Mailinglist Archive: opensuse (1786 mails)

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[opensuse] Re: SSD in openSUSE.
  • From: Joachim Schrod <jschrod@xxxxxxx>
  • Date: Thu, 24 Nov 2011 01:19:08 +0100
  • Message-id: <jak2hs$fik$1@dough.gmane.org>
Greg Freemyer wrote:
On Tue, Nov 22, 2011 at 7:44 PM, Joachim Schrod <jschrod@xxxxxxx> wrote:
If you can afford it, don't use 15% of the disk. To get this free
space, use secure erase to reset the disk's firmware notion of what
you're using, and then don't allocate 15% of the disk during
partitioning.

Undocumented feature time. First secure erase is not always
implemented on SSDs, so don't trust it.

That's new for me, I haven't found this information via Google.

Can you give more information, maybe perhaps some links, about that
issue? I've always thought I can rely on secure erase via hdparm,
while respecting the frozen issue/state.

For the record:
-- My SSD is a Micron Crucial RealSSD C300, i.e., a
Indilinx-based drive,
-- I bought it with a Thinkpad T420s. It was secured against
erasing. I.e., "hdparm -I /dev/sda" explained it's frozen.
-- So, I booted the Thinkpad from a SUSE DVD, and removed the
hard disk while running and inserted it again. (This removes
frozennes, AFAIK.)
-- To check:
hdparm --user-master u --security-set-pass xyzzy /dev/sda
and then "hdparm -I /dev/sda" showed that the master pwd
is "enabled".
-- Then "hdparm --user-master u --security-erase xyzzy /dev/sda"
Afterwards check, master password is not enabled any more.

As far as I've read reports on the Net; this kind of actions
(checking that secure erase is enabled and then really doing it) is
supported by Linus.

Do you have differing information?

Joachim

PS: For Roger: Encrypted filesystems with Linux and trim levelling
are still a problem. I've read on LWN.net that it shall be better
with 3.1; but confirmation of that is still pending.

--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Joachim Schrod Email: jschrod@xxxxxxx
Roedermark, Germany

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