JPH04507321A - Interactive optical disc, manufacturing method, and device for recording thereon - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Interactive optical discs, manufacturing methods, and devices for recording thereon Industrial applications The present invention relates to the field of recording media. In particular, one embodiment of the present invention provides for pre-recorded The data or information provided by the user and the data or information provided by the user are stored on the same optical disk. To provide an optical disc on which data can be recorded.

Conventional technology ] Optical data storage media in the form of compact discs are used for long-playing records and magnetic A well-known alternative to tape cassettes is isk, especially for this type of device. A common disc player is designed for discs. These disks are It has a reflective surface that contains pits, which represent data in binary form. Two. These bits and how they work are explained in Watki "Digital audio technology" by Nson et al., Focal Publishing, Chapter 13 It has been described.

Compact discs are currently used to produce traditional long-playing records. It is manufactured using a press process similar to that previously used. In this specification, "master This process, called ``processing,'' begins by polishing the brain glass optical disc. will be started. This disc has an external diameter of 200-240mm and a thickness of 6mm. and undergo various cleaning and cleaning stages. This disc is then thin Covered with chrome film or coupling agent, glass disk and photosensitive material A final step is taken to produce adhesion between the layers of photoresist. Compa The data on the disc master tape is then processed using a laser beam cutting method (LAS). er beamcutting method) to the glass disk. It will be done.

This glass disk still remains after being written by a laser beam on it It is completely flat. Because until the glass is photorealistically developed, a bit is not formed. The surface of this disk is first made electrically conductive. , then undergoes nickel evaporation treatment. This disc known as a glass mask later on, a process similar to that used to make analog sound records was produced. Electrocasing is done.

A series of metal repetitions follows, resulting in a disc called a stamper. . This stamper means it is the reverse of the final compact disc , i.e. in the sense that a bit exists if a bump exists. , similar to a photographic negative. This stamper was then made of polyvinyl chloride, On transparent polymers such as poly(ethyl-methacrylate) and polycarbonate used to press. The stamped surface is then coated with an aluminum laminate. The metal is plated with a reflective film like any other metal, and finally A plastic coating is applied to one side, thus forming a rigid structure.

This player focuses the laser beam onto the metal that reflects through the base layer, and It operates by detecting the reflected light of the

The optical properties of the substrate, such as its thickness and index of refraction, are important for the player's detection system. standard players are especially sensitive to these parameters. It has been designed as desired using data.

These bits increase the optical path of the laser beam by the amount of 1/2 wavelength. , producing destructive interference when combined with other (unshifted) reflected beams. Put it away. The presence of data thus takes the form of a decrease in the intensity of the reflected light. mark This detection system on a standard player thus produces destructive interference. Greater than 70% reflection if no data exists, 30% if data exists Designed to require larger modulation amplitude.

These strength limits are combined with matching parameters to other optical data that can be read or played on a player such as Establish standards for data storage media.

Data can be recorded directly onto it and read directly from it. Such media have different forms and operate under somewhat different policies.

An example of this is described in U.S. Pat. No. 344,719.615 (Feyer et al.). It is. This medium, disclosed by Peyer et al., has a structure that expands when heated. A lower extended layer of rubbery material is included. This extended layer is glassy at ambient temperature. It is combined with a similar upper invariant layer. Both these layers are supported on a rigid base layer ing. The expansion and permanent layers each contain dyes that absorb light at different wavelengths. day The data is recorded by heating this extended layer, which is By absorbing light from the beam at a "record" wavelength, this expansion layer moves away from the base layer. so that it expands and forms protrusions or "bumps" that extend into the permanent layer. Depends on the situation. While this is occurring, the constancy layer undergoes its glass transition (trans It is not possible to accommodate this bump because the temperature rises to a temperature higher than 1on). It becomes something that can be deformed to suit. When the beam is extinguished, this invariant layer This band is rapidly cooled to a glassy state before bell-out, thereby fix the block. Reading or playback of data is performed using a low-intensity “readout” This is accomplished by a beam of light that is partially reflected between the fixed layer and the air. Matched on the interface. When this readout beam collides with the bump, Some of the reflected light is scattered, while other parts of the reflected light are scattered in non-bumped areas. This will cause destructive interference with the reflected light from the other objects. The resulting decrease in intensity is applied to the detector. So get registered. Bump removal to erase data is absorbed into the immutable layer by a second laser beam at an “erasing” wavelength that is absorbed by the expansion layer but is not absorbed by the expansion layer. will be achieved. This beer is due to its viscoelastic irradiation and their extended layers that make it Something that warms the immutable layer only to a rubbery state, returning it to its original flat state. It is. All write, read and erase beams enter the medium on this permanent layer side. and pass through the immutability layer before reaching this extension layer.

