On Feb 8, 2008, at 2:36 AM, R.S. wrote:
----------------SNIP---------------------------------------------
Gentlemen,
Don't you think, the "magic numbers" of the rewrites comes from
voodoo (or black magic) rather than from technological reasons ?
Any disk taken (stolen) from DASD array contains part of gazillion-
elements-puzzle. Without any overwrite. If you overwrite the data,
the only method to (try to) find the previous content is to use
microscope and watch magnetic domains. Try to find out what was the
previous value. More than gazillion-element-puzzle. After that, you
still have the previous excercise, that means set up array from
"independent" disks.
IMHO it is much easier and cheaper to pay someone for the data.
BTW: I would like to see *technical* justification of "15-times" or
any other number. Technical one, not "because mama said so".
--
Radoslaw Skorupka
Lodz, Poland
Radoslaw:
Some people (a lot) on this list are (or should be) concerned about
data destruction. If you are one of the few that are not concerned
now but in the future you may be asked (or involved) in such
discussions it (IMO) is always good to have at least an idea of what
is involved and the side issues that way you can make contributions
to the boss (or group). It is usual (IMO) if you make good
contribution (on the job or most places) to the issue of data
destruction you will come out ahead of the game. Quite often in the
US we have other departments that "worry" about such items and
probably the departments do not have a clue about the virtual ARRAYS
for DASD (or TAPE for that matter) and the implications for data
destruction. If you can walk away from here with at least a minimal
understanding of some of the issues you can honestly say you have
learned something new today and you (may) well be a better employee
for it.
Ed
ps: As for the number of rewrites the DOD is probably the last word
in data destruction. Although it would be interesting to hear if
HIPPAA (sp?) has one as will.
pps: HIPPAA (sp?) is a US concern about medical information privacy I
would suspect the EU has standards as well. Off the top of my head I
do not remember if Poland is a part of the EU, it may happen in the
future.
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