JP2006120279A - Magnetic recording/reproducing device and data recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To widen the operation environment range of a magnetic recording/reproducing device so as to incorporate or mount a compact magnetic recording/reproducing device to a personal digital such as a portable telephone or a portable terminal. <P>SOLUTION: The magnetic recording/reproducing device is provided with a magnetic recording medium, a magnetic head for recording and reproducing information to/from the magnetic recording medium, a spindle motor for rotating the magnetic recording medium, an electronic circuit for recording and reproducing data and controlling the device, and a circuit for detecting a temperature in the device. Preceding deletion during data recording is controlled according to the detected temperature. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a small magnetic recording / reproducing apparatus and a data recording method incorporated in or mounted on a portable information device such as a cellular phone or a portable terminal.

  In recent years, the progress of portable information devices has been remarkable. Especially in mobile phone devices, functions of handling large amounts of characters and image data, e-mail functions, browser functions, etc. have been added as well as higher functionality as telephones. Has been. Thus, mobile phone devices are required not only to function as telephones but also to function as a kind of portable computer. For this reason, it is becoming necessary to provide a large-capacity memory system for storing data, programs and the like of each function in the mobile phone device. In order to incorporate a magnetic recording / reproducing device in a portable information device typified by a cellular phone device, it is required to expand the use environment (especially operating temperature) wider than before. Until now, the environmental temperature of HDDs has been 5 to 55 degrees Celsius for built-in PCs, but considering the mounting of mobile devices such as mobile phones, it is in a very strict temperature range of about -20 to 70 degrees Celsius. The operation must be guaranteed.

  In general, the coercive force of a magnetic recording medium increases in a low temperature environment. This makes it difficult to record data. If the quality of data recording decreases, the error rate increases and the total performance of the apparatus may deteriorate.

  For this reason, in the conventional magnetic recording / reproducing apparatus, as a technique for guaranteeing the recording operation in a low temperature environment, the temperature in the magnetic recording apparatus is detected, and the recording method of the magnetic signal data in accordance with the detected temperature is a general direct overwrite method. There is one that has a function of switching to an erase and write system in which a signal is recorded after being erased once. At the time of recording a new magnetic signal, it is determined whether or not the environmental condition information stored in the memory is satisfied, and the recording method is controlled (see, for example, Patent Document 1).

In addition to the above-described method, the first magnetic disk medium that is easy to write or record information when the ambient temperature of the magnetic disk device is low, and the retention of information when the ambient temperature of the magnetic disk device is high Has a second magnetic disk medium that is easy to record, and records on the first medium when the ambient temperature is low, and records on the second medium when the ambient temperature is high (For example, refer to Patent Document 2).
JP 2002-237005 A JP 2003-346304 A

  When considering incorporating or connecting a small magnetic recording / reproducing device to a so-called portable information device such as a mobile phone or a portable terminal, the operating environment in which the magnetic recording / reproducing device is used becomes wider and more severe than before. come. For this reason, in the conventional configuration (for example, Patent Document 1), the temperature in the magnetic recording apparatus is estimated as a means for preventing the data recording quality from deteriorating at a low temperature due to the temperature change of the recording medium. Accordingly, the magnetic signal recording method is switched from the general direct overwrite method to the erase-and-write method in which the signal is recorded and then the data recording quality is improved.

  However, the conventional technology attempts to improve the quality of the recording signal only by switching to the direct overwrite method or the erase and write method according to the environmental condition information. The erase performance varies greatly depending on the magnetic characteristics such as coercive force and remanence, and the various recording quality parameters (states) such as head recording capability and head flying height. For this reason, even if data is simply recorded by the erase and write method, there is a possibility that good recording quality may not be obtained. Since good data cannot be obtained, there is a risk that the error rate deteriorates in a low temperature environment, which may cause a reduction in the total device performance.

