dd producing corrupt ISO images on Snow Leopard (whether invoked from a script or the shell)

dd producing corrupt ISO images on Snow Leopard (whether invoked from a script or the shell) Alright, I am probably being an idiot here, but I am writing an ISO-ripping util that is really just GUI slapped on top of dd, and I can't coax the thing to produce non-corrupt ISOs on Snow Leopard. I have tried the following variations (all with /dev/disk1 unmounted as it should be):
Asked by: Guest \| Views: 310

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Guest [Entry]

"Not sure what is going on, but have you tried comparing the source and target afterwards?

Maybe:

od -c source > source.txt
od -c target > target.txt
diff source target

I guess this will generate some pretty big files and I'm not sure how useful the diff output will be - but at least it should provide an answer as to whether the files are the same or not.

You running 'FileVault' or anything on your machine ? Not sure if that could affect this type of thing ?

Does the dd work with other types of binary files? (try copying '/bin/ls' to another file and see if it still works?)"