Questions tagged [dd]

Ref

• dd man page

Examples:

• Clone the drive sda onto drive sdb:

  `$ dd if=/dev/sda of=/dev/sdb`
  

• Clone the drive hda onto an image file:

  `$ dd if=/dev/hda of=/image.img`
  

• Copy a CD or DVD disc to a .iso image file, first unmounting the disc: sudo umount /dev/dvd-device

  dd if=/dev/dvd-device of=dvd.iso bs=2048 conv=sync,notrunc

  # dvd-device will typically be dvd for a dvd disc or cdrom for a cdrom disc.

• Clone a hard drive to a zipped image file in 100Mb blocks:

  $ dd if=/dev/hda bs=100M | gzip -c > /image.img

• Create a 10 KB file filled with random data (10 x 1K blocks):

  $ dd if=/dev/random of=random.bin bs=1024 count=10

• Completely wipe the hard drive hdz by overwriting it with random data:

  $ dd if=/dev/urandom of=/dev/hdz

• Create a boot floppy:

  $ dd if=boot.img of=/dev/fd0 bs=1440