JPH0453064A - Disk driving device - Google Patents

Abstract

PURPOSE:To miniaturize the disk driving device by detecting the index position of a recording medium and outputting an index signal based on a servo data in a guard band area. CONSTITUTION:When a power source is turned ON, a magnetic head 3 is moved in the direction of an outer guard band 16 and starts detecting the position of an O track. At such a time, the servo data is read and it is decided whether the detected position is the position of the band 16 or the index position. This decision is executed based on signals detecting servo data 18A and 18B in servo zones 20a-20d detected by the head 3. Since discriminating the servo zone only of the data 18B among these detecting signals, it is decided that the zone 20a is the index position, the index pulse is outputted from a CPU 8, and a head driving circuit 10 controls the drive of the magnetic head 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk drive device that drives information recording media such as floppy disks and hard disks, and more particularly to a disk drive device whose drive is controlled by an index signal obtained based on servo data.

[Conventional technology]

When driving the magnetic disk, a reference position W in the rotational direction of the magnetic disk is used to control writing and reading of information.
, (index position) are used to perform writing and reading at predetermined positions on the disk. In order to generate this index signal, an index sensor is built into the motor, and the index signal is output from the sensor. Alternatively, address bits and index bits are recorded on a magnetic disk, and an index signal is output from the magnetic disk based on the address bits and index bits.

[Problem to be solved by the invention]

The aforementioned motor with a built-in index sensor and output of an index signal had problems in that the index sensor was expensive and required space to incorporate the index sensor, which hindered miniaturization of the entire device. .

Furthermore, the method of recording address bits and index bits on a magnetic disk and outputting an index signal by reading these address bits and index bits requires a dedicated and complex detection circuit, which increases the complexity of the device. There was a problem with manufacturing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk drive device that does not require any special sensor or detection circuit, and can detect the index position of a disk and output an index signal with a simple configuration.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a disk-shaped information recording medium having a data area in which a recording track on which information data is recorded, and a guard band area located at the periphery of the data area. , a rotational drive means for rotationally driving the information recording medium, a head device for writing or reading information on or from the information recording medium;
In a disk drive device comprising a transport means for transporting the head device, a detection means detects an index position of the information recording medium based on servo data written in the guard band area and outputs an index signal. This is a configuration with .

[Effect]

In the present invention, an index signal is generated by detecting an index signal from servo data written in a guard band area of an information recording medium.

Therefore, no index sensor is required, and
No dedicated complex circuitry is required to detect index bits or addresses.

〔Example〕

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

1 to 5 show an embodiment of the present invention, and FIG. 1 is an explanatory diagram showing data writing positions on a magnetic disk,
FIG. 2 is an explanatory diagram showing the main part configuration, FIGS. 3 and 4 are signal waveform diagrams showing the operation, and FIG. 5 is a flowchart showing the operation.

As shown in FIG. 2, a magnetic disk 2 is attached to a rotating shaft 1a of a motor 1, and the rotation of the motor 1 drives the magnetic disk 2 to rotate. Record information on the magnetic disk 2 by directly facing the magnetic disk 2.
A magnetic head 3 for reproduction is provided.

A regenerative amplifier 5 is connected to the input/output terminal of the magnetic head 30, and the output terminal of the regenerative amplifier 5 is connected to the A
It is connected to the D conversion circuit 7.

The output terminal of this AD conversion circuit 7 is connected to the CPU 8,
A head drive circuit 10 is connected to the CPU, and the head drive circuit 10 is configured to transport and drive the magnetic head 3 to a predetermined track position on the magnetic disk 2.

As shown in FIG. 1, a levitation protection area 11 is formed on the surface of the magnetic disk 2 where the magnetic layer is formed, and an inner guard band 12 and data are recorded in this levitation protection area 11 from the inner circumferential side. Contact start and stop zone cc, which is the starting point and ending point of the magnetic head's levitation.
ss zone) 13, a data zone 15 where information data is recorded, and an outer guard band 16.

The outermost circumference of the data zone 15 is 0 track, and the innermost circumference is 614 tracks in this embodiment.

Furthermore, the floating guarantee area 11 of the magnetic disk 2 is divided into a plurality of sectors in the circumferential direction, and in the embodiment, four servo zones 20a to 20d are formed at the center of the magnetic disk 2, and these servo zones include , servo data used for driving the magnetic head 30 to move to a predetermined track is written therein.

The servo zones 20b to 20d are divided into upstream and downstream sides in the rotation direction R of the magnetic disk 20, and servo data (B burst) 18A and servo data (A burst) 18B are written in each. The outer guard band 16 of the servo zone 20a serves as a servo zone for index signal detection, and only servo data 18B is written therein.

