JP2001143252A - Magnetic recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a need of tracking control at each time of movement on a recording track. SOLUTION: A recording track T1 formed by vapor deposition of a spiral magnetic body is formed on the front face of a magnetic recording medium, and a recording track T0 which is spiral in the same direction as the recording track T1 on the front face is formed on the rear face as shown by a dotted line. These recording tracks are separated by a guard band made of a nonmagnetic body to reduce the crosstalk penetrating from adjacent tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium capable of storing and reading a large amount of data.

[0002]

2. Description of the Related Art A disk pack in which one or more hard magnetic disks (magnetic recording media) are stacked in a stack is rotated, and a plurality of pairs of magnetic heads are brought into contact with the front or back surface of each of these hard magnetic disks. A hard magnetic disk drive using a hard magnetic disk for recording or reading data is used as an external storage device of a computer for backing up a large amount of data.

FIG. 4 (a) shows recording tracks of one hard magnetic disk employed in such a hard magnetic disk device.
Concentric recording tracks T ₁₁ ,
T _12, T ₁₃ ··· are formed. The recording area of each of these tracks is divided in the circumferential direction, and the address management of the recording data is performed by the sector mark added to each of the divided sectors S.

[0004] When recording data on such hard magnetic disks, e.g., FIG. 4 (b) track T ₁₁ in the data storage surface [1 surface] As shown in A-A line cross-sectional enlarged view of the is, then the data in the track T _01, which are located on the same radius of the rear surface [0 surface] is recorded. Below [1
While the track T _12, T ₀₂ are on the same cylinder surface] and [0 plane], T _13, T ₀₃ · · · are alternately selected, the magnetic head on the inner circumference (periphery) side from the outer periphery (inner periphery) Is stepped and data is recorded.

[0005]

However, if the width of the recording track is further reduced and the recording density is increased in such a hard magnetic disk, the S / N is degraded due to crosstalk from an adjacent track.

Therefore, as shown in the sectional view of the hard magnetic disk shown in FIG. 5, a guard band G where no data is recorded is provided between the recording tracks T ₁₁ and T ₁₂ on one surface.
High pitch (5
μm) separated magnetic recording track disk (discrete media) has been developed.

However, a hard magnetic disk having such a high-precision track pitch has recording tracks T ₀₁ , T ₀₂ , T ₀₃ on the back side with respect to recording tracks T ₁₁ , T ₁₂ , T _13. It is extremely difficult to form the positions of... Completely on the same radius.

When such a high-pitch track hard magnetic disk is fixed to a rotating shaft as two or more disk packs, eccentricity of at least several μm occurs mutually.

Therefore, as described above, when data is recorded on the hard magnetic disk, concentric recording tracks T ₁₁ , T ₁₂ , T ₁₃ ... Of [1 plane] and concentric recording of [0 plane] are recorded. When the recording operation is performed while alternately selecting the tracks T ₀₁ , T ₀₂ , T ₀₃ ... (Cylinder management), each time the recording track is moved, the track is accessed on the first side and the zero side. There is a problem that the tracking control is required and the access time becomes long.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic recording medium which can reduce such a problem. The recording tracks of the magnetic recording medium can be formed on both the front surface and the back surface. When recording a continuous series of data formed in a spiral shape that is in the same direction when viewed from the surface direction, for example, from the inner peripheral side to the outer peripheral side of the spiral recording track formed on one surface After the data is recorded on the recording track on one side, the recording track on the other side is selected, and for example, the data is recorded from the outer periphery to the inner periphery of this surface. Is controlled to be recorded.

In a hard magnetic disk drive using the magnetic recording medium of the present invention, one or two or more magnetic recording media of the present invention in which spiral recording tracks are previously formed on the front and rear surfaces are rotated. Drive means, magnetic head means for moving in the radial direction in contact with the front and back surfaces of the magnetic recording medium to record or reproduce data, and tracking for controlling the magnetic head means to scan a desired recording track Means, and a control means such that a series of recording data is continuously recorded on a spiral track on any one surface of the magnetic recording medium, so that a conventional magnetic recording medium is used. It is possible to have an access time earlier than that of the hard magnetic disk device.

