Dd

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dd is a utility to create a disk dump by reading every single block on a disk, e.g. your hard drive. Its architecture is laid out so it can do much more than creating a dump. Here is what dd can do for you:

  • create a disk backup
  • create an iso image of a CD
  • rescue a file that contains bad blocks
  • analyze your disk by displaying selected blocks
  • create your own operating system by dumping your bootloader to the boot sector