JP2001067605A - Magnetic recording/reproducing device, magnetic recording method and read/write channel circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently record the data by successively incorporating a data signal containing preamble, sink, ECC to be recorded as a sector into one sector succeedingly to the signal for erasing a medium and recording them on the medium. SOLUTION: A mask circuit 3 masks the write data 2 for a fixed period, and changes a recording signal for the period to an erase signal. The fixed period is set by the signal from a comparator 6, and the comparator 6 instructs the mask circuit 3 to release (enable) the mask according to the result comparing an output of a counter 5 with a value stored in a register 7. The write data 2 are masked only for the fixed period from a rise of a write gate by the mask circuit 3, and thereafter, become a normal signal. The length of the masking period is expected to be double of rotary fluctuation unevenness (amplitude value) of the medium, and is set considering linear velocities in respective zones.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, a magnetic recording method, and a read / write channel circuit for recording data on a medium by dividing the data into sectors. The present invention relates to a magnetic recording / reproducing apparatus having a recording format suitable for recording, a magnetic recording method, and a read / write channel circuit thereof.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus for recording data in sectors on a medium, the relationship of recording positions between sectors on the medium is as shown in FIG. In the figure, sectors 81, 82, and 83 show a part of information recorded in a further continuous place other than these.

Here, most usually, the sector 81 is a2
The position is recorded at the position b2 from the position, and similarly, the sector 82 is c
From the position 2 to the position d2, the sector 83 is moved from the position e2 to the position f2.
Recorded in position. However, a margin corresponding to the worst case is provided at each position in order to anticipate the influence of uneven rotation of the medium, and this is a
These are the position and a3 position, the b1 and b3 positions for the b2 position, the c1 and c3 positions for the c2 position, the d1 and d3 positions for the d2 position, and the e1 and e3 positions for the e2 position. As a result, each sector is recorded without overlapping each other even in the worst case.

[0004] Here, such timing fluctuation is caused by uneven rotation of the medium as described above, which is caused by fluctuations from the average value of the rotational speed generated under the servo control of the spindle motor. For.

In the case of reading a sector recorded as described above, the rising timing of the read gate for setting the read period in the sector needs to satisfy the following condition. That is, it rises at a timing that is within the period in which the pattern of the preamble located first in the sector is written and the length of the preamble pattern recording period from there is equal to or longer than a predetermined length.

This is because if the read gate rises before the period in which the preamble pattern is written, the write splice (write seam) is read at the timing when the preamble pattern is reached, thereby reducing the possibility of a read error. This is because if the reading of the preamble pattern of a predetermined length or more cannot be ensured, there is a possibility that the reference clock for reading may not be generated normally.

Therefore, the relationship between the sector written at the write gate timing and the read gate timing for reading the sector is set as shown in FIG. In the figure, (a) is a write gate,
In this enable period, as shown in FIG.
One sector is recorded. The same figure (c)
Is a read gate, and reading is performed during this enable period.

That is, the read gate shown in FIG. 3C rises with a certain delay with respect to the write gate shown in FIG. Here, the degree of this delay is equivalent to the sum of the margins 91 and 92 shown in FIG. 8B, and the lengths of the margins 91, 92, 93 and 94 have been described with reference to FIG. For example, it corresponds to the length between the position a1 and the position a2. In the margins 91, 92, 93, and 94, exactly the same pattern as the preamble 95 having the minimum preamble pattern length is recorded.

Although not directly related to the description here, the preamble 95 is followed by the sink 96, data 97, and EC.
C98, PML99, and PAD100 are recorded to form one sector.

By setting the timing of the write gate and the read gate and the margin in the sector in this way, even if the rotation of the medium occurs during recording and reading, that is, the recorded position is delayed. If the read timing is delayed or advanced when
The above requirements are always fulfilled.

This will be described with reference to FIGS.

FIG. 10 is a diagram for explaining the timing relationship between a sector and a read gate for reading the sector when the recording timing is delayed. Since the write gate rises with a delay as shown in FIG. 3A, the sector shown in FIG. 3B is also recorded with a delay.

