Pre- & Glassmastering is one of the most sensitive technologies in the audio CD production. This is the last station, where the sound quality of the final product is still a decisive influence, which happens with the use of SDG technology.

Given the ambitious targets audio edit data without quality loss none of the mastering equipment available on the market are attainable, SDG has built is own facility. It has created a special computer, which applies principles, elements and materials for future electronics and computer techniques.

In the pre-mastering phase, when the company SDG digital audio master, the obligatory DDP (Disc Description Protocol)-Image File undergo conversion, which in this distortion and low noise levels is carried out jitter SDG special-purpose computer.Then, for glass mastering the encoder to the EFM (Eight to Fourteen Modulation) for CD, DVD or ETM (Eight to Twelve Modulation) for Blu-ray Disc converted signal is filtered again, then written into the laser beam recorder on glass illuminated (Calcined ). The electronics for signal conversion and laser control technology is also SDG-master is burned to the signals in the form of an ultra-clean square wave signal on the glass. Then the metallized glass master is developed and galvanized.

Recently it has become possible with direct-to-Glass mastering by our mastering facility produced extremely clean signal to implement physically.

With the directly into the tempered glass discs etched pits, it is possible to produce grown in the pits for the optimal sampling rectangular shape. Thus the benefits of technology come with sharp edges and high slope even better coverage. The laser light reaches the photodiode steeper slopes in the output signal.

The pit structure achieved with this technology is so clean that the player can read them without a reflective layer. Only the intensity of the laser needs to be readjusted, what most players are able to do for themselves. This is especially important for long-term archiving, which can be dispensed by the reflective layer and the protective lacquer. So we can just use the glass discs. Of course, the gold-coated "traditional version is" still to choose from.

This product is the first and only media in the world, who holds up forever, "as carved into the stone."All magnetic data storage systems such as hard disks and magnetic tapes can be compared to our solution only for temporary use will be considered suitable. Most only as a backup but not as long-term archiving.

Therefore, globally, many libraries, computer centres, state and provincial archives, radio and television stations on our glass discs especially happy. The vast archives of film, video, tape or microfilm records and archives can be replaced with an unlimited durable medium, certainly saved.

Gone are the days when you had to just copy everything over again, where a fire, water or electricity damage could destroy valuable documents. Our glass discs must be done only once and accessibility, network or broadcast capability, and forgery are secured forever.

A medium is the passive, requires no maintenance, no electricity, or cooling, heat, cold, acid resistant, and completely without costs.

In the manufacture of the stamper, the feedback and requests for fine-tuning and optimisation are widely considered the in tandem working Pressing Plant companies KSP and NOD. There are then ready pressed onto disks, printed and undergo a final quality control. The discs are now meeting our quality requirements, will be packaged and delivered to the client.

It does not matter what technique is used for recording from analog tube technology to purist R2R PCM, high-resolution multibit sigma-delta, or DSD, from 2 channel to multi-channel.

The recordings are, however, in all CD players in plain stereo, without additional electronics, decoding, or any other restriction be playable. We ask in addition to the recordings (on CD-R or DVD-R) to send information about the use of technology, equipment and methods. Reason: Our SDG-master technique allows a very transparent sound with low distortion. This is also the disadvantages of possibly exaggerated corrections strongly audible. Since the consultation will be necessary. Consumer abuses that restrict the user, injure, or spy, we reject categorically.

With the directly into the tempered glass discs etched pits, it is possible to produce grown in the pits for the optimal sampling rectangular shape. Thus the benefits of technology come with sharp edges and high slope even better coverage. The laser light reaches the photodiode steeper slopes in the output signal.

The pit structure achieved with this technology is so clean that the player can read them without a reflective layer. Only the intensity of the laser needs to be readjusted, what most players are able to do for themselves. This is especially important for long-term archiving, which can be dispensed by the reflective layer and the protective lacquer. So we can just use the glass discs. Of course, the gold-coated "traditional version is" still to choose from.

This product is the first and only media in the world, who holds up forever, "as carved into the stone."All magnetic data storage systems such as hard disks and magnetic tapes can be compared to our solution only for temporary use will be considered suitable. Most only as a backup but not as long-term archiving.

Therefore, globally, many libraries, computer centres, state and provincial archives, radio and television stations on our glass discs especially happy. The vast archives of film, video, tape or microfilm records and archives can be replaced with an unlimited durable medium, certainly saved.

Gone are the days when you had to just copy everything over again, where a fire, water or electricity damage could destroy valuable documents. Our glass discs must be done only once and accessibility, network or broadcast capability, and forgery are secured forever.

