JPH09251727A - Disk recording/reproducing device and its recording/ reproducing/controlling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to evade recording/reproducing processing of the data on an occurrent position of a thermal asperity(TA) phenomenon in a disk recording/ reproducing device such as an HDD(hard disk device) using an MR(magneto-resistive) head. SOLUTION: This disk recording/reproducing device is provided with a TA detection part 11 detecting the occurrence of the TA phenomenon based on a regenerative signal outputted from the MR head 1A, a TA position storage part 13 recorded with TA positional information for showing a recording/reproducing position that the TA phenomenon occurs permanently, a decision part 22 deciding whether or not the occurrence of the TA phenomenon is permanent and data reproducing control means 20, 24 eliminating the regenerative signal from the position where the occurrence of the TA phenomenon is decided to be permanent from data reproducing processing. The decision part 22 compares the positional information showing the position of the MR head 1A with the TA position information stored in the TA position storage part 13 when the TA phenomenon is detected, and decides that the occurrence of the TA phenomenon is permanent when the mutually equal TA positional information exist.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus which is particularly applied to a hard disk device or the like and uses an MR head as a reproducing head.

[0002]

2. Description of the Related Art Conventionally, a disk recording / reproducing apparatus such as a hard disk device (HDD) magnetically records data on a disk, which is a recording medium, by using a magnetic head (hereinafter simply referred to as a head), and records data from the disk. To play. The head generates a recording magnetic field through the gap during the data recording operation, and detects the recording magnetic field from the disk during the data reproducing operation and converts it into a reproduction signal.

Incidentally, in the HDD, as a technique for realizing a high recording density, a structure in which an MR (Magnetic Resistive) head using a magnetoresistive element as a reproducing head and an inductive thin film head used as a recording head are integrated with each other. The recording / playback separation type head has been developed. The recording / reproducing separation type head can optimize the recording gap of the recording head and the reproducing gap including the magnetoresistive element (MR element), thereby realizing both the improvement of the recording characteristics and the improvement of the reproducing resolution. Is possible.

The MR head is an element whose resistance value changes in response to a change in magnetic flux (flux change according to a recording magnetic field on the disk). The data reproduction system of the HDD converts a change in resistance of the MR head into a signal voltage of a reproduction signal. In an HDD, a head slider on which an MR head and a recording head are mounted moves while flying above the disk. Specifically, the head slider is flying over the disk at a minute height of, for example, about 50 nm. As a result, the bottom surface of the head slider may collide with a protrusion or the like on the disk. The MR element of the MR head is mounted on the bottom surface of the head slider.

[0005] The resistance of the MR head greatly changes with a sudden rise in temperature due to the collision energy when the MR head collides with the disk surface. When such a state occurs, as shown in FIG. 7, as a reproduction signal from the MR head, a signal waveform in which the signal amplitude (output level) fluctuates rapidly occurs. It is presumed that this signal waveform means a sharp increase in amplitude associated with a rapid temperature rise of the MR element, and an envelope associated with a decrease in temperature due to heat dissipation of the MR element.

A phenomenon in which a rapid change in the resistance value occurs with the temperature rise of the MR head and the reproduced signal waveform fluctuates is a thermal asperity.
rity) phenomenon. When this thermal asperity (TA) phenomenon occurs, as shown in FIG. 7, since the signal amplitude of the reproduction signal changes significantly, not only can data not be accurately demodulated (reproduced) by the time it returns to the normal level, This adversely affects the response of the AGC circuit (circuit for keeping the level of the read signal constant) provided in the data reproducing system. In short, normal data reproduction processing becomes difficult and causes an increase in the reproduction error rate.

As a method for solving such a problem, M
The change in the DC level of the reproduction signal from the R head is detected,
A method has been proposed in which a signal waveform having an opposite phase is added thereto to compensate. When the TA phenomenon occurs, as shown in FIG. 7, a rapid temperature rise causes a change in the signal amplitude that draws the envelope due to heat dissipation. Therefore, for example, a DC level detection circuit that detects the envelope of the reproduced signal is used. Thus, the TA detection circuit can be configured.

