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Old 12-03-2006, 04:30 AM
Arthur T.
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Default Freespace wiping timing

On a Win2k system, I recently did a freespace wipe on one of
my disks. I used a wipe scheme of 2-passes of random data and
Bestcrypt's software (V7.10.2).

The first pass wiped at about 5MB/second. The second pass
wiped at about 15MB/second - three times the speed. The second
pass was not only reported as being faster, it actually ran in 1/3
the time.

Since I also wiped the directory, it's difficult for me to
see what's actually on the disk. DriveRescue cannot find any
non-zero-length files to restore.

I would appreciate any theories which would explain the
differing speeds. My own guess is that it has something to do
with caching, but (while I can't find it in the docs) I think it's
supposed to take care of that. I've tried the STFW step, but I
haven't found anything.

(I was also going to ask for a pointer to software to let me
see the unallocated space on my disk. However, after running a
wipe fileslack on a file, it seems that after all of the other
passes, it the sets the area to zeros. I can't find that in the
documentation, either.)

--
Arthur T. - ar23hur "at" intergate "dot" com
Looking for a z/OS (IBM mainframe) systems programmer position

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Old 12-16-2006, 09:40 AM
macarro
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Default Re: Freespace wiping timing


> I would appreciate any theories which would explain the
> differing speeds. My own guess is that it has something to do
> with caching, but (while I can't find it in the docs) I think it's
> supposed to take care of that. I've tried the STFW step, but I
> haven't found anything.



My theory is that the second deletion pass was quicker because the
random data used to overwrite it is less complex than the first, you can
check if that is the case by wiping some small file and checking if the
second pass is quicker again, that would indicate that the second pass
always has this behaviour.

To try recover your delete data you can try:

http://www.pcinspector.de

Free


--
mapping the internet 24/7 http://www.netdimes.org

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