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The Saturday 2007-02-17 at 15:46 -0600, Dennis J. Tuchler wrote:
> I have seen advice on listservs not to back up to a CD ROM. I never
> understood why. Why is it a bad idea to use CDROMS as storage media?
Do you have a link? Such a statement without explanation is... well,
confusing, as you yourself show.
A CD is too small nowdays, that could be a reason, but DVDs are more
reasonable - still, you can imagine backing a 500 GB HD to... what, 100
DVDs?
Uau.
Even so, it is the easiest media we can get.
Some people backup to an external HD.
There is another reason: reliability. A problem when burning a DVD can
render it completely useless, you can't go back and burn again a sector.
Then, they can fail later on, become damaged. It seems they degrade on
their own.
A good backup media would have to use error recovery methods: not error
detection, but error correction, it is different: on the byte and sector
levels. I hate to mention that I still have in a box a few backups made
around 1990 in something like 80 old style floppies, and those backups are
fully retrievable (because the program corrects the errors). And it runs
on old plain Dos...
I would love to see something like that in Linux. It means a different
formatting method than iso, for instance.
- --
Cheers,
Carlos E. R.
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