CN114627900B - Method for positioning transparent and uniform storage medium - Google Patents
Method for positioning transparent and uniform storage medium Download PDFInfo
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- CN114627900B CN114627900B CN202210289619.3A CN202210289619A CN114627900B CN 114627900 B CN114627900 B CN 114627900B CN 202210289619 A CN202210289619 A CN 202210289619A CN 114627900 B CN114627900 B CN 114627900B
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
- G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00451—Recording involving ablation of the recording layer
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00455—Recording involving reflectivity, absorption or colour changes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention belongs to the technical field of storage medium positioning, and discloses a method, a system and an application capable of positioning a single storage medium, wherein an optical head adopts a double-objective or double-light-spot scheme; the spiral line of the prefabricated three-dimensional material is written in an open-loop writing mode, and addresses with layer information are written in a spiral line with a certain width; address information is identified at specific locations of the spiral during pre-preparation inscription. The scheme of the invention, which can be positioned on a single storage medium, can ensure that different logic layers can be found in a single storage material, and realize the reading and writing operation of information data. The format and the layer-jump scheme based on the format can realize accurate layer-jump operation, and have important significance for realizing multi-layer data reading and writing subsequently; the spiral line with a certain width adopting the layer jump scheme only occupies less storage space for identifying layer numbers, does not occupy too much storage space of users, and improves the storage capacity of three-dimensional storage.
Description
Technical Field
The invention belongs to the technical field of storage medium positioning, and particularly relates to a method, a system and an application capable of positioning in a single storage medium.
Background
At present, after commercialization of the blue light technology, researchers have conducted comprehensive researches on optical discs and storage devices thereof, and the main purpose of the researches is to increase the storage capacity of the optical discs so as to cope with the data storage requirements of the large data age and obtain the advantages of the large-capacity storage devices such as hard discs. The conventional optical discs such as CD, DVD and blu-ray BD have been mainly improved in storage density by reducing the wavelength of incident light and increasing the numerical aperture of the objective lens to improve the writing density or reading resolution, and if the light with wavelength λ is used as the incident light source and the numerical aperture of the objective lens is λ, the theoretical storage area density and the numerical aperture of the objective lens are the same
Proportional to the ratio. The current storage density of optical discs is limited by the size of the recording spot, and it is common to increase the storage capacity by increasing the numerical aperture NA of the objective lens and using a light source with a shorter wavelength as much as possible, and even the latest commercial product, namely, the archival disc, uses NA of 0.85 and 405nm, from the viewpoints of cost and manufacturing difficultyTo further increase the storage density, researchers have considered to fully exploit the dimension perpendicular to the disk (depth direction) to develop from discrete, limited polyhedral storage (currently the most commonly done in the industry is single-sided 3 layers) to three-dimensional continuum storage, where theoretical storage densities can be reached>
The storage density is improved by one order of magnitude, and the corresponding storage capacity can be improved by several orders of magnitude.
Three-dimensional recording in a single (uniform) storage medium, typically comprising a thicker recording layer and a reference layer, the reference layer serving as a servo to provide spatial and temporal reference information; the recording layer is used for recording data. Volume storage combines lower cost with higher theoretical storage capacity than existing multi-recording layers. The use of a single storage medium naturally greatly increases the optical transmission and reduces the loss of incident light in the medium, but does not provide spatial information in the direction perpendicular to the disc and thus does not allow addressing operations to be completed. If this problem cannot be resolved, single media volume storage devices cannot be made available.
The invention aims to provide a method for providing addressing information in the depth direction by using a uniform material, so as to complete the layer jump operation of a storage device using a transparent uniform material.
For the layer jump operation of an optical disc having a plurality of recording layers (the focusing position of a laser spot moves between different recording layers), the conventional optical disc apparatus generally turns off the focusing servo subsystem and the tracking servo subsystem to be in an open loop state, and then drives the objective lens to move along the interlayer direction, i.e., the axial focusing direction, so that the focus moves to a range including the target recording layer; then the focusing servo is turned on to enter a closed loop state to complete focusing (to focus the laser spot on the target information layer), and simultaneously the tracking servo is enabled to complete tracking. Thus, the layer jump operation is completed. However, in many known technical schemes, the layer jump is performed by jumping to the vicinity of the focal point of the target recording layer in an open loop manner, which is equivalent to blind jumping, and then searching in a range to complete the layer jump operation; implementation of this approach depends on the accuracy of the actuator, the quality of the disc manufacturing. The layer jump scheme of the invention is always in a closed loop state, and is always in a closed loop mode (see figure 7) after the known servo surface, thereby greatly reducing the open loop precision of an actuating mechanism and the quality requirement of mass manufactured discs. The servo surface may be on the surface (based on the entrance surface) or the bottom surface of the transparent uniform storage medium.