[0008]

As described above, the MR
In an HDD using a head, a thermal asperity (TA) phenomenon occurs when the MR head collides with a protrusion or the like on the disc (a protrusion on the disc itself or a minute object attached to the surface). Therefore, the waveform of the reproduction signal from the MR head fluctuates abruptly, which makes it difficult to perform normal data reproduction processing and causes an increase in the reproduction error rate.

In order to solve such a problem, as described above, the T detected in the MR head by the TA detection circuit.
A method has been proposed in which the A phenomenon is detected and the reproduced signal thereof is compensated by, for example, a DC cancel circuit for adding an antiphase signal. However, this compensation method is not always sufficient. If the cause of TA is temporary due to dust or the like adhering to the surface of the disc, TA
Occurrence of TA may be resolved, but TA may be permanent due to protrusions and the like existing on the disk. Therefore, if the recording / reproducing position where the TA occurs on the disc can be specified in advance, it is desirable to avoid the data reproducing process or the recording process for the recording / reproducing position.

A first object of the present invention is, in a disk recording / reproducing apparatus such as an HDD using an MR head, when a thermal asperity (TA) phenomenon occurs, a permanent TA is generated and a temporary TA is generated. It is to realize a reliable data reproduction process that can reduce the reproduction error rate as a result, in distinction from the case of occurrence. A second object of the present invention is to avoid a data recording / reproducing process for a recording / reproducing position on a disc which has a permanent factor of TA generation and always realize a highly reliable data recording / reproducing process.

[0011]

According to a first aspect of the present invention, TA detecting means for detecting the occurrence of a TA phenomenon based on a reproduction signal output from an MR head, and a recording / reproducing position where the TA phenomenon permanently occurs. Indicating the TA position information (TA position information table), TA position storage means, determination means for determining whether or not the occurrence of the TA phenomenon is permanent, and T
A disk recording / reproducing device having a data reproduction control means for excluding a reproduction signal from a position where the occurrence of the A phenomenon is determined to be permanent, from the data reproduction processing. When the TA phenomenon is detected, the judging means compares the position information indicating the position of the MR head with the TA position information stored in the TA position storing means, and when the matching TA position information is present, the TA phenomenon is detected. Is determined to be permanent.

Here, for example, in the case of HDD, when the product is shipped,
In the defect detection process on the disc, it is possible to specify to some extent the position of a protrusion or the like on the disc that causes TA. By using this method, the TA position information for indicating the recording / reproducing position where the TA phenomenon permanently occurs, that is, the position information indicating the position of the protrusion or the like is stored in the HDD.
It is registered in the TA position storage means, which is a memory controlled by the CPU. It is also possible to perform the same type of work when the disk is initialized, for example.

With this structure, the T prepared in advance is
Based on the A position information, the reproduction position for reproducing the data is T
In the case where the A phenomenon corresponds to a position at which it permanently occurs, the data reproduction process excludes the reproduction signal from that position, whereby the unstable data reproduction process can be prevented.

A second aspect of the present invention is that when data recording operation is performed, M
The position information generating means for generating the position information indicating the position of the recording head based on the position information reproduced by the R head is compared with the position information indicating the position of the recording head and the TA position information, and the matched TA position information is obtained. Is a device having a determination means for determining whether or not the data exists and a data recording control means for prohibiting the data recording process at the corresponding position. The data recording control unit prohibits the data recording process when the position where the recording head should record the data by the determination unit corresponds to the position where the TA phenomenon is permanently generated based on the TA position information. For example, an alternative position is set.

