In the CD and DVD replication procedure, after the glass master copy has been made and is prepared to be replicated, a replicating machine is then put to use to produce the number of copies required. The replicating machines are very prompt in their work. They can mould discs at a speed of 900 per hour.CDS are composed of polycarbonate. These are molded at ease as they are melted at low temperature. The CD and DVD replicating machines initially dry the polycarbonate at a temperature of 130 degrees. After this the disc is vacuum fed and placed into the injection chamber. It is then heated to its melting point 210-320 degrees. After this, it is injected into the mould that has the data print. Once it is full. Water is passed over it and the disc becomes solid. The data is however intact in it. The disc now goes through a process called sputtering.The ultimate stage of this CD and DVD replication process is to add a protective layer to the reflective side to avoid corrosion. A lacquer is applied to the disc. A spin coater machine is used to apply this lacquer. This lacquer gives protection without disturbing the reflective properties of the data side. Then a UV lamp is used to remove the lacquer and this is done very fast. The intensity is high to achieve quick results.So we see that the CD and DVD replication machines are very important parts of the entire replication process.

The process of replication is easily mistaken for duplication, which is concerned with burning blank compact or digital versatile disks. This confusion is probably fuelled by the fact that the results of the two processes are more or less similar. However, the key difference between the two is that replication involves moving of non-original data from one source to a CD/DVD, thereby creating duplicates. Replication is also undertaken by authorised companies and brokers, while duplication does not involve such a restriction, it can even get done on a personal computer.The process is preceded by an examination of firstly, duplication. It is followed by that of moving from the source, called glass mastering, which is in turn used in the creation of the mould, called the stamper. Substances containing polycarbonate are then merged with the stampers, thereby creating discs.The next step is a crucial one; the validity is established by ensuring there are no unreadable portions.The process itself is begun by formatting and arranging of the data; the pre-mastering stage. Then follows the mastering stage, which is basically about getting ready for replication of both or either audio and audiovisual data. Electrolysis occurs after stampering, through immersion into nickel sulfamate. Prior to the pressing procedure, the mould is washed, dried and protected with a film. It is also smoothened and shone. Thereafter, the moulding stage takes place, as previously mentioned, through the injection of the polycarbonate.The last step is the pressing and printing of the file.

Today in memory storage systems, the Digital versatile discs (DVD) and Compact discs (CD) are the top most used between the people for storing their files and important applications, movies, etc, whatever they want. And the DVD’s and cd’s have the great part in media field especially in video distribution. They are very much used by software companies for distributing the software’s as same as the master copy all over the world. For this type of distribution, a process called Replication is used.The Replication of DVD or CD is the process of manufacturing or pressing of a disc from its master copy such as cloning. It is not the duplication processes like copying or burning the DVD or CD from one to more copies. This is the main difference between replication and duplication process. The replication process is done by using a glass master. It is nothing but the copy of the original master used to replicate. After the glass master is made Stampers are used to press out the disc using molding machines. After verification, the discs will be printed.The replication of DVDs and CDs are very useful in the production of error free discs. This process is very much useful for media and Software companies to satisfy their customers with their high quality of disc as it appears as their master copy. There is no need of compromising with quality. The DVD and CD replication produces a reliable and durable disc than any other. It is cost effective also.

The replication process of DVD/CD can be easily mistaken with the DVD/CD duplication. Technique and practical use are the main factors that difference these two processes.The duplication process means to do a simple copy of the original DVD/CD. This would work very well if you need up to a thousand copies, but if you need more than that you should use replication process to multiply your original DVD/CD. Through the replication process, it’s created an exact copy, or a “clone”, for your original DVD/CD.Also, the technique used in the duplication process might not have the best results. A certain brand of DVD/CD player might not be able to read your duplicated DVD/CD. Using the replication process to create copies for your DVD/CD, they will work on any numbered of players.The machines used to replicate DVD/CD use a Glass Master manufacturing process, witch means that a Glass Master is created from your original master. Then molds will be made from this Glass Master. These molds can be considered as blueprints for the DVD/CD replication process. The molds are mounted into a high tech mold machine that will create replicas of the mold in the form of a plastic disc, which then will be coated with a micro-thin reflective layer of aluminum. This layer will allow DVD/CD to be read by players. The final part of the process is to apply a protective lacquer that is spun on the disc and hardened with the use of ultraviolet light.