KR20060096582A - Information storing media, method and apparatus for recording/reproducing the same - Google Patents

Abstract

Disclosed are an information storage medium, a recording / reproducing method thereof, and an apparatus for providing a high quality reproduction signal by reducing crosstalk by adjacent tracks when a high capacity information storage medium is reproduced.

The information storage medium according to the present invention includes a substrate and first and second grooves alternately formed on the substrate, wherein the depths of the first groove and the second groove are different from each other.

According to the present invention, crosstalk in which the quality of a playback signal is degraded by adjacent tracks during playback can be reduced. In addition, according to the present invention, even when the track pitch is decreased for increasing the recording density, crosstalk by adjacent tracks can be reduced.

Description

Information storing media, method and apparatus for recording / reproducing the same

1A and 1B schematically illustrate an information storage medium used for simulating a heat distribution according to a change in depth of a groove in an information storage medium according to the present invention.

2A and 2B are graphs showing the intensity distribution of beam spots formed around the groove when the x-polarized reproduction beam is incident in a direction perpendicular to the x-z plane of the information storage medium of FIGS. 1A and 1B, respectively.

3A and 3B are graphs showing a heat distribution on an x-z plane formed around the groove when an x polarized reproduction beam is incident on the information storage medium of FIGS. 1A and 1B, respectively.

4A and 4B are graphs showing the heat distribution of FIGS. 3A and 3B, respectively, as contour lines.

5 is a graph showing the intensity of a beam formed on a plane in a depth direction of the information storage medium when the x-polarized reproduction beam is incident on the information storage medium according to the present invention.

6A and 6B are graphs showing intensity distributions of beam spots formed around the grooves when z-polarized reproduction beams are incident in a direction perpendicular to the x-z plane of the information storage medium of FIGS. 1A and 1B, respectively.

7A and 7B are graphs showing a heat distribution on an x-z plane formed around the groove when a z-polarized reproduction beam is incident on the information storage medium of FIGS. 1A and 1B, respectively.

8A and 8B are graphs showing the heat distribution of FIGS. 7A and 7B as contour lines, respectively.

9 is a graph showing the intensity of a beam formed on a plane in the depth direction of the information storage medium when a z-polarized reproduction beam is incident on the information storage medium according to the present invention.

10 is a graph showing a beam intensity distribution formed on an x-y plane when a circularly polarized reproduction beam is irradiated according to a depth of a groove formed in an information storage medium according to the present invention.

11 is a plan view schematically showing an information storage medium according to the present invention;

12 is a cross-sectional view showing the configuration of an information storage medium according to the present invention of FIG.

13 is a block diagram schematically showing an apparatus for recording / reproducing an information storage medium according to the present invention;

14 is a flowchart illustrating a method of reproducing an information storage medium according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information storage medium, and more particularly, to an information storage medium for providing a high quality reproduction signal by reducing crosstalk by adjacent tracks when a high capacity information storage medium is reproduced, and a recording / reproducing method and apparatus thereof. .

Recently, due to the development of the computer-related industry, the demand for new information storage media with greater storage capacity is increasing. As a method of increasing the recording capacity of such an information storage medium, there is a method of shortening the wavelength of the recording light source, increasing the numerical aperture of the objective lens, or configuring a plurality of recording layers. Another method of increasing the recording capacity is to reduce the pit size or reduce the track pitch. For example, a Blu-ray disc currently commercially available has a track pitch of 0.32 μm, a recording capacity of 25 GB, and a shortest recording mark of 150 nm. In theory, the shortest recording mark is 1/4 of 25 GB. When reduced to 37.5nm, a storage capacity of 100GB can be achieved.

On the other hand, as an information storage medium for increasing the recording capacity, an information storage medium having a super-resolution near-field structure (Super-RENS) has been studied. The information storage medium using the super-resolution near-field structure overcomes λ / 4NA (λ: wavelength of light source, NA: numerical aperture of objective lens), which is the limit of the resolution of the reproduction beam, and records as a small mark (or pit) below resolution Refers to an information storage medium capable of reproducing predetermined data.