On the other hand, FIG. 3C shows a normal lead gate, which rises relatively ahead by a margin 92. Further, even when the lead gate is advanced as shown in FIG. 3C, the rising timing is barely within the margin 91 and does not cross the write splice. Also, the read gate is shown in FIG.
In the case of a delay as in 3), the original timing relationship is established.

FIG. 11 is a diagram for explaining a timing relationship between a sector and a read gate for reading the sector when the recording timing is advanced. As shown in FIG. 7A, the write gate is advanced and rises, and accordingly, the sector shown in FIG. 7B is also advanced and recorded.

On the other hand, in the case of the normal read gate shown in FIG. 2C, the read gate with advanced timing shown in FIG. 2C, or the read gate with delayed timing shown in FIG. This is a timing that does not straddle the write splice and that secures the minimum preamble 95 ((c3) in FIG. 3 is the minimum).

As described above, in the sector, in addition to the period of the minimum preamble 95 required to normally generate the reference clock at the time of reading, unevenness in the rotation of the medium at the time of recording and reading is also considered. In anticipation, as shown in FIG. 9B, an additional preamble pattern of margins 91, 92, 93 and 94 corresponding to four times the amplitude of the rotation unevenness is required.

[0017]

In a magnetic recording / reproducing apparatus having such a recording format, the above-described shift in recording / reading timing caused by rotation fluctuation of a spindle motor is related to a data rate to be recorded. Rather, it is determined by the rotary servo control specifications. Therefore, when the recording density is increased and the recording data rate is increased as in recent years, the ratio of the margin to the sector provided in anticipation of the rotational fluctuation is relatively high, and the recording efficiency is deteriorated. Invite you.

For example, assuming that the recording and reading timing shift caused by the rotation fluctuation is 300 ns (amplitude value) and the data rate is 200 Mbps, the calculation formula is (300e−
9) × (200e6) × 4 / (8 bits) The additional margin is 30 bytes, which is about 6% when one sector is 512 bytes. The present invention has been made in view of such circumstances, and has a recording format that minimizes a margin provided in anticipation of rotational fluctuation and has a recording format suitable for efficiently recording data on a medium. It is an object to provide an apparatus, a magnetic recording method, and a read / write channel circuit thereof.

[0019]

According to the present invention, there is provided a magnetic recording / reproducing apparatus for recording a signal on a medium by dividing the signal into sectors. , EC
C means for generating a data signal including C, erasing signal generating means for generating a signal for erasing the medium, and the generated erasing signal, the preamble and the sync. Means for recording in the sector in the order of data signals including ECC within one sector in order.

As a result, recording can be performed without a write splice, and data can be efficiently recorded on a medium. Here, it is possible to apply recording processing such that the direction of the signal for erasing is always constant. Further, when erasing a medium when recording servo information, control can be applied such that the direction of the erasing current is constant between sectors.

According to another aspect of the present invention, there is provided a magnetic recording / reproducing apparatus for recording a signal on a medium by dividing the medium into sectors, wherein a means for generating a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector is provided. Erasing signal generating means for generating a signal for erasing the medium; and a signal indicating the period of the sector at the time of recording as a write gate signal, and the generated erase signal based on the timing of the write gate signal. Means for recording on the medium, in the order of a signal for shifting, the signal of the data including the preamble, the sync, and the ECC in one sector, and a signal indicating a period for reading the recorded sector as a read gate signal. The rising timing of the read gate signal with respect to the recorded sector corresponds to the write gate. Means for generating a read gate signal equivalent to the rising timing of the sector to be recorded in the signal, and means for reading the sector from the medium based on the generated read gate signal. This is a magnetic recording / reproducing apparatus.

