If you really want to do something like this, you'd need to write a
bit of C or something that outputs 1s and compile it. You could, I
suppose, in python (or even bash) do something like
while true()
print chr(0xff)
though if you do the equivalent in C (or anything compiled) as it'll be
much faster, then
runYourProg | dd of=/dev/(yourdevice)
but I haven't a clue as to why you'd want to do this. It'll still be
slower than using /dev/zero
(unless, I suppose, you write your own kernel module to create it?)
-g
On 11/08/2010 12:41, Bill Cumming wrote:
Quick question:
With dd (and dcfldd) it's east to write "0" (zeros) out to a drive but
how can you write just *1" (ones) out instead?
On 11 August 2010 12:33, Vince Marsters <vi...@marsters.co.uk
<mailto:vi...@marsters.co.uk>> wrote:
On Wed, 2010-08-11 at 12:15 +0100, John Matthews wrote:
What about hd you are still using, but have deleted stuff on
them. Is there any way to bring that back, or even completely
delete it?
I had a program for windows when i used it, but I cant find
anything for linux.
For data recovery you can use testdisk (its in the Universe repo
for Lucid).
As for completely delete it then the only way to be 100% certain
is to physically destroy the drive but I have been informed by a
KrollOntrack employee (they do commercial data recovery as well as
commercial erasing solutions) that 3 overwrites with different
data stops them from recovering data from a drive.
Also it is important to make sure that when doing secure erases
that the bit pattern is different for each wipe (e.g. if you write
zeros on the first pass then there should be no zeros in the
second). Using one of the Gov approved schemes will usually do this.
For most home users a single random wipe will be more than enough
as this prevents most people getting at any of the data.
Vince
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