cyclic redundancy check

[Guest]

Whenever I copy files from a CD-RW to my hard drive I get an error message
that says "cyclic rendundancy check". I usually get it with CD-RW discs when
my CD-ROM drive is slow, but now I get it with CD-R's on my 48x CD Burner.
I've copied the files before with the same CD and today that error came up
again. What does this mean?

 

[Tritium]

Whenever I copy files from a CD-RW to my hard drive I get an error message
that says "cyclic rendundancy check". I usually get it with CD-RW discs when
my CD-ROM drive is slow, but now I get it with CD-R's on my 48x CD Burner.
I've copied the files before with the same CD and today that error came up
again. What does this mean?

The error message pops up because the checksum for the
copied files is different from the original. One typical
cause would be the media being used for the burning. The
next most common fault would be dirty lens(es), for both
burnig and reading in the CD-RW machine or reading in the
cdrom reader.

 

[Guest]

What does "checksum" mean? And is there any way to recover the files from
the CD, because I cleaned my burner with a laser lens cleaning disc and still
got the cylic redundancy check error.

 

[Colon Terminus]

Your CD media has gone bad on you.
Search Google for "badcopy".
It's free and it'll help you retrieve most of your data.
Chances are, though, that some of your data is irrevocably lost.

 

[GHalleck]

What does "checksum" mean? And is there any way to recover the files from
the CD, because I cleaned my burner with a laser lens cleaning disc and still
got the cylic redundancy check error.

The "checksum" is one mechanism by which an error is
detected. An algorithm is used to generate a value for
the original file and this value is checked against that
of the file copy. If the values between the two do not
match, then the copy supposedly contains an error or
the extraction of the file copy contains an error. To
verify how good is the copied file on the CD-R, test it
with another machine.