With such a structure, the T prepared in advance is
Based on the A position information, the position where the TA phenomenon permanently occurs is excluded from the recording position, and the data recording is not executed. Therefore, during the data reproducing operation, it is possible to prevent the process of reproducing the data from the position where the TA phenomenon permanently occurs, and as a result, it is possible to reduce the reproduction error rate.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an HDD related to the present embodiment.
2 is a functional block diagram relating to the data reproduction control process of the present embodiment, and FIG. 5 is a functional block diagram relating to the data recording control process of the present embodiment. (Structure of HDD) In this embodiment, as shown in FIG. 1, an MR head 1A is used as a reproducing head, and a recording head 1 is used.
As B, it is assumed that the HDD adopts the recording / reproducing separated type head 1 using the induction type thin film head. The head 1 (actually, the head slider) is supported by the head actuator 2 and is configured to move in the radial direction of the disk 4 by the driving force of the voice coil motor (VCM) 3. The VCM 3 has the head 1 as described later.
It is driven by the VCM driver 6 controlled by the CPU 10 which performs the positioning control process of.

The disk 4 is a data recording medium, and
One or more sheets are attached to the spindle motor 5 and rotate at high speed. Here, the head 1 moves or performs a recording / reproducing operation in a state of being floated over the disk 4 with a minute distance. As described above, the flying height of the head 1 is temporarily reduced, or minute objects such as protrusions and dust attached to the disk 4 cause the MR head 1A to move.
When the two come into contact with or collide with each other, a thermal asperity (TA) phenomenon occurs due to a rapid temperature rise.

The data reproducing system comprises a head amplifier 7, a read channel 8, a disk controller (HDC) 9, and a CPU 10. The head amplifier 7 amplifies the reproduction signal read by the MR head 1A and transfers it to the read channel 8. The read channel 8 is the MR head 1.
A data reproduction processing circuit for performing reproduction processing for reproducing (demodulating) data (including position information which is user data and servo data) from a reproduction signal from A, for example, P
It includes an RML type signal processing circuit. Read channel 8
Transfers the reproduced user data (eg, NRZ encoded data) to the HDC 9.

The HDC 9 has an interface between the HDD and the host computer and a function of data control (a disk controller in a narrow sense), and performs recording / reproduction data transfer control, command processing (address processing), reproduction data error check processing and the like. Performs various control processes.

The CPU 10 is a main controller of the HDD, and executes a data recording / reproducing control process associated with the occurrence of the TA phenomenon related to the present embodiment and a head 1 positioning control process. The servo circuit 12 inputs the servo data reproduced by the read channel 8, generates position information necessary for the positioning control process of the head 1, and outputs the position information to the CPU 10. In the present embodiment, it is assumed that the CPU 10 finally generates the position information of the MR head 1A or the recording head 1B during the data recording / reproducing control process accompanying the occurrence of the TA phenomenon described later.

In this embodiment, the CPU 10 uses the memory 13
Read / write control is executed, and a process of retrieving TA position information from the memory 13 is performed as described later. In the memory 13, TA position information detected in advance during the manufacturing process is recorded. Further, in this embodiment, the TA detection circuit 11 is provided. As described above, the TA detection circuit 11 is a DC level detection circuit or the like that detects a change in the signal amplitude of the reproduction signal (see FIG. 7) that draws an envelope due to heat dissipation from a rapid temperature rise due to the occurrence of the TA phenomenon. It consists of (Data Reproduction Control Processing Accompanying Occurrence of TA Phenomenon) The control processing during data reproduction of the present embodiment will be described below with reference to FIGS. 2, 3, and 4. FIG. 2 is a functional block diagram related to this control processing, and the position information generation unit 2
1, the new TA determination unit 22 and the temporary TA determination unit 23 are shown in FIG.
Is a function executed by the CPU 10. The reproduction signal switching unit 20, the signal removing unit 24, and the TA compensating unit 25 are functions included in the read channel 8 and HDC 9. Hereinafter, description will be made assuming that these functional units execute.

When a read command is issued from the HDC 9, the CPU 10 controls the movement of the head 1 based on the position information from the servo circuit 12 to position the MR head 1A at a target position (a track including a sector to be accessed). Control (steps S1 and S2).

The MR head 1A reads the recording data from the positioned target position and outputs a reproduction signal (step S3). In reality, the reproduction signal is amplified by the head amplifier 7. In the present embodiment, the TA detection circuit 11 is
The reproduction signal from the head amplifier 7 is monitored to detect the occurrence of the TA phenomenon. When the TA phenomenon does not occur, the reproduction signal is sent to the read channel 8 and the reproduction process is executed (NO in step S4, S12).