As a result, data can be efficiently recorded on the medium, and the recorded data can be read out without the influence of the write splice as in the related art.
In this case, a so-called zero-phase restart (ZPR) function can be used when transitioning from the erased period to the preamble pattern at the time of reading. As a result, a normal read operation can be performed in the minimum necessary preamble period. Further, the write gate signal and the read gate signal can be generated under the control of a predetermined controller.

According to another aspect of the present invention, there is provided a magnetic recording / reproducing apparatus for recording a signal on a medium divided into sectors, means for generating a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector. Erasing signal generating means for generating a signal for erasing the medium; and a signal indicating the period of the sector at the time of recording as a write gate signal, and the generated erase signal based on the timing of the write gate signal. Means for recording on the medium in the order of a signal for shifting, the signal of the data including the preamble, the sync, and the ECC, and a write fault signal indicating that the signal to be recorded is smaller than a predetermined frequency. Means for detecting the medium as a signal, and writing the medium during a period for recording a signal for erasing. A write fault mask means for masking the Oruto signals, a magnetic recording and reproducing apparatus characterized in that it comprises a means for generating said write gate signal based on the write fault signal is masked results.

As a result, recording can be performed so that a write splice does not occur, data can be efficiently recorded on a medium, and the original function of a write fault signal can be utilized as in the related art. Here, the original write fault signal can be detected by the head amplifier.

In the present invention, the erase signal generating means may include a means for counting a reference clock signal at the time of recording, a rotational fluctuation expected on the medium, and line recording at each position in the radial direction of the medium. Means for storing the result calculated from the density as a value for setting the erase period; comparing the counted result with the stored value; and determining the signal to be recorded based on the comparison result. And a masking means.

Thus, even in a system in which the linear recording density changes in accordance with each zone (each position in the radial direction of the medium), it is possible to realize a recording format with good recording efficiency on the medium.

Further, according to the present invention, the write fault masking means includes means for counting a reference clock signal at the time of recording, rotation fluctuation expected in the medium, and linear recording density at each radial position of the medium. Means for storing the result calculated from the above as a value for setting the period of the write fault mask, and comparing the counted result with the stored value and erasing the medium based on the comparison result. And a means for controlling the signal of the magnetic recording / reproducing apparatus.

Thus, even in the case where the linear recording density changes in accordance with each zone, the original function of the write fault signal can be utilized as in the related art.

According to the present invention, in a magnetic recording method for recording a signal on a medium by dividing the medium into sectors, the medium is erased together with a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector. A signal for erasing, the generated signal for erasing, the preamble, the sync, and the E.
A magnetic recording method characterized in that the data signal including CC is included in one sector in the order of data and recorded on the medium.

As a result, recording can be performed without causing a write splice, and data can be efficiently recorded on a medium.

According to the present invention, in a magnetic recording method for recording a signal on a medium by dividing the medium, the medium is erased together with a data signal including at least a preamble, a sync and an ECC as a signal to be recorded on the sector. A signal indicating the period of the sector at the time of recording as a write gate signal, the generated signal for erasing based on the timing of the write gate signal, the preamble, the sync, and the EC.
The data signal including C is recorded in the sector in the order of one sector, and the fact that the signal to be recorded is smaller than a predetermined frequency is detected as a write fault signal, and the signal for erasing is recorded. And a step of masking the detected write fault signal during a predetermined period, and generating the write gate signal based on the masked write fault signal.

As a result, recording can be performed without causing a write splice, data can be efficiently recorded on a medium, and the original function of a write fault signal can be utilized as in the related art.

Further, according to the present invention, in a read / write channel circuit of a magnetic recording / reproducing apparatus for recording a signal in a sector on a medium, a signal to be recorded in the sector includes at least a preamble, a sync and an ECC. Means for generating a signal, and erasing the medium.
Erase signal generating means for generating a signal for
Means for outputting the generated signal for erasing, the data signal including the preamble, the sync and the ECC in one sector in order, and outputting to the head amplifier. It is.

As a result, it is possible to generate a recording signal in a recording format in which no write splice occurs and recording efficiency on the medium is high.

