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cp /dev/sda /dev/sdbor (pv /dev/sda > /dev/sdbto get a progress bar) would be a lot quicker. Why would you useddhere?ddwould only be useful with things likeconv=sync,noerrorto handle disks with errors, but even then it would make more sense to use things likeddrescueinstead (see alsopv's-Eoption).catmay be even quicker but the difference isn't that dramatic (maybe bigger for device-to-device than file-to-file as in my experiment).ddpitfall #1