JP2850828B2 - Magnetic recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus, and more particularly, to a magnetic recording apparatus using a sector servo system. More specifically, the present invention relates to a recording / reproducing preamplifier circuit and a recording / reproducing method.

As a method for positioning a recording / reproducing head of a magnetic recording apparatus, when the number of magnetic recording surfaces is large, one of the magnetic recording surfaces is used as a servo disk to write a positioning signal. A disk servo system has been used conventionally. However, if the number of magnetic recording surfaces is not so large due to the recent miniaturization of the magnetic recording device, or if the servo disk is not used for increasing the capacity, the magnetic recording surface for recording the recording information signal is not used. A servo sector in which a positioning signal is recorded;
2. Description of the Related Art A method for reducing the size and increasing the capacity of a magnetic recording apparatus by adopting a sector servo method for writing a data sector on which a recording information signal is recorded has been generalized.

In a magnetic recording apparatus employing the sector servo system, it is necessary to reduce the time required for switching between a servo sector and a data sector to achieve a larger capacity.

[0004]

2. Description of the Related Art FIG. 3 is a waveform diagram for explaining a recording / reproducing operation in a conventional magnetic recording apparatus and a magnetic recording method and a schematic diagram showing a configuration of a sector, and shows a magnetic recording apparatus using a sector servo system. 2 shows a conventional sector configuration. As shown in FIG. 3, within the sector, a servo sector (S) 21 in which a positioning signal is recorded,
It is divided into a data sector (D) 22 on which a recording information signal is recorded. For this reason, the recording / reproducing magnetic head is positioned based on the positioning signal of the servo sector 21.

Since it is necessary to position the recording / reproducing magnetic head also at the time of recording the recording information signal, even when recording the signal on the data sector 22 in the recording state,
On the servo sector 21, the positioning signal must be reproduced as a reproduction state. Therefore, in the magnetic recording apparatus using the sector servo method, when recording the recording information signal, the recording state and the reproduction state are alternately switched at a high speed.

Therefore, the servo sector 21 and the data
An invalid data sector 28 exists at the boundary of the sector 22 as a void area where the recording information signal cannot be recorded or reproduced. The invalid data sector 28 avoids the inconvenience of erroneously erasing the data in the servo sector 21 and the data sector 22 due to uneven rotation of the disk, a delay in the recording current, and the like. Further, the switching response area is retracted from when the reproduction amplifying unit changes from the stop state to the execution state until the envelope of the reproduction output signal 26 is stabilized.

In particular, since the invalid data sector 28 requires several microseconds as a switching response time until the envelope of the reproduced output signal becomes stable after the reproduction amplifier shifts from the stop state to the execution state, this envelope is required. It is also used to secure time for stability.

In the conventional magnetic recording apparatus, as shown in FIG. 3, the R / W gate 23 simultaneously determines the execution state or the stop state of the recording amplification means and the reproduction amplification means. Here, when the R / W gate 23 is in the recording state 24, the recording / amplifying means is in the execution state, the reproduction / amplification means is in the stop state, and when the R / W gate 23 is in the reproduction state 25, the reproduction / amplification means is in the execution state. The recording amplification means is in a stopped state.

Therefore, in the conventional magnetic recording apparatus,
At the time of recording the recording information signal, from the start point of the servo sector 21 where the R / W gate 23 switches from the recording state 24 to the reproducing state 25, the reproducing amplifying means changes from the stopped state to the executing state. The envelope of the reproduction output signal 26 of the servo sector 21 of the reproduction amplification means is not stabilized until the switching response time 27 until the envelope of the reproduction output signal 26 stabilizes.

[0010]

As a result, between the data sector 22 and the next servo sector 21, in order to avoid a switching response area, a gap area where a signal cannot be recorded or reproduced is formed. Large invalid data sector (D *
) 28 had to be provided.

Therefore, in the conventional example, there is a disadvantage that the data sector in the sector cannot be relatively enlarged. That is, the recording density cannot be effectively increased.

As described above, in the magnetic recording apparatus using the sector servo method, there is a large void area in which the recording information signal cannot be recorded or reproduced. There is a problem that the void area becomes an obstacle.

On the other hand, in the prior art, the output gain of the AGC amplifier for automatically adjusting the amplitude of the reproduction output signal is fixed during the switching response from the recording to the reproduction of the reproduction amplifier, so that the reproduction output signal is fixed. (See, for example, Japanese Patent Application Laid-Open No. 5-314407). As a result, the switching response time of the AGC output is shortened, and the capacity of the magnetic recording device can be increased.