However, in a high-density information storage medium such as a super-resolution near-field structure, the playback signal tends to be degraded by mutual interference between tracks by reducing the track pitch to improve recording density. Therefore, the higher the density of information storage media, the greater the need to eliminate interference signals by adjacent tracks when detecting playback signals.

In this way, the extent of signal degradation by adjacent tracks when the information storage medium is reproduced is defined as crosstalk between tracks. The crosstalk must have a size less than or equal to a predetermined value in order to provide a reproduction signal of a certain quality or more. For example, in the case of a ROM disk, a crosstalk value of -30 dB or less is required to obtain a good playback signal. In addition, the DVD-ROM uses an objective lens with a numerical aperture (NA) of 0.6 and a light source having a wavelength of λ of 650 nm for recording / reproducing, and has a track pitch of 0.74 탆 and a capacity of 4.7 GB. λ / NA is 1.08 and the condensation spot ratio with respect to the track pitch Tp is Tp × λ / NA = 0.68 so that the crosstalk of adjacent tracks is -30 dB or less.

In case of reducing the track pitch in order to increase the recording density of the information storage medium, such as a super-resolution near field structure information storage medium which is expected to be used as a high density information storage medium in the future, the crosstalk is an important factor that determines the quality of the reproduction signal. To be an element. Therefore, it is necessary to reduce crosstalk by adjacent tracks as much as possible in a high density information storage medium.

Accordingly, an object of the present invention is to provide an information storage medium, a recording / reproducing method and apparatus for reducing crosstalk between adjacent tracks.

It is also an object of the present invention to provide an information storage medium, a recording / reproducing method and apparatus for reducing crosstalk caused by adjacent tracks even when the track pitch is reduced for increasing the recording density.

In order to solve the above technical problem, the information storage medium according to the present invention is a substrate; And a first groove and a second groove alternately formed on the substrate, wherein the depths of the first groove and the second groove are different from each other.

An apparatus for recording / reproducing an information storage medium including grooves alternately formed on the substrate according to the present invention and having grooves having different depths, irradiates the information storage medium with a beam of predetermined power and detects light reflected from the medium. And a control unit controlling a power of a beam irradiated from the pickup unit according to a depth of a groove formed in the information storage medium.

In a method of recording / reproducing an information storage medium including grooves alternately formed on a substrate according to the present invention and having grooves having different depths, the power of the beam irradiated from the pickup is varied depending on the depth of the groove formed on the medium. Irradiating the beam; And detecting light reflected from the medium by irradiation of the beam.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the information storage medium according to the present invention, a heat distribution formed on the groove by irradiation of a reproduction beam according to the depth change of the groove will be described.

1A and 1B schematically illustrate an information storage medium used for simulating a heat distribution according to a depth change of a groove in an information storage medium according to the present invention. For convenience of description, the depth direction of the information storage medium is set to the y axis, the track direction is z-axis, and the direction perpendicular to the track from the center of the information storage medium is set to the x axis.

The groove G formed in the information storage medium of FIG. 1A has a depth of 25 nm, and the groove G of the information storage medium of FIG. 1B has a depth of 50 nm. A circular polarized signal was irradiated to the information storage medium and then irradiated with a x polarized reproduction beam and a z polarized reproduction beam, respectively, to simulate the intensity distribution and the heat distribution of the beam spot formed around the groove. Here, the power of the reproduction beam was set to 2.0 mW.

2A and 2B are graphs showing the intensity distribution of beam spots formed around the grooves when the x-polarized reproduction beam is incident in the direction perpendicular to the plane of the information storage medium of FIGS. 1A and 1B, that is, the xz plane. to be. 2A and 2B show intensity distributions of beam spots viewed from above of the information storage medium, that is, viewed from the x-z plane.

