KR20090120804A - High magnetic field indicator and hard disk drive - Google Patents

Abstract

PURPOSE: A hard disk drive and a high field exposure display device without additional work are provided to easily confirm a magnetic recording media without separating a magnetic recording media. CONSTITUTION: A hard disk drive and a high field exposure display device without additional work include a substrate(301) and a magnetic layer(302). The magnetic layer is recorded in a magnetic pattern in order to include coercive force. The coercive force used for recording or reading information of the magnetic recording media is requested for the deletion of the pattern.

Description

High magnetic field indicator and hard disk drive

The present invention relates to an apparatus for checking whether a magnetic recording medium is an element.

As the use of magnetic recording media used for recording information such as various data, images, voices, and computer programs has become widespread, it is important to irreversibly delete data from magnetic recording media that are no longer used for information security. . The information recorded on the magnetic recording medium can be erased by using a disk format, software, overwriting the storage medium several times, so that original data cannot be found, physical destruction, and degaussing. have. Among these methods, a device using a device applying a strong magnetic field is widely used in consideration of the possibility of recovering information or the economic cost of deleting the information.

However, when using an element device that applies a strong magnetic field to the magnetic recording medium, it is difficult to visually determine whether the magnetic recording medium is elementary, so that a problem occurs in the device function itself of the element device or to classify the elementary magnetic recording medium. There is a problem that the magnetic recording medium which is not elemented by the simple mistake of time and the deliberate manipulation of the crime is leaked to the outside.

The present invention proposes a high magnetic field exposure display device for easily confirming whether or not an element of a magnetic recording medium is displayed.

According to an aspect of the present invention, there is provided a high magnetic field exposure display apparatus for a magnetic recording medium; And a magnetic layer in which a confirmation magnetization pattern formed to have a coercive force greater than or equal to the magnetic field strength required for erasing information on the magnetic recording medium is recorded. Here, the coercive force of more than the magnetic field strength required for the information deletion may be the coercive force of the magnetic field strength or more required for the deletion of the reference pattern used to record or read the information on the magnetic recording medium. The coercive force can be more than 1500 and less than 20000 gauss.

According to an embodiment of the present invention, the high magnetic field exposure display device may further include an adhesive layer for attaching the high magnetic field exposure display device to the outside of the hard disk drive. The high magnetic field exposure display device may further include a thin film including a magnetization pattern developer for observing the identification magnetization pattern. Alternatively, the high magnetic field exposure display device may further include a magnetic viewer for observing the identification magnetization pattern.

According to another aspect of the present invention, a hard disk drive for recording and reading information on a magnetic recording medium includes a magnetic layer on which a magnetic field pattern for confirmation is formed so as to have a coercive force greater than the magnetic field strength required for deleting the information on the magnetic recording medium. The high magnetic field exposure display device is fixedly attached.

According to another aspect of the present invention, there is provided a method for identifying an element of a magnetic recording medium included in a hard disk drive, wherein the identification magnetization is formed to have a coercive force greater than or equal to the magnetic field strength required for erasing information on the magnetic recording medium. Preparing a high magnetic field exposure display device including a magnetic layer having a pattern recorded thereon; Attaching the high magnetic field exposure indicator to a hard disk drive; Demagnetizing the hard disk drive using an element device; And determining whether the hard disk drive is an element using the high magnetic field exposure display device.

According to another aspect of the present invention, there is provided a method for identifying an element of a magnetic recording medium included in a hard disk drive, wherein the identification magnetization is formed to have a coercive force greater than or equal to the magnetic field strength required for erasing information on the magnetic recording medium. Using the device to device a hard disk drive to which the high magnetic field exposure display device including the magnetic layer on which the pattern is recorded is fixedly attached; And determining whether the hard disk drive is an element using the high magnetic field exposure display device.

When the device of the hard disk drive according to the present invention, i.e., the device for displaying the data elements recorded on the magnetic recording medium, can be easily known whether the magnetic recording medium is present, it is possible to reduce the error of the administrator or the device operation of the device. It is possible to prevent accidents in which the non-demagnetized magnetic recording medium is mixed with the demagnetized magnetic recording medium and leaked out due to failure or intentional manipulation of criminals. In addition, it is easy to check whether the magnetic recording medium is demagnetized without having to disassemble the hard disk drive to check whether the magnetic recording medium is an element and to remove the magnetic recording medium.

