CN113889151B - Mechanical hard disk data reading and writing method and system based on ferromagnetic material - Google Patents
Mechanical hard disk data reading and writing method and system based on ferromagnetic material Download PDFInfo
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- CN113889151B CN113889151B CN202111227762.1A CN202111227762A CN113889151B CN 113889151 B CN113889151 B CN 113889151B CN 202111227762 A CN202111227762 A CN 202111227762A CN 113889151 B CN113889151 B CN 113889151B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/09—Digital recording
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
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- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a method and a system for reading and writing mechanical hard disk data based on ferromagnetic materials, wherein the method comprises the following steps: dividing the current data to be written into a plurality of data strings containing multi-bit binary data in sequence; magnetizing the ferrite covered on the surface of the disk by a magnetic head so that the magnetic moment directions of magnetic domains in the ferrite are all kept in the same direction; according to the corresponding relation between the preset data string and the writing voltage, the writing voltage corresponding to the data string to be written is applied to the ferrite through the magnetic head, and the magnetic moment direction of each magnetic domain inside the ferrite generates a deflection angle which is uniquely corresponding and is determined by the material characteristics of the ferrite. In this way, data is recorded on the disk by the magnetic moment directions of the magnetic domains of the ferrites, and since each ferrite can record a data string containing multi-bit binary data, the data storage capacity can be improved by several times theoretically, and the data storage capacity of the mechanical hard disk can be improved on the basis of avoiding the increase of the disk scale.
Description
Technical Field
The invention relates to the technical field of hard disks, in particular to a mechanical hard disk data reading and writing method based on ferromagnetic materials. The invention also relates to a mechanical hard disk data read-write system based on the ferromagnetic material.
Background
Hard disks are an important data storage medium, and are widely used in electronic devices such as servers, PCs, network attached storage systems, cloud spaces, and the like.
According to the different modes of Hard Disk to data storage, it can be classified into a mechanical Hard Disk (HDD) and a Solid State Disk (SSD). The mechanical hard disk is formed by stacking a plurality of layers of disks, each layer of disk is usually made of aluminum or glass materials, and magnetic material layers are coated on the upper surface and the lower surface of each disk, so that digital data can be stored in a magnetic mode. The more disks that are stacked inside a mechanical hard disk, the greater its capacity.
A plurality of magnetic heads are usually arranged in the mechanical hard disk, each magnetic head is also in a vertical stacking state, and one magnetic head corresponds to one surface of one layer of disk. Each magnetic head is divided into a reader and a writer, wherein the writer is mainly used for writing (storing) data on the disk surface, and the reader is mainly used for reading (restoring) data on the disk surface.
Mechanical hard disks mainly store data by using magnetic materials, in particular, record data or write data by magnetizing and changing the magnetic pole direction of ferromagnetic particles on the disk surface, and when writing data, binary data is represented by ferromagnetic particles wrapped in thin wire coils of a writer, for example, the N pole of the ferromagnetic particles is upward and the S pole is downward, then it is denoted as "0", and conversely "1"; when reading data, the mechanical hard disk reads data from the disk surface by detecting magnetization transitions of the magnetoresistive material of the reader, which changes the resistance of the material in the presence of a magnetic field, and then converts the resistance value into binary data.
However, the ferromagnetic particles in the prior art can only record 1B data according to the change of the magnetic pole orientation, 8 ferromagnetic particles are needed for recording 1B data, and the disc area and the disc number of the mechanical hard disc are limited, so that the data storage capacity of the mechanical hard disc is limited and is difficult to be improved.
Therefore, how to increase the data storage capacity of a mechanical hard disk while avoiding an increase in the disk size is a technical problem faced by those skilled in the art.
Disclosure of Invention
The invention aims to provide a mechanical hard disk data read-write method based on ferromagnetic materials, which can improve the data storage capacity of the mechanical hard disk on the basis of avoiding increasing the disk scale. Another object of the present invention is to provide a mechanical hard disk data read-write system based on ferromagnetic materials.