Assigned to the assignee of this application and incorporated herein by reference for all purposes. Incorporated pending applications No. 294.723 and No. 357.377 are , discloses a number of improved optical data storage media. Books described herein One example herein includes an expansion layer, a permanent layer, and a reflective layer. The reflective layer provides two paths through the medium for writing on and erasing .

As well as the ability of the device to store user-provided or erasable data. Permanent data storage once prerecorded or written by the user; It would be desirable to provide an optical storage medium that includes both.

Summary of the invention An improved optical data storage method and apparatus is disclosed. This method and device allows you to store write-protected data and user-supplied data on the same disk. can be memorized.

In one embodiment, an optical storage disc is provided with two regional areas. No. Regional area 1 is used for information recorded permanently or semi-permanently. It is. This permanent information is stored during the manufacturing of the disc, for example during the pressing process or given by such. The second regional area includes the Contains the elements written above. This second regional area is preferably erasable a dye-loaded expansion layer and an expanded medium such as a dye-loaded expansion layer; and a constancy layer for holding in state. Also, the second area is once It is a WORM (Write and Read) medium.

In other embodiments, the invention provides a source medium that includes a permanent or Used to emboss pre-recorded information such as write-protected information A first layer is included. The second layer of media is the layer on which the user can record. It is served as a snack. In a more preferred embodiment, this second layer includes A tension layer and a constancy layer for maintaining the expansion layer in an expanded state are included.

Information is read from the first layer and the second layer by a separate mechanism. for example The information is transferred from the first layer by differential absorption of the laser beam. bsorption) quantity, while the information can be read by the second layer It is synchronized with phase cancellation. Probably.

Thus, in one embodiment, the present invention provides non-erasable optically detectable information. for recording user-provided optically detectable information on the first area comprising; and a second region adapted to. In some embodiments, the storage medium includes a first a nearly flat area such that an area is horizontally transposed onto said disk from a second area; It's a disc. Also, this first region is the first layer of a roughly flat disk. The second region is a vertically displaced second disk layer.

A method of making a data storage medium is also provided. In one embodiment, this The method includes the steps of preparing a substratum and displacing an area perpendicularly onto the surface of this substratum. a preparatory step in which this vertically displaced region is permanently optically detectable. Prepare a stage that shows information and an area on the base layer where the user can record. The user-recordable area is optically activated in response to light of a first wavelength. representing detectable user-provided information.

In a more preferred embodiment, the user-provided and permanently stored information is The method of reading from an optical disk involves directing a first readout beam of a first wavelength onto an optical disk. The optical disk stores permanently stored information in binary form. A base layer having bumps represented by an extension layer and an immutability layer for maintaining the extension layer in an extended state, This extension layer is a layer such that it absorbs the second readout beam at a second wavelength. and a second readout beam having a wavelength of hi42. directing the beam to the position and absorbing the first read beam at the first position; user-provided information based on the amount of beam and second readout beam and permanently stored and determining whether information exists at the location.　“ Brief description of the drawing FIG. 1 shows a first embodiment of the interactive compact disc disclosed herein. vinegar.

FIG. 2 shows a cross section of the compact disc shown in FIG.

FIG. 3 shows an alternative embodiment of the invention in cross section.