  On the other hand, in the conventional configuration (for example, Patent Document 2), the first magnetic disk medium in which information can be easily written or recorded when the ambient temperature of the magnetic disk apparatus is low, and the magnetic disk apparatus A second magnetic disk medium that can easily hold information when the ambient temperature is high is provided, and recording is performed on the first medium when the ambient temperature is low, while the second medium is recorded when the ambient temperature is high. To record. In this configuration, it is necessary to prepare magnetic disk media having different magnetic characteristics. Therefore, it is impossible to construct a magnetic disk device having only one magnetic disk medium. In addition, the first magnetic disk medium, which is easy to record, is a disk medium that only stores temporary data from the viewpoint of thermal fluctuation, and there are problems in terms of total device cost and device size reduction. Had.

  As described above, the conventional technology has a problem that it is difficult to realize the operation guarantee in the low temperature environment, particularly in the use environment required for the magnetic recording / reproducing apparatus mounted or built in the portable information device or the like. Was.

  The present invention solves the above-described conventional problems, and ensures a predetermined recording performance and prevents quality deterioration of recorded data even when the operating environment of the magnetic recording / reproducing apparatus changes to a low temperature environment. It is an object of the present invention to provide a small magnetic recording / reproducing apparatus and a data recording method that are finally built in or connected to a portable information device.

  In order to solve the conventional problems, a magnetic recording / reproducing apparatus and a data recording method according to the present invention include a magnetic recording medium, a magnetic head for recording / reproducing information with respect to the magnetic recording medium, and rotating the magnetic recording medium. A magnetic recording / reproducing apparatus having a spindle motor to be operated and an electronic circuit for recording / reproducing data and controlling the apparatus includes a circuit for detecting the temperature in the apparatus, and records data according to the detected temperature It is provided with controlling the preceding erasure.

  With this configuration, the optimum data recording operation can be controlled in accordance with the temperature inside the apparatus or the temperature of the magnetic recording medium detected by the detection circuit.

  In the preceding erasure, at least one parameter of the number of preceding erasures, the erase current, and the erase pattern is controlled by the detected temperature.

  With this configuration, it is possible to finely control the preceding erasure optimally according to the temperature inside the apparatus or the detected temperature of the magnetic recording medium.

  Further, when the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, prior erasure is performed at least once when data is recorded.

  With this configuration, sufficient advance erasure performance can be obtained even if the temperature in the magnetic recording / reproducing apparatus changes.

  When the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, the erasing current value for the preceding erasing performed when data is recorded is made larger than the current value for recording the data.

  Even with this configuration, sufficient advance erasure performance can be obtained even if the temperature in the magnetic recording / reproducing apparatus changes.

  The preceding erasure control is such that when the magnetic recording medium to be used is a longitudinal recording medium, the erasing pattern is a DC pattern, and when the magnetic recording medium to be used is a perpendicular recording medium, the erasing pattern is an AC pattern.

  With this configuration, an optimum erase pattern is provided according to the magnetic recording medium to be used.

  Further, the memory circuit built in or connected to the magnetic recording / reproducing apparatus of the present invention stores in advance the optimum number of preceding erase times, erase current, and erase pattern control information corresponding to the detected temperature.

  According to this configuration, it is possible to reliably set the optimum control condition (information) for preceding erasure according to the temperature inside the apparatus or the temperature of the magnetic recording medium.

  In the data recording method of the present invention, after the start of the recording operation, a step of setting an initial data recording condition, a step of detecting the temperature in the apparatus by the temperature detection circuit, and prior erasure are performed based on the detected temperature. A step of determining whether to perform preceding erasure, a step of setting control information of the preceding erasure in a control circuit of the apparatus, a step of performing a preceding erasing operation based on the control information, A step of recording data after erasing and a step of ending the recording operation, and when it is determined not to perform prior erasure, a step of recording data using the initial data recording conditions as they are, and a step of recording operation A step of ending.

  With this configuration, it is possible to control an optimum data recording method according to the internal temperature detected by the detection circuit or the temperature of the magnetic recording medium.

  The preceding erasure control is a method in which at least one parameter of the number of preceding erasures, the erase current, and the erase pattern is controlled by the detected temperature.

  With this configuration, it is possible to obtain a method for finely controlling the preceding erasure that is optimal in accordance with the temperature in the apparatus or the temperature of the magnetic recording medium.