Also, in the present invention, the erase signal generating means may include means for counting a reference clock signal at the time of recording, rotational fluctuation expected in the medium, and line recording at each position in the radial direction of the medium. Means for storing a result calculated from the density and a value for setting the erasing period; comparing the counted result with the stored value; erasing the medium based on the comparison result; And a means for controlling generation of a signal for read / write.

Thus, even in the case where the linear recording density changes in accordance with each zone, it is possible to generate a recording signal of a recording format having high recording efficiency on a medium.

[0037]

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

FIG. 1 is a diagram showing the configuration of an embodiment of an R / W (read / write) channel applicable to the magnetic recording / reproducing apparatus of the present invention. As shown in the figure,
The R / W channel 1 has a mask circuit 3, a counter 5, a comparator 6, and a register 7. Note that the R / W channel 1 actually has a configuration other than these,
As a basic function, read / write data is processed in an analog manner (for example, automatic gain control (AGC) or PGC).
LL is used to generate a reference clock, etc.), and FIG. 2 shows characteristic components particularly when applied to the present invention.

The mask circuit 3 masks the write data 2 for a certain period, and converts a recording signal during this period into an erase signal. This fixed period is set by a signal supplied from the comparator 6.

The counter 5 counts the PLL signal 4 at the time of writing and generates a signal whose output increases, for example, with time. This output is used as an input signal on one side of the comparator 6.

The comparator 6 compares the output of the counter 5 with the value stored in the register 7, and masks the mask circuit 3 only when the output value of the counter 5 becomes larger than the value stored in the register 7, for example. Is released (enable).

The register 7 has a CPU (central)
A predetermined value is stored according to an instruction from a processing unit. This value is calculated by comparator 6
Of the other side.

The operation of the R / W channel 1 according to the above configuration will be described with reference to FIG.

The write data 2 is masked by a mask circuit 3 for a certain period. That is, the write data 2 is transmitted by the mask circuit 3 as shown in FIG.
A certain period 31 from the rise of the light gate shown in FIG.
Is masked only after that, and then output as a normal signal.

The comparator 6 compares the output of the counter 5 for counting the output of the write PLL with the value set in the register 7 in order to generate the mask signal for the fixed period 31. That is, the output of the counter 5 monotonically increases with time, for example, while the output of the register 7 is constant, so that the comparison result reverses at a certain timing. Therefore, the length of the mask period can be arbitrarily set by changing the value set in the register as occasion demands.

Here, the length of the mask period is set in consideration of the linear fluctuation density of each zone (the position in the radial direction of the medium) while allowing for twice the rotation fluctuation unevenness (amplitude value) of the medium. Is done. The reason why it is only necessary to expect twice the rotation fluctuation unevenness (amplitude value) of the medium will be described later.
The reason for considering the linear recording density in each zone is to cope with the case where the linear recording density is changed in each zone in order to make the recording wavelength on the medium closer to a constant. The write gate also corresponds to the length of the mask period and the linear recording density.

Next, a recording format recorded by the R / W channel will be described with reference to FIGS. In FIG. 2, (a) shows the write gate, (b) shows the configuration of the sector recorded at this write gate timing, and (c) shows the most usual read gate timing.

That is, the sector is obtained by adding the periods of the erases 21 and 22 ahead of the minimum necessary preamble 95 in anticipation of double the rotation fluctuation (amplitude value) of the medium. The rising timing is most usually the same as the rising timing of the normal write gate. Note that the same components as those shown in the already described figures are denoted by the same reference numerals.

FIG. 4 shows a positional relationship on a medium of a sector having such a recording format and a sector recorded at a position following the sector. That is,
A sector 42 is recorded at a position following the sector 41. The hatched portions of these sectors 41 and 42 are shown in FIG.
This corresponds to the periods of erase 21 and 22 indicated by.

