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This will completely erase everything on your hard drive and is not reversible.
There is 1 alternative - vote for the best!
If you leave out the block size it defaults to 512 bytes. I set it to 16 Megabytes and it was much faster...
If you can do better, submit your command here.
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This is in fact a useful command, and often used when giving away or scrapping computers. But doing this while the system runs from a partition on /dev/hda will probably lead to some sort of kernel panic, and the command will be interrupted before the whole disk is erased. I'd recommend running it from a bootable CD like Knoppix, or at least set the system into single user mode with "telinit 1" first.
And yes, doing it only once should be enough, check out http://16systems.com/zero.php (The great zero challenge) for more info.
scary, but cool =). @sunny256: nice tip =)