Commercial (pressed) and Burned discs, differences explained

[Craig Tucker]

This is a 12 minute video that explains the differences between commercially pressed discs and writable discs that you can burn in your CD/DVD burner, and how they are read by optical drives.

Link supplied by ligg1980

Optical Drives

Optical Drives link now working - I'm hosting it on my VideoHelp webspace / Cobra

[Psycho_Dad_Rules]

Kewl site !!!!,

Manny more technical, computer related video's available there :

http://www.upgradingandrepairingpcs.com/videos/index.asp

Greetz,

pSyChO dAd

[Guest]

So are dual layers more prone to read errors than r/rws since their data "track" is physically smaller than a burned track?

[Craig Tucker]

So are dual layers more prone to read errors than r/rws since their data "track" is physically smaller than a burned track?

No, what makes you think the data track is smaller.

[Guest]

I thought that pressing allowed for a more sharply defined "track" than burning. I though this(relative poor definition)is the reason that burnable dvd-9s are nowhere in sight.

[OmegaSupreme]

I though this(relative poor definition)is the reason that burnable dvd-9s are nowhere in sight.

burnable dvd-9s are around the corner.

https://www.videohelp.com/forum/viewtopic.php?t=209900

[Craig Tucker]

I thought that pressing allowed for a more sharply defined "track" than burning. I though this(relative poor definition)is the reason that burnable dvd-9s are nowhere in sight.

The pitch of the spiral is the same on pressed or burned discs. A dvd-9 holds more data because it is on 2 layers not because it has a finer pitch. As mentioned dual layer burnable discs are just around the corner, the difficulty with this format is being able to burn the bottom layer without affecting the top layer it has to burn through.

[thegig]

They just need to learn to write backwards

[Guest]

I though this(relative poor definition)is the reason that burnable dvd-9s are nowhere in sight.

burnable dvd-9s are around the corner.

https://www.videohelp.com/forum/viewtopic.php?t=209900

Nuff said. I thought the guy in this thread's video said that they wern't goin to be happening soon. Maybe he will see the link as well.

[Guest]

I tried several google searches for magnified views of burned/pressed dvd/cds. Any links?

[noki]

what codec do i need to view this movie correctly? the frames stop and start in Win Media Player...like every fifth frame or something. I think the file is an AVI(?) with a wmv extention.Thanks.

NOTE: never mind...just DLed media classic player and it works great.

[Cyrax9]

What surprises me is that many people dind't KNOW that Holywood DVD's are PRESSED and not burned!

Now what I don't get is what the original material is put onto BEFORE it's stamped onto the plastic layer of the disc! For instance, if you haveea DVD Movie and you stamp the plastic layer tthat's all fiine and well but what was it stamped from? A piece of metal? If it was stamped from metal, how was that mold cast? Meaning what was used to get the data into a mold?? Was the mold etched with a laser and THEN used to stamp out the plastic layer of a DVD? Basically we know that DVD's are comemrrically pressed, that the top is often labeled nicely and there's that fine layer of aluminum in them, but how do you create the mold that's used for pressing a studio-quality DVD's for movie studios?

Also, why hasn't anybody thought of DVD PRESSES for the consumer market? I mean, if your pressing a piece of Metal onto Plastic, coating the plastic with aluminum and then a laquor, couldn't that be done in a small machine the size of a printer? I mean, what would it take to press studio quality DVD's instead of urning them? Is it that much more exensive, or just much harder to do?

[freestyler]

You have to take into account the royalty fees that must be paid per disc, electroforming a stamper to press discs from (specialized fabrication), and maintaining a replication environment - there's a lot to it (and more). Current dvd manufacturing lines cost in excess of millions, and if you have poor yields caused by poor maintenance or inexperienced technicians, you're pissing away money (coasters). This was a big problem in the early days going from single layer discs, to dual layer discs, all the way to dvd 18s.