JPS63306572A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain high track density without increasing the linear density of a recording medium by inserting a track servo signal into a fixed data part and an area not to be used for data by a varied servo system. CONSTITUTION:At least one - more track servo signals are inserted into a data field other than a data sector area in a data field for recording data, e.g. a gap part formed in a data writing operation switching part by the varied servo system. Since it is unnecessary to arrange a track servo signal dividedly from a data field and the data field and the track servo signal can be mixedly recorded, it is unnecessary to increase the linear density of data.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device, and is particularly suitable for high density and has a simple track servo system [Prior Art] Conventional simple track servo system In the first method, as shown in rU S P Ra 32.075J, a part of the recording track has a single data-masked servo sector, and the boundary of the data field past the servo sector is The configuration is such that the user index is output. With such a structure, the format becomes flexible and compatibility with servo sectorless devices is achieved.

However, this track servo system had the following drawbacks.

Since the track servo signal area is provided on a portion of the track, the data field area becomes short, and it is necessary to improve the linear density.

Furthermore, in order to mask the data in the servo sector, it is necessary to prohibit writing of data in the servo sector area in one circuit configuration, resulting in a complicated circuit configuration.

Since there is only one track servo signal area on the track, deformation components of the recording medium cannot be absorbed.
There is a limit to increasing track density.

Since there is only one track servo signal area on the track, it takes a long time for the converter to be located at the center of the track.

Next, a sector servo method can be considered as a second option of the simple track servo method. In the sector servo method, servo data is inserted into a sector area of a data field, and according to this method, there are as many track servo signals as there are sectors.

In addition, since they are uniformly located on the track circumference, the deformation component of the recording medium can be reduced by the number of sectors. Therefore, compared to the first plan, it is possible to increase the track density and also shorten the time it takes for the transducer to be located at the center of the track.

However, since the track servo signal is provided within the sector,
Naturally, it is necessary to increase the linear density of the recording medium. Furthermore, in the sector servo system, since the data area and the track servo signal are located alternately, the format is fixed, and it is difficult for the user to format the data, resulting in poor operability.

Furthermore, since the track servo signal is inserted alternately with the data area, there is a high possibility that the track servo signal will be erased by mistake, and masking the data will result in a complicated circuit configuration.

Next, as a third method of the simple servo method, a verge servo method can be considered. In the buried servo method, the deep part of the track has a frequency that is sufficiently lower than the fundamental frequency of the data.
Recording is performed on the entire circumference of the track using different frequencies, and data is recorded on the surface layer of the boundary. Therefore, compared to lower-level servoless products, the data linear density is the same and the format is free. Furthermore, the track servo signal is obtained continuously on the track, and even higher track density is possible than in the first and second schemes.

However, the converter output is a mixture of the track servo signal and arbitrary data, so the high frequency components of the servo signal affect the data component, and the recording pattern of arbitrary data affects the servo signal window margin, servo accuracy deteriorates.

[Problem that the invention seeks to solve]

Each of the track servo systems listed in μ has its own advantages and disadvantages, and even if they were adopted in a product, they would not be fully satisfactory.

An object of the present invention is to provide a track servo system that improves the drawbacks of the above-mentioned tracking servo system.

[Means for solving problems]

In order to achieve the above object, in the first aspect of the present invention, in the data field for recording data,
A buried servo method is used to fill in at least one data field other than the data sector area, such as a gap provided at a data write operation switching part.
This can be achieved by inserting track servo signals at more than one point.

As a second option, this can be achieved by inserting a track servo signal based on the buried servo method at at least one location within the sync field that synchronizes with the data in the sector.

Furthermore, as a third option, use the buried servo method.

This can be achieved by inserting a track servo signal at at least one or more locations in the gap between the index data section and the data section within the sector.

[Effect]

According to the first to third plans, unlike the track servo systems according to the first method and the second method shown in the prior art, it is not necessary to arrange the track servo signal separately from the data field, and the data field and track servo signal Since signals can be mixed and recorded, there is no need to increase the linear density of data.

Moreover, according to the first to third plans, the second plan shown in the prior art
compared to the sector servo method.

Since the track servo signal is recorded deep in the recording medium, it is difficult to erase the track servo signal using a data write current.

Data can be formatted.

Further, according to the first to third plans, as in the buried servo method, which is the third method shown in the prior art, in order to prevent arbitrary data and track servo signals from being mixed, data with a fixed data pattern is By inserting a track servo signal into the field or into an area of the data field that is not used for data recording, the influence of the data recording modulation method on the track servo signal and the influence of the high frequency component of the track servo signal on the data component can be reduced. Can be made smaller.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 shows the insertion position of the track servo signal on the data format, Fig. 2 shows the circuit configuration of this embodiment, and Fig. 3 shows the recording state of the data and track servo signal on the recording medium. .

Further, FIG. 4 shows a cross section A-A' in FIG. 3.

Figure 3 shows data 1 on the recording medium and track servo signal 2.
, 3 shows the recording state. Track servo signal 2.
3 has two types of frequencies fx sufficiently lower than the fundamental frequency of data in the deep part of the recording medium.

It is recorded as fl, and the data area of the surface layer is.

Erase the track servo signal by erasing it.
Data 1 and track servo signals 2 and 3 can be recorded independently. Data 1 is track servo signal 2.
It is recorded on the surface layer around the boundary of 3.

