creating file by 'dd' and erasing it securely

[Vram]

On Sun, 2005-09-04 at 14:56 +0200, R.L. Reingard wrote:
> Hello Vram
> 
> was of good help your last message. thank you.
> with that i did start to do a small file of 3MB and could erase it  
> afterwards.
> then i attempted to create a realy big file of 5GB and could erase it  
> successfully too.
> creating the big file took a few minutes and erasing this 'free space' on  
> the disk took around 2.5 hours.
> great.
> regards,
> René
> 
> 


René


I am glad it worked for you..
This is how we ALL learn stuff..

People tell me stuff till I find someone who tells me in a manner I can understand.
Then I learn and now I know..

This is a GREAT list..

Take Care..
Thanks for the feed back.  It is always nice to hear.  IT worked!!  8^))

Vram










> ****
> 
> 
> > Am 04.09.2005, 00:04 Uhr, schrieb Vram <lamsokvr at xprt.net>:
> 
> > On Sat, 2005-09-03 at 20:16 +0200, R.L. Reingard wrote:
> >> Hi Lee,
> >> i do want to have a try with the idea of creating a (huge)file and then
> >> erase it afterwards so i changed the command to create a small file  
> >> first,
> >> which i could use for a test.
> >> how to understand the outcome?
> >> user at ubuntu:~$ dd if=/dev/zero of=/home/user/hugefile bs=1 count='expr
> >> 1024 \* 1'
> >> dd: ungültige Zahl „expr 1024 \\* 1“
> >> user at ubuntu:~$
> 
> > try this command:
> 
> > dd if=/dev/zero  of=mybig  bs=1024k  count=3
> 
> > vram at Aether:~/tmp $ dd if=/dev/zero  of=mybig  bs=1024k  count=3
> > 3+0 records in
> > 3+0 records out
> > 3145728 bytes transferred in 0.018741 seconds (167851988 bytes/sec)
> 
> > Result..
> 
> > vram at Aether:~/tmp $ ls -l mybig
> > -rw-r--r--  1 vram vram  3145728 2005-09-03 15:00 mybig
> 
> > Created a file of size   3125727 bytes.......
>