Dell is right! Essentially the hard drive must be destroyed to ensure complete destruction of the information
Bob,
That's not entirely correct. Whenever a HD is formatted there's two ways it can be done. The first method is a high level format which will appear to erase all the data but in reality all it does is erase the access path, the data still exists but it written over as the user installs more software on the HD. A low level format on the other hand completely wipes the HD clean rewriting to the tracks and sectors of the HD.