Ubuntu - 3 tricks to copy DVD into iso file

Built in command

cat /dev/sr0 > /home/Documents/mydisk.iso
dd if=/dev/sr0 of=/home/Documents/mydisk.iso

If both cat, and dd not work because of '/dev/sr0': Input/output error
If I run dmesg, I recieve a lot of Buffer I/O error on device sr0

Try ddrescue in Ubuntu the package is gddrescue

sudo apt-get install gddrescue
ddrescue --direct --block-size=2048 --no-split /dev/sr0 /home/Documents/mydisk.iso

Now you can open iso file with VLC