[TriLUG] HD Block Size (newbieish question)

[Joseph Tate]

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More secure (if you're paranoid).  Military grade disk wiping does 3-5 
passes of random data writing.  Evidently some evidence still remains 
after writing a zero what its original value was.  This evidence might 
not be legible by standard mechanisms, but if someone wants it badly 
enough could determine it.  For handing a disk off to a friend, 
/dev/zero would probably be just fine.

Joseph

rasch at raschnet.com wrote:

|On Mon, Jul 28, 2003 at 01:04:42PM -0400, B Smith wrote:
|
|>I'm about to give an older computer to a friend of mine, but before I do
|>so I would like to clean the hard drive thoroughly. I was thinking that
|>a few ` dd if=/dev/urandom of=/dev/hda ` would do the job, but am unsure
|>of what block size to use. Is there an easy way to find out the hard
|>drive's block size?
|
|
|For my own edification, why is this better than /dev/zero ?
|
|Thanks,
|David
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