Originally Posted by
Bear
a full recovery wipes it completely, as opposed to doing a "repair", which will, in fact, leave information ; ) chances are he doesn't have either option anyway, but it's certainly worth a look, in lieu of obtaining another full operating system disc for each machine
No a full recovery does not wipe it completely. It will write over portions of the disk that had information but not all of it.
To completely wipe a drive you must write over every sector 7 times per DOD specifications to destroy the data completely. While these standards are out of date, it's still the standard. That's why most companies Degas or destroy. Faster and cheaper.
Think of a drive like a puzzle. When it's faced up you can read the data.
Now delete the partition table and you cant read the data easily. This would be like flipping the puzzle over. You can still flip it back to read the data.
Now say you formatted the disk just once. This is like breaking up the puzzle into all it's original pieces. Much harder to put together and some pieces will be missing but you could recover money prohibiting.
Now say you installed a new OS directly ontop of the other. where the computer decided to put it on the disk would now be unrecoverable. It would be like your sister spilling paint on your puzzle. most of it's covered but you can still see some pieces.
Now comply with the DOD standard wipe of 7 pass's or 3 is more than enough with todays technology. It's like taking each puzzle piece, killing any one that's ever laid eyes on it, blacking them out with permitting marker then throwing them into the center of the sun. Point is once a sector has been written over several times it's useless to try and recover data.
Also just a note. Most formats dont delete any data. They only delete the partition table and FAL so the disk now sees that space as available to write data to again. The data still exists.
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