Re: [SLE] deleting/writing on a read-only filesystem

On Friday 04 August 2006 21:49, Carl Hartung wrote:
On Friday 04 August 2006 15:41, Leendert Meyer wrote:
The really paranoid people would do this:

shred -x /dev/hdx

I did that once with a USB-pendrive. See "man shred" for an explanation.

Hi Leen,

I realize you suggested he read the man page for shred, but since this
disclaimer is well towards the bottom, it bears emphasizing:

CAUTION: Note that shred relies on a very important assumption: that
the file system overwrites data in place. This is the traditional
way to do things, but many modern file system designs do not satisfy this
assumption. The following are examples of file systems on which shred is
not effective:

* log-structured or journaled file systems, such as those supplied
with

AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)

Of course you're quite right. But /dev/hdx does not refer to a file system,
but to the whole (unmounted) disk. So if shred is used that way (/dev/hdx), I
can't share your worries. :)

And, after reading jdd's post, better to /physically/ shred the drive /too/.

Cheers,

Leen

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