  Further, when the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, prior erasure is performed at least once when data is recorded.

  With this configuration, sufficient advance erasure performance can be obtained even if the temperature in the magnetic recording / reproducing apparatus changes.

  When the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, the erasing current value for the preceding erasing performed when data is recorded is made larger than the current value for recording the data.

  Even with this configuration, sufficient advance erasure performance can be obtained even if the temperature in the magnetic recording / reproducing apparatus changes.

  In the preceding erasure control, when the magnetic recording medium to be used is a longitudinal recording medium, the erasing pattern is a DC pattern, and when the magnetic recording medium to be used is a perpendicular recording medium, the erasing pattern is an AC pattern.

  This configuration provides a method for providing an optimum erase pattern according to the magnetic recording medium to be used.

  Further, the control parameters for the number of preceding erasures, the erasing current, and the erasing pattern of the present invention are stored in advance in a memory circuit built in or connected to the magnetic recording / reproducing apparatus, and read out at a predetermined timing.

  According to this configuration, it is possible to reliably set the optimum pre-erase control conditions (information) according to the temperature in the apparatus or the temperature of the magnetic recording medium.

  According to the magnetic recording / reproducing apparatus and the data recording method of the present invention, even if the usage environment of the magnetic recording / reproducing apparatus changes, particularly in a low temperature environment, a predetermined recording / reproducing performance is ensured, and the quality of the recording / reproducing signal deteriorates. In the end, it can be built in or mounted in a portable information device. This expands the application range of the small magnetic recording / reproducing apparatus.

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

  FIG. 1 is a block diagram showing a main part of a magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention. In FIG. 1, the head disk assembly includes a magnetic recording medium 102, a magnetic head 101, a spindle motor (SPM) 103 for rotating the magnetic recording medium 102, and a head support member 104. The magnetic head 101 is mounted on a voice coil motor (VCM) 10 7 via a head support member 104, and the magnetic head 101 is positioned in the radial direction of the magnetic recording medium 102 by a current supplied from the VCM driver 108. The VCM driver 108 supplies current to the voice coil motor (VCM) 109 based on the control signal of the servo controller 115. The spindle motor 103 is supplied with a driving current from a spindle motor driver 107. Next, the preamplifier 105 is for driving a recording current to the magnetic head 101 and amplifying a signal reproduced from the magnetic recording medium 102 in order to record / reproduce a desired signal on the magnetic recording medium 102. . The read / write channel circuit 11 3 performs processing for generating digital recording / reproduction data. Then, the recording / reproducing data is sent to the control circuit 112 (hereinafter referred to as a hard disk controller). The read / write channel circuit 11 3 executes recording data encoding processing or reproduction data decoding processing at the timing of the gate sent from the hard disk controller 112. Further, the read / write channel circuit 112 performs reproduction processing of servo data at the timing of the servo gate output from the servo controller 114, sends out servo information including seek data and position error data to the servo controller 114, and the magnetic head. 101 positioning control is performed. The hard disk controller 112 functions as an interface with the host system and also manages data transfer control and the like. The preceding erasure control is composed of the hard disk controller 112, the CPU 110, and software for controlling them (not shown).

  Further, a temperature detection circuit 106 for detecting the temperature in the apparatus or the temperature of the magnetic recording medium is provided in the magnetic recording / reproducing apparatus. The memory circuit 111 stores firmware for overall control of the magnetic recording / reproducing apparatus and control information for preceding erasure according to the internal temperature detected by the temperature detection circuit 106 or the temperature of the magnetic recording medium 102. ing.

  Next, a data recording method including prior erasure in the magnetic recording / reproducing apparatus of the present invention will be described. FIG. 3 is a flowchart showing the data recording method according to Embodiment 1 of the present invention. First, when the start of the recording operation (step S1) is commanded, initial data recording conditions are set (step S2). The conditions at this time are set so as to assume data recording in a normal temperature range (for example, near room temperature). Next, the temperature in the apparatus or the temperature of the magnetic recording medium is detected using a temperature detection circuit arranged in the vicinity of the magnetic recording medium in the apparatus (step S3). Thereafter, based on the detected temperature, it is determined whether or not to perform prior erasure before recording new data (step S4). The threshold information for this determination is stored in advance in the memory circuit, and is read from the memory at the time of determining whether to perform prior erasure (step S31).

