Warp nous apporta ses lumieres en ce 2007/12/15 08:51:
>   The DVD is a bad physical form of media. It's too fragile.
> 
>   I have the 4-disc edition of Titanic, and my computer has now trouble
> recognizing the second disc. It's just a tiny scratch on the very outer
> edge of the disc, but that's enough to make it difficult for the drive
> to recognize the disc.
> 
>   There's nothing else wrong with the disc, only the tiny scratch on the
> outer edge. If such a small flaw is enough to completely stop the DVD from
> being played, that's IMO a clear sign that the DVD as a format is flawed.
> One tiny scratch should not disable the entire disc just because it happens
> to be physically located at a certain place on the disc. DVDs are supposed
> to have lots of redundant information for the exact reason to avoid it being
> rendered unplayable by tiny flaws. Why can't it have redundant information
> of the most critical sections of the disc, at different parts of the disc,
> so that drives can try another copy of the critical section if one is
> unreadable?
> 
>   This sucks.
> 
On CD and DVD, the content is writen from the center outward, and very seldom 
reatch all the way to the edge. Any scratch on the very outer edge would never 
be reatched by the reader.
This let a possibility: The scratch is realy a chiping, that chiping is 
unbalancing the disk, and the reader's spindle is loose, making the disk spinn 
off center. Try sticking a tiny bit of adesive tape on the back of the DVD 
between the center ant the scratch and see if it help.

-- 
Alain
-------------------------------------------------
You know you've been raytracing too long when you think it's a failing of the 
universe that the large software companies like Corel or Fractal Design do NOT 
export to POV primitives.
George Erhard

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