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Note that
dd
will not feedback any information until there is an error or it is
finished; information will be shown and the disk will re-mount when
complete. However if you wish to view the progress you can use 'ctrl-T'; this
generates SIGINFO, the status argument of your tty, and will display
information on the process.
After the
dd
command finishes, eject the card:
sudo diskutil eject /dev/rdisk3
(or: open Disk Utility and eject the SD card)