FIG. 4 qualitatively shows the light intensities of the two reflected beams for the medium shown in FIG.

Example This specification describes optical storage media and methods for recording and reading information on the optical storage media. It gives This method and device are applicable to a wide variety of fields. Will. By way of example only, the method and apparatus utilize user-provided data. i.e., software on optical disks that is also used for permanent or temporary storage of information. It can be used for permanent write-protected storage of software. Also, this method and the device can also be used in the field of education. For example, the method and apparatus Used for permanent memory records such as those used in language laboratories or for students' temporarily recorded responses. It is possible to use Other applicable fields include the music industry, Japanese color There is an orchestra etc. Fields of its use will be clear to those skilled in the art upon further review of this disclosure. It will be.

Figures 1 and 2 show an example of an optical storage medium that can be used according to the invention. It is something. Generally, these media include a first regional area 2 and a second regional area 4. be caught. The first regional area 2 is software, data, audio recording, or music distribution. It is used for temporary or permanent storage of user-provided information such as records. The second area 4 is Permanent storage of prerecorded software, audio recordings, music recordings, or other information It is used as a record.

In a more preferred embodiment, the first region is as described in pending application no. 294.723. (assigned to the assignee of this invention and previously incorporated by reference herein). is an erasable medium selected from the selected media. In a more preferred embodiment, The second region is well known to those skilled in the art and is, for example, incorporated herein by reference. As disclosed in Watson (cited above), incorporated as It is of the type shown.

Furthermore, as shown in FIGS. 1 and 2, the first region and the second region are both placed on a base layer 6, which base layer is made of, for example, glass or polycarbonate. It would be a transparent substance like . In the second area 4, something like a filter 8 is installed. Contained above a polycarbonate base layer. This region 8 may be expanded, for example, only in the invariant layer. It may be only a tension substance, a combination of the two, or other substances, and is more preferable. Dye is attached to the object. Region 8 also includes reflective material, which The second area may be CD compatible.

The first region includes an enhancement layer 10 on the base layer. Above the extension layer is the immutability layer]2. It is given. A reflective layer 14 and a protective layer are provided on both the first region 2 and the second region 4. A layer 16 is provided. Seal areas 18 and 20 are located on the interior and exterior of the disc. given at the end.

The second area of the media is a press similar to that disclosed in Watkinson et al. The process embodies it with permanent information.

This outer first region of the disc is then covered with an expansion and constancy layer; A second region of the inner disc may be expanded, fixed, and/or covered with a reflective material. be exposed. A reflective layer 14 is then applied over these first and second regions. same Similarly, a protective layer 16 is provided over the entire reflective layer. In a more preferred embodiment The extension, permanent, and reflective layers are filed on the same day as this specification and are available to all eyes. Pending Application No. 357.377, incorporated herein for the purpose of storage medium.

In other embodiments, this second region is a write-once, read-many region. Ru. Such media include such as ablative materials.

Disc performance and recording as described in pending application no. 294,723 The device is then used to play or record information on the disc. Tori This device separates discs in a manner similar to that done with standard compact discs. It will identify information within two areas. One or more pieces of prerecorded information This play The player can process some information recorded in the first area.

The present invention primarily uses an extension/persistence layer to record user-provided information. Is it disclosed with reference to the use of such erasable media? ,Of course, those skilled in the art It will be obvious to those skilled in the art that other media could be used. example For example, magneto-optic media may be used in some embodiments. If this If two areas operate with different purposes, two separate A recording head will be required. For this, the implementation shown in Figures 1 and 2 is required. Examples are preferred.

Another more preferred embodiment of the invention is shown in FIG. This is the recording medium part A cross section of is shown. The embodiment shown in FIG. 3 has a permanent data record on the first layer, The regional area of And give coaching on top of such a layer.