Referring to FIG. 2A, in the information storage medium of FIG. 1A having a groove depth of 25 nm when the x-polarized reproduction beam is incident, the beam spot is not concentrated on the grooved track and spreads laterally. On the contrary, referring to FIG. 2B, in the information storage medium of FIG. 1B having a groove depth of 50 nm, the beam spot is concentrated on the grooved track.

3A and 3B are graphs showing the heat distribution on the xz plane formed around the groove when the x polarized reproduction beam is incident on the information storage medium of FIGS. 1A and 1B, respectively. FIGS. 4A and 4B are FIGS. 3A and 4B, respectively. It is a graph which shows the heat distribution of FIG. 3B by contour.

3A to 4B, the center where the reproduction beam is incident has the highest temperature regardless of the depth of the groove, and the temperature gradually decreases toward the periphery. By the way, when the groove depth is 25nm, the maximum temperature is 355 ° C, while when the groove depth is 50nm, the maximum temperature is 385 ° C. Therefore, it can be seen that the deeper the groove is, the higher the temperature of the center portion is compared with the lower depth.

5 is a graph showing the intensity of a beam formed on the depth direction of the information storage medium, that is, the x-y plane when the x-polarized reproduction beam is incident on the information storage medium. Referring to FIG. 5, it can be seen that the beam intensity 20 when the depth is 50 nm is larger than the beam intensity 10 when the thickness is 25 nm.

Next, the result of the simulation using the z-polarized reproduction beam will be described.

6A and 6B illustrate intensity distributions of beam spots formed around the grooves when z-polarized reproduction beams are incident in a direction perpendicular to the plane of the information storage medium of FIGS. 1A and 1B, that is, the xz plane. It is a graph. 6A and 6B, it may be confirmed that the intensity of the reproducing beam is concentrated toward the groove when the x-polarized reproducing beam is not clear but has a deeper groove depth.

7A and 7B are graphs showing the heat distribution on the xz plane formed around the groove when the z-polarized reproduction beam is incident on the information storage medium of FIGS. 1A and 1B, respectively. FIGS. 8A and 8B are FIGS. The heat distribution of FIG. 7B is a graph showing contours.

 Referring to FIGS. 7A to 8B, when the depth of the groove is 25 nm, the maximum temperature is 372 ° C., whereas when the groove depth is 50 nm, the maximum temperature is 391 ° C., and the deeper the groove is, the higher the temperature is. It can be seen that.

9 is a graph showing the intensity of a beam formed on a depth direction of the information storage medium, that is, an x-y plane when a z-polarized reproduction beam is incident on the information storage medium. Referring to FIG. 9, it can be seen that the beam intensity 40 when the depth is 50 nm is larger than the beam intensity 30 when the thickness is 25 nm.

10 is a graph showing a beam intensity distribution formed on an x-y plane when a circularly polarized reproduction beam is irradiated according to a depth of a groove formed in an information storage medium according to the present invention. The circularly polarized regenerated beam is a sum of x-polarized and z-polarized regenerated beams, and the graph of FIG. 10 is the same as the sum of the graphs of FIGS. 5 and 9.

Referring to FIG. 10, in the case of beam intensity 60 formed in a groove having a depth of 50 nm by irradiation of an actual reproducing beam which is circularly polarized light, both edges of the track have the greatest intensity around the groove. In addition, in the case of beam intensity 50 formed around a groove having a depth of 25 nm, it has the greatest intensity at the center of the groove. However, even in this case, it can be seen that the beam intensity formed in the groove having a depth of 50 nm is larger than the beam intensity formed around the groove having a depth of 25 nm.

In summary, simulation results show that the deeper grooves in the information storage medium, the more the regenerated beams are concentrated on the grooves, so that the deeper grooves tend to have higher beam intensities, which tends to increase the temperature. Able to know.

