This might not be perfect...
by jiahui1992 - 11/9/07 10:46 PM
In Reply to: Fill it with garbage by mwooge
This solution is adequate for most people, but if someone really wants to get the data back bits and pieces might still be recoverable. This is because hard drives store information in allocation units, and if the file you're copying over the entire drive does not fill up the entire allocation unit, the rest of the allocation unit still retains old data. This part of the allocation unit that slipped the erasure is known as slack free space, and commercial data recovery programs or forensic applications can recover old data from this area of the hard drive. As allocation unit sizes vary from drive to drive, you'll have to create a custom file that was exactly the size of the allocation units in your hard drive, down to the last bit. This is overly tedious and a free program like killdisk would do a better job anyway.
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