[ltp] IBM Harddrive protection

[Eben King]

On Wed, 5 Jan 2005, VaibhaV Sharma wrote:

> Pbt wrote:
> 
> >Le mer 05/01/2005 à 17:42, Emmanuel Doguet a écrit :
> >  
> >
> >>PH> From what I've read on this list, there's no support for the HD protection
> >>PH> under Linux. Furthermore, IBM has not released any information so the linux
> >>PH> community could build a driver itself...
> >>
> >>So the protection not work ? It's not an hardware system who work with
> >>no  drivers  ? 
> >>
> >No : you can easily check it listening the hard drive noise when
> >shocking it.
> 
> Apart from being shock sensitive, the hdd protection software on my t41p 
> shows a 3d model of the machine. You move the machine back and forth and 
> it moves the model in 3d. So there is some kind of motion sensing 
> mechanism and not just shock sensors.

I read a description on IBM's web site.  There's a 3D accelerometer (or 
three 1D accelerometers at right angles), and the driver integratrd 
the output(s) of those to compute the position of the laptop.

Since the accelerometers are physical devices, they're not infinitely 
sensitive.  Thus, if you move the laptop at below their minimum sensitivity 
or above their maximum, it won't know where it is.  This may be hard to do.

-- 
-eben    ebQenW1@EtaRmpTabYayU.rIr.OcoPm    home.tampabay.rr.com/hactar

And we never failed to fail / It was the easiest thing to do -- CSN