JP2004234819A - Magnetic head for recording reproducing, magnetic recording medium and recording reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic head for recording reproducing which is capable of avoiding an occurrence of recording reproducing error without fail. <P>SOLUTION: The device is configured so that both magnetic recording width MWW and reproducing width MRW for a magnetic head 5 are wider than total width of two-fold width of off-track width OTW to a track T and track width TW of the track T for the magnetic head 5 at the time of recording reproducing for recording data, and that the width is narrower than the width in which the two-fold width of the off-track width OTW at the time of the recording reproducing is subtracted from the total width of the two-fold width of group width GW for a group G and the track width TW. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing magnetic head capable of recording / reproducing recording data on / from a discrete track type magnetic recording medium having a plurality of data recording tracks formed thereon, the magnetic recording medium, and the recording / reproducing magnetic head. The present invention relates to a recording / reproducing device including a head and a magnetic recording medium.

  Today, as a recording medium capable of high-density recording, a discrete track type recording medium (hereinafter, referred to as a “track”) formed with a plurality of concentric data recording tracks (hereinafter, also referred to as “tracks”) magnetically separated from each other. “Discrete track media” has been developed. The discrete track medium is mounted on, for example, an HDD (Hard Disk Drive) and magnetically records various types of recording data via a recording / reproducing magnetic head (hereinafter, also referred to as a “magnetic head”). In this case, in the discrete track medium, an increase in the effective recording track width due to the leakage magnetic field of the magnetic head is avoided by a nonmagnetic material portion such as a groove formed between the tracks, and recording and recording of recording data on an adjacent track is performed. In addition, the occurrence of reproduction (crosstalk) of recording data recorded on an adjacent track is reduced. Therefore, the pitch at which each track is formed (hereinafter, also referred to as “track pitch”) can be reduced, so that recording data can be recorded at a high density.

JP-A-6-111502 discloses a magnetic disk device including a magnetic disk (1) and a magnetic head (H) as a recording / reproducing device including such a discrete track medium and a magnetic head. I have. In this case, this type of recording / reproducing apparatus uses a servo mechanism based on a servo detection signal output from a magnetic head when reading a servo pattern (Ps) formed on a magnetic disk during recording / reproducing of recording data. Moves the magnetic head (servo control) so as to trace the center (Tc) of the track. On the other hand, in the same publication, in order to avoid occurrence of a tracking error, a magnetic effective reproducing head width of a magnetic head (magnetic reading width Wr), a track pitch of a magnetic disk (Tp), and a width of a servo pattern (Tp) are described. Ts) is specified to satisfy a predetermined standard. Specifically, both sizes are defined so that the effective reproducing head width is substantially equal to the track pitch, and the width of the servo pattern is defined so as to be substantially equal to the track pitch or a width of an integral multiple thereof. Thus, even if the magnetic head is displaced to some extent from the center of the track during the servo control, the change in the output of the tracking error signal does not become small, so that the occurrence of the tracking error can be avoided.
JP-A-6-111502 (pages 4-8)

  However, the conventional magnetic disk device has the following problems. That is, in the conventional magnetic disk drive, the size of each part of the magnetic disk and the magnetic head is defined mainly for the purpose of avoiding occurrence of a tracking error. Here, when the size of each part is specified when designing the recording / reproducing apparatus, not only the occurrence of the tracking error is avoided but also the recording error of the recording data with respect to the target track and the reproduction error of the recording data from the target track (hereinafter, referred to as “ It is necessary to define the size of each part of the magnetic disk and the magnetic head so as to avoid occurrence of “recording / reproducing error”. In this case, in this type of magnetic disk device (recording / reproducing device), even if the magnetic head is subjected to tracking servo control by the servo mechanism, the accuracy of reading the servo pattern by the magnetic head and the movement control amount error of the magnetic head by the servo mechanism are reduced. As a result, the magnetic head is displaced within a predetermined deviation width (so-called “off-track width”) from the recording track. On the other hand, the publication discloses that the effective reproducing head width is made wider than the recording track width (Tw) and the magnetic effective recording head width (magnetic writing width Ww) is made wider than the recording track width. ing. However, if the effective recording head width and the effective reproducing head width are slightly wider than the recording track width, the width of the magnetic track in the width direction of the recording track within the range of the effective recording head width and the effective reproducing head width in the misaligned state. May not be included. In such a state, it becomes difficult to sufficiently magnetize the recording track (normal recording of the recording data) when recording the recording data, or the normality of the magnetic signal recorded on the recording track when reproducing the recording data. Reading may be difficult. As described above, the conventional magnetic disk drive has a problem that it is difficult to reliably avoid occurrence of a recording / reproducing error.