Through the above analysis, the problems and defects existing in the prior art are as follows: the existing single storage medium cannot provide space information in the direction perpendicular to the disc, and single medium storage cannot be realized; the precision requirement on the device executing mechanism is high, and the disc quality requirement is high.
The current scheme of open loop layer jump is adopted in the storage medium with a plurality of recording layers, the problem that the required layer cannot be found accurately once in layer jump operation can occur, higher requirements are required on the quality of a disc, higher requirements are required on the precision of a layer jump executing mechanism, and certain requirements are required on axial or radial deflection in the rotation process of the disc (namely, higher requirements are required on the quality of the disc). The scheme of the invention is that the spiral line with a certain width and format starts from the servo surface and ends at the data tracks of each data layer along the pre-writing, and reaches the target layer to directly enter the data tracks, thereby omitting the process of switching from an open loop state to a closed loop state. In comparison, the servo format and the layer jump operation based on the servo format are added, the time required is shorter, and the requirements on an executing mechanism and a disc are lower.
Disclosure of Invention
In view of the above, the present invention provides a method that is mainly applied to transparent (not limited to optical transparency) and uniform material (with a certain depth) and accurately positioning in the depth direction, but the method is not limited to transparent and uniform medium, and can also be applied to heterogeneous material.
Currently, the main application scenario for using this approach is optical storage systems using transparent, homogeneous bulk storage materials.
The precondition for implementing the invention is that the servo information is prefabricated on the surface of the transparent homogeneous material, and two-dimensional plane information and time information are provided for a servo positioning system. Servo information that may be used includes, but is not limited to, servo information in standardized servo formats, such as CD, DVD discs; and custom servo information.
A second premise is that the servo positioning system comprises means for forming two spots that are independently movable in the depth direction, determined in the planar direction, and moved in relation. Currently available devices include Optical pick-up heads (OPUs) that use a single objective lens to form a dual spot and a dual objective lens to form a dual spot.
The method capable of positioning in the depth direction of a single storage medium comprises the following steps:
step one, the optical head adopts double objective lenses or double light spots;
prefabricating servo surface information and a spiral line of a three-dimensional material (the spiral line can be prepared by adopting an open loop writing mode), and writing data layer mark information on the spiral line with a certain width;
and step three, the method is used for reading the layer number address information marked at the specific position of the spiral line during pre-preparation and writing, and realizing layer jump operation.
Further, the dual objective lens scheme in the first step includes:
the two objective lenses are horizontally arranged on the objective lens frame, and the realization of the associated movement of the two objective lenses in the horizontal direction can be ensured through the design of the objective lens frame; the objective lens 2 for reading and writing and the objective lens 1 for servo in the vertical direction are independently moved. The laser produces two spots through the objective lens, one for servo and the other for read and write operations of the bulk storage.
Further, the dual objective lens solution in the first step further includes:
one beam of light is reflected to the objective lens 1 by a right-angle prism and focused on a reference servo surface, and the reflected light is finally converged on a detector (such as a four-quadrant detector of a DVD) to generate a servo error signal; the other beam of light is reflected to the objective lens 2 through the lens and the prism and finally focused on the recording layer, and the light reflected by the recording layer is also converged on the other photoelectric detector to generate a data signal stored in the recording layer.
Further, in the second step, during prefabrication, a spiral line with a certain width can be prepared by a method of processing a storage material of a body, such as a femtosecond laser, and a certain servo format is set for a detection and readout part to obtain information including focusing error, tracking error and a read channel; simulating a spiral line with a certain width to be a reflecting layer similar to a CD, and making marks of the reflecting layer to meet the servo bandwidth requirement of a servo system; when the preparation is successful, a specific layer can be found from all recording layers, and the specific layer can be moved from the servo layer to the data layer in a closed loop manner along the spiral line at a certain speed until the specific layer is found.
Further, during the layer jump control in the third step, reading address information on a specific position mark of the spiral line during pre-preparation writing, indicating that the position 1 is a first layer, the position 2 is a second layer, and the position 3 is a third layer, and performing multi-layer marking; wherein the address at 1 is 0X01, the address information at 2 is 0X02, and the address information at 3 is 0X03.