When the TA detection circuit 11 detects the occurrence of the TA phenomenon, the new TA determination unit 22 shown in FIG.
It is determined whether the occurrence of the phenomenon is new or permanent (YES in step S4, S5). That is,
The new TA determination unit 22 compares the position information indicating the current position of the MR head from the position information generation unit 21 with the TA position information table recorded in the TA position information storage unit (memory 13), and creates a TA position information table. It is determined whether the corresponding TA position information exists.

Here, the TA position information storage unit 13 stores H
During the DD manufacturing process, the positions where the protrusions on the disc that permanently cause the TA phenomenon are present are specified,
It is recorded as position information indicating the position. Normally, in the HDD manufacturing process, as a defect processing process, there is a process of specifying a sector including a defect (protrusion or the like) fixedly present on the disk as a defective sector. Using such processing, TA position information is generated and T
It is registered in the A position information storage unit 13.

When the TA position information corresponding to the TA position information storage unit 13 is present, the new TA determination unit 22 determines M.
The position of the R head 1A is determined as the position where the TA phenomenon occurs permanently, and the signal P indicating that is output (YES in step S6). The reproduction signal switching unit 20 uses the new TA
In response to the signal P from the determination unit 22, the reproduction signal is switched to the signal removal unit 24 to be excluded from the reproduction processing of the read channel 8 (step S7). In other words, in the data reproduction process, the reproduction signal from the reproduction position determined as the position where the TA phenomenon occurs permanently is skipped and is not reproduced as data.

On the other hand, the new TA determination unit 22 determines the corresponding T
It is determined that the A position information does not exist and a new TA phenomenon has occurred, and the signal TA is notified to the temporary TA determination unit 23 (NO in step S6). The temporary TA determination unit 23
It is determined whether it is a temporary TA phenomenon or a new permanent TA phenomenon.

Specifically, the read operation by the MR head 1A is repeated a predetermined number of times (N times) (read retry processing), and TA detection by the TA detection unit 11 is also repeatedly executed (step S8). In this process, if the occurrence of TA phenomenon disappears at the same position, a temporary TA
The determination unit 23 determines that a temporary TA phenomenon has occurred,
The reproduced signal switching unit 20 is controlled so as to send the disappeared n-th (n ≦ N) reproduced signal as a normal signal to the read channel 8 (steps S11 and S12). It is assumed that the temporary TA phenomenon occurs when, for example, dust or the like adheres to the disk 45 and the dust or the like is removed by the read retry process.

If the occurrence of the TA phenomenon does not disappear at the same position even after the predetermined N times of repeated processing, the temporary TA determination unit 23 determines that the newly generated permanent T has occurred, as shown in FIG.
It is determined to be the A phenomenon (step S13). In response to this determination, the temporary TA determination unit 23 causes the reproduction signal switching unit 20 to
Is controlled to cause the TA compensating unit 25 to execute a predetermined compensation process (for example, the above-described anti-phase signal addition process) on the Nth reproduced signal, and then sends the signal to the read channel 8 (steps S14 and S15). . Furthermore, the temporary TA determination unit 23
Records the position information of the MR head 1A corresponding to the position where the new TA phenomenon has occurred in the TA position information storage unit 13 as new TA position information (step S16).

