detects magnetic head positioning information provided for each sector at a constant rate. This was done by reading based on timing.

[Problem to be solved by the invention]

In the sector servo method using conventional ZBR,
Since the magnetic head positioning information was read at a fixed detection timing, even if you tried to divide the data track on the magnetic recording medium into zones in the radial direction to increase the storage capacity, the number of sectors divided for each zone would be different, so Since the position of the magnetic head positioning information for each zone is shifted from zone to zone, it cannot be detected at a constant timing, so there is a drawback that the data track cannot be divided into zones in the radial direction.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to improve the disadvantages of the conventional example, and particularly to provide a timing for detecting positioning information of a magnetic head that is compatible with radial zone division of data tracks on a magnetic recording medium. .

[Means to solve the problem] In the present invention, a data track on a magnetic recording medium.

In a magnetic disk drive that performs positioning control by providing magnetic head positioning information for each sector divided into data blocks, when the data track is divided into two into an inner zone and an outer zone to increase storage capacity. , information for obtaining the detection timing of magnetic head positioning information for each sector is provided in the inner spare trunk for the inner zone, and in the outer spare track for the outer zone. This aims to achieve the above-mentioned objective.

[First Embodiment] Next, a first embodiment of the present invention will be described based on FIG. 1.

The embodiment shown in FIG. 1 shows a sector formant on a magnetic recording medium.

The data 1-rank zone a on the magnetic recording medium 1 is divided into an outer zone b and an inner zone C.

Further, an outer circumferential spare track d is provided outside the outer circumferential zone b, and an inner circumferential spare trunk e is provided inside the inner circumferential zone C, respectively.

The outer circumferential zone b and the outer circumferential preliminary track d are spaced apart by the physical sector length f, and the inner circumferential zone C and the inner circumferential preliminary track e
are divided in the circumferential direction at intervals of physical sector length g.

Furthermore, magnetic head positioning information is written on the outer and inner peripheries at intervals of physical sector lengths f and g.

When the magnetic head accesses the outer zone, it recognizes the sector length f of the outer spare track, and in the inner zone it recognizes the sector length g of the inner spare trunk, and determines the detection timing of the magnetic head positioning information. obtain. This makes it possible to divide the track zone in the radial direction in the sector servo system using ZBR.

[Second Example] Next, a second example is shown in FIG. In the embodiment shown in FIG. 2, the data track on the magnetic recording medium in the first embodiment described above is divided into three or more zones in the radial direction.

In FIG. 2, the data track is divided into three zones. Data track zone a of magnetic recording medium 1
is divided into three in the radial direction into an outer zone i, a middle zone j, and an inner zone k, with a track l at the boundary between the outer zone i and the middle zone j, and a track l between the middle zone j and the inner zone. A trunk m is placed at the boundary.

The boundary trunk 2 has a signal indicating the sector detection timing corresponding to the physical sector length n and p of the outer zone and the inner zone, and the boundary track m has a signal indicating the physical sector length p of the middle zone and the inner zone. Signals indicating sector detection timings corresponding to and q are written respectively.

Here, in the boundary trunk (2 or m) of each zone, the magnetic head can also move to another zone by obtaining the sector detection timing of the destination zone by the sector servo method using ZBR.

The configuration in which information for obtaining timing for detecting magnetic head positioning information as described above is provided in a spare track at the boundary between adjacent zones is the same even when the data track is divided into four or more zones.

[Effects of the Invention] As explained above, according to the present invention, when a data track zone is divided to increase recording density, even if the number of sectors differs for each divided zone, the sector servo method using ZBR can be used. This makes it possible to control the positioning of the magnetic head by using the magnetic disk drive, and it is possible to provide a magnetic disk device that has great effects in increasing the recording capacity and improving the performance of the magnetic disk device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the first embodiment of the present invention;
FIG. 3 is an explanatory diagram showing a sector format on a magnetic recording medium showing the second embodiment, and FIG. 3 is an explanatory diagram showing a sector format on a conventional magnetic recording medium. ■...Magnetic recording medium, a...Data track zone, b...Outer zone, C...
...Inner zone, d...Outer spare track, e
...Inner circumference spare trunk, f...Outer circumference physical sector length, g...Inner circumference physical sector length, h
...Magnetic head positioning information, l...
Outer zone, J... Middle zone, k...
・Inner zone, ρ...Outer/middle boundary trunk,
m...Middle/inner boundary track, n......
Outer physical sector length, p... Middle physical sector length, q... Inner physical sector length, r...
・Sector head. Applicant Ibaraki NEC Co., Ltd. Agent Patent Attorney Yukan Takahashi] 3 illustrations

Claims (1)

[Claims] (1) A magnetic recording medium and a magnetic head for reading and writing information to and from the magnetic recording medium are provided, the data track on the magnetic recording medium is divided into data blocks, and the magnetic head is positioned for each sector. In a magnetic disk device that performs positioning control by providing information, the data track is divided into two zones, an inner zone and an outer zone, and detection timing of magnetic head positioning information for each sector of these two zones is provided. A magnetic disk device characterized in that information for obtaining the information is provided in an inner spare track for the inner circumferential zone, and in an outer spare track for the outer circumferential zone.