  On the other hand, by setting the effective reproducing head width and the effective recording head width sufficiently larger than the recording track width, even if the magnetic head is displaced to some extent with respect to the recording track, the effective recording head width and the effective reproducing head of the magnetic head are reduced. It is possible to include the entire width of the recording track in the width range. Therefore, with such a configuration, it is possible to avoid occurrence of a recording / reproducing error. However, by making the effective recording head width and the effective reproducing head width larger than the recording track width, occurrence of a recording / reproducing error is avoided, and at the same time, recording data on the adjacent track and recording on the adjacent track are performed. In order to avoid the reproduction of the recorded data, the groove width between the tracks is increased to some extent (by increasing the track pitch), so that the effective recording head width and the effective reproducing head width of the magnetic head and the portion of the adjacent track between the adjacent tracks are increased. It is necessary to avoid overlap. For this reason, this conventional magnetic disk device has a problem that it is difficult to record recording data at high density while avoiding the occurrence of recording / reproducing errors, recording on adjacent tracks, and reproduction from adjacent tracks. Exists.

  The present invention has been made in view of the above problems, and has as its main object to provide a recording / reproducing magnetic head, a magnetic recording medium, and a recording / reproducing apparatus capable of reliably avoiding a recording / reproducing error. Further, a magnetic head for recording / reproducing, a magnetic recording medium and a recording / reproducing apparatus capable of achieving at least one of achieving high-density recording of recording data and avoiding occurrence of recording on an adjacent track and reproduction from an adjacent track are provided. To provide for other purposes.

  In order to achieve the above object, a magnetic head for recording / reproducing according to the present invention is a discrete track type magnetic recording in which a plurality of concentric data recording tracks magnetically separated from each other via a non-magnetic portion are formed. A recording / reproducing magnetic head configured to be capable of recording recording data on a medium and reproducing the recording data from the magnetic recording medium, wherein the magnetic effective recording head width is set at the time of recording the recording data. A width of at least twice the width of the off-track width of the recording / reproducing magnetic head with respect to the data recording track and the track width of the data recording track, and twice the width of the non-magnetic portion; Is less than or equal to the width obtained by subtracting twice the width of the off-track width during recording from the total width of the track width and the effective magnetic read head width, When reproducing the recording data, the recording / reproducing magnetic head is equal to or more than the total width of twice the off-track width with respect to the data recording track and the track width, and is equal to 2 times the width of the non-magnetic material portion. It is configured to be equal to or less than a width obtained by subtracting twice the width of the off-track width at the time of reproduction from the total width of the double width and the track width.

  In this case, in the recording / reproducing magnetic head according to the present invention, the effective recording head width is wider than the track pitch of the data recording track, and the effective reproducing head width is larger than the track pitch of the data recording track. Preferably, it is configured to be wider.

  Further, in the recording / reproducing magnetic head according to the present invention, the effective recording head width and the effective reproducing head width are equal to each other, and both head widths are equal to the track pitch of the data recording track. Preferably, it is configured.

  Further, in the magnetic recording medium according to the present invention, a plurality of concentric data recording tracks which are magnetically separated from each other via a non-magnetic material portion are formed, and recording data is recorded via a recording / reproducing magnetic head. A discrete track type magnetic recording medium configured to be capable of recording and reproduction, wherein a track width of the data recording track is determined based on a magnetic effective recording head width of the recording and reproduction magnetic head. The width of the recording / reproducing magnetic head is less than a width obtained by subtracting twice the off-track width of the data recording track at the time, and the recording data is obtained from the magnetic effective reproducing head width of the recording / reproducing magnetic head. The width obtained by subtracting twice the width of the off-track width of the recording / reproducing magnetic head with respect to the data recording track during the reproduction of And the total width of the track width and twice the width of the non-magnetic portion is not less than the total width of twice the off-track width and the effective recording head width during the recording. In addition, the width is twice as large as the width of the off-track width at the time of reproduction and the total width of the effective reproduction head width.