In the magnetic recording medium of the present invention, separate spiral recording tracks having guard bands are formed on the front and back surfaces of the magnetic recording medium in advance. The recording can be performed continuously from one surface along the line. When performing tracking control on the front surface and the back surface, the configuration is such that the spiral of the recording track is the same when viewed from the front surface direction, so that only the eccentric component needs to be given as the correction amount. The access speed at the time can be increased, and the control of accessing the track is required only when the data moves to a different plane, so that it is not necessary to access the track for each conventional one track.

According to a first aspect of the present invention, spiral recording tracks are formed on both front and rear surfaces so as to be in the same direction as viewed from the front, and the recording tracks are separated by guard bands. A magnetic recording medium characterized by the following.

According to a second aspect of the present invention, data is recorded on the recording track from an inner peripheral side of one surface which is a front surface to an outer peripheral side, and then from an outer peripheral side of the other surface which is a back surface. When the continuous recording of data is switched to the other side, which is the back side, after the data is continuously recorded on one side, which is the front side, the data is continuously and continuously made on the inner peripheral side. 4. A tracking control corresponding to a mutual eccentric component of a recording track on one surface to be recorded and a recording track on the other surface which is a back surface is performed. Is sequentially and continuously recorded from the outer peripheral side to the inner peripheral side of one surface which is the front side, and then from the inner peripheral side to the outer peripheral side of the other surface which is the rear side. After data is continuously recorded on one side, When the continuous recording of data is switched to the surface, the tracking control corresponding to the mutual eccentric component of the recording track of one surface, which is the front surface, and the recording track of the other surface, which is the back surface, is performed. This is a magnetic recording medium characterized by being read.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 is shows the track Huo mat formed on the surface of the magnetic recording medium of the present invention, for example the recording track T ₁ with a deposit of magnetic material and spiral tracks Have been. Further, the recording track T ₁ and the recording track T _0, which is a spiral in the same direction of the surface as viewed from the front direction as shown by the dotted line on the reverse side is formed.

Each of these recording tracks T ₁ and T ₀ is separated by a guard band made of a non-magnetic material so as to reduce crosstalk mixed from an adjacent track and divided into appropriate sectors. Address management.

One or more of such magnetic recording media 10 are fixed to a rotating shaft 11 as shown in FIG.
The rotating shaft 11 is driven in one direction by a driving means including a high-speed rotating motor (not shown).

In FIG. 2, reference numeral 12 denotes a carriage which is configured to move in the radial direction of the magnetic recording medium by a linear motor 13. The carriage 12 contacts the front and back surfaces of the magnetic recording medium 10 with the carriage 12.
The pair of magnetic heads 14A and 14B
Move between the inner circumference and the outer circumference. Then, tracking control is performed so as to be located on a desired recording track.

As is well known, the pair of magnetic heads 14A and 14B are flying heads, and are arranged on the carriage 12 in a number corresponding to the number of magnetic recording media to be stacked. For example, an error signal is detected by detecting tracking information formed on the magnetic track, and tracking servo is applied by the error signal.

FIG. 3 shows a pair of magnetic heads 14A for recording / reproducing data on the front and back surfaces of the magnetic recording medium 10,
14B, a head 15A for detecting tracking information,
15B shows a simple block diagram of a hard magnetic disk device provided with a hard disk drive 15B, wherein S _RW is a switch for switching in a data recording / reproducing mode, and S _CH is a magnetic head for a magnetic head in contact with the front and back surfaces of a magnetic recording medium. 3 shows a changeover switch. 1
Reference numeral 6 denotes a signal processing circuit for recording data, and reference numeral 17 denotes a signal processing circuit for read data, which are controlled by a control unit 18 of the hard magnetic disk drive.

The tracking information on the front and back surfaces of the magnetic recording medium 10 obtained from the magnetic heads 15A and 15B is as follows:
The tracking error is supplied to the error detection unit 19 and a tracking error is generated. The tracking error is supplied to a tracking means 20 including a tracking servo circuit, a track jump circuit, and the like, and controls a pair of magnetic heads to access a desired recording track on the front surface or the back surface.