A medium is the passive, requires no maintenance, no electricity, or cooling, heat, cold, acid resistant, and completely without costs.

With our program for long-term archiving, we want to connect us to the nestor competence network for digital preservation, IASA and FIAT/IFTA.

Long-term archiving with SDG-Master Glass archiving system ensures:

• 100% Data-Safety,
• 100% Revisions-Security
• 100% Trustworthiness
• 100% Compliance
• 100% Evidence-Credibility
• 100% Scalability
• 100% Online-Capability
• 100% Broadcast-Capability
• 100% Fire-Safety
• 100% Independency
• 0% Following Costs

We offer our products for long-term archiving in uncompromising quality.

Technical details about the combination of two technologies:

By SDG mastering it is about extremely noiseless and distortion-free signals in mastering digital audio and video data in the mastering equipment, as well as the laser control of the glass mastering facility.

The glass discs are made of tempered glass with direct-to-glass mastering and plasma etching. The individual pits over conventional technologies have sharp edges and a high slope. In addition, we are introducing a unique technology, the pits in a rectangular shape.

To these new features comes the low birefringence index of the glass from 2 nanometres compared to 30 nanometres of the polycarbonate. All together it gives a very clean and clear pit structure to allow the glass discs alone, are played without a reflective layer!

The course will benefit in the long-term archiving. Those discs, the reflective layer have to be able to meet we always made of gold) for the purpose of long-term preservation really for eternity, the mandatory protective coating produced by us are made of inorganic specialty materials.

Technical Features

1. It is about glass discs, where the pits are etched in the tempered glass. This means unbreakability, scratch resistance. If you fall our glass disc, nothing happens.
   
2. Applicability of -270 up to + 550 degrees Celsius. The glass discs are non-combustible, unlike all other digital media.
3. The pits have a 90-degree slope, what help secure readability at high speeds. This property is completely inconceivable for the pressed or burned discs due to its physical aspects.
4. Another special feature is that we have developed a technology with rectangular pits which once again doubled the reader security. Therefore - if we want - can be omitted even the reflective layer.
5. Our glass discs hold while reading of 36,000 revolutions per minute, which is 9 times higher than the 4000, which conventional polycarbonate discs (eg at 52x to CD-DVD read-bear).
6. The discs come with the familiar formats fully technically compatible. In the BD-s is a doubling of capacity in view, we will take.

Durability & references: Our SDG Masterglass discs have an unlimited longevity.

1. The discs were already as "Message from the Earth" with the NASA Mars probe "Pathfinder" and associated with the "Phoenix" spacecraft on Mars, where it stand keeps the local weather conditions on the outer skin of the Marsmobils in open space. This year our SDG Masterglass flies reference probe of the Japan Aerospace Exploration Agency "IKAROS" and "Akatsuki" into space toward Venus.
2. The French Academy of Sciences and Académie of des technologies in Paris have established a working group to examine the shelf life of digital media. The result is clear: there is no reliable storage medium except our etched glass discs. These go with flying colours by all aging tests. Magnetic tapes and disks must undergo constantly integrity checks and regular exchange and move. Much of the hard drives keep out less than a year. Magnetic tapes have approximately 2-year life cycle. The optical disks are the worst BD s. The academic report is available at the publishing in print format: Éditions EDP Sciences in Paris.

Use & access times:

1. Space is approximately equivalent trade tapes. The discs are used in robot controlled automated shelf systems, completely replacing the existing robotic tape shelf systems.
2. Power and database software are identical to the versions in known use no conversion necessary.
3. Up to 14 drives / 700 disc can be used for the disc cabinet systems. It means an approximately 10 x faster access than the magnetic tape systems.
4. In addition, that the glass discs must not be wound and read with 9 x higher speeds can as conventional discs.
5. Online access from intranet and internet is of course possible without changing the system.
6. Audio-visual archives can take direct broadcast operations.
7. Revision security: The content to change a glass discs is not possible. Accidentally, still deliberately. This 100% revision security is guaranteed.

Follow-up costs:

1. The glass discs are passive disk. This storage makes no claims at all, not heating, cooling or air-conditioning necessary. Fire hazard no longer exists.
2. The energy requirement when using is 10% of magnetic disks.
3. The glass discs obsolescence, which must not to be copied, nor replaced. If once purchased, there are no follow-up costs, forever.
4. The necessary integrity checks of magnetic tapes and replacements, this eliminates the necessary infrastructure.