  In this case, in the magnetic recording medium according to the present invention, the track pitch of the data recording track is smaller than the effective recording head width of the recording / reproducing magnetic head, and the track pitch of the data recording track is the recording pitch. It is preferable that the reproducing magnetic head is configured to be narrower than the effective reproducing head width.

  Further, the magnetic recording medium according to the present invention is configured such that a track pitch of the data recording track is equal to both the effective recording head width and the effective reproduction head width of the recording / reproducing magnetic head. Is preferred.

  Further, a recording / reproducing apparatus according to the present invention includes any one of the above-described magnetic heads for recording / reproducing, and any one of the above-described magnetic recording media, and records the recording data on the magnetic recording medium and performs the magnetic recording. The recording data can be reproduced from the medium.

  According to the magnetic head for recording / reproducing, the magnetic recording medium, and the recording / reproducing apparatus of the present invention, both the effective recording head width and the effective reproducing head width are equal to or more than the total width of twice the off-track width and the track width. The size of each part is defined to be equal to or less than the width obtained by subtracting twice the width of the off-track width from the total width of the width twice the width of the non-magnetic part and the track width. No matter how the magnetic head is displaced within the range of the off-track width with respect to the data recording track at the time of recording / reproducing, the entire track width is within the range of the effective recording head width and the effective reproduction head width of the magnetic head. , And overlap between adjacent data recording tracks and portions of the effective recording head width and effective reproducing head width of the magnetic head can be avoided. As a result, it is possible to reliably avoid a recording / reproducing error, recording on an adjacent track, and reproduction from an adjacent track. Further, in order to avoid occurrence of recording on the adjacent track and reproduction from the adjacent track, both the effective recording head width and the effective reproducing head width are the total width of twice the width of the non-magnetic material portion and the track width. The recording data can be recorded at a higher density as compared with the case where the width is defined to exceed the width obtained by subtracting twice the off-track width from the width of the recording data.

  Further, according to the recording / reproducing magnetic head, the magnetic recording medium, and the recording / reproducing apparatus according to the present invention, the size of each part is specified so that the track pitch is narrower than both the effective recording head width and the effective reproducing head width. Accordingly, the track density can be increased, and the recording data can be recorded at a high density. Moreover, no matter how the magnetic head is displaced from the data recording track within the range of the off-track width during recording / reproducing of the recording data, a recording / reproducing error, recording on the adjacent track, and reproducing from the adjacent track will not occur. Occurrence can be avoided.

  According to the magnetic head for recording / reproducing, the magnetic recording medium, and the recording / reproducing apparatus of the present invention, the size of each part is set such that the effective recording head width and the effective reproducing head width are equal, and are equal to the track pitch. Stipulates that high-density recording of recording data can be achieved while avoiding the occurrence of recording / reproducing errors, and the track width can be maximized. A high-level reproduced signal can be obtained by efficiently reading a magnetic signal recorded on a recording track.

  Hereinafter, preferred embodiments of a magnetic head for recording / reproducing, a magnetic recording medium, and a recording / reproducing apparatus according to the present invention will be described with reference to the accompanying drawings.

  First, the configuration of the recording / reproducing apparatus 1 corresponding to the recording / reproducing apparatus according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the recording / reproducing apparatus 1 includes a motor 2, a hub 3, a servo mechanism 4, a magnetic head 5, a control unit 6, and a discrete track medium D. The motor 2 rotates the hub 3 under the control of the control unit 6, thereby rotating the discrete track medium D attached to the hub 3 at a constant angular speed, for example, at a constant speed. The servo mechanism 4 moves the magnetic head 5 on the discrete track medium D rotated by the motor 2 under the control of the control unit 6, and moves the magnetic head 5 in that state in the inner circumferential direction of the discrete track medium D. Or it is moved in the outer peripheral direction (tracking servo control). Since a specific method of the tracking servo control is well known, its description is omitted. The magnetic head 5 corresponds to the recording / reproducing magnetic head according to the present invention, and magnetically records (magnetizes the data recording track) and reproduces (records data on the data recording track) recording data on the discrete track medium D. (Reading of a magnetic signal) and outputting a predetermined output signal (read signal) when reproducing recorded data. As will be described later, the magnetic head 5 has the same magnetic effective recording head width (hereinafter, also referred to as “recording width”) MWW and the same effective reproducing head width (hereinafter, also referred to as “reproduction width”) MRW ( (Equal or nearly equal). The control unit 6 executes the rotation control of the motor 2 and the recording / reproduction control of the recording data on the discrete track medium D via the magnetic head 5. Further, the control unit 6 controls the servo mechanism 4 to move the magnetic head 5 to the inner or outer peripheral side of the discrete track medium D in accordance with the output state of the servo detection signal output by the magnetic head 5 when reproducing the recorded data. By moving (servo-controlling), the magnetic head 5 is turned on the track T on the discrete track medium D.

