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And even then data is recoverable if the newly written data was homogenous (all 1's or all 0's). I am not entirely sure what the nuke tool does, but I think it writes with random data n-times and then zeroes it (complete format).
The inhomogenous rewriting makes a tracing of low magnetic fields useless since the original fields became overwritten with random fields several time. The random fields mask the appearance of the original erased data fields. In Unix/Linux there exist command line tools that write directly to the disk, disregarding the filesystem (e.g., dd). The tools could be used in a shell script that overwrites the whole disk with random values n-times repeatedly.
Afaik that is what the nuke tool actually does...
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