fabiolagana.net

Create a hard disk image:
 
 dd if=/dev/hda1 of=/home/hda1.bin
 
Create a compressed disk image
 
dd if=/dev/hda1 | gzip  > /home/hda1.bin.gz
 
Back up the MBR
 
 dd if=/dev/hda of=/home/hda.boot.mbr bs=512 count=1
 
Restore MBR (from a Live CD)
 
dd if=/mnt/hda1/home/hda.boot.mbr of=/dev/hda bs=512 count=1
 
Backup a drive to another drive
 
 dd if=/dev/hda of=/dev/hdb conv=noerror,sync bs=4k