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A friend of mine has a DVD with a crack "its a crack straight through it, about two centimeters on each side of the middle circle", he says.

I suggested toothpaste, will anything else work?

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up vote 6 down vote accepted

No it won't.

Any CD/DVD that is that structurally damaged is not suitable to put into your CD/DVD drive. Putting it risks the disk 'exploding' due to the rotation forces.

This in turn could result in your drive being rendered useless as well as your disk.

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Right, knew that. I've heard it happen to friends. Although wikihow suggested tape to fix the foil. Perhaps tape will prevent cracking? – Moshe Feb 12 '10 at 3:06
    
I highly doubt tape is going to help you once the DVD has a "crack straight through" – Dan McGrath Feb 12 '10 at 3:47
    
it's not all the way through. Sounds like extreme pressure was applied to the middle of the disc. It probably still is in one piece. – Moshe Feb 12 '10 at 5:01
    
@Moshe - also, tape will unbalance the CD/DVD, and this is bad too. – Gnoupi Aug 21 '10 at 7:05

Toothpaste will supposedly help a scratched disc by buffing out some of the surface scratches.

I think your friend is out of luck in this case...

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Is this real??? – Xavierjazz Feb 12 '10 at 2:45
1  
Yes, toothpaste does work for small scratches, but it won't do anything for a crack through the entire disc. – Sasha Chedygov Feb 12 '10 at 3:04
    
is there a certain type of toothpaste to apply? – user46941 Aug 21 '10 at 3:38

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