As described above, the hard magnetic disk device uses the magnetic recording medium 10 of the present invention in which recording tracks formed in a spiral shape are formed on the front and back surfaces. When data is recorded on the magnetic recording medium 10, the data is continuously recorded along a spiral recording track formed on one surface of the magnetic recording medium 10, and the data is recorded on the one surface. After that, switching is performed so that recording data is supplied to the magnetic head in contact with the other surface. At the time of this switching, tracking control corresponding to the eccentric component of the disk is performed.

When the hard magnetic disk drive 10 is constituted by stacking two or more magnetic recording media, the second magnetic recording medium 10 The first magnetic recording medium 10 is selected, and data is written in a sequence similar to that of the first magnetic recording medium 10.

Therefore, even when the center points of the recording tracks T formed on the front and rear surfaces of the magnetic recording medium 10 do not completely coincide with each other, a special access operation is performed when data is continuously recorded. Is unnecessary, and the recording operation (or reproduction operation) speed is increased. Then, the access control of the magnetic head is performed only when the recording data is switched from the front surface (or the back surface) to the back surface (the front surface).

That is, since the operation of accessing each track is not necessary as in the cylinder management system employed when writing data on concentric recording tracks as in the prior art, the data recording / reproducing speed is reduced. Get higher. In particular, when performing a data stream-like operation of writing and reading a series of data, the access time can be considerably reduced.

Although one magnetic recording medium has been described in the above embodiment, similar control can be performed by increasing the number of magnetic heads and switch circuits even when two or more magnetic recording media are used. it can.

[0027]

As described above, the magnetic recording medium of the present invention includes a magnetic recording medium having spiral recording tracks formed on the front and rear surfaces in the same direction, and tracking the spiral recording tracks on both sides. Since a series of data is recorded or reproduced while being tracked by the magnetic head to be detected, the access time is considerably increased especially when performing a data stream-like operation such as writing and reading a series of data. Can be shortened. Even when the recording track positions on the front and back surfaces of the magnetic recording medium are displaced from each other, track access may be performed based on slight tracking correction corresponding to eccentricity only when moving from one surface to the other surface. Access time can be reduced. Further, since the accuracy of the track deviation between the front and back surfaces of the magnetic recording medium is reduced, there is an advantage that the specifications of the magnetic recording medium are loosened and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic recording medium according to the present invention.

FIG. 2 is a schematic diagram of a hard magnetic disk drive using the magnetic recording medium of the present invention.

FIG. 3 is a block diagram of a hard magnetic disk drive using the magnetic recording medium of the present invention.

FIG. 4 is a plan view of a conventional hard magnetic disk.

FIG. 5 is a cross-sectional view of a separation track type magnetic track.

[Explanation of symbols]

10: magnetic recording medium; 12: carriage; 13: linear motor; 14A, 14B: magnetic head.

Claims (3)

[Claims] 1. A magnetic recording medium, wherein spiral recording tracks are formed on both front and rear surfaces so as to be in the same direction as viewed from the front, and the recording tracks are separated by guard bands. . 2. Recording of data on the recording track is as follows:
Data is sequentially and continuously formed from the inner peripheral side to the outer peripheral side of one surface which is regarded as the front surface, and then from the outer peripheral side to the inner peripheral side of the other surface which is regarded as the back surface. After continuous recording, when continuous recording of data is switched to the other surface which is the back surface, the recording track of one surface which is the front surface and the recording track of the other surface which is the back surface 2. The magnetic recording medium according to claim 1, wherein tracking control corresponding to the mutual center eccentric components is performed. 3. The recording of data on the recording track,
Data is sequentially and continuously formed from the outer side to the inner side of one surface, which is the front side, and then from the inner side to the outer side, on the other side which is the back side. After continuous recording, when continuous recording of data is switched to the other surface which is the back surface, the recording track of one surface which is the front surface and the recording track of the other surface which is the back surface 2. The magnetic recording medium according to claim 1, wherein tracking control corresponding to the mutual center eccentric components is performed.