In addition, according to the hard disk drive to which the high magnetic field exposure display device according to the present invention is fixed, the high magnetic field exposure display device may be hardened in order to check whether the magnetic recording medium is an element in the element device at the time of the element of the magnetic recording medium. Device success after device operation can be easily checked without installing a separate device for placing or attaching to a disk drive, or without administrator intervention.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention. In the following description of the present invention, if it is determined that detailed descriptions of related well-known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

1 is a table showing coercive force according to various types of magnetic recording media used in recent years.

1 shows the coercive force of a magnetic tape and a media disk. All magnetic recording media have coercivity. Coercivity is the strength of the inverse magnetic field that is applied to completely reset the magnetization of a magnetized magnet to zero or one. The unit is oersted or Gaussian. Therefore, when an inverse magnetic field having a coercive force or more is applied to the magnetic recording medium, the magnetization value is completely reset, and existing data recorded on the magnetic recording medium cannot be recovered.

Coercivity increases as the recording density of the disc increases. Therefore, in the future, if a hard disk is developed which further increases the data recording density, it may become larger. For reference, a typical 3.5-inch hard disk drive with 100-300 Gbyte capacity is currently around 5000 gauss.

2 is a view showing the structure of a general hard disk drive.

The hard disk drive includes a spindle motor 201, a disk 202 that is a magnetic recording medium, a magnetic head 203, and an actuator 204 to write or read information on the disk 202. The spindle motor 201 is a device for rotating the disk 202 at a constant speed, and the magnetic head 203 is a device for storing / deleting information or reading stored information by magnetizing / erasing a magnetic material coated on the surface of the disk 202. to be. Actuator 204 is a device for moving magnetic head 203. When the control signal is received from the circuit board under the hard disk drive, the actuator 204 moves the arm to which the magnetic head 203 is attached to a specified position.

In addition to the hard disk drive, various components are sealed in a housing and tightly enclosed so that the disk 202 is protected from external shocks or intrusion of fine dust, so that the disk 202, which is a magnetic recording medium, is separated from the hard disk drive. It is difficult and time-consuming. However, as described above, in order to confirm whether the magnetic recording medium is demagnetized, the magnetic disk must be disassembled to separate the magnetic recording medium, and then the magnetic recording medium has to be determined.

3A to 3D are views illustrating a structure of a high magnetic field exposure display device for indicating whether data recorded on a magnetic recording medium of a hard disk drive according to an embodiment of the present invention is an element.

3A is a front view of a high magnetic field exposure display device according to an exemplary embodiment of the present invention. The high magnetic field exposure display device according to an embodiment of the present invention includes a magnetic layer in which a confirmation magnetization pattern is formed to have a coercive force greater than or equal to the magnetic field strength required for deleting information on the magnetic recording medium. The coercive force above the magnetic field strength required for information deletion may be the coercive force above the magnetic field strength required for deletion of the reference pattern used to record or read information on the magnetic recording medium.

When manufacturing a magnetic recording medium in a manufacturing factory, reference patterns (sectors, tracks, addresses, etc.) for controlling the position of a magnetic head in a track or recording medium are recorded by a large magnetic field provided by a magnetic head in a separate factory. Typically, such a reference pattern uses a larger magnetic field than the magnitude of the magnetic field when recording data, for example, the magnetic field produced by the magnetic head of a general hard disk drive.

5 is a diagram illustrating an example of a hysteresis curve according to magnetic field strength applied to one magnetic recording medium. Referring to FIG. 5, the magnetic recording medium may have a different hysteresis curve depending on the maximum intensity of the applied magnetic field even if it is made of one medium.

Therefore, as a result of performing the device by passing the high magnetic field exposure display device along with the hard disk drive through the device device, the coercive force is sufficiently larger than the coercivity for deleting the reference pattern formed in the recording layer on which the information on the magnetic recording medium is recorded. When the formed confirmation magnetization pattern disappears, it is possible to ensure that the entire data including the reference pattern recorded on the magnetic recording medium of the hard disk drive is deleted.

According to one embodiment of the present invention, the coercivity required to delete data including the reference pattern of the hard disk drive may be 1500 or more and 20000 gauss, and the coercivity may be larger for future development of the hard disk.

Whether or not the confirmation magnetization pattern of the high magnetic field exposure display device disappears can be visually confirmed by applying a ferromagnetic colloid developer to reveal the invisible confirmation magnetization pattern. In addition, whether or not the magnetization pattern for identifying the high magnetic field exposure display device disappears may also be checked using a magnetic viewer. The magnetic viewer is a magnetic dispersion uniformly distributed in a film-like sheet, also known as a magnetic scope. Instead of the magnetic viewer, a magnetic field viewing film may be used, and the high magnetic field exposure display device may be modified in various forms as long as the magnetization pattern can be confirmed.