Then, due to rotation fluctuation during recording, sector 4
1 is recorded from the a2 position to the b2 position as the most average position, the most advanced position is recorded from the a1 position to the b1 position, and the most delayed position is recorded from the a3 position to the b3 position. Similarly,
The sector 42 has a position from the position c2 as the most average position.
Recorded from 3 positions.

With respect to the sectors 41 and 42 at the recording positions in such a fluctuating range, the read gate also rises at timings 43 and 44 in FIG. Then, in any case, the read gate rises during the erased period or rises immediately before the end of the erase period (immediately before the start of the preamble period). (Note that the areas outside the sectors 43 and 44 are actually in the same state as the erase.) Therefore, since the reading is not started from the preamble pattern, it is basically not necessary to cross the write splice, and it is also necessary. A minimum preamble period can also be ensured.

However, the direction of the erase current immediately after the start of recording by the write gate must be the same as the direction of the current when the write gate is disabled due to the disable of the write gate. There is. Otherwise, the magnetization reversal occurs at the beginning due to the erase started by the light gate. Also, for the same reason, when erasing when recording servo information, it is necessary to align the direction of the erasing current with the direction of the erasing current.

For this reason, in the case of erasing, this R / W channel 1 is so recorded as to always have the same current direction.
Is passed through the recording head.

As described above, in the magnetic recording / reproducing apparatus of the present invention, as the recording format, an erasing period corresponding to twice the amplitude of the rotation unevenness is simply added as a margin in front of the minimum necessary preamble period. With this small margin, it becomes possible to cope with uneven rotation fluctuation as in the conventional case.

In the method of starting up and reading out the read gate from the erase period, it is necessary to perform the same read operation as usual by using the minimum necessary preamble period. For example, a method called a zero-phase restart (ZPR) method can be applied. Since this technique is widely used in general, detailed description is avoided. However, a specific read signal at the time of transition from an erased period to a signal recorded period is captured, and an AGC or PLL is operated thereafter. It is to let.

Next, the R / W channel 1 described above
An embodiment of a magnetic recording / reproducing apparatus to which the present invention is applied will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the magnetic recording / reproducing apparatus includes an HDA 51 having a medium 52, a head 53, and a head amplifier 54, an R / W channel 1, a GA 56, a spindle motor (SPM) and a voice coil motor (VCM). And a controller 57.

The HDA 51 includes a medium 52 and a head 5
3. The head amplifier 54 is assembled (assembled) integrally, and exchanges write gate, read gate, write data, SPM control signal, VCM control signal, head amplifier control signal, write fault signal, etc. with the outside. Unit.

The medium 52 has a head 53 on which data is recorded and from which the recorded data is read.

The head 53 magnetically records data on the medium 52 and reads out the recorded data to supply it to the head amplifier 54.

The head amplifier 54 amplifies the read data.

The R / W channel 1 processes the read / write data in an analog manner as described above (for example,
The basic function is to generate a reference clock by AGC or PLL.

The GA 56 is a CPU for controlling this device,
ROM (read) for recording the control program
RAM (rand memory), which functions as a temporary storage location for performing calculations necessary for control, and the like.
om access memory), control of data transfer between the host (not shown) and the R / W channel 1,
H that controls the timing of the read gate and write gate
DC (hard disc controller),
It has other control logic and the like. The HDC and the control logic are supplied with a read clock from the R / W channel 1.

The SPM / VCM controller 57 controls the rotation of the spindle motor and the head position by the GA 56.
CPU and control logic.

The operation of this embodiment will be described.

At the time of recording, the write gate from the GA 56, the write data from the R / W channel 1,
The PM / VCM controller 57 supplies a control signal for each motor to the HDA 51. At the time of this recording, as described above, the write data from the R / W channel 1 is a signal in which a predetermined erase period precedes a preamble period. Thus, a predetermined recording is to be performed.

If a recording signal of such a format is to be recorded as it is, a write fault signal 55 is generated. The write fault signal is for notifying that no write data to the head 53 is generated even though the write gate is in the enable state.
In the present invention, since write data is masked for a predetermined period after the rise of the write gate, a write fault signal 55 is generated if no action is taken. When the write fault signal 55 is generated, the write gate is forcibly shifted to the disable state.
A circuit that eliminates the occurrence of 5 is required.