  Next, the operation (Yes in step S4) when it is determined to perform advance erasing will be described. Preliminary erasure setting information is set in the prior erasure controller (step S5). The control information for the prior erasure is the number of erasures, the erasing current, and the erasing pattern, and optimum control conditions are set according to the temperature inside the apparatus by the detection circuit or the temperature of the magnetic recording medium. Control information for erasing the erasing frequency, erasing current, and erasing pattern is stored in advance in the memory circuit, and is read from the memory circuit when setting the erasing control information in the control circuit of the apparatus. (Step S51). A pre-erase operation is performed under the set conditions (step S6). Thereafter, data is finally recorded (step S7). A series of recording operations are completed through these steps (step S8).

  The operation (No in step S4) when it is determined that the preceding erasure is not performed will be described. If it is determined that the prior erasure is not performed, the data in the general direct overwrite method is recorded because the temperature in the apparatus or the temperature of the magnetic recording medium is in the normal range (for example, near room temperature) (step S9). ). At this time, the data recording conditions set at the initial stage are used as they are. In this way, a series of recording operations is completed (step S10).

  In the present invention, the prior erasure is performed using the optimum conditions for the number of preceding erasures, the erasing current, and the erasing pattern according to the temperature in the apparatus. The optimum condition setting of the parameters for the temperature in the apparatus will be described. First, the relationship between each control parameter for the preceding erasure and the temperature in the apparatus or the temperature of the magnetic recording medium was examined.

FIG. 2 shows a main part of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention used in the experiment. Further, main specifications of the magnetic recording / reproducing apparatus will be described. The volume capacity of the magnetic recording / reproducing apparatus 201 is 3600 mm ³ , and the temperature detection circuit 20 4 is arranged in the vicinity of the magnetic recording medium 203 in the magnetic recording / reproducing apparatus 201. The magnetic head 202 is connected to the head IC 205 and integrated with the voice coil motor 206 via the head support mechanism. Although not shown in the drawing, a series of control circuits such as a read write channel circuit and a hard disk controller are mounted on the surface opposite to the magnetic recording medium 203 to constitute the magnetic recording / reproducing apparatus 201. The magnetic recording medium 203 used in the magnetic recording / reproducing apparatus 201 is a longitudinal recording medium, and its coercive force is 360 (kAT / m). Further, the magnetic head 202 used in the magnetic recording / reproducing apparatus 201 is a head element that has a surface recording density of about 140 to 160 Mbit / mm ² .

  In order to evaluate the characteristics of the magnetic recording / reproducing apparatus 201, a head output monitor and an error rate monitor terminal (not shown) were provided, and measurement was performed via a dedicated measurement circuit. Further, in order to change the temperature of the magnetic recording medium, the magnetic recording / reproducing apparatus 201 was placed in a constant temperature / humidity chamber or a constant temperature / humidity chamber.

  FIG. 4 shows the relationship between the number of prior erasures and the overwrite characteristics in the first embodiment of the present invention. A generally used method was used for evaluation of the overwrite characteristics. First, after recording a signal of 0.4 μm in terms of bit length, the output (F1) of the fundamental wave is measured. Next, a signal having a bit length of 0.065 μm is overwritten on a signal having a bit length of 0.4 μm. Then, the output (F1 ′) of the fundamental wave component having a bit length of 0.4 μm is measured from the overwritten signal. The logarithmic ratio of F1 and F1 'was used as the overwrite value. The preceding erasure here uses a DC (direct current) pattern, and the erasure current value is the same value as the overwrite current.

