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Looks like businesskid is explaining how to make an iso image from a filesystem. The dd command has always worked well for me (except when I've run out of space on the partition into which I was trying to copy the cd)
The intended output file name "image-au.iso" suggests that the source is an audio CD. Those do not contain a normal filesystem and indeed cannot be read by dd. CD ripping tools are needed to extract the audio tracks.
An audio CD doesn't have a file system on it. Gaps between tracks are used to seperate one audio track from the next. A data CD uses a file system and the /dev/sr0 device accesses it.
Another program good at imaging data CDs is ddrescue. It will retry copying the last block if the is a problem and reduce the block size dynamically. If parts can not be read, they will be filled with zeros. An error at the beginning might still allow later data to be read.
The OP specifically says "cdrom" several times. The only, rather vague, clue that he might be using audio cds is in the example filename. At this point we still don't know what he's really working with.
Note that images of audio cds can be created, although they won't be iso9660 files, but generally some kind of bin/cue style file pair. k3b, for example, can be used to create a binary image and a separate toc file for it (I believe it uses readom/readcd as the background tool for this).