Generally, a disc includes a base layer, data bumps or marks 102a therein, and A similar layer is included in which 102b is embossed. datum in the base layer 102 by conventional means known to those skilled in the art, such as pressing, or It would also be created through a once write multiple read process. more preferable In an embodiment, the data bump on the base layer is a conventional It's much deeper than what's on the compact disc. In the most preferred embodiment There are 6,000 people in the data stations 102a and 102b. Even more eternal days When providing a source of data, these bits indicate the record used in conjunction with the disk. It can also act as a tracking guide for

The base layer protects the media from external forces and is structurally rigid. ear) material or a substantially transparent material. just as an example Yes, but this base layer is made of something like glass or polycarbonate. cormorant. Other structures of the material will be apparent to those skilled in the art. In a more preferred embodiment, This base layer is polycarbonate and is approximately 1 mm thick.

Adjacent to the base layer, an expansion layer 104 is provided. This extension layer <a) it absorbs a percentage of the light energy that passes through it, (b) especially compared to other layers of the medium. (c) exhibit a high coefficient of thermal expansion when heated at the temperatures encountered during the recording process; If the When cooled without being held in place, it will shrink to its original flat state. It shows a high elastic modulus. At room temperature, the extended layer material has its glass transition temperature , preferably below 30°C, but near or above It will be. The coefficient of thermal expansion is approximately IXIO-'/''C or more If it is about 5X10-’/”C or more, the share is preferable. Yes, approximately? , 5 X 10-'/''C is most preferable. .

The absorption rate of light energy is 20% to 40% in the wavelength range of 850nm to 650nm. The extended layer can thus be heated using a writing beam. It will be. The standard To retain the ability to read data recorded on the source medium on the detection mechanism , approximately 10% of the maximum at the compact disc read wavelength (780, nm). a+maximum double pass absorption ion) is most preferred. Therefore, the expansion layer can be made of epoxy, polyurethane, polymer , amorphous polymer, rubber, natural rubber, butyl rubber, silicone rubber, styrene rubber Tajene rubber, acetate acetate, cellulose acetate butyrate, polystyrene, polysulfonate amide, polycarbonate, acetate nitride, poly(ethyl methacrylate) ), poly(vinyl butyryl), aromatic polyester, polyamide, acrylic polyester Limer, polyvinyl acetate, silicone resin, alkyd resin, styrene-butan Gen copolymer, vinyl chloride-vinyl acetate polymer, nitroacetic acid, One could choose from ethyl acetate and mixtures thereof. A more preferred embodiment wherein the expansion layer is selected from the materials disclosed in co-pending application no. 357,377. be done. In one embodiment, the expansion layer is approximately 1 micron or less. It is less thick than.

Adjacent to this enhancement layer, a constancy layer 106 is provided. This invariance layer is ( a) absorbs a percentage of the light energy that passes through it; and (b) absorbs a glass transition above room temperature. (C) If it is above this glass transition temperature, it is rubbery and the first When the active material layer of is heated, the expansion of this first layer causes formation in the second layer. (d) has sufficient elasticity to enable it to conform to the contours of the deformation to be performed; Even if the first layer is cooled to room temperature, it will have sufficient stiffness below the glass transition temperature. indicates the length, it will hold the expansion layer in the expanded state, such as made of matter. In a more preferred embodiment, the permanent layer 106 is A substance that exhibits at least some optical absorption at the wavelength of the laser, or It is formed by the combination of these substances. This erasure beam light wavelength is available may be selected from a wide spectrum of light wavelengths. The absorption rate is, for example, 650 With the exception of approximately 30% to 45% at wavelengths between nm and 860 nm, It will vary from wavelength to wavelength and from immutable substance to immutable substance. Therefore, this Fixed layers can be made of epoxies, polyurethanes, polymers, amorphous polymers, rubber, natural Rubber, butyl rubber, silicone rubber, styrene-butadiene rubber, acetic acid acetate , polysulfonamide, polycarbonate, acetate nitride, poly(ethyl methane) (acrylate), aromatic polyester, polyamide, acrylic polymer, polyvinyl Ruacetate, silicone resin, alkyd resin, styrene-butadiene copolymer , vinyl chloride-vinyl acetate copolymer, nitrocellulose, ethylcetate Lulose, and a mixture of these are made from challah. In a more preferred embodiment, this The immutable layer is assigned to the assignee of this invention and has the title of the invention "recording medium". No. 357.377. The thickness of the invariant layer is constant. Almost 0. It is 5 to 1.5 microns. In a more preferred embodiment This permanent layer is approximately between 0.5 and 1.0 microns thick.

