Cloning an entire drive
You’ll need two hard drives the same size, or a destination drive larger than the source drive.
Make sure no partitions are mounted on either drive. In this example /dev/hda is the source drive, /dev/hdb is the destination drive. The dd command makes an exact, byte-for-byte copy, including the MBR (master boot record):
# dd if=/dev/hda of=/dev/hdb
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