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Technology Stocks : Compaq
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To: rupert1 who wrote (43436)1/13/1999 1:16:00 PM
From: TigerPaw  Read Replies (1) of 97611
 
Is it removed, distorted or suppressed? (Erased Data

One analogy of recovering erased data can be shown by holding two sheets of copier paper (with writing) up to the light, one directly in front of the other. You can still see some of the bottom sheet through the top.

Another analogy is to take a broad magic marker and draw a straight line on a piece of paper. Now take a different colored marker and quickly draw over the same line. Notice that some of the original color can usually be seen at one edge of the line or the other.

There are magnetic pickups which are more sensitive and precise than the usual disk read heads. These can look at the edges of the tracks and also detect residual magnetism to recover written over data. A security erase usually involves writing random patterns over and over and over hundreds of times to mess up these effects.
TP
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