In order to do a verifiable write when using cdrecord I follow this sequence: 1. I first create the iso image of the data on the disk and calculate its checksum. Then I write the iso image to the CD and delete the iso image from disk. 2. Using readcd I read the iso image back from the CD 3. Calculate the checksum of this iso image 4. For verification, I compare the two checksumsI am new to growisofs and understand that it does not write intermediate iso image to disk but rather directly to DVD.
Well, you can as well generate intermediate ISO image and record it with growisofs -Z /dev/dvd=image.iso. It's even possible to generate intermediate incremental images and record them with -M /dev/dvd=image.iso. But the latter works only with sequential recordings (DVD+R, DVD-R, DVD-RW Sequential) and nothing but tricky. So tricky that I'd rather not discuss the procedure unless you [or somebody else] can be really persuasive;-)
> If I have to
write ,say DVD-R, with incremental writes what is the mechanism by which I can do the verification of each incremental write process. Can it be done in a manner equivalent to the one I described above or is there a better way?
For multi-session recordings I'd rather recommend to verify integrity of every file rather than of incremental image. It will work for all multi-session recordings, DVD+RW, DVD+R, DVD-R, DVD-RW, even DVD-RAM. A.