Magnetic recording apparatus and magnetic recording system

Abstract

The invention provides a magnetic recording device and a magnetic recording system capable of obtaining stable operation. According to one embodiment, a magnetic recording apparatus includes a magnetic recording medium, a plurality of magnetic heads, and a control unit. Each of the plurality of magnetic heads includes a coil, a first magnetic pole, and a light emitting portion. The control unit performs a first operation. In the first operation, the control unit calculates life information relating to a remaining life time of one of the plurality of magnetic heads on the basis of first information relating to a failure probability of a magnetic head group including the plurality of magnetic heads and second information relating to a remaining time based on a history of the one of the plurality of magnetic heads.

Description

[0001] This application is based on Japanese Patent Application No. 2024-007504 (filing date: January 22, 2024), and claims priority therefrom. This application incorporates the entire content of that application by reference. Technical Field

[0002] Embodiments of the present invention relate to a magnetic recording device and a magnetic recording system. Background Art

[0003] In a magnetic recording device, a magnetic head is used to record information on a magnetic recording medium such as an HDD (Hard Disk Drive). In a magnetic recording device, stable operation is desired. Summary of the Invention

[0004] Embodiments of the present invention provide a magnetic recording device and a magnetic recording system capable of achieving stable operation.

[0005] Technical Solution for Solving the Problem

[0006] According to an embodiment, a magnetic recording device includes: a magnetic recording medium; a plurality of magnetic heads configured to record information on the magnetic recording medium; and a control unit configured to control the plurality of magnetic heads. Each of the plurality of magnetic heads includes: a coil; a first magnetic pole configured to generate a magnetic field corresponding to a recording current supplied to the coil; and a light emitting unit configured to irradiate the magnetic recording medium with light to locally increase the temperature of the magnetic recording medium. The control unit is configured to perform a first operation. In the first operation, the control unit calculates life information related to the remaining life time of one of the plurality of magnetic heads based on first information and second information, the first information being related to the failure probability of a magnetic head group including the plurality of magnetic heads, and the second information being related to the remaining time based on the history of the one of the plurality of magnetic heads.

[0007] According to the magnetic recording device having the above configuration, it is possible to provide a magnetic recording device and a magnetic recording system capable of achieving stable operation. Brief Description of the Drawings

[0008] Figure 1 It is a schematic diagram illustrating a magnetic recording device according to the first embodiment.

[0009] Figure 2 It is a schematic cross-sectional view illustrating a part of the magnetic recording device according to the first embodiment.

[0010] Figure 3 It is a schematic cross-sectional view illustrating a part of the magnetic recording device according to the first embodiment.

[0011] Figure 4It is a flowchart illustrating the operation of the magnetic recording device according to the first embodiment.

[0012] Figure 5 It is a schematic diagram illustrating a part of the magnetic recording device according to the first embodiment.

[0013] Reference Numeral Explanation

[0014] 30c: Coil, 31, 32: First magnetic pole, second magnetic pole, 75: Control unit, 75m: Storage unit, 76d: Display device, 76f: Acquisition unit, 76i: Input device, 77: Light emitting unit, 77G: Light guide, 77L: Light, 77S: Light source, 80: Magnetic recording medium, 80D: Disk, 83: Magnetization, 85: Head control circuit, 110: Magnetic head, 210: Magnetic recording device, 310: Magnetic recording system, I1, I2: First information, second information, I3: Lifetime information, Iw: Recording current, OP1, OP2: First operation, second operation. Detailed Embodiment

[0015] (First Embodiment)

[0016] Figure 1 It is a schematic diagram illustrating the magnetic recording device according to the first embodiment.

[0017] Figure 2 It is a schematic cross-sectional view illustrating a part of the magnetic recording device according to the first embodiment.

[0018] Figure 3 It is a schematic cross-sectional view illustrating a part of the magnetic recording device according to the first embodiment.

[0019] Figure 4 It is a flowchart illustrating the operation of the magnetic recording device according to the first embodiment.

[0020] As Figure 1 shown, the magnetic recording device 210 according to the embodiment includes a magnetic recording medium 80, a plurality of magnetic heads 110, and a control unit 75. The plurality of magnetic heads 110 are configured to record information on the magnetic recording medium 80. The control unit 75 is configured to control the magnetic heads 110.