Therefore, the information storage medium according to the present invention is formed sequentially by varying the depth of the groove in which the predetermined data is recorded based on the simulation result, and by using a super resolution method for the grooves having a larger depth among the grooves. Is recorded, and predetermined grooves are recorded in a groove having a smaller depth by using a non-super resolution method.

11 is a plan view schematically showing an information storage medium according to the present invention. In the information storage medium according to the present invention, it is assumed that predetermined data to be reproduced is recorded on a groove made of a groove provided in a spiral shape on a disk surface.

The information storage medium according to the present invention includes a first groove G1 and a second groove G2 alternately formed toward the outer circumferential side of the disc. That is, the first groove G1 and the second groove G2 having different depths are formed sequentially from the center of the disc toward the outer circumferential side in the manner of G1, G2, G1, G2, .... Here, the first groove G1 and the second groove G2 are divided according to their depths, and the first groove G1 and the second groove G2 have different depths.

Among the grooves having different depths, a predetermined recording mark is formed in a groove having a larger depth using a super resolution method, and a predetermined recording mark using a non-super resolution method is formed in a groove having a smaller depth. . For example, a predetermined recording mark may be formed on the groove having a smaller depth by a DVD, HD-DVD, Blu-ray disc method, or the like.

In general, when reproducing a recording mark using a super resolution near field structure, a reproducing beam of higher power is required than a reproducing beam used in an information storage medium having a non-super resolution structure. Therefore, when irradiating a relatively high power reproduction beam to reproduce data recorded in a super resolution method on the groove having a larger depth, a non-super resolution method that requires precise optical characteristics is required for adjacent grooves. Since data is recorded, crosstalk is reduced because of differences in the reproduction method. In addition, in the case of irradiating a relatively low power reproduction beam to reproduce the data recorded in the non-super resolution method, the super resolution data is formed on the groove having a larger depth so that the temperature is relatively higher. Although raised, the reproduction beam irradiated upon reproduction of the data recorded in the non-super resolution method does not have sufficient power to cause the super resolution effect. Therefore, even when the non-super resolution data is reproduced, the crosstalk by the groove in which predetermined data is recorded in the super resolution method is reduced.

12 is a cross-sectional view showing the configuration of the information storage medium according to the present invention of FIG. 12 shows a cross section perpendicular to the track of the information storage medium.

Referring to FIG. 12, an information storage medium according to the present invention includes a substrate 100, a first dielectric layer 105, a first recording auxiliary layer 110, and a second dielectric layer sequentially formed on the substrate 100. 115, a recording layer 120, a third dielectric layer 125, a second recording auxiliary layer 130, and a fourth dielectric layer 135. Here, the first to fourth dielectric layers 105, 115, 125, and 135 are layers that serve as heat sinks, and are not essential components, and information may be reproduced even when these layers are not present. In addition, the first and second recording auxiliary layers 110 and 130 are layers to assist the recording of recording marks with respect to the recording layer 120. In addition, the information storage medium according to the present invention preferably protects the layers formed on the substrate 100 on the fourth dielectric layer 135, and further includes a cover layer 140 through which the incident beam is transmitted.

The substrate 100 is made of any one material selected from polycarbonate, polymethyl methacrylate (PMMA), amorphous polyolefin (APO), and glass materials. In addition, as described above, as a characteristic part of the information storage medium according to the present invention, the substrate 100 is formed such that grooves G1 and G2 having different depths sequentially intersect. For example, the depth d ₁ of the groove G1 having a lower depth may be 25 nm, and the depth d ₂ of the groove G2 having a larger depth may be 50 nm. In addition, a predetermined depth is recorded in the groove G2 having a larger depth by using a super-resolution near field structure, and a data recording method other than the super-resolution near-field structure is used in the groove G1 having a lower depth. Record predetermined data.

The first to fourth dielectric layers 105, 115, 125, and 135 serve as heat sinks, and zinc sulfide-silicon dioxide compounds (ZnS-SiO ₂ ), silicon oxide (SiO _X ), and silicon nitride (SiN _X ) and the like.