As described above, when the TA phenomenon occurs during the data reproducing operation by the MR head 1A, if it is a previously specified permanent TA generation position, the reproduction signal read from the position is reproduced. Exclude from processing. Therefore, by excluding the reproduction signal that abnormally fluctuates due to the occurrence of the TA phenomenon from the data reproduction processing, it is possible to prevent the occurrence of a reproduction error due to the occurrence of the TA phenomenon.
Further, when a temporary TA phenomenon occurs due to factors such as dust adhering to the disc, the reproduction signal when the TA phenomenon disappears is used for the data reproduction processing, so that the reliable data reproduction processing is performed. There is also an effect that it can be realized and the cause of the temporary TA phenomenon can be removed. Furthermore, in the case of the occurrence of a new permanent TA phenomenon, the MR head 1 at that time
The position information of a is recorded in the TA position information storage unit 13 as new TA position information. When the recording operation is performed again at the same position next time, the new TA position information recorded in the TA position information storage unit 13 is changed to permanent TA position information. This makes it possible to prevent the next recording operation for that position. (Data Recording Control Processing Accompanying Occurrence of TA Phenomenon) Next, with reference to FIG. 5 and FIG. 6, the control processing at the time of data recording of the present embodiment will be described. FIG. 5 is a functional block diagram related to this control processing, and includes a position information generation unit 30, a determination unit 31, and a recording control unit 32 of the recording head 1B. The position information generation unit 30 and the determination unit 31 include the CPU 10
Is a function to be executed by. The recording controller 32 is a function included in the read channel 8 and HDC 9. Hereinafter, similar to the above, it is assumed that these functional units execute.

When the HDC 9 issues a write command, the CPU 10 controls the movement of the head 1 based on the position information from the servo circuit 12 to position the recording head 1B at the target position (steps S20, S21). Here, the position information of the recording head 1B is generated based on the servo data reproduced from the disk 4 by the MR head 1A. At this time, if new TA position information exists, the TA position information is changed to permanent TA position information.

The judging section 31 judges whether or not the position on the disk recorded by the recording head 1B corresponds to the position where the permanent TA phenomenon occurs (step S22). That is, the determination unit 31 includes the position information generation unit 3 of the recording head 1B.
Position information indicating the current position of the recording head 1B from 0 and TA
The TA position information table recorded in the position information storage unit 13 is compared to determine whether or not there is TA position information corresponding to the TA position information table.

When the TA position information corresponding to the TA position information storage unit 13 is present, the judging unit 31 judges that the position on the disk to be recorded is the position where the TA phenomenon occurs permanently (step S23). Yes). Judgment unit 31
Prohibits the recording control 32 from recording data at that position.

Further, the determination section 31 sets a substitute position of the position determined as the position where the TA phenomenon occurs permanently, and executes the processing of recording the requested data at the substitute position (steps S24 to S26). ). That is, the recording head 1B is moved to the alternative position, and the recording control 32 controls the recording signal WS to be supplied to the recording head 1B. As a result, the recording head 1B records the requested data at the alternative position changed from the position determined as the position where the TA phenomenon occurs permanently.

As described above, during the data recording operation by the recording head 1B, the position on the disk to be recorded is
In the case of the permanent TA phenomenon occurrence position previously recorded in the TA position information storage unit 13, the recording operation is prohibited. Therefore, data is recorded at the position where the permanent TA phenomenon occurs,
It is possible to prevent a situation in which the data reproduction process becomes impossible or difficult when the data is reproduced thereafter. In the TA position information storage unit 13, as described above, together with the TA position information specified at the time of manufacturing the HDD,
Since TA position information indicating the position where a new TA phenomenon is newly discovered during the data reproducing operation is also recorded, this is changed to permanent TA position information for use.

Further, since the data recording is prohibited at the position where the permanent TA phenomenon occurs and the data is recorded by setting the alternative position, the requested recording data can be surely saved. The substitution process by setting the substitution position is the same as the defect function provided in a normal HDD. That is, this is a function of setting a replacement sector of the defective sector when the defective sector exists.

[0037]

As described in detail above, according to the present invention, firstly, when a TA phenomenon occurs during a data reproducing operation,
When it is determined that a permanent TA phenomenon has occurred, the reproduction signal corresponding to that position is excluded from the reproduction processing to prevent unstable data reproduction processing and to ensure reliable data reproduction processing. To be realized. In addition, by registering the occurrence position of the newly discovered permanent TA phenomenon, it is possible to prevent unstable data reproduction processing due to a reproduction signal that is always accompanied by the occurrence of the permanent TA phenomenon. Therefore, as a result, it is possible to greatly reduce the reproduction error rate associated with the occurrence of the TA phenomenon. Secondly, during the data recording operation, the recording process of the data at the position corresponding to the position where the permanent TA phenomenon occurs is prohibited. In other words, it is possible to avoid the data recording / reproducing process for the recording / reproducing position on the disc having a permanent TA phenomenon occurrence factor. Therefore, as a result, it becomes possible to prevent the recorded data from being unreproducible and to reliably protect and store the recorded data.

