On 10-03-02 20:24:03, Andre Robatino wrote:
Tony Nelson wrote:
That test often fails due to a kernel issue, making good media seem bad. I prefer to compare the bits with:
# cmp /dev/dvd /path/to/iso
If the dvd matches the iso: if there is no kernel issue there will be no output; else it will complain about eof on the iso file. If the dvd does not match the iso, there will be a specific complaint about the first mismatch.
Reading /dev/dvd in general is not reliable since depending on the hardware, it may not read exactly the right number of bytes (hopefully, it will at least read >= the right number, which means your command would either give an EOF error if the number was greater, or say the files are identical if it's the same).
...
Reading will never return more than the requested number of bytes. It may read past the desired end of a CD or DVD. With that in mind, read what I wrote above. If you don't understand it, ask a question.