Pi-Tricks - Using DD

pi-tricks--dd.sh

# list disks
diskutil list

#unmount disk
diskutil unmountDisk /dev/disk3

#get data
dd if=/dev/disk3 of=/path/to/file bs=32m
dd if=/dev/disk3 		  bs=32m | pv -v -s 3000m | dd of=/path/to/file bs=32m

# write data
dd if=/path/to/image 		  bs=32m | pv -v -s 3000m | dd of=/dev/disk3 bs=32m

# zipped read
dd if=/dev/disk3 		  bs=32m 		  | gzip -c diskimage.img.gz
dd if=/dev/disk3 		  bs=32m | pv -v -s 3000m | gzip -c diskimage.img.gz

# zipped write
gunzip -c diskimage.img.gz 	  bs=32m		  | dd of=/dev/disk3 bs=32m
gunzip -c diskimage.img.gz 	  bs=32m | pv -v -s 3000m | dd of=/dev/disk3 bs=32m