Date: Mon, 22 Aug 2005 19:20:51 +0200 From: Gary Jennejohn <garyj@jennejohn.org> To: freebsd-hackers@freebsd.org Subject: Re: IBM Active Protection System Approach Message-ID: <200508221720.j7MHKpNb022773@peedub.jennejohn.org> In-Reply-To: Your message of "Mon, 22 Aug 2005 17:55:42 %2B0200." <5FFDC44D-F094-4856-8FAC-4D14EB77B47A@sarenet.es>
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Borja Marcos writes: > > Søren Schmidt writes: > > I think this will need to be tailored to the exact type of "mishap" > > one wants to protect against. > > I think that the main purpose of the shock detection system is > to allow data to be recovered from the disk in case the laptop is > broken. By parking the heads asap you can avoid damaging the plates > with the head. > > At least that's what I read. The disk won't be necessary usable > after being dropped, but at least the plates should be readable. > > In that case, priority number one would be a fast parking of the > head. However, it could lead to a worst-case data loss with > softupdates and the disk cache, isn't it? > It seems to me that the worst-case scenario, dropping the laptop, would result in extremely high G-loading in microsecomds rather than milliseconds. Not much can be done to save the disk in such a short time. A scenario where the user bumps the laptop while in use might be helped, though. --- Gary Jennejohn / garyjATjennejohnDOTorg gjATfreebsdDOTorg garyjATdenxDOTde
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