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If the drive is not mounted, theOk now can you do a
dd if=/dev/zero of=/dev/da0with a drive that you don't have a backup of the data (assuming it is an usb external that is named da0, rename with what you have), of course do not mount it. I am not interesting to test it myself since I care about my data. Your answer make no sense since I was talking about accessing the raw devices not the filesystem.
ddcommand is not going to work, and the raw device cannot be accessed, either. Output from
ddwill be redirected to stderr(4) in that case.