  As is apparent from FIG. 4, when the temperature in the apparatus is room temperature (25 ° C.), the overwrite value exceeds −30 dB without performing prior erasure. Usually, if the overwrite value is about -30 dB, it is a level with no practical problem. However, when the temperature in the apparatus is as low as −20 ° C., the overwrite value without prior erasure is about −22B, which is considerably deteriorated. However, it can be seen that the overwrite value is improved as the number of repetitions of prior erasure increases. The reason why the overwrite value improves as the number of erasures increases is that the slight data remaining after erasing (the recording medium depth direction and track width direction components) gradually decreases as the number of erasures increases. It seems to be for the purpose of becoming. As a result, when the ambient temperature is around −20 ° C., the number of preceding erasures is required to be 3 times or more in order to obtain an overwrite value around −30 dB.

  Next, FIG. 5 shows the relationship between the recording current ratio (Ie / Iw) and the overwrite characteristics in the first embodiment of the present invention. The above-described recording current ratio is defined by dividing the erasing current value by the recording current value when data is recorded. In this experiment, the overwriting performance when the recording current ratio is changed by changing the magnitude of the DC erasing current with the number of preceding erasures being fixed, and the data recording current being fixed is examined. As a result of the experiment, it was found that when the temperature in the apparatus is as low as −20 ° C., the overwrite value is about −30 dB if the recording current ratio is about doubled.

  Based on the relationship between the number of preceding erasures, the overwriting characteristics, the recording current ratio (Ie / Iw), and the overwriting characteristics, the optimum erasing conditions were examined in accordance with the ambient temperature or the magnetic recording medium temperature. FIG. 6 shows the relationship between the in-device temperature and the number of preceding erasures in Embodiment 1 of the present invention. According to this, when trying to obtain a level (−30 dB) having no practical problem, it is not necessary to perform prior erasing until the ambient temperature reaches 10 ° C., but if the temperature is lower than that, the number of times of erasing is stepwise. It is necessary to increase it. For example, when the ambient temperature is −20 ° C., three prior erasures are necessary.

  Next, FIG. 7 shows the relationship between the in-device temperature and the recording current ratio (Ie / Iw) in Embodiment 1 of the present invention. The change of the overwrite value was examined in the same way as the experiment for the number of prior erasures. In this case, when the ambient temperature is 10 ° C. or higher, the recording current ratio may be 1, but it is necessary to increase the recording current ratio as the temperature decreases. The reason why the overwrite value is improved when the recording current ratio is increased is that the slight data remaining after erasing (the recording medium depth direction and track width direction components) gradually increases as the recording current ratio increases. It is thought that it will be less.

  As a result of the experiment, it was found that the recording current ratio should be about 2 when the temperature in the apparatus is -20 ° C.

  Obtain the relationship between the temperature in the device, the number of previous erasures, and the recording current ratio, create a table of optimum conditions according to the detected temperature, and store it in advance in the memory circuit as the previous erasure control information. Even when the ambient environment of the apparatus changes, satisfactory recording / reproducing performance is always ensured.

  Next, in order to verify the effect of the invention in the magnetic recording / reproducing apparatus according to the first embodiment of the present invention, the comparison with the conventional magnetic recording / reproducing apparatus was performed with respect to the overwrite characteristic and the error rate characteristic. The magnetic recording / reproducing apparatus of the present invention used for the experiment is shown in FIG. As described above, in order to evaluate the characteristics of the magnetic recording / reproducing apparatus 201, a head output monitor and an error rate monitor terminal (not shown) were provided, and measurement was performed via a dedicated measurement circuit. In order to change the temperature of the magnetic recording medium, the magnetic recording / reproducing apparatus 201 is placed in a constant temperature / humidity chamber or a constant temperature / humidity chamber.

  Note that the difference between the conventional magnetic recording apparatus and the magnetic recording apparatus of the present invention is that the other parts, members, etc. are the same, only by whether or not the prior erasure is optimally controlled by the temperature detected by the temperature detection circuit. It is.

