If you want burn dvd to iso image file or create an iso image from dvd on mac,I share you below website:
http://www.xihalife.com/blogs/entries/17715.htm

If you would rather not wait for the video (or if you would rather have something to copy and paste into your own local file), here is my summary of this video.

You need a place to mount the iso9660 file into. Or 'onto', if that is your view of mounting.

Open a terminal application, type these commands:
user@host:~$ mkdir foobu
That might not be necessary if you know of a different empty mount point.

Now, to actually mount the iso file:
user@host:~$ sudo mount -o loop -t /absolutepath/to/iso9660 foo.iso ./foobu
Password:
(or: user@host:~$ sudo mount -o loop -t ./relativepath/to/iso9660 foo.iso ./foobu). At the Password: prompt, you must enter the correct sudo password so the mount command can execute.

If you want to use the iso9660 at the commandline, type the following:
user@host:~$ cd ./foobu

There you are, in the root directory inside the iso9660 file.
Have at it!

When you have finished using the iso9660 file, again, open a terminal (or re-use the existing terminal) and type:
user@host:~$ cd ~
user@host:~$ sudo -umount ./foobu
For my distro, you must also enter the correct sudo password so that this second sudo command will execute.
I added the cd ~ part mostly for those situations where you were inside the iso9660 directory and tried to umount the iso9660... umount could fail because you, the user, might still have been inside the iso9660 directory. Similar failures of umount could occur if you were still using ANY program to access the iso9660, so be certain you close all application which were ever using files in that iso9660.

End.

Thanks ..

also if you don't like command line or anyone ...

you can use Gmountiso it's easy