JPS6025063A - Write control system for positioning information - Google Patents

Abstract

PURPOSE:To prevent completely positioning information from being out of phase by generating a position and an address signal in single-time writing. CONSTITUTION:A clock and a write start signal which are sent out externally are received, and the position signal Sp and address signal Sa are sent out of a position signal generating circuit 11 and address signal generating circuig 12 to an OR circuit 14 and put together into a composite signal Sig, which is inputted to an amplifier 15. On the other hand, a mode designating signal is sent out to a write gate generating circuit 13, which outputs a write gate signals WG1 or WG2 to the amplifier 15 on the basis of the mode designating signal. The amplifier 15 amplifies the composite signal Sig selectively only in a period wherein the signal synchronizes with the inputted WG1 or WG2, and sends out a write signal to a writing head 6 set at a prescribed position previously by a driving part to write corresponding information on a magnetic disk.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a positioning information writing control system, and in particular to an address as a head position control signal in a control system called a sector servo system for magnetic disk (including floppy disk) devices. This invention relates to a writing control method for signals and position signals.

(bl) Prior Art and Problems In recent years, the sector servo method has been in the spotlight as one of the position control methods for magnetic disks.

As shown in Fig. 1, this method uses a position information area 2 and a data signal area 3 within the data surface of a disk 1 for data signals.
In this method, position information is written in the position information area 2, the data head itself reads this position information, and this is used to control the position of the head.

In this sector servo method, a position information area 2 and a data signal area 3 are provided in a storage area (track) concentrically defined within the data surface of a magnetic disk, and the position information area 2 is as shown in FIG. Normal position signal area 4
and an address signal area 5 indicating the absolute trunk position, and position signals P-0, P-1, and P-1, respectively.
-2,... and -0 to the address signal. 8-1, A-2,
... is written. The above address signal A-0, A-
1, A-2, ... have the same positional relationship (positional relationship in the radial direction of the disk) as the corresponding data tracks 3-0.3-C3-2, ... provided in the data signal area 3. This is information indicating the corresponding data track number. In addition, position signals po, p-i, p-2,
. . is information for detecting the positional change of the magnetic head, and the data tracks 3-0.3-1.3-2.
... is written at a position shifted by 1/2 trunk pitch.

A conventional method of forming such a signal is shown in FIG.

First, as shown in FIG. 3A, the data head 6 is set at the data track 3-0, and a position signal P-0 and an address signal ^-0 are written. Next, the same figure (b
), the data head 6 is set to the track width (T
W) is moved in the radial direction by 1/2, and a position signal P-1 and an address signal 0 are written. Next, the same figure (C
1, the data head 6 is moved by TW/2 and the position signal P-1 and address signal A-1 are written. Furthermore, the data head 6 is moved by TW/2, and the position signal P-2 and address signal A-1 are written.

By repeating these operations in sequence, the sector servo information shown in FIG. 2 is formed.

The conventional sector servo information writing method described above uses position signals P-0, P-1, P-2°, and
... and address signals A-0, A-1, A-2, ...
Both are formed by writing the same information separately for each half track. Since one trunk is written and formed in this way, if the writing timings of both are shifted, signal distortion will occur during reading, and accurate position information will not be obtained.

FIG. 4 is a diagram showing an example of the phase shift of the magnetization pattern that occurs when the write timing for each upper and lower half track is shifted.

(C) Object of the Invention An object of the present invention is to provide a positioning information writing control method that can form the above position signal and address signal by writing each one once.

(d) Structure of the Invention The present invention is characterized by a data signal area for storing data signals in a storage area concentrically defined within the data surface of a magnetic disk, and a data signal area arranged on the same circumference as the storage area. and an address signal area for storing an address signal corresponding to the storage area, and data for writing/reading information to/from the data signal area, which are arranged to be shifted in position in the radial direction by approximately 1/2 of the width of the storage area. and a position signal area for storing a position signal used for detecting a radial positional deviation between the head and the storage area, and an address signal and an address signal are provided in the position information area as positioning information of the data head. When writing the position signal, first and second write modes are provided in which the radial position of the data head corresponds to the same circumference as each of the position signal area and the address signal area, and In the first write mode, a position signal is written in the position signal area, and in the second write mode, an address signal is written in the address signal area.

Embodiment of the Invention An embodiment of the invention will be described below with reference to FIGS. 5 to 7.

Fig. 5 is a diagram schematically showing the positioning information writing procedure of this embodiment, Fig. 6 is a block diagram showing the main part configuration of the positioning information writing device used in this embodiment, and Fig. 7 is a diagram showing the main part configuration of the positioning information writing device used in this embodiment. FIG. 3 is a timing diagram showing write timing.

