How to use dd to copy bytes from a CD?

hi there,
i brunt an iso image on a cd using my macbook. i know that the burn is good (i checked md5 on linux). however when i use "dd if=/dev/disk1 of=~/file.dd" i get something different than (different md5 and, when viewed with xxd, one can see some junk bytes between the original bytes of the iso image every now and then).
what is the right way to use dd to get copy the bytes from the superdrive?
cheers

the solution i found is to change the device to disk1s0 (after unmounting).
more details:
(a) check the disk's name via: "diskutil list"
(b) unmount: "diskutil unmountDisk /dev/disk1"
(c) copy: "dd if=/dev/disk1s0 of=~/file.dd"
(d) get md5: "md5 file.dd"
(e) compare with original md5
Message was edited by: minsf2

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