A reflective layer 108 is provided adjacent to this permanent layer. The reflective layer 108 light (e.g., more than 25% of the light that impinges on it) for improved data recording and The data is reflected back through the enhancement layer and the invariant layer for data detection.

During the recording process, the reflective properties of this reflective layer double the input light beam through the medium. path, thus doubling the effective light beam path inside the medium. Therefore, The energy that tends to warm and thereby expand the various layers is the input light beam. It is absorbed in both directions. In a more preferred embodiment, this reflection The layers can be made of gallium, aluminum, copper, silver, gold, indium, tin or cadmium. formed of materials such as bismuth eutectic alloys with ing.

A protective layer 110 is also provided. This protection layer protects the data created within the extension layer. It has the function of absorbing Tabambu and protecting this medium from external forces. This protection The layer is made of glass or polycarbonate, for example.

To record on the active layer, light (denoted by hv) enters the base layer 100. , through an expansion layer 104 that absorbs a significant amount of energy at the wavelength of the light. late When this expansion layer is warmed, it expands into the invariant layer, thus forming a bump (112 a and 112a). These data as shown in the figure Bumps may be in the same location as data bumps in the base layer (bumps are 102b/112b) or alternatively at different locations within the substrate ( 102a/112a).

A significant portion of the input light beam passes through the invariant layer 106, which is also heated. The expansion layer is more easily accommodated as it is made softer and more flexible. Also this failure The degenerate layer is first warmed by conduction during writing, and the expansion layer is the invariant The layer absorbs light at a first wavelength (e.g. 830 nm) while the layer absorbs light at a second wavelength (e.g. 830 nm). absorbs light at >680 nm. Light is then added containing both of these wavelengths, Both layers are heated at the same time to write the data bump. Erase on the contrary In the case of , only a second wavelength is added to this medium, making its constancy layer flexible. Open. In yet other alternatives, these layers are incorporated herein. Absorbs light as disclosed in co-pending application no. 152,690.

The differential absorption of light between the fixed layer and the extended layer is determined by dyeing these layers using different dyes. Obtained by dye-1 loading.

Dyes or pigments used alone or in combination include nigrosine blue, Aniline blue, calco oil blue, ultramarine blue, methylene blue chloride, Monastral blue, malachite green azarate ( ozalate), Sudan Black BM.

Macrolex Green G, DDCI-4 and lR26 be. In a more preferred embodiment, the expansion layer is a savinal block. The invariant layer is tr1con blue and Loaded using vinyl blue.

Permanent data bumps 102a and 102b are read separately, but preferably from user-supplied data bumps 112a and 112b. They are read more or less simultaneously. In particular, in one embodiment, the permanent bump 10 2a and 102b are read by differential absorption of the input "readout" laser beam .

At or near the same time, the user-provided bumps may cause phase loss or reflected beams. It is read by the absence of mu. FIG. 3 shows four possible optical paths into the substrate, namely P , ,P, ,P, and P, are shown.

The optical path P passes through a substratum region that does not contain any information, that is, it is a permanent bump. Alternatively, none of the user-provided bumps exists on the path P1. The optical path P2 is Long information bumps are passed through, but user-provided information bumps are not. The route P is Both permanent information bumps and user-provided information bumps are passed through. Route P4 is Only user-provided information bumps are passed. FIG. 4 shows the intensity 680 reflected from the medium. The beam of nrn~830 nm is shown (qualitatively) as a function of position.

The expansion layer 104 contains a layer that absorbs light at the wavelength of the "readout" or playback beam. A first dye (r'<j') is given.