  The discrete track medium D corresponds to the discrete track type magnetic recording medium according to the present invention, and has a plurality of concentric tracks T, T. on a surface of a disk-shaped base material Db made of glass, aluminum, or the like. Are formed of a magnetic material, and a groove (groove) G corresponding to a non-magnetic material portion in the present invention is formed between adjacent tracks T. In this case, on the discrete track medium D, a large number of tracks T, T,... Are formed at a narrow pitch over almost the entire recording / reproducing area. Further, a servo pattern for tracking servo control is formed on the discrete track medium D. However, in the embodiment of the present invention, illustration and description are omitted in the same manner as in the servo control method. Further, the recording / reproducing apparatus 1 is actually an amplifier for amplifying and outputting an output signal output by the magnetic head 5, an A / D converter for digitally converting an output signal of the amplifier, and an external device (such as a personal computer). It has a data input / output I / F for transmitting and receiving recording data and the like, a power supply connector, and the like, but illustration and description thereof are omitted to facilitate understanding of the present invention.

  In this case, in the recording / reproducing apparatus 1, when tracking servo control of the magnetic head 5 is performed by the servo mechanism 4 and the controller 6, the center of the magnetic head 5 in the width direction of the recording width MWW and the reproduction width MRW and the width of the track T in the width direction are measured. A slight displacement may occur within a predetermined range from the center. As described above, this displacement is caused by the accuracy of reading the servo pattern by the magnetic head 5, the error of the movement control amount of the magnetic head 5 by the servo mechanism 4 and the control unit 6, and the like. The off-track width OTW (see FIG. 2) as the amount of displacement of the magnetic head 5 during recording and reproduction (the above-mentioned "predetermined range") is about 40 nm at the maximum. In the recording / reproducing apparatus 1, the track pitch Tp of each track T of the discrete track medium D is specified to be 300 nm, the track width TW of the track T is specified to be 200 nm, and the groove G The width GW is defined to be 100 nm. In this case, the track pitch TP of the tracks T, T,... Is defined to be equal (equal or substantially equal) to both the recording width MWW and the reproduction width MRW of the magnetic head 5. Further, the track width TW (200 nm) is equal to or less than the width (220 nm) obtained by subtracting twice the width (40 × 2 = 80 nm) of the off-track width OTW from the recording width MWW or the reproduction width MRW (300 nm) of the magnetic head 5. It is stipulated that The total width (400 nm) of the track width TW (200 nm) and the width twice as large as the groove width GW (100 × 2 = 200 nm) is equal to the recording width MWW or the reproduction width MRW (300 nm) of the magnetic head 5. The width is defined to be equal to or more than a total width (380 nm) of a width twice as large as the off-track width OTW (40 × 2 = 80 nm).

  On the other hand, as described above, the magnetic head 5 is defined so that both the recording width MWW and the reproduction width MRW are 300 nm, which is equivalent to the track pitch TP of the track T. In this case, the recording width MWW and the reproduction width MRW (300 nm) are equal to or more than the total width (280 nm) of the width (80 nm) twice the off-track width OTW and the track width TW (200 nm), and the groove width GW. The width is defined to be equal to or less than the width (320 nm) obtained by subtracting twice the width (80 nm) of the off-track width OTW from the total width (400 nm) of the double width (200 nm) and the track width TW (200 nm). .

  Next, the relationship between the size (width) of each part in the recording / reproducing apparatus 1 and the position of the magnetic head 5 and the track T when recording / reproducing recording data will be described with reference to the drawings.

