Wes Hardaker wrote:
>>>>>> On Wed, 06 May 2009 12:16:49 -0600, alexander AT nautae.eti DOT br said:
>>>>>>             
>
>   
>>> DVDs are likely less reliable than any form of external disk.
>>>       
>
> a> Are you sure about that?
>
> a> I'm not using DVD-RW, just DVD-R.
>
> Ah, I didn't realize that.  I had been assuming that you were rewriting
> existing disks.
>
> DVD-R's are much better for longevity (I believe) than DVD-RWs.  That
> being said, the recently shown life expectancy of a DVD-R is somewhere
> on the order of 5 years.  [Though I don't know what percentage of failure
> they're using to define that timing mark]
>   
I believe this is actually very old data going back to the earlier CD 
days. It wasn't so much research-based but empirical; they found that 
stains had formed within the material itself and the plastic had 
developed cracks (similar to aircraft windows). These problems are 
actually supposed to have been resolved with improved media.

Still, 5 years is probably a good number to go with unless we have 
better data.
> In theory, I'd actually trust solid state drives better (like USB
> drives) more than disks or DVDs because there are less moving parts.
>   
In theory. USB sticks actually can wear out pretty fast. An individual 
flash memory cell only survives approximately 100,000 write cycles, 
which is not a lot if you think about it. Solid state disks are more 
reliable because they use redundancy and are able to detect and replace 
failed memory cells.

That's why I would probably trust a DVD more than solid-state. 
Ultimately, though, all media fails. Tapes wear out, too.

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