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Topic: scratches from CD top into data layer (Read 4216 times) previous topic - next topic
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scratches from CD top into data layer

I know there have been mentioned a lot of techniques to repair scratches in CDs, but apparently only for the underside. The scratches coming from the top side are much more dangerous, because the protecting layer is much thinner than at the underside (unless the CD has a hard printing - that makes it less vulnerable)
So is there any way (probably not) to repair a scratch coming from the top side and affecting the data layer ? Has anyone tried/done it ?

ps: This is not to say I maltreat CDs...
I know that I know nothing. But how can I then know that ?

scratches from CD top into data layer

Reply #1 –
Top scratches usually destroy the data pits while scratches on the underside can obscure the ability of the laser to read the pits.  So, from a practical standpoint my understanding is that a top surface scratch that causes problems is not repairable.  The top layer has almost no protection (aluminum layer, a thin coating and some paint) so it is much more fragile than the underside.  I don't know how a top surface scratch could be repaired, but if anyone has done it I would love to know how.

>edit: close parens<
Was that a 1 or a 0?

scratches from CD top into data layer

Reply #2 –
The damage of these scratches can normally not be repaired.
I know about 1 or 2 tricks that might help if the scratch is tiny ...and you are very lucky  because chances that they will work are small.
The first is putting a white tape on top of the scratch. This helped me once out (only once). A second trick I heard about is vaseline. It hasn't worked for me yet.

scratches from CD top into data layer

Reply #4 –
What exactly do you mean by "tape", liekloo ? The dictionary knows several suitable meanings...
A big problem is that the CDs are not my own ones (obviously-logically), thus I have to be very careful.

Adhesive tape can destroy the whole CD. Once I put it onto a CD, no effect. But when I tried to remove it it took half of the CD with it - the part of the surface below it together with the reflecting layer there. Even worse, it affected the TOC of the CD. The CD was lost, I had to replace it for the library.

I have some adhesive made from India rubber - it can usually be removed without any harm or difference (even from paper,...) I'l  try to use this together with a bit of white paper - or something which is reflecting white but doesn't stick to the disc.

As for scratches on the underside of the disc - I usually apply a very simple method:
Until now, the reasons for difficulties during ripping have always been one or 1, 2 single deep scratches. I locate them on the CD and rub with my finger nail vertically to them. This helped me several times (almost many).
I know that I know nothing. But how can I then know that ?

scratches from CD top into data layer

Reply #5 –
Yesterday I tried a piece of aluminium foil (reflecting!), stuck to the CD surface over the scratch. It seemed that EAC had less problems during ripping, but I have to test further in order to be sure it's no placebo. (some other kind of placebo here...)
I know that I know nothing. But how can I then know that ?

scratches from CD top into data layer

Reply #6 –
Quote
Yesterday I tried a piece of aluminium foil (reflecting!), stuck to the CD surface over the scratch. It seemed that EAC had less problems during ripping, but I have to test further in order to be sure it's no placebo. (some other kind of placebo here...)
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I tried that before and wasn't able to retrieve an accurate copy ... after applying the aluminum foil, I could rip a copy in burst mode without audible glitches which wasn't possible before, though.
The name was Plex The Ripper, not Jack The Ripper