  First, the relationship between the internal temperature of the magnetic recording / reproducing apparatus or the temperature of the magnetic recording medium and the overwrite characteristic will be described. FIG. 8 compares the overwrite characteristics of the magnetic recording / reproducing apparatus according to Embodiment 1 of the present invention and the conventional magnetic recording / reproducing apparatus. As the evaluation of the overwrite characteristic, the above-described generally performed method was used. First, after recording a signal of 0.36 μm in terms of bit length, the output (F1) of the fundamental wave is measured. Next, a signal having a bit length of 0.06 μm is overwritten on a signal having a bit length of 0.36 μm. Then, the output (F1 ′) of the fundamental wave component having a bit length of 0.36 μm is measured from the overwritten signal. The logarithmic ratio of F1 and F1 'was used as the overwrite value. In the preceding erasure of the magnetic recording / reproducing apparatus according to the first embodiment of the present invention, the optimum number of preceding erasures and the recording current ratio are controlled based on the temperature detected by the temperature detection circuit 204.

  As a result of the experiment, it can be seen that the overwrite characteristics of the magnetic recording / reproducing apparatus of the present invention are greatly improved in the region where the temperature in the apparatus is lower than 0 degrees as compared with the magnetic recording / reproducing apparatus having the conventional configuration.

  Even if the recording capacity of the head is relatively lowered due to the coercive force of the magnetic recording medium being increased by placing the apparatus in a low temperature environment, in the case of the magnetic recording / reproducing apparatus of the present invention, the temperature inside the apparatus or the magnetic recording medium Since the number of preceding erasures and the recording current ratio are optimized in accordance with the temperature, good overwrite characteristics can be achieved.

Next, the error rate characteristics of the magnetic recording / reproducing apparatus in the first embodiment of the present invention will be described. FIG. 9 is a graph comparing the error rate characteristics with respect to the temperature in the apparatus in the magnetic recording / reproducing apparatus of the present invention and the conventional magnetic recording / reproducing apparatus. The error rate characteristics were also evaluated by a general method. First, a known data series is recorded in advance under the condition that the signal recorded on the magnetic recording medium is the highest and the surface recording density is about 140 Mbit / mm ² . Next, the error rate value was evaluated by demodulating the data reproduced from the magnetic recording medium and comparing it with the data sequence to be demodulated. As a result, as shown in FIG. 9, the magnetic recording / reproducing apparatus of the present invention has greatly improved error rate characteristics in the region where the temperature inside the apparatus is lower than 0 degrees as compared with the conventional magnetic recording / reproducing apparatus. I understand.

  It can be considered that the error rate characteristic of the conventional magnetic recording / reproducing apparatus is caused by the deterioration of the overwrite characteristic in a low temperature environment as a cause of the rapid deterioration in the low temperature region of the apparatus. On the other hand, in the case of the magnetic recording / reproducing apparatus of the present invention, even when the apparatus is placed in a low temperature environment, the overwrite characteristic is hardly deteriorated, so that the error rate characteristic can also be maintained at a good characteristic.

  In the embodiment of the present invention, a longitudinal recording medium is used, and the recording pattern of prior erasure is performed using a DC (direct current) pattern. However, when the magnetic recording medium uses a perpendicular recording medium, AC (alternating current) is used. ) It is sufficient to set the number of preceding erasures and the erasing current to the optimum values using a pattern, and even if the magnetic recording / reproducing apparatus is placed in a low temperature environment as in the case of using a longitudinal recording medium, the overwrite characteristics are deteriorated. Therefore, good data recording quality can be maintained, so that the final error rate characteristics can also be maintained with good characteristics.

  The magnetic recording / reproducing apparatus and the data recording method according to the present invention have a possibility of greatly expanding the operating environment of the magnetic recording / reproducing apparatus, and are incorporated in so-called portable information devices such as mobile phones and portable terminals. It is useful as a playback device. It can also be used for large-capacity memories such as digital cameras and digital video.

