Paul Arthur wrote:
> On 2013-01-17, Maxim Kammerer <m...@dee.su> wrote:
>
> > All in all, secure-delete has its uses. What are people supposed to
> > use instead, dd if=/dev/zero of=/media/sdcard/naked_gf_0001.jpg?
>
> Perhaps 'shred', which is part of coreutils?
>From man shred:
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, or is not guaranteed to be effective in all file sys-
tem modes:
* log-structured or journaled file systems, such as those supplied with
AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)
In addition, pretty much every flash media that exists today does flash
translation *and* has spare unaddressable flash for error correction.
The best software can do is to repeatedly overwrite the flash with
random bytes. (Don't use /dev/zero because clever translation sees
that other pages already have the same contents, and thus does not
overwrite any flash cells.)
//Peter
