1. find out where your dvd/cd drive is mounted then:

cat /proc/sys/dev/cdrom/info;

CD-ROM information, Id: cdrom.c 3.20 2003/12/17

drive name:		sr0
drive speed:		24
drive # of slots:	1
Can close tray:		1
Can open tray:		1
Can lock tray:		1
Can change speed:	1
Can select disk:	0
Can read multisession:	1
Can read MCN:		1
Reports media changed:	1
Can play audio:		1
Can write CD-R:		1
Can write CD-RW:	1
Can read DVD:		1
Can write DVD-R:	1
Can write DVD-RAM:	1
Can read MRW:		0
Can write MRW:		0
Can write RAM:		1

umount /dev/sr0; # umount the drive
dd if=/dev/sr0 of=/where/the/iso/goes/name.iso; # copy the dvd/cd to a file
eject /dev/sr0; # eject
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