The first and second recording auxiliary layers 110 and 130 may be made of germanium-antimony-terryllium (Ge-Sb-Te) or silver-indium-antimony-terryllium (Ag-In-Sb-Te). It is composed. Here, the first and second phase change layers 110 and 130 are not limited to those shown and only one of the two recording auxiliary layers may be provided.

The recording layer 120 may be made of a metal oxide or a high molecular compound. For example, the recording layer 120 is preferably made of a metal oxide made of at least one selected from gold oxide (AuO _X ), palladium oxide (PdO _X ), platinum oxide (PtO _X ), and silver oxide (AgO _X ). The polymer compound is preferably C ₃₂ H ₁₈ N ₈ , H ₂ PC (Phthalocyanine).

In the information storage medium according to the present invention having the configuration described above, a reproduction beam is incident through an objective lens from above through the cover layer 140, and the recorded data is reproduced through the substrate 100. .

Specifically, when reproducing the super-resolution data formed on the deeper groove G2, melting occurs in the phase change film in the local high temperature region in the laser spot when the power of the reproduction beam becomes higher than a predetermined power. At this time, by the super resolution effect obtained by the difference in the optical properties of the melted portion and the non-melted portion, it is possible to reproduce small marks below the resolution.

In addition, when reproducing predetermined data formed on the groove G1 having a lower depth, for example, data recorded in the Blu-ray Disc method, at the time of reproducing small marks below the resolution recorded using the super-resolution near field structure. The reproduction is performed by irradiating a reproduction beam having a power lower than that of the reproduction beam.

On the other hand, information on the depth of the grooves formed on the track during recording / reproducing of the information storage medium, that is, information for determining whether to record / reproduce in a groove of a position through a beam of power using a super resolution phenomenon. Etc. may be recorded in the lead-in area and / or the lead-out area of the information storage medium. Here, the information about the information storage medium includes information about the type of the information storage medium, the optimal recording power and the reproduction power for the information storage medium.

This information is basically information that the drive system needs to know before recording or reproducing the data on the information storage medium. Pre-pit mark or pre-recorded mark or wobble ( Wobble) in advance in the lead-in area and / or the lead-out area.

13 is a block diagram schematically showing an apparatus for recording / reproducing an information storage medium according to the present invention. As described above, the information storage medium according to the present invention records data recorded in different recording methods on grooves having different depths, that is, data using a super resolution method and data using a non-super resolution method together. Therefore, the reproduction power needs to be changed depending on the type of data read. In other words, relatively high reproduction power of about 2.0 mW is required for data reproduction using the super resolution method. In contrast, a relatively low reproduction power of about 0.35 mW is required when reproducing predetermined data recorded in a non-super resolution method, for example, a Blu-ray disc method. Therefore, the reproduction apparatus according to the present invention needs to change the reproduction power in accordance with the recording method of data to be reproduced in consideration of these characteristics.

Referring to FIG. 13, the recording / reproducing apparatus 200 according to the present invention irradiates a laser beam to the driving unit 210 and the information storage medium 230 to rotate the information storage medium 230 and the information storage medium. Pick-up unit 250 for detecting the light beam reflected from the 230, and the control unit 260 for controlling the pickup unit 250. In particular, the control unit 260 according to the present invention is reproduced by using a super-resolution effect of which grooves the data is recorded in the grooves having different depths when the data recorded on the information storage medium 230 is reproduced. The pickup unit 250 is controlled to change the power of the reproduction beam depending on whether the data is to be reproduced or is to be reproduced by using a non-super resolution effect.

The pickup unit 250 includes a light source 251, a beam splitter 253 for converting a propagation path of an advancing beam, an objective lens 255 and a photodetector 257 for focusing a beam directed to the information storage medium 230. It includes. The light source 257 irradiates a laser beam of a predetermined power. That is, the power of the beam irradiated from the light source 257 is variable, and beams of different power depending on whether the data using the super resolution effect or the non-super resolution effect of the information storage medium 230 are used. Investigate The photodetector 257 receives the beam reflected from the information storage medium 230 and provides it to the controller 260.

