<p dir="ltr">The journal will get hammered during the shred run so it's OK. </p>
<p dir="ltr">However, SSD drives move sectors for wear leveling and disable sectors in that process. So there are some sectors with real data that are no longer accessible by normal read/write processes that can be accessed by clever people and 3-letter organizations. Thumb drives are in this category except the really cheap ones.<br>
To ensure the data is useless on those "lost" sectors, encryption is required.</p>
<div class="gmail_quote">On Dec 11, 2014 9:34 AM, "Raj Wurttemberg" <<a href="mailto:rajaw@c64.us">rajaw@c64.us</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have external USB drives that I need to do a secure wipe on regularly. I<br>
have been using the 'shred' command but I just read that shred does not<br>
really work will on journaling file systems.<br>
<br>
The only other think I can think of is to do a manual 'dd' to the drive to<br>
write over every single sector.<br>
<br>
Thoughts?<br>
<br>
Kind regards,<br>
/Raj<br>
<br>
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