[0021] Figure 2FIG. 0 is a schematic cross-sectional view illustrating a magnetic head 110. The magnetic head 110 includes a coil 30c and a first magnetic pole 31. The first magnetic pole 31 generates a magnetic field (recording magnetic field) corresponding to a recording current Iw supplied to the coil 30c. The generated magnetic field is applied to a magnetic recording medium 80. Thereby, the orientation of magnetization 83 of the magnetic recording medium 80 is controlled. The state of magnetization 83 corresponds to the information to be recorded. In this example, the magnetic head 110 further includes a second magnetic pole 32. The first magnetic pole 31 is, for example, a main magnetic pole. The second magnetic pole 32 is, for example, a trailing shield.

[0022] The magnetic head 110 further includes a light emitting unit 77. The light emitting unit 77 is configured to irradiate the magnetic recording medium 80 with light 77L to locally increase the temperature of the magnetic recording medium 80. For example, HAMR (Heat Assisted Magnetic Recording) is implemented.

[0023] For example, the light emitting unit 77 includes a light source 77S and an optical waveguide 77G. The light 77L emitted from the light source 77S is guided by the optical waveguide 77G. The light 77L emitted from the optical waveguide 77G is emitted to the magnetic recording medium 80 via, for example, an optical element or the like. The light source 77S is, for example, a laser.

[0024] As Figure 1 shown, the magnetic recording medium 80 may include a plurality of magnetic disks 80D. One of the plurality of magnetic heads 110 faces one of the plurality of magnetic disks 80D.

[0025] Figure 3 A plurality of magnetic heads 110 and a plurality of magnetic disks 80D are illustrated. The plurality of magnetic heads 110 are configured to record information on the plurality of magnetic disks 80D respectively. For example, one of the plurality of magnetic heads 110 records information on one of the plurality of magnetic disks 80D. For example, another one of the plurality of magnetic heads 110 records information on another one of the plurality of magnetic disks 80D.

[0026] For example, one of the plurality of magnetic heads 110 may also reproduce the information recorded on one of the plurality of magnetic disks 80D. For example, another one of the plurality of magnetic heads 110 may also reproduce the information recorded on another one of the plurality of magnetic disks 80D. The magnetic recording device 210 may be, for example, a magnetic recording and reproducing device.

[0027] As Figure 1 and Figure 2 shown, the magnetic recording device 210 may include a head control circuit 85. The head control circuit 85 supplies, for example, the recording current Iw to the coil 30c. The head control circuit 85 may control the light source 77S. The head control circuit 85 may supply power to the light source 77S.

[0028] The head control circuit 85 can process the signals reproduced by the heads 110. The processing may include, for example, amplification and AD conversion, etc.

[0029] As Figure 1 shown, the control unit 75 is connected to the head control circuit 85, for example. The control unit 75 controls the plurality of heads 110 and the magnetic recording medium 80 via the head control circuit 85, for example.

[0030] As Figure 1 shown, the magnetic recording apparatus 210 may further include a storage unit 75m. The storage unit 75m can store various information used in the operation of the control unit 75.

[0031] Figure 4 An example of the operation of the control unit 75 is shown.

[0032] As Figure 4 shown, the control unit 75 acquires the first information I1 (step S11). The control unit 75 acquires the second information I2 (step S12). These pieces of information may be stored in the storage unit 75m, for example. These pieces of information may be supplied from the storage unit 75m to the control unit 75, for example.

[0033] The first information I1 is related to the failure probability of the head group, for example. The head group includes a plurality of heads 110, for example. For example, the magnetic recording apparatus 210 as an object includes a plurality of heads 110 as an object. There is a product group having the same configuration as the magnetic recording apparatus 210 as an object. The heads included in the product group correspond to the above-mentioned head group. The failure probability of the head group varies according to, for example, the Bath-Tub curve, etc. The first information I1 is related to the failure probability of the product group having the same plurality of heads 110 as the object.

