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Harddisk clone disk and partition - Shred, a tool to erase a harddisk

Harddisk clone

 dd if=/dev/sda of=/dev/sdb bs=32768

The bs=32256 represents one complete track of 63 sectors each with 512 bytes. This is about the optimum in my experience with the hardware I have. Omitting the bs parameter will cause dd to default to 512 bytes in each transfer and can slow down the process significantly.

Partition clone

 sudo dd if=/dev/sda1 of=/dev/sdb1

If this partition is the boot partition we need to tell this to grub.

 sudo grub

Grub will launch and give you the grub> prompt. Here, type:

 find /boot/grub/stage1

You should see something come back that looks like hd(0,0). Jot that down, you’ll need it in a second.

Now, still in the grub> prompt, type:

 root hd(0,0)

You’ll put in whatever result you go above – it may be different than hd(0,0). Once that completes, type:

 setup (hd0)

Even if you got a result that differs from hd(0,0) above. Type:

 quit

And you’re out of grub. Restart your machine, removing the LiveCD and you should be up and running on your new hard drive. You may also encounter a problem on your first boot where the system will try to scan your hard drive for bad sectors. If that fails, you’ll find yourself in a root terminal session. Just type:

 fsck

• more info: http://www.arsgeek.com/2008/01/22/how-to-clone-your-bootable-ubuntu-install-to-another-drive/

Shred - Tool om een harddisk te wissen, erase a harddisk

Overwrite the specified device/file repeatedly, in order to make it harder for even very expensive hardware probing to recover the data. Start the server with an Ubuntu Server CD and choose for a live/try Ubuntu.

Open a Terminal and type:

 shred -fuvz -n 3 /dev/{device}

• f: (force) change permissions to allow writing if necessary
  
• u: (remove) truncate and remove file after overwriting
• v: (verbose) show progress
  
• n: (iterations) Overwrite N times instead of the default (25)

NOTE: Be aware that the data is definitely lost after running this command!

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