On 01/29/2015 03:38 PM, Klaus Hartnegg wrote:
Am 29.01.2015 um 04:35 schrieb Jon Harris:
Does the bank understand that software wiping is not considered safe for
release of sensitive information? Admittedly I doubt the company
receiving the old machines would want to pay the price to recover the
"wiped" data but I am sure it could be done. It would just depend on
how much someone wanted to pay to recover the drive's data.
A few years ago I read in a computer magazine, that people tried to
restore data after just one single sweep of overwriting a hard disk with
zeroes. I think they used a atomic force microscope to find traces of
the old magnetization. No chance. Todays hard disks have very reliable
http://www.vidarholen.net/~vidar/overwriting_hard_drive_data.pdf
Overwriting Hard Drive Data: The Great Wiping Controversy
Craig Wright, Dave Kleiman, and Shyaam Sundhar R.S.
ICISS 2008, LNCS 5352, pp. 243–257, 2008.
head positioning, surface coating where the magnetic fields do not
spread much, and the erase coil is wider than the write coil. This might
be different with the brand new shingle magnetic recording, but this
cannot yet be the case for the harddisks in question here.
Another issue is: does the leasing company really want the hard disks
back? Usually they resell such PCs with new harddisks, not with the used
ones.
Klaus