In order to solve the technical problems, the invention provides a mechanical hard disk data reading and writing method based on ferromagnetic materials, which comprises the following steps:
dividing the current data to be written into a plurality of data strings containing multi-bit binary data in sequence;
magnetizing ferrite covered on the surface of the disk by a magnetic head so that the magnetic moment directions of magnetic domains in the ferrite are all kept in the same direction;
according to the corresponding relation between the preset data string and the writing voltage, the writing voltage corresponding to the data string to be written is applied to the ferrite through the magnetic head, and the magnetic moment direction of each magnetic domain inside the ferrite generates a deflection angle which is uniquely corresponding and is determined by the material characteristics of the ferrite.
Preferably, the method further comprises:
identifying the magnetic moment direction of each magnetic domain in the ferrite through the magnetic head and judging the corresponding deflection angle;
converting the identified deflection angle into a corresponding writing voltage according to the corresponding relation between the deflection angle and the writing voltage, which is determined by the material characteristics of the ferrite;
converting the writing voltage into a corresponding data string according to the corresponding relation between the preset data string and the writing voltage;
each of the data strings is sequentially integrated into read data.
Preferably, the current data to be written is sequentially split into a plurality of data strings containing a plurality of bits of binary data, which specifically comprises:
the current data to be written is sequentially split into a number of data strings containing 2-bit binary data.
Preferably, the current data to be written is sequentially split into a plurality of data strings containing a plurality of bits of binary data, which specifically comprises:
the current data to be written is sequentially split into a number of data strings containing 4-bit binary data.
Preferably, when a writing voltage corresponding to a data string to be written currently is applied to the ferrite through the magnetic head, the writing voltage is v=0.05xk, where K is a decimal integer corresponding to the data string to be written currently.
Preferably, when a write voltage corresponding to a data string to be written currently is applied to the ferrite by the magnetic head:
if the data string is within the range of [0000,0111], the magnetic head applies a write voltage corresponding to the data string to be written currently to the ferrite;
if the data string is in the range of [1000,1111], firstly calculating a difference value obtained by subtracting 8 from a decimal integer corresponding to the data string, then applying a write voltage corresponding to the data string corresponding to the difference value to a first ferrite of two adjacent ferrites through the magnetic head, and applying an identification voltage to a second ferrite; wherein, the corresponding data string of the identification voltage is "1000".
Preferably, when the data strings are sequentially integrated into the read data, if the second ferrite of the two adjacent ferrites has the identification voltage, the sum of the data string '1000' and the corresponding data string identified by the first adjacent ferrite is taken as the common read data of the two adjacent ferrites.
Preferably, the magnetic head recognizes a magnetic moment direction of each magnetic domain in the ferrite and determines a corresponding deflection angle, and specifically includes:
and detecting the N-pole distance and the S-pole distance from the magnetic head to the ferrite through the magnetic head, and judging the magnetic moment deflection angle of each magnetic domain through the magnetic induction intensity of the ferrite.
The invention also provides a mechanical hard disk data read-write system based on ferromagnetic materials, which comprises:
the data splitting module is used for sequentially splitting the current data to be written into a plurality of data strings containing multi-bit binary data;
the initial magnetization module is used for magnetizing the ferrite covered on the surface of the disk through the magnetic head so as to keep the magnetic moment directions of magnetic domains in the ferrite in the same direction;
and the pressurizing storage module is used for applying a writing voltage corresponding to the current data string to be written to the ferrite through the magnetic head according to the corresponding relation between the preset data string and the writing voltage, and enabling the magnetic moment direction of each magnetic domain inside the ferrite to generate a corresponding deflection angle determined by the material characteristics of the ferrite.