The timing relationship between the write gate, the write data, and the write fault signal 55 will be described with reference to FIG. FIG. 7A shows a write gate, and write data is output as shown in FIG. 7B after a period 31 for erasing. FIG. 9C shows a write fault signal, which rises once in response to the enable transition of the write gate, but falls when it detects that there is no write data.
When the write fault signal falls, the write gate also falls as shown in FIG. As a result, the write operation ends incompletely.

A circuit added to the GA 56 to prevent such incomplete write operation will be described with reference to FIG. FIG. 14 is a diagram showing a configuration of a write fault mask circuit provided at the input section of the GA 56 for the write fault signal 55. As shown, the write fault mask circuit 71 includes a mask circuit 72, a counter 75, and a comparator.
And a register 77.

The mask circuit 72 masks the write fault signal 55 from the head amplifier for a certain period and ignores the write fault signal during this period. This fixed period is set by a signal supplied from the comparator 76.

The counter 75 counts the clock signal 74 and generates a signal whose output, for example, increases with time. This output is used as an input signal on one side of the comparator 76.

The comparator 76 compares the output of the counter 75 with the value stored in the register 77, and
Is instructed to release the mask to the mask circuit 72 (enable) only when the output value of the register becomes larger than the value stored in the register 77, for example.

The register 77 stores a predetermined value according to an instruction from the CPU. This value is input to the other side of the comparator 76.

The operation of the write fault mask circuit 71 according to the above configuration will be described.

The write fault signal 73 is output from the mask circuit 72
Is applied for a certain period of time. That is, the write fault signal 73 is generated by the mask
The signal is masked only for a certain period from the rise of the signal, and thereafter, is output so as to become a normal write fault signal.

The comparator 76 compares the output of the counter 75 for counting clocks with the value set in the register 77 in order to generate the mask signal for the predetermined period.
That is, the output of the counter 75 monotonically increases with time, for example, whereas the output of the register 77 is constant, so that the comparison result is reversed at a certain timing. Therefore, the length of the mask period can be arbitrarily set by changing the value set in the register as occasion demands.

Here, the length of the mask period is set in consideration of the linear fluctuation density in each zone (position in the radial direction of the medium) while allowing for twice the rotation fluctuation unevenness (amplitude value) of the medium. Is done. The reason for expecting twice the fluctuation in the rotation (amplitude value) of the medium is that during this period, the write data is masked and becomes an erase signal. The reason for considering the linear recording density in each zone is that the number of bits (corresponding to) included in the rotation unevenness of the disk (media) differs depending on the radial position.

At the time of reading in the embodiment of the magnetic recording / reproducing apparatus shown in FIG. 5, the read gate is provided from the GA 56, the read data is provided to the R / W channel 1, and the SPM
The motor control signal is supplied or received from the VCM controller 57 to the HDA 51, respectively. At the time of this reading, as described above, the read data to the R / W channel 1 is a signal in which a predetermined erase period precedes a preamble period.

[0078]

As described above in detail, according to the first and sixth aspects of the present invention, a data signal including a preamble, a sync, and an ECC to be recorded as a sector is erased from a medium. Since it is recorded on the medium in the order following the signal and included in one sector, it is possible to perform recording without causing a write splice, and it is possible to efficiently record data on the medium by eliminating the need for an additional preamble pattern.

According to the second aspect of the present invention, a data signal including a preamble, a sync, and an ECC to be recorded as a sector is written at a timing of a write gate signal following a signal for erasing a medium. Based on 1
It is included in the sector and recorded on the medium, and at the time of reading, the read gate signal rise timing for the sector generates a read gate signal equivalent to the write gate signal rise timing for the sector, so data is efficiently recorded on the medium. And recorded EC
Data including C can be read out without the influence of a write splice as in the prior art.

