How To Copy DVD to ISO File

I'm using 8.0-BETA2 and have a SATA DVD drive.  I'd like to take a DVD 
and create an ISO file from it.  I have not done this before on FreeBSD.

I've googled and it appears it should be as simple as:

dd if=/dev/<dvd drive> of=/path/to/ISO

So I figured out that my DVD drive is seen as /dev/acd0 and verified 
that it's accessible with "mount -t 9660 /dev/acd0 /mnt".  After doing 
so, I can 'ls' files on /mnt.  Then I unmounted the drive.

So to create my ISO, I issued this command:

dd if=/dev/acd0 of=DVD.iso

But get this output:

dd: /dev/acd0: Invalid argument
0+0 records in
0+0 records out
0 bytes transferred in 0.000132 secs (0 bytes/sec)

I googled some more and thought that loading atapicam.ko might help.  
But yet I get the same error when using /dev/cd0.

So what am I doing wrong?

Thanks,

Drew

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