In a preferred embodiment, the playback beam has a wavelength of approximately 830 nm. It has a wavelength. The constancy layer absorbs most of the light at the wavelength of the readout beam. dyes that do not absorb light but absorb a significant amount of light at the wavelength of the "erasing" beam. Y" is given. This dye in the constancy layer absorbs a significant amount of the erasing beam. However, the expansion layer does not absorb it. This erasing beam has a wavelength of, for example, 680 to 780 nm. It is.

In a more preferred embodiment, this erase beam is also used to read out the substrate. However, its strength is significantly reduced during the read operation. More preferred embodiment , the erasing beam is approximately 10 to 15 when erasing from the medium. It operates at milliwatts, but when reading from a medium it operates at about 1 milliwatt. It will be done. Erase and read user-provided data provides two dyes in the expansion layer, and By using different wavelengths for reading and erasing, one departs from the spirit of the invention. It will be clear to those skilled in the art that this can be done without any modifications.

In the readout mode, the readout laser (including no data bumps) in the path P, ) in the persistence layer 106 and in the base layer 100 and in the extension layer 104 by an amount proportional to twice the thickness of the reflective layer 108 plus a small amount of loss in the reflective layer 108. Decrease its beam intensity. In this specification, to illustrate the loss in the reflective layer, Assuming that the losses in the base layer and the invariant layer are small, they are constant in any case. They treat it as something and ignore it.

In readout mode, the erase beam (operated at a reduced level) The beam intensity is lost in proportion to the thickness of the modified layer 106. Eliminations arising from path P1 The light level at the detector (not shown) for the beam and readout beam is: Potential or zero signal strength, i.e. permanent and user-provided data indicates binary zero.

FIG. 4 shows the intensity of the beam reflected from the medium qualitatively as a function of position. 680 Reflected beam at 830nm (erasure beam wavelength) and 830nm (readout beam wavelength) The strength of the beam is shown as a function of distance along the substratum in FIG. Route P1 The reflected beam intensity along is assumed to be the baseline or 100% level. .

If the read and erase beams are directed along path P2, this read The beam intensity is reduced below the level of path P1. In particular, the beam intensity is , by an amount proportional to twice the thickness of the expansion layer plus twice the depth of the permanent data bump. reduced. However, compared to path P1, the erasing beam along path P2 There will be no additional degradation. Readings along or below path P2 The reduced signal strength of the outgoing beam is therefore reduced to a binary 1, or permanent data bump. The signal strength of the erasing beam is the same as when 100% reflectance is observed. After the measurement, it continues to show binary 0.

If the read and erase beams are applied along path P3, this read beam The system suffers not only from strength loss due to reduced depth of permanent data bumps within the substratum. , it also suffers from intensity loss due to phase loss and light scattering due to temporary user-provided bumps.

The erased beam will also detect the presence of bumps due to light scattering and phase loss. cormorant.

Along the path P, both the reading beam and the erasing beam suffer loss due to scattering. phase loss due to temporary bumps only.

Therefore, this erase beam and read beam each have a permanent data bump or Specifies different light levels depending on whether or not temporary user-provided data bumps are present. It will be understood that it is exactly reflected. relative to the absolute level of reflected beam intensity. tests are used to determine whether information is erasable or non-erasable. obtain.

In particular, the reflected readout beam may be at a certain level (e.g. approximately 50% of the 21 intensity). ) It is understood that a permanent data bump is known to exist if: It will be done. Similarly, if the reflected erase beam is of this intensity (e.g. P, approximately 50% of the intensity %), it can be seen that a user-provided data bump exists. a certain fruit In the example, if sufficiently sensitive detection electronics are used, the reflected readings Since only one level is reflected for each of the four paths from the stray beam, Is it possible to use a single beam for detection and separation of data beams? cormorant. Furthermore, in some embodiments, it may not be necessary to separate permanent and user-provided data. unknown. Dual beams are preferred to increase data resolution. double vinyl In particular, the data frame may be slightly off-set.