However, the problem of the prior art in this case is that in the region where the envelope of the reproduced output signal is unstable, even if the output gain of the AGC amplifier is fixed,
Since the output signal of the AGC amplifier remains unstable,
Until the envelope of the output signal of the amplifier stabilizes, the gap region to avoid the switching response region remains large.

The reason is that, in the prior art, the gain of the AGC amplifier is simply fixed in order to eliminate the disturbance of the AGC amplifier, so that the switching response time from recording to reproduction of the reproduction output signal of the reproduction amplifier is improved. The point is not.

Japanese Patent Laid-Open Publication No. Hei 5-12805 has an area for storing a sector pulse, an ID area for storing ID information indicating the start and address of a sector, and a data storage area for storing data. In a disk device that writes / reads data to / from a sector whose format is specified, a sector (n) immediately before a target sector n for writing / reading data is used.
-1) The ID area is read, and based on the ID information read from the ID area, the target sector n is recognized. When the head detects the next sector pulse, the write gate or read gate is opened and the data is read. Is described.

According to this known example, it is possible to reduce the area of the air gap for each sector and thus to increase the storage capacity of the disk device, but on the other hand, it is necessary to switch between the write gate and the read gate. However, there is a problem that control is complicated.

An object of the present invention is to solve such a problem of the prior art. In a magnetic recording apparatus using a sector servo method, after a reproducing amplifier shifts from a stop state to an execution state, The gap area due to the switching response time until the envelope of the reproduction output signal stabilizes can be reduced, the range of invalid data sectors can be reduced, and the data sectors within the sector can be relatively large, and therefore, It is an object of the present invention to provide a magnetic recording device capable of increasing a recording density.

[0019]

In order to achieve the above-mentioned object, a magnetic recording apparatus according to the present invention comprises a magnetic sector having a servo sector on which a positioning signal is recorded and a data sector on which a recording information signal is recorded. A disk, a magnetic head for reproducing a positioning signal and a recording information signal recorded on the magnetic disk and recording a recording information signal output from a host device in a data sector, and a magnetic head for reproducing a positioning signal reproduced from a servo sector. Control means for controlling the positioning of the magnetic head by means of the magnetic head, reproduction amplifying means for amplifying the positioning signal reproduced by the magnetic head, and recording amplifying means for amplifying the recording information signal recorded in the data sector by the magnetic head. I have. Further, the first control is such that when the control means transitions from the recording state of the recording information signal by the magnetic head to the reproduction state, the reproduction is performed by the reproduction amplification means before the recording amplification means is stopped on the servo sector. It has a configuration with functions.

Here, the control means can control the reproduction amplification means separately from the control on the recording amplification means in consideration of the time until the signal output from the reproduction amplification means is stabilized. The need for a void area until the signal is stabilized is eliminated.

[0021]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the magnetic recording apparatus of the present invention. FIG. 2 is a waveform diagram for explaining the operation of the magnetic recording apparatus and the magnetic recording method according to an embodiment of the present invention, and a schematic diagram showing the configuration of a sector.

As shown in FIG. 1, the magnetic recording apparatus of the present invention comprises a magnetic disk 11 having a servo sector 31 on which a positioning signal is recorded and a data sector 32 on which a recording information signal is recorded. A magnetic head 16 reproduces a positioning signal and a recording information signal recorded on the disk 11 and records a recording information signal output from a host device in a data sector.

In addition, the magnetic recording device operates the magnetic head 16 in accordance with the positioning signal reproduced from the servo sector 31.
Control means 14 for controlling the positioning of the magnetic head 16, reproduction amplifying means 13 for amplifying the positioning signal reproduced by the magnetic head 16, and recording amplifying means 12 for amplifying the recording information signal recorded in the data sector 32 by the magnetic head 16. It has.

The control means 14 controls the magnetic head 16
Transition from the recording state of the recording information signal to the playback state
Of the recording amplification means 12 on the servo sector 31
The first step is to execute the reproduction by the reproduction amplification means 13 before the stop.
With control function.

[0025] Furthermore, in a preferred embodiment, the control unit 1
4, a processing means 15 for outputting a gate signal according to the interval between the servo sectors 31 on the magnetic disk 11 is also provided. In this case, the control unit 14, Ru comprises a second control function of controlling the operation of the reproducing amplifying means 13 and the recording amplifier means 12 on the basis of a gate signal outputted from the processing unit
Good.

This will be described in detail.

As shown in FIG. 2, the processing means 15 outputs a gate signal (clock) corresponding to the interval between servo sectors. Then, the control means 14 generates a write gate signal 34 and a read gate signal based on the gate signal.

The write gate 34 controls the timing at which the recording / amplifying means 12 enters the execution state or the stop state, and the read gate 35 controls the reproduction / amplification means 1.
3 is controlled to be in the execution state or the stop state.

