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Physically failed CD-R discs - images?

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Physically failed CD-R discs - images?

Postby Halc on Fri Dec 12, 2003 10:08 am

I'm calling out to all CDR Labs users who still have some of their failed cd-r discs available.

I need images, preferably high resolution, that show some common problems:

- holes in the reflective layer (oxidisation)
- fungus growth
- peeling-off of the label side and refletive layer
- very bad scratching of reflective side
- extreme asymmtery, thickness variations, bending
- severe changes in color or reflectivity
-

I'm finally starting to write my cd-r quality article (long in preparation) and I would need images for this kind of article.

Many people do not understand what are the possible perils that can hit that one back up cd that they hold dear. As always, an image speaks worth a thousand words...

So, if you have discs like these available, can you please post in this thread or mail me directly at:

cdrtest@surfeu.fi

If you are unsure about what kind of images I'm after, don't hesitate to ask.

Thanks for al the help in advance!

Cheers,
Halc

PS I had some really delicious discs that I unfortunately have long since gotten rid off: Kodak Gold's which peeled off by themselves. Some no-names that had multiple holes in the reflective layer as if shot with a miniatyre shotgun, discs that changed color and so forth. Now I feel stupid for not having saved them initially. Ah well...
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Postby cfitz on Fri Dec 12, 2003 10:27 am

How is this?

Image

More details may be found here.

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Postby Halc on Fri Dec 12, 2003 11:17 am

A very telling image and accompanying explanation, cfitz!

Could you provide me with a high resolution scan of that?

Thanks!
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Postby cfitz on Fri Dec 12, 2003 12:05 pm

Halc wrote:Could you provide me with a high resolution scan of that?

Good question. When I get some time later I'll take a look and see if I kept the original full resolution photo.

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Postby dolphinius_rex on Fri Dec 12, 2003 12:08 pm

I had some BASF CD-Rs do the exact same thing (made by CMC)...oddly enough though, most of them continued working for a while, despite discolourization :o

But they are ALL dead now. That was from 1997.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R

The Progression of Computer Media
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Postby cfitz on Fri Dec 12, 2003 5:17 pm

Halc wrote:Could you provide me with a high resolution scan of that?

Here you go:

http://mywebpages.comcast.net/cfitz771/ ... G_2754.JPG

Please let me know once you have downloaded it so I can remove it from the server. It takes up a lot of space.

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Postby dodecahedron on Fri Dec 12, 2003 6:25 pm

definitely hi resolution! :D
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
-- JRRT
M.C. Escher - Reptilien
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Postby aviationwiz on Fri Dec 12, 2003 7:14 pm

I put it up on my server so it can stay up:
http://tasman.lrehosting.com/photo/cfitz1.jpg
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Postby Halc on Sat Dec 13, 2003 7:32 am

Thank you very much! That's a great image and has plenty of resolution.

If anybody has more images, keep them coming (you can also send them to me as attachments, if you can't upload them).

Thanks!
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Postby RJW on Sat Dec 13, 2003 9:23 am

Expect some stuff from my hand soon.

(Some pictures of CMC disc's which were put outside on a suny day and some which didn't encounter this torture !) (OUCH))
Note I also have one of the MCC disc's which experienced the same but this one doesn't show any degradation in analyzers or at eyeball analysis.

Also would it be interresting for the article to put up a DVD disc which shows suspence or a air bubble in the policarbonate of the inner ring.
It isn't a cd-r still it could be nice for explaining shatering effects.
(To the people interrested it's made by CMC and it's branded as Memorex. The media can be burned fine and it's quality according K-probe and a Datarius analyzer is quite good but the main problem is that I'm quite woried that it will scatter at high speed reading !

You should have said this a month ago befor I cleaned up the room. SInce I trew away quite some junk disc's with damaged layers. Still I found one unburned That's write and maxell disc with a quite bad upper layer. BUt I had even worse disc form MMORE(plasmon), That's write(Lead data), HEMA(Acer)

I also have a Double diamond Digital disc which top layer is discoloured
by humidity still the disc is fine (C1 average is 1 at full speed in cddocter )
So I don't think this one is really interresting.
Just fixing the scanner at the moment. After the other scans which I promised I will put the disc's under the scanner and scan them !
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Postby cfitz on Sat Dec 13, 2003 11:22 am

Halc wrote:Thank you very much! That's a great image and has plenty of resolution.

You're welcome.

And aviationwiz, thanks for your help as well. Halc has the image now, so you don't need to keep it on your server any longer, but you may if you want. I'm removing it from mine.

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Postby Halc on Thu Dec 18, 2003 4:41 am

My apologies for a shameless bump up, but...

Has anybody got any images of their failed CD-R discs?

Please chime in this thread or send me e-mail at tha above listed address.

Your co-operation is much appreciated.

Thanks!
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