John Doe wrote: > From: chloe K <chloekcy2000 at yahoo.ca> >> What is the best practice to remove all data in the disk? >> ls fdisk ok or use dd > > Maybe something like (replace the ?): > - fast but not secure: > dd if=/dev/zero of=/dev/?d? bs=4096 > - slow but more secure: > dd if=/dev/zero of=/dev/?d? bs=4096 What is the difference between the above two commands? Did I miss something? > - n times slower but n times more secure: > for ((i=1; i<=n; i++)); do dd if=/dev/zero of=/dev/?d? bs=4096; done I don't know what "n times more secure" means. Could you please explain? Does that mean that, with n times as much work, one can still recover the information? Mike -- p="p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);} Oppose globalization and One World Governments like the UN. This message made from 100% recycled bits. You have found the bank of Larn. I speak only for myself, and I am unanimous in that!