Preferably, the method further comprises:
the magnetic domain identification module is used for identifying the magnetic moment direction of each magnetic domain in the ferrite through the magnetic head and judging the corresponding deflection angle;
the first conversion module is used for converting the identified deflection angle into a corresponding writing voltage according to the corresponding relation between the deflection angle and the writing voltage, which is determined by the material characteristics of the ferrite;
the second conversion module is used for converting the writing voltage into a corresponding data string according to the corresponding relation between the preset data string and the writing voltage;
and the data integration module is used for sequentially integrating the data strings into read data.
The invention provides a mechanical hard disk data read-write method based on ferromagnetic materials, which mainly comprises three steps. In the first step, the current data to be written is firstly split into a plurality of data strings according to the sequence, each data string contains multi-bit (more than 2 bits) binary data, and the bits of the binary data contained in each data string are the same. In the second step, the ferrite covered on the surface of the disk is magnetized by the magnetic head, so that the magnetic moment directions of magnetic domains in the ferrite are all kept in the same direction (generally the same as the direction of the magnetic head), and the ferrite further shows the magnetism of a specific magnetic pole. In the third step, firstly, according to the corresponding relation between the preset data string and the writing voltage, the writing voltage corresponding to each data string after the current data to be written is split is determined in sequence, then the writing voltage corresponding to the current data string to be written is applied to the current ferrite through the magnetic head, at the moment, the magnetic moment direction of each magnetic domain in the ferrite generates certain deflection under the influence of the external voltage (or the electric field) due to the material characteristics of the ferrite, and the deflection angle of the magnetic moment direction of the magnetic domain corresponds to the external voltage value applied to the ferrite one by one. Thus, the different deflection angles of the magnetic moment directions of the magnetic domains in the ferrite represent different writing voltages applied when writing data, and the different writing voltages correspond to different data strings respectively, so that data information is recorded and stored on the disk through the magnetic moment directions of the magnetic domains in the ferrite. Compared with the prior art that each ferrite can only record 1b of data, each ferrite can record a data string containing multi-bit binary data (a plurality of b), so that the data recording and storage capacity can be improved by a plurality of times theoretically, and the data storage capacity of the mechanical hard disk can be improved on the basis of avoiding the increase of the disk scale.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the correspondence relationship between the data string, the writing voltage and the deflection angle.
Fig. 3 is a system block diagram of an embodiment of the present invention.
Wherein, in fig. 3:
the device comprises a data splitting module-1, an initial magnetization module-2, a pressurized storage module-3, a magnetic domain identification module-4, a first conversion module-5, a second conversion module-6 and a data integration module-7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a method according to an embodiment of the present invention.
In one specific embodiment provided by the invention, the mechanical hard disk data reading and writing method based on the ferromagnetic material mainly comprises three steps of:
s1, dividing the current data to be written into a plurality of data strings containing multi-bit binary data in sequence;
s2, magnetizing ferrite covered on the surface of the disc through a magnetic head so that the magnetic moment directions of magnetic domains in the ferrite are all kept in the same direction;
s3, according to the corresponding relation between the preset data string and the writing voltage, the writing voltage corresponding to the data string to be written is applied to the ferrite through the magnetic head, and the magnetic moment direction of each magnetic domain inside the ferrite generates a deflection angle which is uniquely corresponding and is determined by the material characteristics of the ferrite.
In step S1, the current data to be written is first split into a plurality of data strings according to a sequence, each data string includes multi-bit (more than 2 bits) binary data, and the bits of the binary data included in each data string are the same.
Specifically, in this step, the current data to be written may be generally split into a plurality of data strings containing 2-bit binary data according to a sequential order. Thus, the data of 1B can be divided into 4 data strings of 2B, namely each ferrite can record a 2-bit data string, which is theoretically 2 times of the data storage amount of ferromagnetic particles in the prior art.
Furthermore, in this step, the current data to be written may be continuously split into a plurality of data strings containing 4-bit binary data according to the sequence. Thus, the data of 1B can be divided into 2 data strings of 4B, namely each ferrite can record a data string of 4 bits, which is theoretically 4 times of the data storage amount of ferromagnetic particles in the prior art.
