data remanence ++ drive reconstruction

"Hard disk recovery is possible because of data remanence, which means that some data continues to exist on the hard drive even after it has been deleted. While data remanence is beneficial to hard disk recovery, there is also a downside; that is, data remanence is one of the most convenient tools used in cyber-espionage..."

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"Hard disk recovery reconstructs lost files, regardless of whether they were deleted accidentally or are inaccessible due to a crashed hard drive. In some circumstances, the hard disk may become inaccessible because of a hardware problem..."

data.src:

uri: http://www.wisegeek.com/what-is-hard-disk-recovery.htm