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My task is simple:

I need to able to delete the whole root which i can do with rm-rf ./* but the problem here is HFS recovery can get back the data since it is not actually deleted from disk

if i use shred, how can i shred whole disk.

How can i combine this two commands and make it work? even is it possible? is there some chance still data can be recovered ?

Is there another way of filling the files with zeros or unwanted data (instead of shred) and then do a rm -rf ?

Any help is appreciated.

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If you want to delete everything on the partition (as I assume from you saying "delete the whole root") you can run shred /dev/sdXY where sdXY is the device you want to wipe.

  • Does it delete the whole root including system files ? do we need to to use any params like force or recursive ? – user_parser Mar 20 '15 at 1:08
  • @user_parser it erases everything at the hard disk level (basically you're writing garbage to the partition), so everything will be gone. No need for any parameters like force or recursive. – Renan Mar 20 '15 at 11:41
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One approach would be to boot from some other media, such as CD or USB/SSD, so you don't have to deal with the operating system fighting against the rm.  Possibilities include any live CD that includes a shred capability, or Darik's Boot and Nuke (DBAN).

I have no association with DBAN.  I have colleagues who use it.

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