The identification magnetization pattern may have the form of tracks and sectors like a disk of a general hard disk drive, but may be formed to have any shape. For example, as illustrated in FIG. 3A, the identification magnetization pattern may be “degaussing all data is not yet processed” to determine whether the device is high after the high magnetic field exposure display device passes through the device device. It can be formed of letters. This character is formed into a font large enough to be seen by the naked eye, for example, 12 fonts.

Therefore, when the high magnetic field exposure display device along with the hard disk drive passes through the device device and the developer is applied to the high magnetic field exposure display device to check whether the device is present, or when viewed through the magnetic viewer, a character such as "device incomplete" is displayed. If it appears, you can immediately confirm that the device is not available.

Further, this pattern can be formed in association with a reference pattern such as a string such as "Coercivity of Confirmation Magnetization Pattern = ?????? Since the reference pattern is preferably left even when a large magnetic field is applied through the device, the reference pattern may be formed so as not to disappear even when a magnetic field is applied to the substrate 301.

3B is a cross-sectional view of the high magnetic field exposure display device according to the exemplary embodiment of the present invention. The high magnetic field exposure display device according to an exemplary embodiment of the present invention may include a substrate 301 and a magnetic layer 302 including a magnetic material. The magnetic layer 302 includes a confirmation magnetization pattern formed to have a coercive force or higher than the magnetic field strength required for deleting information on the magnetic recording medium included in the hard disk drive. The substrate 301 is not limited to a material or a shape as long as the magnetic layer 302 such as metal, glass, or plastic can be formed.

The display device may further include an adhesive layer (not shown) for attaching the high magnetic field exposure display device to the outside of the hard disk drive. The adhesive layer is not limited to the type or shape as long as it can be attached to the outside of the hard disk drive. Therefore, the high magnetic field exposure display device can be easily attached to the hard disk drive using the adhesive layer before the hard disk drive passes through the device device.

3C is a cross-sectional view of the high magnetic field exposure display device according to another exemplary embodiment of the present invention. The high magnetic field exposure display device according to an exemplary embodiment of the present invention may further include a thin film 303 including a substrate 301, a magnetic layer 302, and a magnetization pattern developer for observing a confirmation magnetization pattern. .

After the high magnetic field exposure display device as shown in FIG. 3C passes through the device device, the thin film 303 may be formed by bursting the thin film 303 including the magnetization pattern developer without having to apply a developer to check whether the device is present. It can be confirmed whether the developer flowed out from the magnetization pattern.

3D is a cross-sectional view of a high magnetic field exposure display device according to still another embodiment of the present invention. The high magnetic field exposure display device according to an exemplary embodiment of the present invention may further include a substrate 301, a magnetic layer 302, and a magnetic viewer 304 for observing a magnetization pattern for confirmation.

When the high magnetic field exposure display device as shown in FIG. 3D is passed through the device device together with the hard disk drive, the identification magnetization pattern disappears through the magnetic viewer 304 formed on the high magnetic field exposure display device passing through the device device. It's easy to see if it's lost, and as a result, it's easy to see if the disks in your hard disk drive are on the device.

That is, according to an embodiment of the present invention, an element together with a hard disk drive that is intended to be placed on or attached to a device by the operator of the device device or the high magnetic field exposure display device of the device device before being placed in the device device. By passing through the device, it is possible to check whether the disk included in the hard disk drive is elementary. In this way, it is possible to prevent the hard disk drive not being leaked out due to a mistake of the administrator or a failure of the device operation of the device device.

4A to 4C are diagrams illustrating a hard disk drive including a high magnetic field exposure display device according to an exemplary embodiment of the present invention.

4A to 4C show side, front, and back views of the hard disk drive 400 to which the high magnetic field exposure display device 401 is attached, respectively. The hard disk drive 400 may be manufactured by attaching the high magnetic field exposure display device 401 to at least one of the front and rear surfaces of the hard disk drive. The high magnetic field exposure display device 401 may be fixedly attached to the hard disk drive so that the hard disk drive 400 may be scratched or partially damaged when it is forcibly removed.