 

Calculation & comparisons:

1. When the legacy tape archives not only the band prices but the associated entire infrastructure with drives for use, integrity, move, to personnel costs and breakout rooms as costs involved. This infrastructure must always grow with the archive, so costs grow. The glass disc does it no longer. Such costs investment may be waived. They must be made only once. Then they are simply there and forever.
2. After our current prices glass mastering that the discs would be too expensive. We can press the profound automation and capacity increase to the preferred level.
3. Our price is the sum that has costs for insecure magnetic disk with purchase and first two years. That long-term archiving expenditure would drastically lowered for our customers.
4. The goal is to rid our customers as quickly as possible of the risk of data loss and therefore arising everyday costs. Therefore a strategy of order is important, how to create the new stock and converted old stocks on glass discs.
5. Motto: No more costs from the creation of archive a glass disc; therefore it is the right choice for all archives that are longer than two years to keep this technology economically as technically.

Long-Time Partnership: all archive extensions are of course taken part.

 

Readability without drives
Common question, what if it in 100-500 years no longer have optical drives? Now this image shows how a HD disc with high-resolution scanner to be read without rotation. This property is unique, no other digital media can imitate.
The glass discs were used first in 1996 by NASA for the Mars Pathfinder, to store information on our terrestrial civilization at each target foreigners. The next NASA Mars Expedition Phoenix in 2007 also had Glass Disc here. The same process in the next Japanese space mission "Ikaros" in 2010 where the glass disc is used.
Projects: Messages from Earth Etched glass DVD with Phoenix with 250,000 names (including all Planetary Society Members) on the Mars Reference Customers: Lockheed Martin, Thomson / Thalesgroup, NASA, Bibliothéque nationale de France, EDF, France Telecom, Musée Rodin, Avantis…

 

Risk management in long-term archiving

A question of decision: long-term archiving, or sequential backup?

SDG-Master Glass is the first storage medium with unlimited shelf life, so the only usable for real long-term archiving, while all the other technologies simply work as a sequential backup. All previous studies, recommendations for regulations and standards were so far out of sequential backup. All workflow ('workfow') rules anticipate 'life cycles', that involve risks and subsequent costs. For the comparison between the sequential backup and long-term archiving, we take "Risk management in digital preservation" of Digital Preservation Coalition, DPC as a base, with some additions. These risks and how effective their management is to determine and define a long list - indeed all - of activities that the long-term conservation depends.

If we compare which of these risks have an impact on the two preservation methods of digital data.
Risk	Sequential backup on magnetic tape archive system	Long-term archiving on SDG-Masterglass archive system
Media obsolescence	risk exists	no such risk
Media degradation (also known as 'bit rot')	risk exists	no such risk
Data loss due to major fire	risk exists	no such risk
Data loss due to water damage	risk exists	no such risk
Data loss due to radioactive radiation	risk exists	no such risk
Data loss due to failure of air conditioning	risk exists	no such risk
Data loss due to magnetic fields (transformers, power supply)	risk exists	no such risk
Data loss due to electrical malfunction, power failure, overload	risk exists	no such risk
Data loss due to viruses, Trojan (also known as malware)	risk exists	no such risk
Data loss from hacker attacks, cyber-war	risk exists	no such risk
Data loss caused by acids, alkalis	risk exists	no such risk
File format obsolescence	risk exists	no such risk
Access barriers: eg encryption	risk exists	no such risk
Insufficient resource discovery metadata	risk exists	no such risk
Insufficient representative metadata	risk exists	no such risk
Inadequate control e.g. Copyright	risk exists	no such risk
Authenticity and origin is unclear	risk exists	no such risk
Multiple copies are not synchronized	risk exists	no such risk
Disruptive technologies	risk exists	no such risk
Risk factor data loss: technical dependence on manufacturers	risk exists	no such risk
Risk factor data loss: financial dependence on manufacturers	risk exists	no such risk

 

 

The time required to restore the system after a crash
Magnetic tape archive systems:	SDG-Masterglass archiv system:
The recovery of the system takes over 6 months	The archive system is immediately operational again.