[0034] On the other hand, the second information I2 is related to the remaining time based on the history of one of the plurality of heads 110. For example, the second information I2 includes at least any one of the design conditions, manufacturing conditions, and inspection results related to one of the plurality of heads 110. For example, among the respective heads 110 of the plurality of heads 110, the manufacturing conditions or inspection results are different. For example, it may be that the design conditions, etc. are different among the respective heads 110 of the plurality of heads 110. The inherent characteristics of each of the plurality of heads 110 correspond to the second information I2.

[0035] As Figure 4 shown, in the first operation OP1, the control unit 75 calculates the life information I3 related to the remaining life time of the one head 110 among the plurality of heads 110 based on the first information I1 and the second information I2 (see Figure 1 )(step S21).

[0036] In an embodiment, for example, the life information I3 related to the remaining life time of one of the plurality of magnetic heads 110 is calculated based on the first information I1 related to the failure probability of the magnetic head group and the second information I2 inherent to the one magnetic head 110 among the plurality of magnetic heads 110. Thereby, the remaining life time can be estimated with higher accuracy. According to the embodiment, a magnetic recording apparatus capable of obtaining stable operation can be provided.

[0037] For example, the second information I2 is inherent to the plurality of magnetic heads 110. For example, the second information I2 related to the history of one of the plurality of magnetic heads 110 may be different from the second information I2 related to the history of another one of the plurality of magnetic heads 110.

[0038] As Figure 4 shown, the control unit 75 may be configured to perform the first operation OP1 on each of the plurality of magnetic heads 110 to calculate the life information I3 for each of the plurality of magnetic heads 110.

[0039] As Figure 4 shown, the control unit 75 may be configured to further perform the second operation OP2. In the second operation OP2, the control unit 75 determines the next magnetic head 110 based on the life information I3 related to the remaining life time of each of the plurality of magnetic heads 110 (step S31). The next magnetic head 110 is one of the plurality of magnetic heads 110 used when recording the next information on the magnetic recording medium 80.

[0040] The remaining life time of the next magnetic head 110 among the plurality of magnetic heads 110 is the longest among the remaining life times of the plurality of magnetic heads 110.

[0041] The second operation OP2 includes recording the next information on the magnetic recording medium 80 using the next magnetic head 110 among the plurality of magnetic heads 110 (step S41). For example, by performing recording using the magnetic head 110 with the longest remaining life time, stable operation can be obtained over a long period in the whole of the plurality of magnetic heads 110.

[0042] As Figure 4 shown, after step S41, step S12 (and step S11) may be returned. In the embodiment, steps S11, S12, S21, S31, and S41 may be repeatedly performed.

[0043] For example, the control unit 75 may be configured to repeatedly perform the first operation OP1. The second information I2 may be updated by the repetition of the first operation OP1. The updated second information I2 may be stored in the storage unit 75m.

[0044] For example, the history of each of the plurality of magnetic heads 110 can be updated corresponding to the recording of each of the plurality of magnetic heads 110.

[0045] For example, the history of one of the plurality of magnetic heads 110 includes the characteristics when one of the plurality of magnetic heads 110 is used for recording. The characteristics when one of the plurality of magnetic heads 110 is used for recording can include recording conditions and the like.

[0046] For example, the history of one of the plurality of magnetic heads 110 can include the characteristics after one of the plurality of magnetic heads 110 is used for recording.

[0047] For example, the history of one of the plurality of magnetic heads 110 includes the state of one of the plurality of magnetic heads 110 after the start of use.

[0048] For example, the remaining time based on the history of one of the plurality of magnetic heads 110 can be obtained by inputting the past characteristics of one of the plurality of magnetic heads 110 to the first machine learning model. The first machine learning model can be, for example, a neural network model.

[0049] For example, the failure probability of the magnetic head group can be obtained by inputting the characteristics of the magnetic head group after the start of use to the second machine learning model. The second machine learning model can be, for example, a neural network model.

[0050] For example, the failure probability of the magnetic head group can be based on the cumulative use time. As has been described, the light emitting unit 77 includes a light source 77S that emits light 77L. The failure probability of the magnetic head group can be based on the value of the power supplied to the light source 77S. The failure probability of the magnetic head group can be based on the value of the current supplied to the light source 77S.

[0051] In an embodiment, the remaining life time of one of the plurality of magnetic heads 110 can be derived based on the following first formula.