According to the third and seventh aspects of the present invention, a preamble, a sync, and an E are to be recorded as a sector.
Following the signal for erasing the medium, the data signal including the CC is included in one sector in order based on the timing of the write gate signal and is recorded on the medium. The write fault signal indicating that it is small is masked during the period of recording the signal for erasing, and the write gate signal is generated based on the resulting write fault signal, so that the recording can be performed so that a write splice does not occur. Further, data can be efficiently recorded on the medium, and the original function of the write fault signal can be utilized similarly to the related art.

According to the fourth aspect of the present invention, the erase signal generating means includes means for counting a reference clock signal at the time of recording, rotation fluctuation expected in the medium, and each position in the radial direction of the medium. Means for storing the result calculated from the linear recording density at the time as a value for setting the erase period, and comparing the counted result with the stored value and recording based on the comparison result. Since a signal masking means is provided, it is possible to realize a recording format with high recording efficiency on a medium according to each zone.

According to the fifth aspect of the present invention, the write fault masking means includes means for counting a reference clock signal at the time of recording, rotation fluctuation expected in the medium, and each position in the radial direction of the medium. Means for storing the result calculated from the linear recording density as a value for setting the period of the write fault mask; comparing the counted result with the stored value; masking the write fault signal based on the comparison result Therefore, the original function of the write fault signal can be utilized according to each zone as in the related art.

According to the present invention, at least a preamble,
Erasing media for data signals including sync and ECC
Since the signals are sequentially included in one sector and output to the head amplifier following the signal for shifting, it is possible to generate a recording signal in a recording format that does not generate a write splice and has a high recording efficiency on a medium.

According to the ninth aspect of the present invention, the erase signal generating means includes means for counting a reference clock signal at the time of recording, rotation fluctuation expected in the medium, and each position in the radial direction of the medium. Means for storing the result calculated from the linear recording density at the time as a value for setting the erase period, and comparing the counted result with the stored value and recording based on the comparison result. Since a signal masking means is provided, a recording signal of a recording format with high recording efficiency on a medium can be generated even in a method in which the linear recording density changes according to each zone.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of an R / W channel applicable to a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is an explanatory diagram of a recording format, a write gate, and a read gate according to the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a write gate and write data according to the present invention.

FIG. 4 is an explanatory diagram showing write and read timings of a sector according to the present invention.

FIG. 5 is a diagram showing a configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a relationship between a write fault signal, a write gate, and write data.

FIG. 7 is a diagram showing a configuration of a write fault mask circuit applicable to the magnetic recording and reproducing apparatus shown in FIG. 5;

FIG. 8 is an explanatory diagram showing a recording position of each sector in the magnetic recording / reproducing apparatus.

FIG. 9 shows a recording format in a magnetic recording / reproducing apparatus;
FIG. 3 is an explanatory diagram showing a relationship between a write gate and a read gate.

FIG. 10 is an explanatory diagram showing a relationship between a recording state by a delayed write gate and each read gate in the magnetic recording / reproducing apparatus.

FIG. 11 is an explanatory diagram showing a relationship between a recording state by an advanced write gate and each read gate in the magnetic recording and reproducing apparatus.

[Explanation of symbols]

 1 R / W channel 3 Mask circuit 5 Counter 6 Comparator 7 Register 41, 42 Sector 51 HDA 52 Media 53 Head 54 Head amplifier 56 GA 57 SPM / VCM controller 71 Write fault mask signal 72 Mask circuit 75 Counter 76 Comparator 77 registers

Claims (9)