Table 1 shows the qualitative reflected beam intensities, corresponding user-provided and permanent data present. It is given along with the display.

Reflection erasure, reflection readout, permanent data? User-provided beam intensity Beam intensity data? 80-100% 80-100% NON.

0-80% 80-100% Yes N.

80~100% 0~80% N mouth YesO~80% 0~80% Yes Yes* All values for reflectance are normalized to the "no data" path.

It is to be understood that the above description is illustrative and not limiting.

Many embodiments will be apparent to those skilled in the art upon reviewing the above description.

For example, the present invention primarily focuses on the use of erasable media to record user-provided information. shown with reference to but only allows for a single use of the medium in an interactive manner. However, it is clear to those skilled in the art that WORM type media can be used. will be readily apparent. Furthermore, the invention is specifically described with respect to wavelengths of light. However, it is possible to reverse the roles of these wavelengths and use different wavelengths of light. is possible. Accordingly, the scope of the invention should be determined with reference to the above description. Rather, please refer to the appended claims and provide a complete description of the claims to which such claims are entitled. FIG judged in full range, -1° Engraving (no changes to the content) 1---680 pages (erase) (2) -8300m (readout (+) Initialize to PI (2) Reduced strength FIG, 4゜ November 25, 1991

Claims (11)

[Claims] 1. a) a first region comprising non-erasable optically detectable information; b) adapted to record optically detectable second information provided by the user; A storage medium comprising: 2. The storage medium of claim 1, wherein the storage medium is a generally flat disk. , wherein the first region is vertically displaced onto the disk from the second region. storage medium. 3. The storage medium according to claim 1, wherein the second area further comprises: a) an expansion layer that expands in response to light of a predetermined wavelength; b) a constancy layer adapted to maintain said expansion layer in an expanded state; storage medium. 4. 2. The storage medium according to claim 1, wherein the first area is a base of the storage medium. layer, and the optically detectable information is a recording material such as a pit in the base layer. storage medium. 5. The storage medium according to claim 1, further comprising: a storage medium adjacent to the first and second areas; A storage medium comprising a reflective layer. 6. A method for manufacturing an optical storage medium, comprising the steps of: a) preparing a base layer having a surface; , b) a first plurality of optically detectable maps at a plurality of first locations of the base layer; It is assumed that these marks represent permanent information. c) erasable and optically detectable at a plurality of second locations on the surface; the plurality of second positions are located at the plurality of second positions; 1, the step being laterally displaced onto the base layer from the position of How to do it. 7. 7. The method of claim 6, wherein the plurality of optically detectable marks are The step of preparing in a first location is the step of stamping pits into said base layer. How to do it. 8. The method of claim 6, including the step of providing a plurality of erasable marks. Furthermore, a) providing an expansion material on the base layer that expands in response to a first wavelength; b) illuminating a plurality of portions of said expansion layer to illuminate said erasable and optically detectable complexes; Steps for preparing number marks and methods for preparing them. 9. 9. The method of claim 8, wherein the step of providing an expansion material further comprises: a) providing an expansion layer on the surface; and b) providing a permanent layer on the expansion layer. steps to take and how to prepare. 10. 7. The method of claim 6, further comprising adding a reflective layer to said plurality of first and second layers. A method comprising the steps of providing a position. 11. Record user-provided information and read permanent and user-provided information from optical discs a) a substrate substantially transparent to light of at least a first wavelength; layer and b) a plurality of pins representing the permanent information at a plurality of first locations on the substrate; and, c) said plurality of second regions on said base layer laterally displaced from said plurality of first regions; an expansion region on a layer of, the expansion layer further comprising: i) an expansion layer that expands in response to light at the first wavelength; ii) a constancy layer that maintains the expansion layer in an expanded state when the light stops; and d) said interface to said enhancement layer for providing user-provided data. e) means for providing a first wavelength of light; e) providing a readout beam to the expansion layer to means for detecting user-provided data; f) means for applying a read beam to the bits to detect the permanent information; A device characterized by the ability to