1 is a block diagram showing a main part of a magnetic recording / reproducing apparatus in Embodiment 1 of the present invention. The figure which shows the principal part of the magnetic recording / reproducing apparatus in Embodiment 1 of this invention. 1 is a flowchart showing a data recording method according to Embodiment 1 of the present invention. The figure which shows the relationship between the number of times of prior erasure and overwrite characteristics in Embodiment 1 of this invention The figure which shows the relationship between the recording current ratio (Ie / Iw) and the overwrite characteristic in Embodiment 1 of this invention. The figure which shows the relationship between the apparatus internal temperature in Embodiment 1 of this invention, and the number of times of prior erasure. The figure which shows the relationship between the apparatus internal temperature and recording-current ratio (Ie / Iw) in Embodiment 1 of this invention. The figure which compared the overwrite characteristic of the magnetic recording / reproducing apparatus in Embodiment 1 of this invention, and the conventional magnetic recording / reproducing apparatus The figure which compared the error rate characteristic of the magnetic recording / reproducing apparatus in Embodiment 1 of this invention, and the conventional magnetic recording / reproducing apparatus

Explanation of symbols

101 Magnetic head 102 Magnetic recording medium 103 Spindle motor (SPM)
104 Head support member 105 Preamplifier 106 Temperature detection circuit 107 Spindle motor driver 108 VCM driver 109 VCM
110 CPU
111 Memory circuit 112 Control circuit (hard disk controller)
113 Read / Write Channel Circuit 114 Servo Controller Circuit 201 Magnetic Recording Device 202 Magnetic Head 203 Magnetic Recording Medium 204 Temperature Detection Circuit 205 Preamplifier 206 Voice Coil Motor

Claims (12)

Magnetic recording / reproducing apparatus having a magnetic recording medium, a magnetic head for recording / reproducing information on / from the magnetic recording medium, a spindle motor for rotating the magnetic recording medium, and an electronic circuit for recording / reproducing data and controlling the apparatus In
A magnetic recording / reproducing apparatus comprising a circuit for detecting a temperature in the apparatus and controlling preceding erasure when data is recorded according to the detected temperature. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the preceding erasure controls at least one parameter of the number of preceding erasures, an erasing current, and an erasing pattern according to the detected temperature. 3. The magnetic recording / reproducing apparatus according to claim 2, wherein when the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, at least one preceding erasure is performed when data is recorded. 3. A magnetic recording / reproducing apparatus according to claim 2, wherein when the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, an erasing current value for preceding erasing performed when data is recorded is larger than a current value at which the data is recorded. apparatus. 3. In the preceding erasure control, when the magnetic recording medium to be used is a longitudinal recording medium, the erasing pattern is a DC pattern, and when the magnetic recording medium to be used is a perpendicular recording medium, the erasing pattern is an AC pattern. Magnetic recording / reproducing apparatus. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the control parameters of the number of preceding erasures, the erasing current, and the erasing pattern are stored in advance in a memory circuit built in or connected to the magnetic recording / reproducing apparatus. A step of setting an initial data recording condition after the start of a recording operation, a step of detecting a temperature in the apparatus by a temperature detection circuit, a step of determining whether to perform advance erasure based on the detected temperature, If it is determined that erasure is to be performed, the step of setting the preceding erasure control information in the control circuit of the apparatus, the step of performing the preceding erasing operation based on the control information, and the step of recording data after the preceding erasure A data recording step including a step of ending the recording operation, and a step of recording data using the initial data recording condition as it is and a step of ending the recording operation when it is determined not to perform the preceding erasure Method. 8. The data recording method according to claim 7, wherein in the preceding erasure, at least one parameter of the number of preceding erasures, an erasing current and an erasing pattern is controlled according to the detected temperature. 9. The data recording method according to claim 8, wherein when the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, the prior erasure is performed at least once when data is recorded. 9. The data recording method according to claim 8, wherein when the detected temperature in the magnetic recording / reproducing apparatus is equal to or lower than a predetermined temperature, an erasing current value for pre-erasing performed when recording data is larger than a current value for recording data. . 9. In the preceding erasure control, when the magnetic recording medium to be used is a longitudinal recording medium, the erasing pattern is a DC pattern, and when the magnetic recording medium to be used is a perpendicular recording medium, the erasing pattern is an AC pattern. Data recording method. 8. The data recording according to claim 7, wherein the control parameters for the number of preceding erasures, the erasing current, and the erasing pattern are stored in advance in a memory circuit built in or connected to the magnetic recording / reproducing apparatus and read out at a predetermined timing. Method.

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