A high magnetic field comprising a magnetic layer including a substrate and a magnetic layer on which a confirmation magnetization pattern is formed so as to have a coercive force of at least a magnetic field strength required for erasing information on the magnetic recording medium in order to check whether the magnetic recording medium is included in the hard disk drive. After fixing the hard disk drive having the exposure display device fixed thereto using an element device, the high magnetic field exposure display device may determine whether the hard disk drive is an element.

Therefore, since the high magnetic field exposure display device is fixedly attached to the hard disk drive and passes through the device equipment, only the high magnetic field exposure display device is exposed to the high magnetic field and then attached to the hard disk drive without passing through the device. It also prevents the risk of deliberate leakage of data recorded in.

Such a hard disk drive including a high magnetic field exposure display device and a high magnetic field exposure display device is useful because it is manufactured in consideration of the situation when the magnetic recording medium is disposed in a place where security-critical information such as medical institutions, government agencies, and financial companies are handled. Can be used.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

1 is a table showing the coercive force of various magnetic recording media used in recent years,

2 is a view showing the structure of a typical hard disk drive,

3A to 3D are diagrams illustrating a structure of a high magnetic field exposure display device for indicating whether data recorded on a magnetic recording medium of a hard disk drive is in accordance with an embodiment of the present invention;

4A to 4C are views illustrating a hard disk drive including a high magnetic field exposure display device according to an embodiment of the present invention.

5 is a diagram illustrating an example of a hysteresis curve according to magnetic field strength applied to one magnetic recording medium.

Claims (16)

A high magnetic field exposure display device of a magnetic recording medium, Board; And And a magnetic layer in which a confirmation magnetization pattern is formed to have a coercive force greater than a magnetic field strength required for erasing information on the magnetic recording medium. The method of claim 1, The coercive force of at least the magnetic field strength required for deleting the information is the coercive force at least the magnetic field strength required for deleting the reference pattern used to record or read the information on the magnetic recording medium. The method of claim 2, And said coercive force is from 1500 to 20000 gauss. The method of claim 1, And a bonding layer for attaching the high magnetic field exposure display device to an outside of the hard disk drive. The method of claim 1, And a thin film including a magnetization pattern developer for observing the identification magnetization pattern. The method of claim 1, And a magnetic viewer or a magnetic viewing film for observing the identification magnetization pattern. A hard disk drive for recording and reading information on a magnetic recording medium, And a magnetic layer having a magnetic layer on which a confirmation magnetization pattern formed to have a coercive force greater than a magnetic field strength required for erasing information on the magnetic recording medium is recorded. The method of claim 7, wherein And a coercive force of at least the magnetic field strength required for deleting the information is a coercive force at least the magnetic field strength required for deleting the reference pattern used to record or read information on the magnetic recording medium. The method of claim 8, And said coercive force is at least 1500 and not more than 20000 gauss. The method of claim 7, wherein The high magnetic field exposure display device further comprises a thin film including a magnetization pattern developer for observing the identification magnetization pattern. The method of claim 7, wherein The high magnetic field exposure display device further comprises a magnetic viewer or a magnetic viewing film for observing the identification magnetization pattern. As a method for determining whether a magnetic recording medium included in a hard disk drive is an element, Preparing a high magnetic field exposure display device comprising a substrate and a magnetic layer on which a magnetic layer for identification formed to have a coercive force greater than a magnetic field strength required for erasing information on the magnetic recording medium is recorded; Attaching the high magnetic field exposure indicator to a hard disk drive; Demagnetizing the hard disk drive using an element device; And And determining whether the hard disk drive is an element using the high magnetic field exposure display device. The method of claim 12, The high magnetic field exposure display device further comprises an adhesive layer for attaching to the outside of the hard disk drive, Attaching to the hard disk drive, wherein the adhesive layer is used. The method of claim 12, The high magnetic field exposure display device further includes a thin film including a magnetization pattern developer for observing the identification magnetization pattern, In the step of confirming whether the device, characterized in that for identifying the device with the magnetization pattern developer flowed out of the thin film. The method of claim 12, Further comprising a magnetic viewer or a magnetic viewing film for observing the identification magnetization pattern, In the step of determining whether the device, characterized in that the device using the magnetic viewer or magnetic viewing film to determine whether the device. As a method for determining whether a magnetic recording medium included in a hard disk drive is an element, A hard disk drive having a high magnetic field exposure display device fixed thereto including a substrate and a magnetic layer on which a magnetic field for identification is formed to have a coercive force greater than the magnetic field strength required for erasing information on the magnetic recording medium, is fixed. Making; And And determining whether the hard disk drive is an element using the high magnetic field exposure display device.

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