What does CRC error mean?

  • Thread starter Thread starter Lars Netzel
  • Start date Start date
L

Lars Netzel

Hi

I get CRC-errors when I do System.IO.File.Copy from a dvd-r disc to a d:
drive. It works on many computers but not this one laptop.

best regards
/Lars Netzel
 
Lars said:
I get CRC-errors when I do System.IO.File.Copy from a dvd-r disc to a
d: drive. It works on many computers but not this one laptop.
Click to expand...

Can you copy the files manually?
Does it work with a different DVD?
Does it work after you use a lens cleaner in the drive?

Andrew
 
This is something like a Cyclic Redondancy Check i.e. a calculation on
written bytes (and the result itself is written). At read time, the
calculation is performed again and if the result is not the same, this is
because the bytes you read are not those who were written.

So basically it would mean that for some reason, you can't read correctly
the file back (damaged support or whatever, as it doesn't work here with a
particular machine, the drive might be a bit more sensible to external
conditions).
 
So.. this error happens AFTER the file is actually copied? and the error can
be either...somethinr wrong with the written file... or.. that the reading
of the original fails when doing this check?

/Lars
 
Lars Netzel said:
So.. this error happens AFTER the file is actually copied? and the error
can be either...somethinr wrong with the written file... or.. that the
reading of the original fails when doing this check?
Click to expand...

From my experience I'd say it's more likely that reading the CD failed.
 
OK, that actually makes sence since we got ahold of a bundle of really
crappy DVDs this time.

Thank you!

/Lars
 
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