 

At what costs could be waived "SDG-Masterglass" archive systems, in order to save 75% of the investment?
Expensive air conditioning, cooling is unnecessary, our systems work in an unheated and uncooled spaces. Energy costs can be reduced radically. (More radical than zero, is not possible at all)
Costly fire protection actions are no longer with SDG-Master Glass systems necessary. The glass discs and the jukebox robotic systems, (they come in custom-made) are not flammable.
Lampertz cells with the extravagant construction projects are no longer needed with SDG-Master Glass archiving systems. The archive jukeboxes filled with etched glass discs do not require special construction. These astronomical costs can be saved completely.
Routine checks of data integrity, rewinding and exchange is a thing of the past. Also on the costs of infrastructure required to get twice as unit stock, premises and staff can be eliminated completely.
Minutes wait for the network data access are not acceptable today. Our jukeboxes have drivers up to 1.5 terabytes per Archive. As if each cassette had its own tape drive. The data access speed can thus up to thirty times the tape speed can be increased.
Hardware for second copies are not needed. The two copies or backups of SDG-Master Glass discs are only mounted, guaranteed to stay unchanged, no activity is necessary.

 

Investment costs for sequential backup and long term archiving in comparison
Investment	sequential backup with magnetic tape archive systems	Long-term archiving with SDG-Masterglass Archive System
Archiv inventory on data carrier	Yes	Yes
Security copy of the archive	Yes	Yes
Hardware for's archive	Yes	Yes
Hardware for the security copies	Yes	—
Air conditioner for the archive stock	Yes	—
Air conditioner for the security copies	Yes	—
special fire protection equipment (argon-flooding system) for the archive stock	Yes	—
special fire protection equipment (argon-flooding system) for the security copies	Yes	—
Special construction, to allow fire protection and air conditioning (Lampertz cell) for the archive stock	Yes	—
Special construction, to allow fire protection and air conditioning (Lampertz cell) for the security copies	Yes	—

 

The time required to restore the system after a crash
Magnetic tape archive systems:	SDG-Masterglass archiv system:
The recovery of the system takes over 6 months	The archive system is immediately operational again.

 

Operational and consequential costs for sequential backup and long term archiving in comparison
Operational and consequential costs	sequential backup with magnetic tape archive systems	Long-term archiving with SDG-Masterglass Archive System
Energy cost of the use of the archive	Yes	Yes
Personnel costs of the archive stock	Yes	Yes
Personnel costs of the security copies	Yes	—
Energy cost of air conditioning of the archive	Yes	—
Energy cost of air conditioning Security copies	Yes	—
Energy cost of the regular rewinding of the archive	Yes	—
Energy cost of the regular rewinding of the security copies	Yes	—
Energy cost of regular check of the data integrity of the archive	Yes	—
Energy cost of regular check of the data integrity of the security copies	Yes	—
Energy cost of the regular virus scan of the archive	Yes	—
Energy cost of the regular virus scan of the security copies	Yes	—
Change of generations (new purchase) of the storage media of the archive in every 3 years	Yes	—
Change of generations (new purchase) of the storage media of the security copies in every 3 years	Yes	—
Change of generations (new purchase) of the hardware of the archive in every 5 years	Yes	—
Change of generations (new purchase) of the hardware of the security copies in every 5 years	Yes	—
Energy costs of the copying of the archive in every 3 years	Yes	—
Energy costs of the copying of the security copies in every 3 years	Yes	—

 

Archive for long term archiving	SDG-master data handling & services	SDG-Masterglass discs with / without reflective layer / automated jukebox systems
Libraries: books, documents, files, periodicals, microfilm archives, photo archives	Digitization (scanning), digital image editing, cataloging	Yes / Yes / Yes
Banking, Insurance: files, databases, on paper, magnetic tapes, disks	Digitization, cataloging	Yes Yes / Yes
Film archives: films and documentaries, film reports, collections on film, magnetic tapes, disks	Digitization, digital imaging, bug fixes, enhanced resolution. Image audio and video forensics, cataloging	Yes / Yes / Yes
Music publishers: whether digital or analog music recordings, tapes, hard drives, optical discs	Digitization, digital sound processing with extremely high signal quality, higher resolution. Audio Forensics, cataloging	Yes / Yes / Yes
Radio stations: tape recordings of music and prose, broadcasts, programs	Digitization, digital imaging, bug fixes, enhanced resolution. Image audio and video forensics, cataloging	Yes / Yes / Yes
TV companies: Program and broadcast archives on film, magnetic tapes, hard drives, optical discs	Digitization, digital imaging, bug fixes, enhanced resolution. Image audio and video forensics, cataloging	Yes / Yes / Yes
Universities, colleges and research institutes: University Libraries, measurement data, research, professional literature on paper, photographs, microfilm, magnetic tape, hard disk	Digitization (scanning), digital image editing, cataloging	Yes / Yes / Yes

Network capability with short access times through automated jukebox systems.

Programmable Broadcast-Enabled Jukebox automated systems with fast access.

The automated jukebox systems are infinitely scalable.