How to create a iso file from cd or dvd in linux

Create iso file from CD / DVD

• sudo umount /dev/cdrom
• dd if=/dev/cdrom of=whateverfilename.iso

Create iso file from a local directory

• mkisofs -r -o whateverfilename.iso /local_directory
  

mount and umount iso file with sudo or su

• mkdir /media/imgae
• modprobe loop
• mount whateverfilename.iso /media/image -t iso9660 -o loop
• umount /media/image
  

reference http://ubuntuguide.org/wiki/Ubuntu:Feisty/CDDVDBurning