  In the recording / reproducing apparatus 1, at the time of recording / reproducing recording data on the discrete track medium D, the magnetic head 5 performs on-track operation on one of the tracks T on the discrete track medium D by servo control by the servo mechanism 4 and the control unit 6. Let me do. At this time, since the size of each part is defined so that both the recording width MWW and the reproduction width MRW of the magnetic head 5 are wider than the track width TW of the track T, as shown by a solid line in FIG. In a state where the magnetic head 5 is on-track on the track T such that the center in the width direction of the head 5 and the center in the width direction of the track T substantially match, the width of the track T existing below the magnetic head 5 The entire direction (the portion shaded with diagonally left-sloping lines) is included in the range of the recording width MWW and the reproduction width MRW of the magnetic head 5 (the entire width direction of the track T is the recording width MWW and the reproduction width of the magnetic head 5 (It overlaps with the portion having the width MRW). Therefore, at the time of recording data, the entire width direction of the track T is sufficiently magnetized by the magnetic signal output from the magnetic head 5, and at the time of reproducing the recorded data, the magnetic signal recorded on the track T is reproduced. 5 to obtain a high-level output signal. As a result, the recorded data is reliably recorded and reproduced. In addition, since the size of each part is defined so that both the recording width MWW and the reproduction width MRW are smaller than the total width of twice the groove width GW and the track width TW, the adjacent tracks T, T And the recording head MRW and the reproduction width MRW of the magnetic head 5 are prevented from overlapping with each other. Therefore, the occurrence of recording on the adjacent track and reproduction from the adjacent track at the time of recording / reproducing the recording data is prevented.

  Further, in the recording / reproducing apparatus 1, even when the magnetic head 5 is displaced within a range of the off-track width OTW with respect to the track T, as shown by the one-dot chain line and the two-dot chain line in FIG. The data is reliably recorded and reproduced, and the recording on the adjacent track and the reproduction from the adjacent track are prevented. Specifically, the size of each part is defined such that both the recording width MWW and the reproduction width MRW of the magnetic head 5 are equal to or larger than the total width of twice the off-track width OTW and the track width TW of the track T. Therefore, even if the magnetic head 5 is displaced relative to the track T in any direction within the range of the off-track width OTW (irrespective of the state of the alternate long and short dash line), The entire width of the track T existing below the portion 5 (the portion shaded with oblique lines falling to the right) is included in the range of the recording width MWW and the reproduction width MRW of the magnetic head 5. Therefore, when recording the recording data, the entire width direction of the track T is sufficiently magnetized, and when reproducing the recording data, a high-level output signal is obtained. Also, each of the components is set so that both the recording width MWW and the reproduction width MRW are smaller than the width obtained by subtracting the width twice the off-track width OTW from the total width of the width twice the groove width GW and the track width TW. Since the size is specified, even if the magnetic head 5 is displaced in any direction with respect to the track T within the range of the off-track width OTW, the recording width of the adjacent tracks T, T and the magnetic head 5 Overlap with both portions of the MWW and the reproduction width MRW is avoided, and a gap (10 nm in this example) is generated between the adjacent tracks T, T and the portions of the recording width MWW and the reproduction width MRW. . Therefore, even if the magnetic head 5 is displaced, recording / reproduction of the recording data only on the track T existing below the magnetic head 5 is executed.

  In the recording / reproducing apparatus 1, both the recording width MWW and the reproducing width MRW are obtained by subtracting twice the off-track width OTW from the total width of twice the groove width GW and the track width TW. Since the size of each part is defined so as to be narrower, the gap between the adjacent track T and both the recording width MWW and the reproduction width MRW when the magnetic head 5 is displaced is 10 nm. It is a very small value. Therefore, each of the components is set so that both the recording width MWW and the reproduction width MRW are wider than the total width of twice the groove width GW and the track width TW minus the twice the off-track width OTW. As compared with a recording / reproducing apparatus having a prescribed size, the adjacent tracks T, T,... Can be made closer to each other, so that the track density can be increased, and recording and reproduction from the adjacent tracks can be performed. Recording data is recorded at a high density while occurrence is avoided.

  On the other hand, the discrete track medium D1 shown on the right side of FIG. 3 is formed such that the track width TW1 of the track T1 is smaller than the track width TW of the discrete track medium D shown on the left side of FIG. Specifically, the track width TW1 of the track T1 in the discrete track medium D1 is the off-track width OTW from the recording width MWW and the reproduction width MRW of the magnetic head 5 in the same manner as the track width TW of the track T in the discrete track medium D. The width is defined to be equal to or less than each width obtained by subtracting twice the width, and to be smaller than the track width TW of the track T in the discrete track medium D by twice the width S shown in FIG. Therefore, in the discrete track medium D1, similarly to the discrete track medium D, even when the magnetic head 5 is displaced within the range of the off-track width OTW with respect to the track T1, the recorded data can be surely recorded. Is recorded and played back.