In step S2, the ferrite covered on the disc surface is magnetized by the magnetic head, so that the magnetic moment directions of the magnetic domains in the ferrite are all kept in the same direction (generally the same as the magnetic head direction), and the ferrite further shows the magnetism of a specific magnetic pole.
Specifically, in a natural state, the ferrite is a soft magnet, magnetic moment directions of magnetic domains in the ferrite are different, and the ferrite is in a scattered and disordered state, so that the ferrite does not externally show magnetism. The magnetic moment directions of most (or all) magnetic domains are unified to the same direction after the magnetic head applies an external strong magnetic field to the ferrite, so that the ferrite has magnetic poles and externally shows magnetism. Generally, after initial magnetization of the magnetic head, the magnetic moment direction of each magnetic domain remains collinear with the magnetic head, with the N pole of the ferrite facing toward and proximate to the magnetic head and the S pole of the ferrite facing away from and away from the magnetic head.
In step S3, firstly, according to the corresponding relation between the preset data string and the writing voltage, the writing voltage corresponding to each data string after the current data to be written is split is determined in sequence, then the writing voltage corresponding to the current data string to be written is applied to the current ferrite through the magnetic head, at this time, the magnetic moment direction of each magnetic domain in the ferrite is deflected to a certain extent under the influence of the external voltage (or electric field) due to the material characteristics of the ferrite, and the deflection angle of the magnetic moment direction of the magnetic domain is in one-to-one correspondence with the external voltage value applied to the ferrite.
Thus, the different deflection angles of the magnetic moment directions of the magnetic domains in the ferrite represent different writing voltages applied when writing data, and the different writing voltages correspond to different data strings respectively, so that data information is recorded and stored on the disk through the magnetic moment directions of the magnetic domains in the ferrite. Compared with the prior art that each ferrite can only record 1b of data, each ferrite can record a data string containing multi-bit binary data (a plurality of b), so that the data recording and storage capacity can be improved by a plurality of times theoretically, and the data storage capacity of the mechanical hard disk can be improved on the basis of avoiding the increase of the disk scale.
In addition, in order to facilitate the hard disk drive to smoothly read the data stored through the steps, a data reading method is further added in the embodiment, and specifically, the data reading method includes 4 steps, which are respectively:
s4, recognizing the magnetic moment direction of each magnetic domain in the ferrite through the magnetic head and judging the corresponding deflection angle;
s5, converting the identified deflection angle into a corresponding writing voltage according to the corresponding relation between the deflection angle and the writing voltage, which is determined by the material characteristics of the ferrite;
s6, converting the writing voltage into a corresponding data string according to the corresponding relation between the preset data string and the writing voltage;
s7, integrating the data strings into read data in sequence.
The principle of the data reading method is the same as that of the data storage method, basically, the reverse sequence operation is basically performed, and the description is omitted here.
Generally, when a write voltage corresponding to a data string to be written currently is applied to a ferrite through a magnetic head, a corresponding relationship between the data string and the write voltage is defined in advance, or the defined relationship may be adjusted according to actual needs, specifically, the corresponding relationship is v=0.05xk, where K is a decimal integer corresponding to the data string to be written currently. Taking the example that the current data to be written is split into 4 data strings of 2b, if K is 0, the data string is '00', and V=0 at this time, namely the writing voltage is 0 volt; if K is 1, the data string is "01", where v=0.05 volts, i.e., the write voltage is 0.05 volts; if K is 2, the data string is "10", where v=0.10 volts, i.e., the write voltage is 0.10 volts; if K is 3, the data string is "11", where v=0.15 volts, i.e., the write voltage is 0.15 volts.
So configured, if 1B data is to be recorded, 4 ferrites are required to be continuously distributed, each ferrite records two bits of binary data therein, each ferrite is respectively applied with a corresponding writing voltage, and the magnetic moment direction of the internal magnetic domain of each ferrite has a respective deflection angle.
