On Apr 4, 2009, at 11:32 PM, Kyle Hansen wrote:

> The magnetic signal written to a sector can be read (remnants of it)  
> even
> after writing zero’s to it more than 10 times.  It is just more  
> difficult
> and takes more time.  What they do now is layer the zero writes and  
> follow
> the patterns under them. Similar to digging in sedimentary soil.

Perhaps, perhaps not.

<http://dbdev2.pharmacy.arizona.edu/miscjunk/wright_etal.pdf>



-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs



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