linux-kernel - Re: Compact Flash Question

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 08 May 2008 09:26:37 -0400
From:	Mark Lord <liml@....ca>
To:	Bart Van Assche <bart.vanassche@...il.com>
Cc:	Stéphane ANCELOT <sancelot@...e.fr>,
	Helge Hafting <helge.hafting@...el.hist.no>,
	Tomasz Chmielewski <mangoo@...g.org>,
	LKML <linux-kernel@...r.kernel.org>, YSadgat1@...e.com,
	linux-os@...logic.com, Alan <alan@...rguk.ukuu.org.uk>,
	Linux IDE <linux-ide@...r.kernel.org>,
	Jeff Woods <jeff@...fwoods.us>
Subject: Re: Compact Flash Question

Bart Van Assche wrote:
> On Wed, May 7, 2008 at 5:01 PM, Stéphane ANCELOT <sancelot@...e.fr> wrote:
>> we use  silicon systems CF  with wear leveling inside  , we write a few
>> kb data back each 1/4 h  on it.(log /tmp files  are redirected to ram)
> 
> Silicon Systems CompactFlashes are the among the most reliable
> CompactFlashes I have used in embedded devices. See also
> http://www.siliconsystems.com/silicondrive/whitepapers/SSWP03-Endurance-R.pdf
> for a whitepaper that explains their wear leveling and error
> correction algorithms. Furthermore, Silicon Systems has a technology
> called SiSMART that allows to monitor by how far the CompactFlash is
> worn out, such that it can be monitored whether or not it is time to
> replace the CompactFlash. (Note: I am not affiliated in any way to
> Silicon Systems.)
..

Mmm.. according to that document, the "dynamic wear leveling" devices
might benefit from having Linux issue CF-Erase commands to unallocated sectors,
so that the onboard CF controller can then add those sectors to the wear-leveling
rotation scheme.

There was discussion at LSF'08 about possible filesystem hooks that could
be used for this (and other) purposes when deleting files.

Cheers
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/