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Using dd on video DVDs gets permission denied after about 700MB

I bought three movies on DVD on eBay. I am trying to make .iso backups onto my external hard drive. The first one I tried using Disk Utility, but it only produced a partial copy (without generating ...
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how do I create an ISO/CDR file from a hard disk?

Presently I am attempting to back up my whole computer's primary hard drive to an ISO file. When I attempt to do this using Disk Utility, I perform the following steps: Open disk utility and choose ...