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Re: simple way to securely destroy deleted files in a file system

On Thu, Jul 15, 2010 at 12:05 -0400, H.S. wrote:
> I have a couple of hard disks in a computer which is to be recycled. I
> want the windows OS in it to remain functional, but I want to be sure
> that I have deleted all my personal files securely (never used the OS
> that much anyway and there is hardly any important info in its registry
> or browser). There are a number of documents that were deleted in
> Windows the usual way (Shift+del) and I just want to make them
> unrecoverable.
> Its first and second partitions (sdc1 and sdc2) are vfat. I was thinking
> of mounting these on /mnt/scd1 (and scd2) and then doing:
> # dd if=/dev/zero > /mnt/sdc1/zeros.bin; rm -f /mnt/sdc1/zeros.bin
> and the same for scd2. The idea is fill the partition with new data thus
> overwriting any deleted files' data that is lying around. Would that be
> adequate? The objective is just to prevent a casual recovery, reading
> and copying of the data by a future user, so I don't need multiple
> over-writes.

Take a look at "secure-delete" which contains "sfill" which can be used
to fill the available free space on a hd with random (and specifically
crafted) data to ensure that data recovery is impossible. I am not sure
if it works with vfat though :-\

good luck
  .''`.     Wolodja Wentland    <wentland@cl.uni-heidelberg.de> 
 : :'  :    
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