Further, considering that the magnetic moment direction of the magnetic domain in the present ferrite material can only be deflected by several times in pi/4 unit at a time due to the material property influence of ferrite, that is, the deflection angle must be a multiple of 45 °. Thus, if the magnetic moment directions of the magnetic domains are all oriented to the magnetic head at the initial angle, the magnetic moment directions of the magnetic domains are only 8 states in total, and if the data string is four-bit, since the binary data of four bits have 16 combinations, the magnetic moment directions of the magnetic domains with only 8 possible states cannot directly and completely record all four-bit data strings. In this regard, the manner of writing the voltage is improved in the present embodiment.
As shown in fig. 2, fig. 2 is a schematic diagram of the correspondence relationship between the data string, the write voltage and the deflection angle.
Specifically, the 4-bit data string has 16 data combinations from "0000" to "1111", and the integer range corresponding to decimal is 0 to 15. When the data string is within the range of [0000,0111], namely, the corresponding decimal integer range is 0-7, the magnetic head can directly apply a certain writing voltage to a single ferrite according to the corresponding relation between the data string and the writing voltage, if K is 0, the data string is 0000, at the moment, V=0, namely, the writing voltage is 0 volt, and the magnetic moment deflection angle is 0 degrees; if K is 1, the data string is "0001", where v=0.05 volts, i.e., the write voltage is 0.05 volts, and the moment deflection angle is 45 °; if K is 2, the data string is "0010", where v=0.10 volts, i.e., the write voltage is 0.10 volts, and the moment deflection angle is 90 °; if K is 3, the data string is "0011", where v=0.15 volts, i.e., the write voltage is 0.15 volts, and the moment deflection angle is 135 °; if K is 4, the data string is "0100", where v=0.20 volts, i.e., the write voltage is 0.20 volts, and the moment deflection angle is 180 °; if K is 5, the data string is "0101", where v=0.25 volts, i.e., the write voltage is 0.25 volts, and the moment deflection angle is 225 °; if K is 6, the data string is "0110", where v=0.30 volts, i.e., the write voltage is 0.30 volts, and the moment deflection angle is 270 °; if K is 7, the data string is "0111", where v=0.35 volts, i.e., the write voltage is 0.35 volts and the moment deflection angle is 315 °. So arranged, the 8 magnetic moment directions of the magnetic domains can be used for respectively recording the first 8 combined 4-bit data strings.
But when the data string is within the last 8 combinations of [1000,1111], it is necessary to simultaneously perform common recording with two adjacent sets of ferrites, which are integrally read as a whole when reading the data. Specifically, firstly, a difference value obtained by subtracting 8 from a decimal integer corresponding to a data string needs to be calculated, then, a write voltage corresponding to the data string corresponding to the difference value is applied to a first ferrite through a magnetic head, finally, a unique identification voltage is applied to a second ferrite, and the corresponding relation between the identification voltage and the data string is defined in advance in a disk drive: the identification voltage corresponds to the 4-bit data string "1000".
For example, if the 4-bit data string to be recorded is "1100", the decimal integer corresponding to "1100" is first calculated to be 12, the difference value obtained by subtracting 8 from the decimal integer is 4, then the integer 4 is converted into the 4-bit data string to be "0100", and then the writing voltage corresponding to "0100" can be applied to the first ferrite, at this time, K is 4, and the corresponding writing voltage is 0.20 v. And finally, directly applying an identification voltage to the second ferrite, which is equivalent to labeling tag identification on the ferrite, and is expressed as 1000. So configured, the 4-bit data string "1100" is recorded simultaneously by two adjacent sets of ferrites, recorded as "0100" and "1000", respectively.
In the above description, although the 4-bit data string "1100" is recorded by two ferrites at the same time, this does not mean that the data is read directly as "10000100" when the data is read, but it is necessary to perform the integrated processing of two separately recorded 4-bit data strings. Specifically, when integrating each data string into read data in sequence, if the second ferrite of two adjacent ferrites has an identification voltage, that is, if the hard disk drive detects that a certain 4-bit data string is "1000", then the data string corresponding to the first adjacent ferrite needs to be comprehensively read according to the reading sequence, the sum of the two data strings is calculated by adding the data string "1000" and the other data string, and finally the data string corresponding to the summation result is used as the common read data of the two ferrites. For example, if the data string corresponding to the adjacent first ferrite is "0100", the "1000" and "0100" are added to "1100", and the recorded data of the two ferrites as a whole is "1100".