[0052]

Mathematical formula 1

[0053] LT pos (D a ,D b )=(1 - P(D a ))×LT pri (D a ,D b )…(1)

[0054] In the first formula, LT pos (D a ,D b) is the estimated remaining life time of one of the plurality of magnetic heads 110. "D" a " is the data after the start of use of the magnetic recording device 210 as the object. "D" b " is the data before the start of use of the magnetic recording device 210 as the object.

[0055] P(D a ) is the failure rate of the magnetic recording device 210 as the object, obtained based on the information after the start of use of the magnetic recording device 210 as the object. The information after the start of use includes, for example, the cumulative operation time of the plurality of magnetic heads 110. The information after the start of use can include, for example, the power (or current) supplied to the light source 77S. The failure rate (P(D a )) is obtained, for example, based on accelerated test data, etc. The failure rate (P(D a )) can be included in the first information I1, for example.

[0056] In the first formula, LT pri (D a , D b ) is the potential life of one of the plurality of magnetic heads 110. The potential life is obtained, for example, based on the inspection results of one of the plurality of magnetic heads 110, etc. The potential life is obtained, for example, by inputting the inspection results, etc. into a machine learning model, which is obtained based on accelerated test data, etc. The life is estimated by the machine learning model. LT pri (D a , D b ) corresponds, for example, to the remaining time based on the history of one of the plurality of magnetic heads 110. LT pri (D a , D b ) can be included in the second information I2, for example.

[0057] As shown in the first formula, when the failure probability of the magnetic head group is set to P(D a ), the remaining life time (LT pos (D a , D b )) of one of the plurality of magnetic heads 110 can be the product of the remaining time (LT pri (D a , D b ) based on the history of one of the plurality of magnetic heads and (1 - P(D a ).

[0058] "1 - P(D a)” is a function of the failure probability of the head group. The remaining life time of one of the plurality of heads 110 can be the product of the function of the failure probability of the head group and the remaining time based on the history of one of the plurality of heads 110.

[0059] In an embodiment, the control unit 75 may be configured to obtain the first information I1 and the second information I2 from a storage unit 75m configured to store the first information I1 and the second information I2, and perform the first operation OP1.

[0060] The control unit 75 may obtain the first information I1 and the second information I2 from a storage unit 75m configured to store the first information I1 and the second information I2, and repeatedly perform the first operation OP1. As already described, the second information I2 is updated by the repetition of the first operation OP1. The storage unit 75m may be configured to store the updated second information I2.

[0061] The storage unit 75m may be included in the magnetic recording device 210. The storage unit 75m may be provided independently of the magnetic recording device 210.

[0062] Figure 5 is a schematic diagram showing a part of the magnetic recording device according to the first embodiment.

[0063] As Figure 5 shown, the magnetic recording device 210 may include a control unit 75. The magnetic recording device 210 may further include a storage unit 75m. The magnetic recording device 210 may include an acquisition unit 76f, a display device 76d, an input device 76i, etc. The acquisition unit 76f is configured to acquire the first information I1 and the second information I2, for example. The acquisition unit 76f may supply the acquired information to the control unit 75. The acquisition unit 76f may output life information I3, for example. The acquisition unit 76f is an interface, for example. The control unit 75 may include a processor, for example.

[0064] (Second Embodiment)

[0065] The second embodiment relates to a magnetic recording system 310 (refer to Figure 1 ). The magnetic recording system 310 includes the magnetic recording device 210 according to the embodiment and the storage unit 75m. The transmission and reception of information between the magnetic recording device 210 and the storage unit 75m may be performed by any method of wired or wireless.

[0066] The embodiment may also include the following technical solutions.

[0067] (Technical Solution 1)

[0068] A magnetic recording device, comprising:

[0069] A magnetic recording medium;

[0070] A plurality of magnetic heads configured to record information on the magnetic recording medium; and

[0071] A control unit configured to control the plurality of magnetic heads,

[0072] Each of the plurality of magnetic heads includes:

[0073] A coil;

[0074] A first magnetic pole configured to generate a magnetic field corresponding to a recording current supplied to the coil; and

[0075] A light emitting unit configured to irradiate the magnetic recording medium with light to locally increase the temperature of the magnetic recording medium,

[0076] The control unit is configured to perform a first operation,

[0077] In the first operation, the control unit calculates life information related to the remaining life time of one of the plurality of magnetic heads based on first information and second information. The first information is related to the failure probability of a magnetic head group including the plurality of magnetic heads, and the second information is related to the remaining time based on the history of the one of the plurality of magnetic heads.