Further, as the magnetic disk 2 rotates, the above-mentioned magnetic head 3 moves to the servo zones 20a to 20 (1 servo data 1).
8A and 18B are detected one after another, and these detection signals are input to the CPU 8 after signal processing by the regenerative amplifier 5, the detection circuit 6, and the AD conversion circuit 7. Then, from these detection signals inputted after signal processing, C
The detection signal from the servo zone 20a is detected by the PU8.
The signal is configured to be determined as an index signal.

Next, the output operation of the index pulse in the above embodiment will be explained.

In the disk drive device, when the power is turned on, the magnetic head 3 moves in the direction of the outer guard band 16 and starts detecting the track position. At this time, the servo data is read in step S1 in FIG. The process then proceeds to step S2, where it is determined whether the detected position is at the outer guard band 16 position. Step S
If the determination in step 2 is YES, the process advances to step S3, where it is determined whether the position is an index position.

The determination in step S3 is based on the servo data 18A, 18 of the servo zones 20a to 20d detected by the magnetic herad 3.
This is done based on the detection signal of B.

These detection signals are amplified and shaped by a regenerative amplifier 5, detected by a detection circuit 6, AD converted by an AD conversion circuit 7, and inputted to the CPU. These servo zones 20b~
By determining the servo zone with only servo data 18B among the detection signals from 20d, the servo zone 20
Determine that a is an index position. If the determination in step S3 is YES, the process proceeds to step S4, where an index pulse is output from the CPtJ8, and based on this index pulse, the drive control of the magnetic head 3, that is, writing and reading, is performed by the head drive circuit ]0. .

If the determination in step S2 is No, the process proceeds to step S5, where the magnetic head 3 seeks in the outer circumferential direction, and returns to step S to read servo data using the guard band. Further, if the determination in step S3 is No, the process proceeds to step S6, where the next servo data is read, and the servo data of the servo zones 20b, 20c, and 20d are read one after another, and the servo data of the servo zones 20a
Reading is performed until the servo data of 1 is read.

Figure 3 shows a timing chart of the above-mentioned operation, in which an index pulse is output for each guard band - After detecting the servo data corresponding to the index as described above, the method of outputting the index pulse during normal playback/recording is shown. It is shown in Figure 4. In FIG. 4, T is the period of the index pulse, and t is the timer waiting time set in consideration of fluctuations in the rotational speed of the Senna motor 1 and the servo time interval. This timer is built into CPtJ8. To output the index pulse during normal playback/recording after detecting the servo data corresponding to the index pulse, at the detection position of the first servo data after the waiting time has elapsed since the detection of the servo data corresponding to the index pulse. Output index pulse from CPU.

According to the embodiment configured in this manner, there is no need to separately provide an index sensor or incorporate a complicated detection circuit for reading index bits and address bits, as in the conventional example, and manufacturing costs can be significantly reduced. Also,
By saving space for the index sensor and the detection circuit, the entire device can be miniaturized.

Further, the servo data written in the servo zones of the outer guard band 16 can be easily configured by varying the arrangement of the servo zones corresponding to the index positions. Since this detection also detects differences in the arrangement of servo data, it is possible to accurately and stably detect the index position without erroneous detection.

In the above embodiment, a case was explained in which four servo zones were provided on the magnetic disk, but the present invention is not limited to the embodiment. For example, only one servo zone may be provided corresponding to the index position. The index position can be detected even when the servo is not being used.

Furthermore, in the embodiments described above, the case where it is provided in the outer guard band region has been described, but the present invention is not limited to the embodiment, and it may be provided in the inner guard band region.

〔Effect of the invention〕

As explained above, the present invention eliminates the need for an index sensor or a dedicated complicated detection circuit as in the conventional example, significantly reducing manufacturing costs, and simplifying the overall structure, resulting in miniaturization.

[Brief explanation of the drawing]

FIGS. 1 to 5 are diagrams explaining one embodiment of the present invention,
Figure 1 is an explanatory diagram showing the data writing position of the magnetic disk, Figure 2 is an explanatory diagram showing the main part configuration, Figures 3 and 4.
The figure is a signal waveform diagram showing the operation, and FIG. 5 is a flowchart showing the operation. 1...Motor, 2...Magnetic disk, 3...Magnetic head, 5...
......Regenerative amplifier, 6......Detection circuit, 7...AD conversion circuit, 8...
...cpU, 10...Head drive circuit. Figure Figure

Claims (1)

[Claims] A disk-shaped information recording medium having a data area in which a recording track on which information data is recorded and a guard band area located at the periphery of the data area, and a rotational drive means for rotationally driving the information recording medium. In a disk drive device comprising a head device for writing or reading information to or from the information recording medium, and a transport means for transporting the head device, the servo data written in the guard band area is 1. A disk drive device comprising a detection means for detecting an index position of the information recording medium and outputting an index signal based on the index position of the information recording medium.