Further, in the subsequent layer jump process, the focusing servo and the tracking servo of the servo layer used as references need to be started, normal focusing and tracking are completed, the objective lens 2 is locked on the information track of the Wobble layer, and moves upwards at a certain speed along the spiral line from bottom to top, the servo system is required to be ensured to be in a stable servo state all the time while moving, at the moment, a reading channel is opened, the data signal of the mark layer number written in advance on the spiral line with a certain width is read, and the information of the layer number is decoded to obtain the information of the layer number which reaches the first layer at present.
It is another object of the present invention to provide a system for locating on a single storage medium, using the method for locating on a single storage medium, the system for locating on a single storage medium comprising:
the scheme determining module is used for adopting a double-objective or double-light-spot scheme for the optical head;
the address writing module is used for writing the address with layer information on the spiral line with a certain width in an open-loop writing mode of the spiral line of the prefabricated three-dimensional material;
and the layer jump control module is used for marking the address information at the specific position of the spiral line when the inscription is prepared in advance.
It is a further object of the present invention to provide a computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:
the optical head adopts a double objective lens or double light spot scheme; the method comprises the steps of writing addresses with layer information on a spiral line with a certain width in an open-loop writing mode by a spiral line of a prefabricated three-dimensional material; address information is identified at specific locations of the spiral during pre-preparation inscription.
Another object of the present invention is to provide a computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
the optical head adopts a double objective lens or double light spot scheme; the method comprises the steps of writing addresses with layer information on a spiral line with a certain width in an open-loop writing mode by a spiral line of a prefabricated three-dimensional material; address information is identified at specific locations of the spiral during pre-preparation inscription.
Another object of the present invention is to provide an information data processing terminal for implementing the system capable of positioning on a single storage medium.
In combination with the above technical solution and the technical problems to be solved, please analyze the following aspects to provide the following advantages and positive effects:
first, aiming at the technical problems in the prior art and the difficulty in solving the problems, the technical problems solved by the technical proposal of the invention are analyzed in detail and deeply by tightly combining the technical proposal to be protected, the results and data in the research and development process, and the like, and some technical effects brought after the problems are solved have creative technical effects. The specific description is as follows:
the format and the layer-jump scheme based on the format can realize accurate layer-jump operation, and have important significance for realizing multi-layer data reading and writing subsequently. The spiral line with a certain width adopting the layer jump scheme only occupies less storage space for identifying layer numbers, does not occupy too much storage space of users, and further improves the storage capacity of three-dimensional storage.
Secondly, the technical scheme is regarded as a whole or from the perspective of products, and the technical scheme to be protected has the following technical effects and advantages:
the invention provides a scheme capable of positioning in a single storage medium, which can ensure that different logic layers can be found in a single storage material and realize reading and writing operation of information data.
Thirdly, as inventive supplementary evidence of the claims of the present invention, the following important aspects are also presented:
(1) The expected benefits and commercial values after the technical scheme of the invention is converted are as follows:
the positioning mechanism and servo system are one of the cores of the optical disc format and industry, and the patent use cost is contained in the preparation of the disc and the realization of chips and software. The formation of the patent is one of important directions for breaking through the limit of optical storage capacity, and has important significance for promoting the development of new optical disk systems in China and forming intellectual property barriers beneficial to China.
(2) There is no system for storing optical discs in China, the data format, including the positioning in the depth direction, is blank, and the technical proposal of the invention fills the technical blank in the domestic and foreign industries.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for enabling location on a single storage medium provided by an embodiment of the present invention;
FIG. 2 is a block diagram of a system architecture that can be located on a single storage medium according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a dual objective lens placement position according to an embodiment of the present invention;
FIG. 4 is a schematic view of a spiral with a certain width processed in a bulk material according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a basic structure of a single storage medium with a servo layer and a recording layer according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an identification layer number of address information on a spiral provided in an embodiment of the present invention;
FIG. 7 is a schematic view showing the surface and depth of a recording medium provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of a CD-ROM servo control system constructed by FPGA+DSP+ARM according to an embodiment of the present invention;
FIG. 9 is a physical diagram of an optical disk drive servo control system built by FPGA+DSP+ARM according to the embodiment of the invention;
in the figure: 1. a scheme determination module; 2. an address writing module; 3. and the layer jump control module.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In view of the problems of the prior art, the present invention provides a method, system and application capable of positioning on a single storage medium, and the present invention is described in detail below with reference to the accompanying drawings.
1. The embodiments are explained. In order to fully understand how the invention may be embodied by those skilled in the art, this section is an illustrative embodiment in which the claims are presented for purposes of illustration.