[0078] (Technical solution 2)

[0079] The magnetic recording device according to technical solution 1,

[0080] The control unit is configured to perform the first operation on each of the plurality of magnetic heads to calculate the life information about each of the plurality of magnetic heads.

[0081] (Technical solution 3)

[0082] The magnetic recording device according to technical solution 2,

[0083] The control unit is configured to further perform a second operation,

[0084] In the second operation, the control unit determines the next magnetic head to be used when recording the next information on the magnetic recording medium based on the life information related to the remaining life time of each of the plurality of magnetic heads.

[0085] (Technical solution 4)

[0086] The magnetic recording device according to technical solution 3,

[0087] The remaining life time of the next magnetic head among the plurality of magnetic heads is the longest among the remaining life times of each of the plurality of magnetic heads.

[0088] (Technical Solution 5)

[0089] The magnetic recording device according to Technical Solution 3 or 4,

[0090] The second operation includes using the next head among the plurality of heads to record the next information on the magnetic recording medium.

[0091] (Technical Solution 6)

[0092] The magnetic recording device according to any one of Technical Solutions 1 to 5,

[0093] The history includes the characteristics when one of the plurality of heads is used for recording.

[0094] (Technical Solution 7)

[0095] The magnetic recording device according to Technical Solution 6,

[0096] The history includes the characteristics after one of the plurality of heads is used for recording.

[0097] (Technical Solution 8)

[0098] The magnetic recording device according to any one of Technical Solutions 1 to 7,

[0099] The second information includes at least any one of design conditions, manufacturing conditions, and inspection results related to one of the plurality of heads.

[0100] (Technical Solution 9)

[0101] The magnetic recording device according to any one of Technical Solutions 1 to 8,

[0102] The second information related to the history of one of the plurality of heads is different from the second information related to the history of another one of the plurality of heads.

[0103] (Technical Solution 10)

[0104] The magnetic recording device according to any one of Technical Solutions 1 to 9,

[0105] The remaining life time of one of the plurality of heads is the product of a function of the failure probability of the head group and the remaining time based on the history of one of the plurality of heads.

[0106] (Technical Solution 11)

[0107] The magnetic recording device according to any one of Technical Solutions 1 to 10,

[0108] The remaining time based on the history of one of the plurality of magnetic heads is obtained by inputting the past characteristics of one of the plurality of magnetic heads into a first machine learning model.

[0109] (Technical solution 12)

[0110] According to the magnetic recording device according to any one of Technical solutions 1 to 11,

[0111] The history of one of the plurality of magnetic heads includes the state of one of the plurality of magnetic heads after the start of use.

[0112] (Technical solution 13)

[0113] According to the magnetic recording device according to any one of Technical solutions 1 to 12,

[0114] The failure probability of the magnetic head group is based on the cumulative usage time.

[0115] (Technical solution 14)

[0116] According to the magnetic recording device according to any one of Technical solutions 1 to 13,

[0117] The light emitting unit includes a light source that emits the light,

[0118] The failure probability of the magnetic head group is based on the power supplied to the light source.

[0119] (Technical solution 15)

[0120] According to the magnetic recording device according to any one of Technical solutions 1 to 14,

[0121] The failure probability of the magnetic head group is obtained by inputting the characteristics of the magnetic head group after the start of use into a second machine learning model.

[0122] (Technical solution 16)

[0123] According to the magnetic recording device according to any one of Technical solutions 1 to 15,

[0124] The control unit is configured to repeatedly execute the first operation,

[0125] The second information is updated by the repetition of the first operation.

[0126] (Technical solution 17)

[0127] According to the magnetic recording device according to any one of Technical solutions 1 to 16,

[0128] The control unit is configured to obtain the first information and the second information from a storage unit configured to store the first information and the second information, and perform the first action.

