On Thu 15 July 2004 16:50, Ashish Rangole wrote: > I usually calculate the md5sum of the iso image before > writing it to the disc. After successful write I use > readcd to read the iso image back, calculate its md5sum > and compare.
But that doesn't give you any quality information does it? And that was what you were asking about? From the readcd manpage: -c2scan Scans the whole CD or the range specified by the sectors=range for C2 errors. C2 errors are errors that are uncorrectable after the second stage of the 24/28 + 28/32 Reed Solomon correction system at audio level (2352 bytes sector size). If an audio CD has C2 errors, interpolation is needed to hide the errors. If a data CD has C2 errors, these errors are in most cases corrected by the ECC/EDC code that makes 2352 bytes out of 2048 data bytes. The ECC/EDC code should be able to correct about 100 C2 error bytes per sector. If you find C2 errors you may want to reduce the speed using the speed= option as C2 errors may be a result of dynamic unbalance on the medium. If it finds a lot of C2 errors, quality is low, if not, quality is high. Unless I misunderstood your question... Lourens -- GPG public key: http://home.student.utwente.nl/l.e.veen/lourens.key