In addition, when the magnetic moment direction of each magnetic domain in the ferrite is identified by the magnetic head and the corresponding deflection angle is determined, the magnetic moment direction of each magnetic domain in the ferrite can be determined specifically by detecting the distance between the magnetic head and the ferrite from the magnetic head to the N pole and the S pole of the ferrite, and the magnetic moment deflection angle of each magnetic domain can be determined in combination with the detection of the magnetic induction intensity of the ferrite by the magnetic head.
As shown in fig. 3, fig. 3 is a system block diagram according to an embodiment of the present invention.
The embodiment also provides a mechanical hard disk data read-write system based on ferromagnetic materials, which mainly comprises a data splitting module 1, an initial magnetization module 2 and a pressurized storage module 3.
The data splitting module 1 is mainly used for sequentially splitting the current data to be written into a plurality of data strings containing multi-bit binary data. The initial magnetization module 2 is mainly used for magnetizing ferrite covered on the surface of the disk through a magnetic head so that the magnetic moment directions of magnetic domains in the ferrite are all kept in the same direction. The pressurized storage module 3 is mainly used for applying a write voltage corresponding to a data string to be written to the ferrite through the magnetic head according to a preset corresponding relation between the data string and the write voltage, and enabling magnetic moment directions of magnetic domains in the ferrite to generate a deflection angle which is uniquely corresponding and is determined by material characteristics of the ferrite.
The mechanical hard disk data reading and writing system based on the ferromagnetic material provided by the embodiment has the same beneficial effects as the mechanical hard disk data reading and writing method based on the ferromagnetic material, and is not repeated here.
In addition, in order to facilitate the hard disk drive to smoothly read the stored data, a magnetic domain identification module 4, a first transformation module 5, a second transformation module 6 and a data integration module 7 are added in the present embodiment.
The magnetic domain identification module 4 is mainly used for identifying the magnetic moment direction of each magnetic domain in the ferrite by the magnetic head and judging the corresponding deflection angle. The first conversion module 5 is mainly used for converting the identified deflection angle into the corresponding writing voltage according to the corresponding relation between the deflection angle and the writing voltage, which is determined by the material characteristics of the ferrite. The second conversion module 6 is mainly configured to convert the writing voltage into a corresponding data string according to a preset correspondence between the data string and the writing voltage. The data integration module 7 is mainly used for sequentially integrating each data string into read data.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A mechanical hard disk data read-write method based on ferromagnetic material is characterized by comprising the following steps:
dividing the current data to be written into a plurality of data strings containing multi-bit binary data in sequence;
magnetizing ferrite covered on the surface of the disk by a magnetic head so that the magnetic moment directions of magnetic domains in the ferrite are all kept in the same direction;
according to the corresponding relation between the preset data string and the writing voltage, the writing voltage corresponding to the current data string to be written is applied to the ferrite through the magnetic head, and the magnetic moment direction of each magnetic domain inside the ferrite generates a deflection angle which is uniquely corresponding and is determined by the material characteristics of the ferrite;
when a write voltage corresponding to a data string to be written currently is applied to the ferrite through the magnetic head:
if the data string is within the range of [0000,0111], the magnetic head applies a write voltage corresponding to the data string to be written currently to the ferrite;
if the data string is in the range of [1000,1111], firstly calculating a difference value obtained by subtracting 8 from a decimal integer corresponding to the data string, then applying a write voltage corresponding to the data string corresponding to the difference value to a first ferrite of two adjacent ferrites through the magnetic head, and applying an identification voltage to a second ferrite; wherein, the corresponding data string of the identification voltage is "1000".