[Brief description of drawings]

FIG. 1 is an exemplary block diagram showing a main part of an HDD according to an embodiment of the present invention.

FIG. 2 is a functional block diagram for explaining a data reproduction control process of the present embodiment.

FIG. 3 is a flowchart for explaining a data reproduction control process of this embodiment.

FIG. 4 is a flowchart for explaining a data reproduction control process of this embodiment.

FIG. 5 is a functional block diagram for explaining a data recording control process of the present embodiment.

FIG. 6 is a flowchart for explaining a data recording control process of this embodiment.

FIG. 7 is a signal waveform diagram for explaining a thermal asperity phenomenon of the MR head.

[Explanation of symbols]

 1 ... Head 1A ... MR head (playback head) 1B ... Recording head 2 ... Head actuator 3 ... Voice coil motor (VCM) 4 ... Disk 5 ... Spindle motor 6 ... VCM driver 7 ... Head amplifier 8 ... Read channel (data playback processing) Circuit 9) Disk controller (HDC) 10 ... CPU 11 ... Thermal asperity (TH) detection circuit 12 ... Servo circuit 13 ... Memory 20 ... Reproduction signal switching unit 21 ... Position information generation unit 22 ... New TA determination unit 23 ... Temporary TA Judgment unit 24 ... Signal removal unit 25 ... TA compensation unit 30 ... Recording head position information generation unit 31 ... Judgment unit 32 ... Recording control unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 5/39 G11B 5/39

Claims (8)