[Claims] 1. A magnetic recording / reproducing apparatus for recording a signal on a medium by dividing the medium into sectors, means for generating a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector; Erasing signal generating means for generating an erasing signal; and the generated erasing signal, the preamble, the sync, and the data signal including ECC included in one sector in this order. And a means for recording on a medium. 2. A magnetic recording / reproducing apparatus for recording a signal on a medium divided into sectors, means for generating a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector; Erasing signal generating means for generating a signal for erasing; and using the signal indicating the period of the sector at the time of recording as a write gate signal to perform the erase based on the timing of the write gate signal. Means for recording in the sector in the order of the data signal including the preamble, the sync, and the ECC in one sector, and a read gate signal using a signal indicating a period for reading the recorded sector as a read gate signal. Rise timing for the recorded sector of the write gate signal corresponds to the write timing of the write gate signal. Magnetic recording and reproducing apparatus characterized by comprising means for generating a timing equivalent to the read gate signal rising against should do the sector, and means for reading said sector from the media on the basis of the generated the read gate signal. 3. A magnetic recording / reproducing apparatus for recording a signal on a medium divided into sectors, means for generating a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector; Erasing signal generating means for generating a signal for erasing; and using the signal indicating the period of the sector at the time of recording as a write gate signal to perform the erase based on the timing of the write gate signal. Means for recording on the medium in the order of the signal of the data including the preamble, sync, and ECC in one sector, and means for detecting that the signal to be recorded is smaller than a predetermined frequency as a write fault signal And the detected write fault signal during a period for recording the signal for erasing. Magnetic recording and reproducing apparatus characterized by having a write fault mask means for masking, and means for generating said write gate signal based on the write fault signal is masked results. 4. An erase signal generating means for counting a reference clock signal at the time of recording, and calculating from a rotational fluctuation expected in the medium and a linear recording density at each radial position of the medium. Means for storing the calculated result as a value for setting the erasing period; a signal for erasing the medium based on the result of comparing the counted result with the stored value; 4. A magnetic recording / reproducing apparatus according to claim 1, further comprising: means for controlling generation of a magnetic field. 5. The write fault masking means: means for counting a reference clock signal at the time of recording; and calculation from rotation fluctuation expected in the medium and linear recording density at each radial position of the medium. Means for storing a result as a value for setting a period of the write fault mask; means for comparing the counted result with the stored value, and controlling generation of the write fault signal based on the comparison result. 4. The magnetic recording / reproducing apparatus according to claim 3, comprising: 6. A magnetic recording method for recording a signal on a medium by dividing the medium into sectors, wherein the signal to be recorded on the sector is erased together with a data signal including at least a preamble, a sync, and an ECC. A magnetic recording method comprising: generating a signal; and recording the generated signal for erasing, the data signal including the preamble, the sync, and the ECC within one sector in the order of recording on the medium. 7. A magnetic recording method for recording a signal on a medium by dividing the medium into sectors, the method comprising: erasing the medium together with a data signal including at least a preamble, a sync, and an ECC as a signal to be recorded on the sector. A signal indicating the period of the sector at the time of recording is used as a write gate signal, and based on the timing of the write gate signal, the generated signal for erasing, the preamble, the sync, and the data including ECC are generated. The signal is recorded in the sector in the order of one sector, and the fact that the signal to be recorded is smaller than a predetermined frequency is detected as a write fault signal, and the detection is performed during the period of recording the signal for erasing. Masking the masked write fault signal, and writing the masked write fault signal. Magnetic recording method characterized by generating said write gate signal based on. 8. A read / write channel circuit of a magnetic recording / reproducing apparatus for recording a signal on a medium divided into sectors, wherein a signal of data including at least a preamble, a sync and an ECC is generated as a signal to be recorded on the sector. Means; erase signal generating means for generating a signal for erasing the medium; and the generated signal for erasing, the data signal including the preamble, the sync, and the ECC in the order of 1 Means for outputting to a head amplifier within a sector. 9. An erase signal generating means for counting a reference clock signal at the time of recording, and calculating from a rotational fluctuation expected in the medium and a linear recording density at each radial position of the medium. Means for storing the calculated result as a value for setting the erasing period; a signal for erasing the medium based on the result of comparing the counted result with the stored value; 9. A read / write channel circuit according to claim 8, further comprising: means for controlling generation of a read / write signal.