[mdlug] Erase hard drive

[R. Kannan]

I was looking at this article

http://www.redhat.com/magazine/026dec06/features/tips_tricks/

and it says that there are 'newer, more advanced, techniques make it possible
to retrieve data that was replaced with a bunch of 0'" after issuing the
command

dd if=dev/zero of=/dev/sdb

How is it possible to 'read' data that has been replaced with zeroes??

Raj

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