  Also, in the discrete track medium D1, the track width TW1 and the width twice the groove width GW1 of the groove G1 are set in the same manner as in the discrete track medium D in order to avoid recording on the adjacent track and reproduction from the adjacent track. Are determined so that the total width of each part is equal to or larger than the total width of the recording width MWW and the reproduction width MRW of the magnetic head 5 and twice the width of the off-track width OTW. Specifically, the groove width GW1 of the groove G1 is defined to be wider than the groove width GW of the groove G in the discrete track medium D. For example, the groove width of the discrete track medium D1 is set such that the length from the center of the track T1 to the outer edge of the groove G1 is equal to the length from the center of the track T to the outer edge of the groove G in the discrete track medium D. GW1 is defined to be wider by the width S than the groove width GW of the groove G in the discrete track medium D. Therefore, in the discrete track medium D1, the track pitch TP1 is smaller than the recording width MWW and the reproduction width MRW of the magnetic head 5, and is smaller by the width S than the track pitch TP of the discrete track medium D. Only the track density has been increased. As a result, according to the discrete track medium D1, the recording data can be recorded at a high density, and the magnetic head 5 is positioned within the off-track width OTW with respect to the track T when recording and reproducing the recording data. Regardless of the positional deviation, it is possible to reliably prevent recording / reproducing errors, recording on adjacent tracks, and reproduction from adjacent tracks.

  As described above, according to the recording / reproducing apparatus 1, both the recording width MWW and the reproducing width MRW are equal to or larger than the total width of twice the off-track width OTW and the track width TW, and the groove width GW width is By stipulating the size of each part so as to be equal to or less than the width obtained by subtracting twice the off-track width OTW from the total width of the double width and the track width TW, the magnetic head 5 can record and reproduce the recording data. No matter how the position is shifted from the track T within the range of the off-track width OTW, the entire track width TW is included in the range of the recording width MWW and the reproduction width MRW of the magnetic head 5 and is adjacent to the track T. Overlap between the track T and the portion of the recording width MWW and the reproduction width MRW of the magnetic head 5 can be avoided. As a result, it is possible to reliably avoid a recording / reproducing error, recording on an adjacent track, and reproduction from an adjacent track. Further, in order to avoid the occurrence of recording on the adjacent track and reproduction from the adjacent track, both the recording width MWW and the reproduction width MRW are calculated based on the total width of twice the groove width GW and the track width TW from the off-track width. Compared to the case where the width is defined to exceed the width obtained by subtracting twice the width of the OTW, print data can be recorded at a higher density.

  Further, according to the recording / reproducing apparatus 1, the track density can be increased by defining the size of each part so that the track pitch TP1 is smaller than both the recording width MWW and the reproduction width MRW of the magnetic head 5. In addition, recording data can be recorded at a high density. Moreover, no matter how the magnetic head 5 is displaced within the range of the off-track width OTW with respect to the track T1 during recording / reproducing of the recording data, a recording / reproducing error, recording on an adjacent track, and reproduction from the adjacent track. Can be avoided.

  Further, according to the recording / reproducing apparatus 1, the size of each part is defined so that the recording width MWW and the reproducing width MRW are equal and the track pitch TP is equal, so that the occurrence of recording / reproducing errors and the like can be prevented. While avoiding this, high-density recording of the recording data can be achieved, and the track width TW can be maximized, so that when reproducing the recording data, the magnetic signal recorded on the track T can be efficiently converted. By reading, a high-level reproduction signal can be obtained.

  It should be noted that the present invention is not limited to the above-described embodiment of the invention, but can be appropriately modified. For example, in the embodiment of the present invention, the track pitch TP of the discrete track medium D is set to 300 nm, the track width TW is set to 200 nm, the groove width GW is set to 100 nm, and the recording width MWW and the reproduction width MRW of the magnetic head 5 are changed. Although an example in which both are set to 300 nm has been described, these numerical values are merely examples, and can be arbitrarily changed as long as the conditions in the present invention are satisfied. In addition, the present invention provides a method for defining the recording width MWW and the reproduction width MRW of the magnetic head 5 according to the size of each part in the discrete track medium D, and a method for discriminating the recording width MWW and the reproduction width MRW of the magnetic head 5. Each size may be defined based on any of the defining methods for defining the size of each unit in the track medium D. Further, the discrete track type recording medium of the present invention includes both a single-sided recording type and a double-sided recording type in which a plurality of concentric data recording tracks are formed on both sides of a substrate. The discrete track type recording medium of the present invention includes a recording medium in which a non-magnetic material is filled in a groove G.

