Clarify , DVDs are pressed.. NOT !

[theewizard]

Store bought dvds are pressed. A home burned disc is different.

pressed is a TERM carried over from the phonographic record industry

and refers to pressing the sheets of raw vynl with the master die that makes the sound grooves in an LP record along with the term CUT, when you cut a record the sound equipment 'cut the grooves into a record, that record was the used to make the master 'die' which pressed the LPs or 45's

while TERM has been carried over, to the dvd industry, I don't belive they use dies to cut DVDs

the laser in the player has to read the coloration changes in the DYE layers,

the layers inside the DVD have to be BURNED, it is automated and it is high speed, but it an't physically pressed, it's just done with an industrial laser burner

Will somebody in the industry, please correct any mistakes i may made OR further Clarify the process

[olyteddy]

http://en.wikipedia.org/wiki/DVD_formats read the first paragraph. http://www.dvdinfinity.com.au/dvd_replication.htm "There is a huge difference between replication and duplication when it comes to your company's image. Duplication means burning the DVD normally with using a DVD burner. Replication means creating a glass master and then using the glass master to create stampers that are used to stamp out your pressed DVDs at high speed in high volume." and any others you can Google...

[Mr. Salty]

Sorry, you're incorrect. I used to work at the Universal (now Technicolor) DVD pressing facility in Pinckneyville, Illinois, and commercial CDs and DVDs are, in fact, pressed.

A laser is used to make the disc image on a piece of glass coated with emulsion. When the emulsion is developed, the disc is etched into the glass. A metal die is made with a nickel alloy, and those dies press the disc into melted plastic, which is then coated with a thin reflective coating. With dual-layered discs, separate pressed layers are then bonded together with adhesive.

Sadly, the Technicolor pressing facility is about to close, putting hundreds of people out of work. The company is moving all its manufacturing to Mexico.

[redwudz]

Yes, they are stamped, very similar to LP records, then a protective layer is laminated over the stamped surface. Since they aren't burned, that's why they are generally colorless on the written surface, no dyes needed.

[Mr. Salty]

[quote="theewizard"]

the laser in the player has to read the coloration changes in the DYE layers

It should also be clarified that the laser is reading reflectivity, not color.