2. The method for reading and writing mechanical hard disk data based on ferromagnetic material according to claim 1, further comprising:
identifying the magnetic moment direction of each magnetic domain in the ferrite through the magnetic head and judging the corresponding deflection angle;
converting the identified deflection angle into a corresponding writing voltage according to the corresponding relation between the deflection angle and the writing voltage, which is determined by the material characteristics of the ferrite;
converting the writing voltage into a corresponding data string according to the corresponding relation between the preset data string and the writing voltage;
each of the data strings is sequentially integrated into read data.
3. The method for reading and writing mechanical hard disk data based on ferromagnetic material according to claim 2, wherein the step of sequentially splitting the data to be written into a plurality of data strings containing a plurality of binary data comprises:
the current data to be written is sequentially split into a number of data strings containing 2-bit binary data.
4. The method for reading and writing mechanical hard disk data based on ferromagnetic material according to claim 2, wherein the step of sequentially splitting the data to be written into a plurality of data strings containing a plurality of binary data comprises:
the current data to be written is sequentially split into a number of data strings containing 4-bit binary data.
5. The method according to claim 4, wherein when a write voltage corresponding to a current data string to be written is applied to the ferrite by the magnetic head, the write voltage is v=0.05xk, where K is a decimal integer corresponding to the current data string to be written.
6. The method according to claim 1, wherein when the data strings are sequentially integrated into the read data, if the second ferrite of the adjacent two ferrites has the identification voltage, the sum of the data string "1000" and the corresponding data string identified by the adjacent first ferrite is taken as the common read data of the adjacent two ferrites.
7. The method for reading and writing mechanical hard disk data based on ferromagnetic material according to claim 6, wherein identifying the magnetic moment direction of each magnetic domain inside the ferrite and determining the corresponding deflection angle by the magnetic head, specifically comprises:
and detecting the N-pole distance and the S-pole distance from the magnetic head to the ferrite through the magnetic head, and judging the magnetic moment deflection angle of each magnetic domain through the magnetic induction intensity of the ferrite.
8. A ferromagnetic material based mechanical hard disk data read-write system, comprising:
the data splitting module is used for sequentially splitting the current data to be written into a plurality of data strings containing multi-bit binary data;
the initial magnetization module is used for magnetizing the ferrite covered on the surface of the disk through the magnetic head so as to keep the magnetic moment directions of magnetic domains in the ferrite in the same direction;
the pressurizing storage module is used for applying a writing voltage corresponding to a current data string to be written to the ferrite through the magnetic head according to the corresponding relation between a preset data string and the writing voltage, and enabling the magnetic moment direction of each magnetic domain inside the ferrite to generate a deflection angle which is uniquely corresponding and is determined by the material characteristics of the ferrite;
wherein the pressurized storage module, when a write voltage corresponding to a data string to be written currently is applied to the ferrite through the magnetic head:
if the data string is in the range of [0000,0111], applying a write voltage corresponding to the data string to be written currently to the ferrite by the magnetic head;
if the data string is in the range of [1000,1111], firstly calculating a difference value obtained by subtracting 8 from a decimal integer corresponding to the data string, then applying a write voltage corresponding to the data string corresponding to the difference value to a first ferrite of two adjacent ferrites through the magnetic head, and applying an identification voltage to a second ferrite; wherein, the corresponding data string of the identification voltage is "1000".
9. The ferromagnetic material based mechanical hard disk data read-write system of claim 8, further comprising:
the magnetic domain identification module is used for identifying the magnetic moment direction of each magnetic domain in the ferrite through the magnetic head and judging the corresponding deflection angle;
the first conversion module is used for converting the identified deflection angle into a corresponding writing voltage according to the corresponding relation between the deflection angle and the writing voltage, which is determined by the material characteristics of the ferrite;
the second conversion module is used for converting the writing voltage into a corresponding data string according to the corresponding relation between the preset data string and the writing voltage;
and the data integration module is used for sequentially integrating the data strings into read data.
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