The controller 260 reproduces the data by processing the signal detected by the photodetector 257. The controller 260 includes a preamplifier 261, a signal processor 263, a system controller 265, and a power controller 267.

The signal processor 263 receives data from the preamplifier 261 and processes the signal and provides the signal to the outside of the reproduction apparatus or to the system controller 265.

The power control unit 267 controls the light source 251 according to the depth of the groove in which the data is recorded when reproducing the predetermined data recorded in the groove of the information storage medium 230, thereby providing a groove having a deeper depth. When the data recorded in the G2 is to be reproduced, the power of the beam irradiated from the light source 251 is controlled to irradiate a beam of higher power than when reproducing the data recorded in the groove G1 having a lower depth. .

The system controller 265 controls each component of the reproduction device 200 and determines what type of data is recorded in the groove to be reproduced through the reproduction signal provided from the signal processing unit 263. . For example, the system controller 265 controls the power controller 267 to initially irradiate a reproduction beam suitable for low power, that is, non-super-resolution data reproduction, and then detect a beam reflected from the groove. It is determined whether predetermined data is detected. Through this, it is determined whether the groove in which the data to be reproduced is currently recorded is a super resolution method or a non-super resolution method.

The recording / reproducing apparatus according to the present invention having the above structure has a relatively high power reproduction beam when reproducing data in which predetermined data is recorded with a small mark of less than resolution using a super resolution effect among grooves of the information storage medium. When reproducing data recorded by a general recording method that does not use a super resolution effect, and irradiating a reproduction beam of a relatively lower power than when reproducing data using the super resolution effect, A reproduction operation is performed with a reproduction beam, and crosstalk caused by adjacent tracks is prevented to prevent degradation of the reproduction signal.

On the other hand, the present invention has been described with a focus on the reproduction apparatus, but even in a recording apparatus for recording predetermined data on the information storage medium, a higher power recording beam is used for a groove having a deeper depth. It is also applied to a recording apparatus that records small marks of less than resolution through the super resolution effect and records predetermined data through a low power recording beam by a general recording method without using the super resolution effect on grooves having a lower depth. Can be.

14 is a flowchart illustrating a method of recording / reproducing an information storage medium according to the present invention.

Referring to FIG. 14, a reproduction beam of a predetermined power is irradiated to an information storage medium (300). Specifically, a reproduction beam of predetermined power is irradiated to the areas of the grooves G1 and G2 in which predetermined data is recorded. As described above, in the groove, predetermined data is recorded using either the super resolution method or the non-super resolution method, and the reproduction beam irradiated initially is lower than the power of the reproduction beam irradiated in the super resolution method. The reproduction beam used in the non-super resolution method with power is irradiated. For example, when the Blu-ray recording method is used as the non-super resolution method, a relatively low power reproduction beam of 0.35 mW is irradiated.

Next, the beam reflected from the information storage medium is received through a photodetector, and the data recording method of the groove to be read is determined therefrom (305). Here, since a non-super resolution method was initially assumed and a reproduction beam having a relatively low power was irradiated, the groove to be reproduced is a groove having a relatively small depth, and predetermined data is recorded in a non-super resolution method. If so, a predetermined data signal is detected by the irradiation of the low power reproduction beam.

On the other hand, if the groove to be read is a groove having a relatively large depth and predetermined data is recorded in a super resolution manner, the low power reproduction beam is not enough power to cause a super resolution effect. Is not detected. Therefore, how the data is recorded in the groove to be reproduced by irradiating the low power reproduction beam and receiving the reflected beam, that is, the depth of the groove of which the groove to be reproduced is relatively large and small in depth. It can be determined whether the groove having a.

