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On 05-Mar-2014 10:54 -0800, John McKee wrote:
<<SNIP>> My conclusion is that three patterns need to be written to
each sector AND the direction the heads move needs to be reversed and
the three patterns written again to ensure that data will be
unrecoverable. I am wondering if the disk sanitizer programs do
that.
I haven't any idea about the technologies behind actual sanitizing...
But to be clear, the user information I alluded to as remaining on
disks, by having used an attempt to /delete/ the data versus having used
a drive-level disk-wipe utility, is information that was never lost in
addressability to the system nor will that data have ever been
overwritten; not even once, not without at least a scratch-install per
the disk initializations that feature effects. And AFaIK not even the
disk initialization is appropriate, because IIUC, even that action does
not actually /clear/ the disks, instead doing just enough work to make
/sectors/ usable to the LIC SM, which does not require zeroing\clearing
everything. Although filling the disks with rewrite activity along with
the essentially random nature of disk write activity is going to be
fairly exhaustive, minimally any area that had been /carved out/ for use
by the LIC remains effectively untouched by such an algorithm. To
assume there will be no user information there, would be a mistake.
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