MrDVD
Deactivated User
124 Posts
1/01
|  Posted - Jun 16 2001 : 2:32PMHello I had receive a DVD movie that I purchase and when looking at the seal i notice a bubble look shape like
a spare starting from the center out . When i gently touch that area, it feel smooth, but it look like a bubble. But the DVD play okay.. I remember someone writing about if you see a coffee stain, that well cause problems play a few years of the
life of the DVD , because of the seal wasn't done right. My question is this a bad DVD seal? Well i have problems playing this DVD movie in a few years ? MRDVD  [Link] |
Planet Sex
Deactivated User
1951 Posts
6/01
| Posted - Jun 16 2001 : 3:01PM
Maybe. This kind or problem, dubbed "laser rot"(*) , was fairly common in the LD days. I'll do some research and come back with more info.(some minutes later) Here. Check this: Click here ............................. (*) Laser rot is a condition that affects laser discs, the deterioration of the aluminum layer due to oxidation. The laserdisc develops spots and speckles all over it that make it worthless in value and impossible to view (either the audio will cut out or the video will skip, or both).
The large size of laserdiscs make them flexible, so that movement along the bond between the sides can break the seal, allowing moisture to set in. The glue used to attach both sides of a laserdisc together can also eventually eat away at the recorded material. DVDs are much more smaller and rigid. Also, DVDs are molded from polycarbonate, which absorbs about 10 times less moisture than the PMMA used for laserdiscs. This makes DVD resistant to the laser rot inherent in laserdiscs.
Edited by - Planet Sex on Jun 16 2001
 [Link] |
M.B.
Senior Member
1679 Posts
2/01
| Posted - Jun 17 2001 : 4:15PM
Do a search in the newsgroups, type in the search engine "dvd rot" and you will get tons of info from people who have had a problem with defective discs. It could be a few years before we know the full extent of the problem (if there really is one). As far as air bubbles go, I have a few discs with what looks like an air bubble near the center of the dvd as well and they play fine, for know.
I have read that if your disc is 3 or 4 years old and still plays fine, it will be okay for good.
It is my understanding that most of the discs that turn up having dvd rot or air bubbles that affect the disc are dual layer discs, meaning that when the lyers were glued together during production, the layers did not stick together very well and air got trapped inbetween the layers which would then cause problems later.
If you disc plays fine right know, don't be too worried about it. However, I have a sneaking suspicion that in a couple of year ther will be a lot of angry people that have a bunch of discs that don't work anymore.
Two mainstrean discs already are known to have major porblems with the dual layer dvd, those two titles are Contact and The Matrix, there have been a lot of people who got good copies of these two movies, only to find them slowly erode to the point where they can't get past a certain point in the movie because of the layer problem[Link] |
Planet Sex
Deactivated User
1951 Posts
6/01
| Posted - Jun 17 2001 : 4:24PM
A have CONTACT R1. Watched it at least 3 times (one for each audio commentary) and, since it's a used one bought from a video RENTAL store, I suppose it was watched lots and lots of times before. There are even some little scrathces in it, but so far it worked fine. And it DOES have those weird "coffee stains" in it. My player is a Pioneer DV333.[Link] |
MrDVD
Deactivated User
124 Posts
1/01
| Posted - Jun 17 2001 : 4:27PM
Can DVDs have laser rot?Laserdiscs are subject to what's commonly
called laser rot: the deterioration of the aluminum
layer due to oxidation or other chemical change. This often results from the use of insufficiently pure
aluminum during replication, but can be exacerbated
by mechanical shear stress due to bending, warping
or thermal cycles (the large size of laserdiscs makes
them flexible, so that movement along the bond between
layers can break the seal). Deterioration of the data layer
can be caused by chemical contaminants or gasses in
the glue, or by moisture that penetrates the acrylic substrates. Like laserdiscs, DVDs are made of two platters glued together,
but DVDs are more rigid and use newer adhesives. DVDs are
molded from polycarbonate, which absorbs about ten times
less moisture than the slightly hygroscopic acrylic
(PMMA) used for laserdiscs. It's too early to know for sure, but DVDs will probably have
few laser rot problems. There have been reports of a few
discs going bad, possibly due to poor adhesive, chemical
reactions, or oxidation of the aluminum layer. See www.mindspring.com/~yerington/. Edited by - mrdvd on Jun 17 2001 [Link] |
| |
|
TheBaron.net
Member
www.thebaron.net
61 Posts
6/01
| Posted - Jun 18 2001 : 1:14PM
I've have ALOT of DVD's pass through my hands and NEVER heard of anything like that on a DVD. I've seen it on laser disks which are manufactured differently.Im not making accusations of the store that you bought the DVD from, but you might want to look at the authenticity of the DVD. Meaning, it might be a fake produced in China. Overseas they pirate tons of DVD's but the production is very poor. The colors on the DVD covers are faded and washed and you can see individual pixels of color. The DVD's often have a gray discoloration to them, like a water stain, but they work fine. Of all the movie studios Ive seen, none are really that bad. Even the cheap DVD titles that sell for $5 are produced pretty good. If you just bought it, why not just return it for an exhange?
Posted by John D.
[Link] |
Duke Dasterly
Member
Beautyful Downtown Chatsworth
21 Posts
6/01
| Posted - Jun 18 2001 : 6:40PM
Since Pioneer says life of a DVD should be 100 years ,I doubt many of us will be around to find out,but more likely something will come out in 10 years or so that will make DVDs like 8-tracks.Duke D. says,Spruce and Jagermeister Rule!! [Link] |
MrDVD
Deactivated User
124 Posts
1/01
| Posted - Jun 18 2001 : 9:22PM
the name of the dvd is called
Easy Ride Her Sale Price: $5.95 I bought it from [link removed: Site is gone] tho found the link threw ADT.. under 6 dollars under. I had called them, tho they seem to be not concern about my problem. They told me it was the
manufature problem. On the other hand i am not very happy with Xonair.com , because i also bought The Adventures of Pee-Man 2, tho
they had sent me the correct cover, tho the DVD inside is the wrong movie. The movie in the box was Adventures of
pee-man 1. Xonair.com did sent me another copy , but with the same problem again.
I had told them to check there stock. They did, and they found out the manufature put the wrong cover
on the dvd . I hope everybody who order from them check to see if they got the correct DVD inside., but i dought it, because
they had sent me two wrong movies. From this experiance i well not order from Xonair.com anymore. MRDVD
Edited by - mrdvd on Jun 18 2001
[Link] |
dvdman101
Member
somewhere?!?!
17 Posts
12/00
| Posted - Jun 18 2001 : 10:33PM
DVD's can and do get "Laser Rot", whoever says that it doesn't exists doesn't know what they are talking about. It's not very common though, because the technology has gotten a hell of allot better over the last ten years. Even at the end of the LD era the "Laser Rot" problem was almost, but not, completely a thing of the past.[Link] |