Through the above-described method, the current recording method of the data to be reproduced is determined (310), and if the data recorded in the super resolution method is increased (315), the playback is performed by increasing the power of the reproduction beam (320). For example, the power of the reproduction beam for reproducing the data recorded in the super resolution method is approximately 2.0 mW. If the current data to be reproduced is non-super resolution data that can be reproduced through the low power reproduction beam, the reproduction is performed by maintaining the power of the current reproduction beam (320).

Even when predetermined data is recorded on the information storage medium, similarly to the reproducing method, predetermined data is recorded by irradiating a recording beam having a relatively low power to the groove of the information storage medium. Next, the groove to which the current data is to be recorded by detecting the reproduction signal by the recorded data is a portion to record data through a relatively high power recording beam using a super resolution method, or a non-super resolution method. It is determined whether the data is to be recorded through the recording beam of a relatively low power. As a result of the determination, the power of the grooved surface recording beam having a large depth in which data should be recorded in the super resolution method is increased, and in the non-super resolution method, data is recorded while maintaining the power of the current recording beam.

As described above, the information storage medium according to the present invention can provide a high quality reproduction signal by reducing crosstalk by adjacent tracks during reproduction.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

According to the present invention as described above, the crosstalk at which the quality of the playback signal is degraded by adjacent tracks during playback can be reduced. In addition, according to the present invention, even when the track pitch is decreased for increasing the recording density, crosstalk by adjacent tracks can be reduced.

Claims (13)

In the information storage medium, Board; A first groove and a second groove alternately formed on the substrate, An information storage medium, characterized in that the depth of the first groove and the second groove is formed differently. The method of claim 1, An information storage medium, characterized in that predetermined data is recorded on a groove having a greater depth among the first and second grooves by using a super resolution method. The method of claim 1, And a predetermined data is recorded on the groove having the smaller depth among the first and second grooves by using a non-super resolution method. The method of claim 3, wherein The non-super resolution method is an information storage medium, characterized in that any one of DVD, HD-DVD, Blu-ray. The method of claim 1, And information on the first and second grooves is recorded in a predetermined area of the information storage medium. An information storage medium recording / reproducing apparatus including grooves alternately formed on a substrate and having grooves having different depths, A pickup unit for irradiating the information storage medium with a beam having a predetermined power and detecting light reflected from the medium; And a control unit for controlling the power of the beam irradiated from the pickup unit according to the depth of the groove formed on the information storage medium. The method of claim 6, And the control unit controls the pickup unit to irradiate a beam with power to record data in a groove having a greater depth among the grooves or to generate a super resolution effect when the recorded data is reproduced. The method of claim 6, The control unit controls the pickup unit to irradiate a beam at a power lower than the power for recording data in a groove having a smaller depth among the grooves or generating a super resolution effect when the recorded data is reproduced. Playback device. The method of claim 6, And the controller is configured to determine a method of recording data recorded in the groove by detecting a beam reflected by the irradiated beam after irradiating a low power beam to the information storage medium.  In the recording / reproducing method of the information storage medium including grooves alternately formed on the substrate and having grooves having different depths, Irradiating a beam on the medium by varying the power of the beam irradiated from the pickup according to the depth of the groove formed in the medium; And Detecting light reflected from the medium by the irradiation of the beam. The method of claim 10, And the beam irradiated from the pick-up is irradiated with a power to generate data in a groove having a greater depth among the grooves or to generate a super resolution effect when the recorded data is reproduced. The method of claim 10, And the beam irradiated from the pickup is irradiated with a lower power than that of recording data into a groove having a smaller depth among the grooves or generating a super resolution effect upon reproduction of recorded data. The method of claim 10, The beam irradiated at the pickup is initially irradiated with a low power suitable for recording data on a groove having a smaller depth or for reproducing the recorded data, and when the groove has a deeper depth, the power of the beam is increased. A recording / playback method characterized by the above-mentioned.

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