This embodiment will be described using an example in which data is written sequentially from the outermost circumference toward the center in a plurality of concentrically arranged tracks. First, as shown in FIG. 5(al), the data head 6 is positioned on the same circumference as the outermost position signal area, and the position signal P-0 is written in the position signal area.

The radial position of this position area is a position further shifted by TW/2 in the outer circumferential direction from the outermost data trunk 3-0.

The above write operation is performed in the positioning information writing device shown in FIG. 6, in response to a clock and a write start signal sent from the outside, and a position signal S is sent from a position signal generation circuit 11 and an address signal generation circuit 12, respectively.
p and the address signal Sa are sent to the OR circuit 14,
The signals are combined by the OR circuit 14 and the combined signal Sig is input to the amplifier 15. On the other hand, a mode designation signal is sent to the write gate creation circuit 13, and the write gate creation circuit 13 outputs the write gate signal WGI or 2 to the amplifier 15 based on the mode designation signal. The amplifier 15 amplifies the composite signal Sig and receives the input -G1 or W.
Only the period synchronized with G2 is selected and amplified, and the drive unit (
(not shown) sends a write signal to the write head 6 set at a predetermined position, and corresponding information is written on the magnetic disk.

In the case of FIG. 5 Ta), the first write mode is designated and write gate penalty 1 is sent out, so the position signal po is written in the outermost periphery of the position signal area.

Next, as shown in FIG. 6B, the write head 6 is moved by TW/2 toward the center of the magnetic disk. At this time, the second write mode is specified (light game)
2 is sent to W, and address signal A-0 of data track 3-0 corresponding to the outermost address signal area is written.

Next, the writing head 6 is moved again by TW/2 toward the center in the radial direction, and the position signal P-1 is transferred to the second position signal area from the outside as shown in the same figure (C1).
Write.

Thereafter, this operation is sequentially repeated to write predetermined signals in all position signal areas and address signal areas.

FIG. 7 is a timing chart showing the timing of the above-mentioned writing, in which ■ indicates the first mode, ■ indicates the second mode, and ■ indicates the head movement period.

In this embodiment described above, since the positioning information is written to both the position signal and the address signal in one write operation, the occurrence of phase shift that occurs in the conventional writing method is completely prevented. .

The present invention is not limited to the above embodiment, but may be implemented with further modifications.

For example, in the above embodiment, the head was moved half track pinch at a time to write position signals and address signals alternately, but instead of this, the head was moved one trunk pitch at a time and the position signal area (or address signal area ) may be written over the entire area first, and then the address signal area (or position signal area) may be sequentially written over the entire area.

In short, two write modes are provided when positioning information is written, and in each of these two write modes, only one of the position signal area and address signal area is written.

(f) As described in detail, according to the present invention, by forming the position signal and the address signal in one write operation, it is possible to completely prevent the occurrence of a phase shift in the positioning information.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining a conventional positioning information writing method, and FIG. 1 is a plan view showing a magnetic disk;
FIG. 2 is a diagram schematically showing the structure of the data track of the magnetic disk, FIG. 3 is a diagram explaining the conventional sector servo information writing method, and FIG. 4 is a diagram schematically showing the phase shift state of the magnetization pattern. Figures 5 to 7 are diagrams showing one embodiment of the present invention. Figure 5 is a diagram schematically showing the writing procedure of the above embodiment, and Figure 6 is a diagram showing the writing procedure of the above embodiment. FIG. 7 is a block diagram showing the configuration of the positioning information writing device, and a timing chart showing the writing timing of the above embodiment.

Claims (1)

[Claims] A data signal area for storing data signals and an address signal arranged on the same circumference as the storage area and corresponding to the storage area are stored in a storage area concentrically defined within the data surface of the magnetic disk. The address signal area and the storage area are arranged at positions shifted in the radial direction by approximately 1/2 t2 of the width of the storage area, and information is written to/from the data signal area.
a position information area consisting of a data head for reading and a position signal area for storing a position signal used for detecting a positional deviation in the radial direction with respect to the storage area;
When writing an address signal and a position signal in the position information area as positioning information of the data head, the radial position of the data throat is set on the same circumference as each of the position signal area and the address signal area. A first and a second write mode corresponding to the above are provided, and in the first write mode, a position signal is written in the position signal area, and in a second write mode, an address signal is written in the address signal area. Characteristic positioning information writing control method.