I have been trying to make an iso of some dvds, an cdroms by just copying the file /dev/acd0c, but most of the time it seems to fail with an i/o error. I underestimated the size of a 6G dvd and ran out of disk space before it was through, though it got to nearly 4G. After freeing enough diskspace an trying again I couldn't copy more than several hundre megs before it got an i/o error. Removing and reinserting the dvd doesn't seem to help. I can successfully copy the dvd by mounting it and copying all the files, but I'd prefer a straight copy of the iso image. I've had various problems doing so with different cd/dvds, and I also had a similar problem on linux. Since some cd/dvds work fine, and I can always successfully read it when it's mounted, why don't all cd/dvds allow a straight copy of the iso image?
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