1 is a configuration diagram illustrating a configuration of a recording / reproducing device 1 according to an embodiment of the present invention. The track width TW of the track T, the groove width GW of the groove G, the track pitch TP of the track T, the recording width MWW and the reproduction width MRW of the magnetic head 5, and the magnetic head 5 of the discrete track medium D of the recording / reproducing apparatus 1 FIG. 4 is a plan view for explaining a relationship between a track T and an off-track width OTW. Plan view for explaining the relationship between the track pitch TP1 of the discrete track medium D1 and the track pitch TP of the discrete track medium D according to another embodiment of the present invention, and the recording width MWW and reproduction width MRW of the magnetic head 5. It is.

Explanation of reference numerals

Reference Signs List 1 recording / reproducing device 5 magnetic head D, D1 discrete track medium G, G1 groove GW, GW1 groove width MRW reproduction width MWW recording width OTW off-track width T, T1 track TP, TP1 track pitch TW, TW1 track width

Claims (7)

Recording of recorded data on a discrete track type magnetic recording medium on which a plurality of concentric data recording tracks magnetically separated from each other via a non-magnetic portion are formed, and reproduction of recorded data from the magnetic recording medium A recording / reproduction magnetic head configured to be capable of
The magnetic effective recording head width is a sum of a width twice as large as an off-track width of the data recording track of the recording / reproducing magnetic head at the time of recording the recording data and a track width of the data recording track. Not less than the width obtained by subtracting twice the off-track width at the time of recording from the total width of the width twice as large as the width of the nonmagnetic portion and the track width, and Effective read head width is equal to or larger than the total width of the track width and twice the off-track width of the recording / reproducing magnetic head with respect to the data recording track during reproduction of the recording data, The recording is configured to be equal to or less than a width obtained by subtracting twice the width of the off-track width at the time of reproduction from the total width of twice the width of the non-magnetic portion and the track width. Raw for a magnetic head.   The recording according to claim 1, wherein the effective recording head width is wider than the track pitch of the data recording track, and the effective reproducing head width is wider than the track pitch of the data recording track. Magnetic head for reproduction. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the effective recording head width is equal to the effective reproducing head width, and both head widths are equal to the track pitch of the data recording track. head. A plurality of concentric circular data recording tracks which are magnetically separated from each other via a non-magnetic material portion, and are capable of recording and reproducing recording data via a recording / reproducing magnetic head. Type magnetic recording medium,
The track width of the data recording track is equal to the off-track width of the recording / reproducing magnetic head with respect to the data recording track at the time of recording the recording data from the magnetic effective recording head width of the recording / reproducing magnetic head. An off-track width of the recording / reproducing magnetic head with respect to the data recording track when reproducing the recording data from the magnetic effective reproducing head width of the recording / reproducing magnetic head. And the total width of the track width and twice the width of the non-magnetic portion is less than the width obtained by subtracting twice the width of the non-magnetic portion. The width is not less than the total width of the effective recording head width, and is not less than the total width of the double width of the off-track width during reproduction and the effective reproduction head width. The magnetic recording medium being.   The track pitch of the data recording track is smaller than the effective recording head width of the recording / reproducing magnetic head, and the track pitch of the data recording track is greater than the effective reproducing head width of the recording / reproducing magnetic head. 5. The magnetic recording medium according to claim 4, wherein the magnetic recording medium is configured to be narrow.   5. The magnetic recording medium according to claim 4, wherein a track pitch of the data recording track is configured to be equal to both the effective recording head width and the effective reproduction head width of the recording / reproducing magnetic head.   A recording / reproducing magnetic head according to any one of claims 1 to 3, and a magnetic recording medium according to any one of claims 4 to 6, wherein the recording of the recording data on the magnetic recording medium and the magnetic recording are performed. A recording / reproducing apparatus configured to be capable of reproducing the recording data from a recording medium.

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