[0129] (Technical solution 18)

[0130] The magnetic recording device according to any one of technical solutions 1 to 15,

[0131] The control unit obtains the first information and the second information from a storage unit configured to store the first information and the second information, and performs the first action,

[0132] The control unit is configured to repeatedly perform the first action,

[0133] The second information is updated by the repetition of the first action,

[0134] The storage unit is configured to store the updated second information.

[0135] (Technical solution 19)

[0136] The magnetic recording device according to any one of technical solutions 1 to 16,

[0137] Further includes a storage unit,

[0138] The storage unit is configured to store at least any one of the first information and the second information.

[0139] (Technical solution 20)

[0140] A magnetic recording system includes:

[0141] The magnetic recording device according to technical solution 17 or 18; and

[0142] The storage unit.

[0143] According to the embodiment, a magnetic recording device and a magnetic recording system capable of obtaining stable operation can be provided.

[0144] As described above, the embodiments of the present invention have been described with reference to specific examples. However, the present invention is not limited to these specific examples. For example, regarding the specific configurations of each element such as the magnetic recording medium, the magnetic head, and the control unit included in the magnetic recording device and the magnetic recording system, as long as those skilled in the art can similarly implement the present invention and obtain the same effects by appropriately selecting from the known range, they are included in the scope of the present invention.

[0145] For technical solutions obtained by combining any two or more elements of the specific examples within the technically feasible range, as long as they include the gist of the present invention, they are included in the scope of the present invention.

[0146] In addition, for all magnetic recording devices and magnetic recording systems that can be appropriately designed and modified by those skilled in the art based on the magnetic recording device and magnetic recording system described above as embodiments of the present invention, as long as they embody the gist of the present invention, they also fall within the scope of the present invention.

[0147] In addition, within the scope of the idea of the present invention, those skilled in the art can conceive of various modification examples and correction examples, and those modification examples and correction examples are also understood to fall within the scope of the present invention.

[0148] Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and / or their variations are included within the scope and gist of the invention, and are included within the scope of the invention described in the claims and its equivalents.

Claims

1. A magnetic recording device, comprising: A magnetic recording medium; A plurality of magnetic heads configured to record information on the magnetic recording medium; and A control unit configured to control the plurality of magnetic heads, Each of the plurality of magnetic heads includes: A coil; A first magnetic pole configured to generate a magnetic field corresponding to a recording current supplied to the coil; and A light emitting unit configured to irradiate the magnetic recording medium with light to locally increase the temperature of the magnetic recording medium, The control unit is configured to perform a first operation, In the first operation, the control unit calculates life information related to the remaining life time of one of the plurality of magnetic heads based on first information and second information. The first information is related to the failure probability of a magnetic head group including the plurality of magnetic heads, and the second information is related to the remaining time based on the history of the one of the plurality of magnetic heads.

2. The magnetic recording device according to claim 1, The control unit is configured to perform the first operation on each of the plurality of magnetic heads to calculate the life information for each of the plurality of magnetic heads.

3. The magnetic recording device according to claim 2, The control unit is configured to further perform a second operation, In the second operation, the control unit determines the next magnetic head to be used when recording the next information on the magnetic recording medium based on the life information related to the remaining life time of each of the plurality of magnetic heads.

4. The magnetic recording device according to claim 3, The remaining life time of the next magnetic head among the plurality of magnetic heads is the longest among the remaining life times of the plurality of magnetic heads.

5. The magnetic recording device according to claim 3, The second operation includes using the next magnetic head among the plurality of magnetic heads to record the next information on the magnetic recording medium.

6. The magnetic recording device according to claim 1, The second information includes at least any one of design conditions, manufacturing conditions, and inspection results related to the one of the plurality of magnetic heads.

7. The magnetic recording device according to claim 1, The remaining life time of the one of the plurality of magnetic heads is the product of a function of the failure probability of the magnetic head group and the remaining time based on the history of the one of the plurality of magnetic heads.

8. The magnetic recording device according to claim 1, The control unit is configured to repeatedly perform the first operation, The second information is updated by the repetition of the first operation.

9. The magnetic recording device according to claim 1, Further includes a storage unit, The storage unit is configured to store at least any one of the first information and the second information.

10. A magnetic recording system, comprising: The magnetic recording device according to claim 1; and A storage unit configured to store the first information and the second information, The control unit is configured to obtain the first information and the second information from the storage unit to perform the first operation.

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