As shown in fig. 1, a method for positioning on a single storage medium according to an embodiment of the present invention includes:
s101, adopting a double-objective or double-light-spot scheme for the optical head;
s102, writing addresses with layer information on a spiral line with a certain width in an open-loop writing mode by a spiral line of a prefabricated three-dimensional material;
s103, the layer jump operation is realized by reading the layer number address information marked at the specific position of the spiral line during the pre-preparation inscription.
As shown in fig. 2, a system capable of positioning on a single storage medium according to an embodiment of the present invention includes:
the scheme determining module 1 is used for adopting a double-objective or double-light-spot scheme for the optical head;
the address writing module 2 is used for writing the address with layer information on a spiral line with a certain width in an open-loop writing mode of a spiral line of the prefabricated three-dimensional material;
and the layer jump control module 3 is used for reading the layer number address information marked at the specific position of the spiral line during the pre-preparation and writing so as to realize the layer jump operation.
The specific embodiments of the present invention are as follows:
the optical head can adopt a double-objective or double-spot scheme, wherein the double-objective scheme horizontally places two objective lenses on the objective lens frame, and as shown in fig. 3, the two objective lenses are bound on the same radial coil in the horizontal direction, namely the radial direction and move together; the objective lens 2 for reading and writing in the vertical direction is freely movable. The two laser beams generate double light spots through the objective lens, one of the two laser beams is used as a servo, and the other is used as a read-write operation of bulk storage. Generally, a beam of light is reflected by the rectangular prism to the objective lens 1 and focused on a reference surface (Wobble layer), and the reflected light is finally converged on the four-quadrant detector to generate a servo signal. The other beam of light is reflected to the objective lens 2 through the lens and the prism and finally focused on the recording layer, and the light reflected by the recording layer is also converged on the other four-quadrant detector to generate an actual recording layer data signal. The present invention mainly focuses on how to find a specific recording layer correctly among all 20 recording layers, providing a layer jump scheme. A single storage medium servo layer and recording layer schematic is shown in fig. 5.
Writing an address with layer information on a spiral line with a certain width in an open-loop writing mode by prefabricating a spiral line of a three-dimensional body material, wherein the spiral line with a certain width can be prepared by a mode (such as dotting) of processing the storage material of the body by femtosecond laser during prefabrication, and a certain servo format including focusing error, tracking error and information of a read channel is set at the same time; the spiral line with a certain width is simulated as much as possible to be similar to the reflecting layer of an optical disc, and the marks are manufactured to meet the servo bandwidth requirement of a servo system. When the preparation is successful, a specific layer can be found from all recording layers, and the specific layer can be moved from the servo layer to the data layer in a closed loop manner along the spiral line at a certain speed until the specific layer is found.
A schematic diagram of a spiral with a certain width machined in the bulk material is shown in fig. 4, wherein the pre-pressed track of the lowest reference layer (Wobble) used as servo is indicated by blue lines and the spiral of the subsequent machining of the bulk material is indicated by yellow dashed lines. The relation between the movement of the focused light spot generated by focusing the laser beam through the objective lens 1 along the spiral line and the pre-pressed track in the wobble is as follows: the spot moves horizontally along the wobble track and moves up at a certain rate in the vertical direction, which together appears to rise in a spiral along the bulk material.
The pre-pressed track in figure 4 is drawn in different colours with the spiral in the bulk material, illustrating that the former is pre-pressed (basic, precondition) and the latter is subsequently processed, for example with femtosecond processing (which may have different forms and formats).
Address information is marked at a specific position of the spiral line when writing is prepared in advance, the mark is indicated to be a first layer at a position 1 (address is 0X 01), a second layer at a position 2 (address is 0X 02), and a third layer at a position 3 (address is 0X 03), and the layers are marked in this way, as shown in fig. 6. In the subsequent layer jump process, the focusing servo and the tracking servo of the servo layer used as references need to be started, normal focusing and tracking can be completed, the objective lens 2 is locked on the information track of the Wobble layer, and simultaneously moves upwards at a certain speed along the spiral line from bottom to top, the servo system is required to be ensured to be in a stable servo state all the time while moving, a reading channel is opened at the moment, a data signal of a mark layer number written in advance on the spiral line with a certain width is read, and the information of the layer number is decoded to obtain the information of the layer number which reaches the first layer at present.
2. Application example. In order to prove the inventive and technical value of the technical solution of the present invention, this section is an application example of the specific product or related technology application of the claim technical solution.
As shown in fig. 8 to 9, focusing servo and tracking servo are required for the reference plane servo required for the three-dimensional volume storage jumping operation, and normal focusing and tracking are required to be started and completed, and locked on the information track of the Wobble layer. A set of CD-ROM servo control system is built through FPGA, DSP and ARM, and a foundation is laid for subsequent uniform volume storage layer jump and data reading and writing.