As shown in FIG. 2, the magnetic recording apparatus according to the present embodiment, when transitioning from the recording state to the reproducing state,
That is, after performing signal recording in the recording state by the data sector 32 and then performing positioning in the reproduction state by the servo sector 31, the control means 14 and the processing means 15 cause the recording amplification means 12 to perform recording by the write gate 34. Before stopping, the reproduction and amplification means 13
Performs the regeneration by the read gate 35,
The respective timings of the write gate 34 and the read gate 35 are determined.

Therefore, according to the magnetic recording apparatus and the magnetic recording method of the present invention, at the time of recording the recording information signal, at the start point of the servo sector 31, the reproducing amplifying means 13 is already in the reproducing state. Since a part or all of the response time 37 has elapsed, the envelope of the reproduction output signal 36 of the servo sector 31 from the reproduction amplification means 13 is stabilized.

As a result, in the data sector between the data sector 32 and the next servo sector 31,
Since the invalid data sector 38, which is a void area where signals cannot be recorded or reproduced, can be reduced, the data sector 32 in the sector can be relatively increased. That is, the recording density can be effectively increased.

As described above, according to the present embodiment, in the magnetic recording apparatus using the sector servo method, the switching from the stop of the reproduction amplifier from the stop state to the execution state until the envelope of the reproduction output signal is stabilized. The void area due to the response time can be reduced.

[0033]

According to the magnetic recording apparatus of the present invention, the control means controls the reproducing / amplifying means separately from the control for the recording / amplifying means in consideration of the time until the signal output from the reproducing / amplifying means is stabilized. This eliminates the need for a gap area until the reproduction signal is stabilized. As a result, the gap area due to the switching response time from when the reproduction amplifier enters the execution state to when the envelope of the reproduction output signal is stabilized can be reduced, and the range of invalid data sectors can be reduced. This makes it possible to increase the size of the data sector in each sector, and to provide an unprecedented excellent magnetic recording apparatus capable of increasing the recording density on the magnetic recording surface.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a magnetic recording device of the present invention.

FIG. 2 shows a magnetic recording apparatus and a magnetic recording method according to the present invention;
FIG. 3 is a waveform diagram illustrating an operation of the embodiment and a schematic diagram illustrating a configuration of a sector.

FIG. 3 shows a conventional magnetic recording apparatus and magnetic recording method;
FIG. 3 is a waveform diagram illustrating an operation and a schematic diagram illustrating a configuration of a sector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic recording surface 12 Recording amplification means 13 Reproduction amplification means 14 Control means 15 Processing means 21 Servo sector 22 Data sector 23 R / W gate 24 Recording state 25 Reproduction state 26 Reproduction output signal 27 Switching response time 28 Invalid data Sector 31 Servo sector 32 Data sector 34 Write gate 35 Read gate 36 Reproduction output signal 37 Switching response time 38 Invalid data sector

Claims (2)

(57) [Claims] A servo section in which a positioning signal is recorded.
Data sector and a data sector on which a recording information signal is recorded.
Magnetic disk, and the magnetic disk
While reproducing the positioning signal and the recorded information signal,
The recording information signal output from the host device is
From the magnetic head for recording on the servo
The magnetic head is positioned according to the reproduced positioning signal.
Control means for controlling the recording and reproducing by the magnetic head.
Reproducing amplifying means for amplifying the determined positioning signal;
Recording information recorded in the data sector by the head
Magnetic recording apparatus having a recording amplification means for amplifying a report signal
In the above, when the control means transitions from a recording state of a recording information signal by the magnetic head to a reproducing state,
2. The magnetic recording apparatus according to claim 1, further comprising a first control function for performing control to execute reproduction by the reproduction amplification means before stopping the recording amplification means on a sector. 2. A servo section in which a positioning signal is recorded.
Data sector and a data sector on which a recording information signal is recorded.
Magnetic disk, and the magnetic disk
While reproducing the positioning signal and the recorded information signal,
The recording information signal output from the host device is
From the magnetic head for recording on the servo
The magnetic head is positioned according to the reproduced positioning signal.
Control means for controlling the recording and reproducing by the magnetic head.
Reproducing amplifying means for amplifying the determined positioning signal;
Recording information recorded in the data sector by the head
Magnetic recording apparatus having a recording amplification means for amplifying a report signal
, Wherein the control means further includes a processing means for outputting a gate signal corresponding to an interval between servo sectors on the magnetic disk, and wherein the control means performs the reproduction based on the gate signal output from the processing means. A magnetic recording apparatus comprising a second control function for controlling operations of an amplification unit and a recording amplification unit.