Next, the operation in the embodiment will be described from the second aiI.

Data 1 recorded on the recording medium and track servo signal 2
, 3 are converted into minute electrical signals by a converter 4. The minute electrical signal is input to the pre-AMP 5. Puri A
Among the output components of the MP5, the data component passes through a low-pass filter 6 to reduce noise, is input to a peak detection circuit 7, converts the peak value of the input waveform into a pulse train, and sends it to the host system side. .

Also, among the pre-AMP5 outputs, track servo signal 2,
The three components are separated by a filter circuit 8 into fundamental wave components t and fz of the track servo signal 2 and 3 components, and are converted into DC components by sample and hold circuits 9 and 10.

By switching the switch circuits 11 and 12, the A/D converter 1
3, the magnitude of the track servo signal 2 and 3 components fz
, fz is detected, and when fl is small.

The converter 4 is moved to the track servo signal 2 side on the recording medium, and if fl is small, the converter 4 is moved to the track servo signal 3 side on the recording medium by the stepping motor 15,
The ratio between fL and fl is controlled to be constant. This places the conversion Wh4 at the boundary between the track servo signals 2 and 3.

It can be placed in the middle of the track.

FIG. 1 shows the data format and the insertion position of the track servo signal.

The data field is an area from the rising edge of an index to the rising edge of the next index, and a portion thereof is not a write-protected area.

In addition, the data field is provided with GaF2 around 1 for alleviating fluctuations in the rotational speed of the recording medium, and GAP1 for alleviating the time delay of the controller on the host side. Furthermore, the inside thereof is divided into sectors, and GaF2, which is an area for transitioning from a data write operation to a read operation, exists between sectors. Also within the sector,
It is divided into an index data section and a data section, and at the beginning of the index data section there is a sync field for synchronizing with the data clock.

Also between the index data part and the data part.

GaF2 exists for transitioning from a data read operation to a data write operation.

In the above configuration, in the present invention, a in FIG. 1',
To record a data field and a track servo signal in a mixed manner by inserting the track servo signal at the positions b, O, and do s.

There is no need to increase the linear density of data, and since the track servo signal is recorded deep in the recording medium, it is not erased by the data write current, which is different from the first and second methods of the prior art. Similarly, there is no need to create a special data mask area, and the circuit can be simplified.

Further, in the above embodiment, a track servo signal is inserted at one point in each part, but the track servo signal is
A similar effect can be obtained even if it straddles the l and sink field.

Furthermore, in FIG. 1, by inserting track servo signals at positions Q, d, and a, it is possible to insert a tracker servo signal at one location in the rear sector. However,
Effects of the sector servo method, which is the second method in the prior art, can be expected, such as higher track density and shorter time until the transducer is positioned at the center of the track. Furthermore, since the track servo signal is recorded deep, there is no need to provide a track servo signal area in the data field, and there is no need to increase the linear density of the recording medium. Since the track servo signal is not erased, data formatting is possible and the reliability of the track servo signal is improved.

Furthermore, the track servo signal uses a buried servo recording method, but if the insertion position of the track servo signal is provided in the GAP section, the data pattern of the GAP section is fixed at the time of data formatting, so the track servo signal By selecting the recording frequencies fl and f2, the influence of data on the track servo signal can be reduced. Further, the influence of the track servo signal on the data section can be ignored because the track servo signal is present in the GAP section.

Furthermore, when inserting a track servo signal into a sync field, it is common to insert a clock bit into the sync field data in order to align the phase with the VFO. For example, in the case of MFM recording, the bit gap is the minimum. This is the highest frequency used. However, the influence of the track servo signal on the data in the sync field can be reduced by making the frequency of the track servo signal sufficiently low.

Furthermore, since the sync field pattern is fixed, the influence of the data pattern on the track servo signal can be reduced by selecting the frequency of the track servo signal.

〔Effect of the invention〕

According to the present invention, a track servo signal is inserted into a fixed data area and an area that is not used as data using a slope servo method.

High track density is possible without increasing the linear density of the recording medium, and data formatting is possible because the data and track servo signals are independent. Furthermore, interference between data and track servo signals, which is a drawback in the buried servo system, can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a time chart showing track servo signal insertion positions on a data format, FIG. 2 is a circuit configuration diagram, and FIG. 3 is a diagram showing data on a recording medium. FIG. 4 is an enlarged view of the main part showing the recorded state of the track servo signal, and is a sectional view taken along the line AA' in FIG.

Claims (1)

[Claims] 1. Recording a mixture of data and track servo signals;
A rotating recording medium, a converter that detects data on the recording medium and a track servo signal, a converter driving device that moves the converter over the recording medium unit, and a track servo circuit that positions the converter on a predetermined track. A recording/reproducing device comprising: a track servo signal inserted by a buried servo method into at least one or more data field areas other than data sector areas within a data field for recording data. 2. A recording/reproducing apparatus according to claim 1, characterized in that a track servo signal based on a buried servo system is inserted at at least one or more locations within a sync field that synchronizes with data in a sector. 3. A recording/reproducing apparatus according to claim 1, characterized in that a track servo signal in a buried servo system is inserted into at least one gap between an index data section and a data section within a sector.