bit-for-bit copy of DVD on osX (or: how to generate .iso on mac)

0) Insert DVD
1) Open up terminal
2) Find out where it was mounted (diskutil list)
3) unmount it (sudo umount /dev/disk1)
4) generate .iso (dd if=/dev/disk1 of=~/dvdImage.iso bs=2048 conv=sync,notrunc)