It should be noted that the embodiments of the present invention can be realized in hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or special purpose design hardware. Those of ordinary skill in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such as provided on a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The device of the present invention and its modules may be implemented by hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., as well as software executed by various types of processors, or by a combination of the above hardware circuitry and software, such as firmware.
3. Evidence of the effect of the examples. The embodiment of the invention has a great advantage in the research and development or use process, and has the following description in combination with data, charts and the like of the test process.
Compared with the prior art, the layer jump scheme of the uniform dielectric body storage can realize more accurate interlayer movement, the required time is shorter, the speed is faster, and the tolerance to the disc is higher.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention.
Claims (8)
1. A method of enabling location on a single storage medium, the method comprising the steps of:
step one, adopting a double objective lens or a double light spot group as an optical head;
prefabricating servo surface information and a spiral line of a three-dimensional material, and writing data layer mark information on the spiral line with a certain width;
step three, the layer number address information marked at the specific position of the spiral line during pre-preparation and writing is read, so that the layer jump operation is realized;
the dual objective lens in the first step comprises:
two objective lenses are horizontally arranged on the objective lens frame, and the two objective lenses are bound on the same radial coil to move together in the horizontal direction; the objective lens 2 for reading and writing is free to move in the vertical direction; the two laser beams generate double light spots through the objective lens, one of the two laser beams is used as a servo, and the other laser beam is used as read-write operation of bulk storage;
the dual objective lens in the first step further comprises:
one beam of light is reflected to the objective lens 1 by the right-angle prism and focused on the reference surface, and the reflected light is finally converged to the four-quadrant detector to generate a servo signal; the other beam is reflected to the objective lens 2 through the lens and the prism and finally focused on the recording layer, and the light reflected by the recording layer is also converged on the other four-quadrant detector for generating an actual recording layer data signal.
2. The method of claim 1, wherein the step two is performed by preparing a spiral line with a certain width by way of a femtosecond laser processing of a storage material of a body while setting a certain servo format including a focus error, a tracking error, and a mark of a read channel; simulating a spiral line with a certain width into a reflecting layer of an optical disk, and meeting the servo bandwidth requirement of a servo system; when the preparation is successful, a specific layer is found from all the recording layers in a closed loop mode, and the recording layers climb from bottom to top at a certain speed along the spiral line until the required specific layer is found.
3. The method of claim 1, wherein the address information is marked on a spiral specific location in the step three when the writing is prepared in advance, the address information is indicated to be a first layer at a location 1, a second layer at a location 2, a third layer at a location 3, and the multi-layer marking is performed; wherein the address at 1 is 0X01, the address information at 2 is 0X02, and the address information at 3 is 0X03.
4. A method of positioning a single storage medium as claimed in claim 3, characterized in that during subsequent layer jump the focus servo and tracking servo of the servo layer used as references are turned on and normal focusing and tracking is completed, locked on the information track of the Wobble layer, while the objective lens 2 is moved upwards from bottom to top along the spiral line at a certain rate, while moving it to ensure that the servo system is always in a stable servo state, at which time the read channel is turned on, the data signal of the pre-written mark layer number on the spiral line with a certain width is read, and the information of the number of layers is decoded to obtain that the layer number has reached the first layer.
5. A system capable of being located on a single storage medium applying the method capable of being located on a single storage medium according to any one of claims 1 to 4, characterized in that the system capable of being located on a single storage medium comprises:
the scheme determining module is used for enabling the optical head to adopt double objective lenses or double light spots;
the address writing module is used for writing the address with layer information on the spiral line with a certain width in an open-loop writing mode of the spiral line of the prefabricated three-dimensional material;
and the layer jump control module is used for reading the layer number address information marked at the specific position of the spiral line when the writing is prepared in advance, and realizing the layer jump operation.
6. A computer device comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the method of any one of claims 1 to 4, which is capable of being located on a single storage medium.
7. A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the method of any one of claims 1 to 4, being locatable on a single storage medium.
8. An information data processing terminal for implementing the system capable of being located on a single storage medium as claimed in claim 5.
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| CN1716394A (en) * | 2005-06-03 | 2006-01-04 | 清华大学 | Automatic focusing and path tracking device and method for double photon three dimension disc type storage |
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| US7006425B1 (en) * | 1998-11-30 | 2006-02-28 | Kabushiki Kaisha Toshiba | Information recording and/or reproducing method and apparatus for three dimensional optical recording medium |
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