[Claims] 1. A disk recording / reproducing apparatus for reproducing data recorded on a disk by an MR head using a magnetoresistive element, wherein a thermal asperity phenomenon is generated based on a reproduction signal output from the MR head. TA detecting means for detecting TA position information, TA position storing means for recording TA position information for indicating a recording / reproducing position where the thermal asperity phenomenon permanently occurs in the recording / reproducing area on the disc, When the detection means detects the occurrence of the thermal asperity phenomenon, a predetermined control process for avoiding the influence of the thermal asperity phenomenon on the data recording / reproducing process of the recording / reproducing position corresponding to the TA position information is performed. A disc recording / reproducing apparatus comprising: a control unit for executing the control. 2. A disk recording / reproducing apparatus for reproducing data recorded on a disk by an MR head using a magnetoresistive element, wherein a thermal asperity phenomenon is generated based on a reproduction signal output from the MR head. TA detecting means for detecting TA position information, TA position storing means for recording TA position information for indicating a recording / reproducing position where the thermal asperity phenomenon permanently occurs in the recording / reproducing area on the disc, When the detection unit detects the occurrence of the thermal asperity phenomenon, the position information indicating the position of the MR head is compared with the TA position information stored in the TA position storage unit, and the matched TA position information is detected. Determination means for determining that the occurrence of the thermal asperity phenomenon is permanent when present, and the determination means If the position of the MR head by the constant is the thermal asperity phenomenon occurs permanently,
A disk recording / reproducing apparatus comprising: a data reproducing control means for excluding a reproduced signal read by the MR head from the corresponding position from a data reproducing process. 3. The TA determining means determines that the thermal asperity phenomenon has occurred temporarily when the TA position information corresponding to the position information indicating the position of the MR head does not exist. When the occurrence of the thermal asperity phenomenon disappears by repeatedly performing the detection operation of No. 3 above, the data reproduction processing for the reproduction signal output from the MR head is executed at the number of times, and the detection operation is performed. If the occurrence of the thermal asperity phenomenon does not disappear even after being repeatedly executed a predetermined number of times, it is determined that the thermal asperity phenomenon has newly occurred, and position information indicating the position of the corresponding MR head, The new TA position information is recorded in the TA position storage means separately from the TA position information. Disk recording and reproducing apparatus according to claim 2, wherein the door. 4. The data recorded on the disk is reproduced by an MR head using a magnetoresistive element, and the data is recorded on the disk by a recording head whose position is controlled based on the position information reproduced by the MR head. A disc recording / reproducing apparatus for recording, comprising TA position storage means for recording TA position information for indicating a recording / reproducing position where the thermal asperity phenomenon permanently occurs in a recording / reproducing area on the disc, Position information generation means for generating position information indicating the position of the recording head based on the position information reproduced by the MR head during data recording operation, position information indicating the position of the recording head, and TA position storage means. If the new TA position information is compared with the new TA position information stored in the. The means for changing the new TA position information into permanent TA position information, the position information indicating the position of the recording head and the TA position information stored in the TA position storage means are compared, and the matched TA position is obtained. Judgment means for judging whether or not information exists, and when the judgment means judges that the position of the recording head is a position where the thermal asperity phenomenon occurs permanently, data for the corresponding position And a data recording control means for prohibiting the recording process of the disk recording / reproducing apparatus. 5. The data recording control means, when the determining means determines that the thermal asperity phenomenon is at a position where it permanently occurs, sets an alternative position of the corresponding recording position, The disk recording / reproducing apparatus according to claim 4, wherein the recording / reproducing apparatus is configured to execute a data recording process by a recording head. 6. A TA detecting means for detecting the occurrence of a thermal asperity phenomenon based on a reproduction signal output from the MR head, comprising an MR head for reproducing data recorded on the disk, and TA on the disk. A reproducing control method for a disk recording / reproducing apparatus having TA position storage means for recording TA position information for indicating a recording / reproducing position where the thermal asperity phenomenon permanently occurs in a recording / reproducing area, the data reproducing operation Sometimes, the TA detection means causes the MR
Detecting the occurrence of the thermal asperity phenomenon based on the reproduction signal output from the head; and, when the occurrence of the thermal asperity phenomenon is detected, position information indicating the position of the MR head and the TA position storage means are stored. The stored TA position information is compared, and when the coincident TA position information exists, it is determined that the occurrence of the thermal asperity phenomenon is permanent, and when the TA position information does not exist, the occurrence of the thermal asperity phenomenon occurs. Is determined to be temporary, and when the thermal asperity phenomenon is permanent according to the determination result, the reproduction signal read by the MR head from the corresponding position is excluded from the data reproduction processing, and the determination is performed. When the occurrence of the thermal asperity phenomenon is temporary depending on the result Reproduction control method characterized by comprising the step of performing a normal data reproduction processing after a predetermined processing. 7. If the occurrence of the thermal asperity phenomenon is temporary according to the determination result, the step of detecting the occurrence of the thermal asperity phenomenon during the data reproducing operation is repeated to eliminate the occurrence of the thermal asperity phenomenon. Then, the data reproducing process for the reproduction signal output from the MR head is executed at the number of times, and if the occurrence of the thermal asperity phenomenon does not disappear, it is determined that the thermal asperity phenomenon has newly occurred. 7. The reproduction control method according to claim 6, further comprising the step of recording position information indicating the position of the corresponding MR head as new TA position information in the TA position storage means. 8. A TA position for indicating a recording / reproducing position where the thermal asperity phenomenon permanently occurs in a recording / reproducing area on the disc, which has an MR head for reproducing data recorded on the disc. TA that recorded the information
A recording control method for a disk recording / reproducing apparatus, comprising a position storage means, which records data on the disk by a recording head whose position is controlled based on position information reproduced by the MR head. Generating position information indicating the position of the recording head based on the position information reproduced by the MR head; position information indicating the position of the recording head and a new TA position stored in the TA position storage means. Comparing information, and changing the new TA position information to permanent TA position information when the new TA position information with a matching comparison result is present; position information indicating the position of the recording head; and The step of comparing the TA position information stored in the TA position storage means with each other to determine whether or not the matched TA position information exists. When the position of the recording head is judged to be a position where the thermal asperity phenomenon occurs permanently by the judgment means, the recording process of data to the corresponding position is prohibited, and the corresponding recording position And a step of executing a data recording process by the recording head at the alternative position.