IBM Active Protection System Approach
Julian Elischer
julian at elischer.org
Tue Aug 23 02:47:12 GMT 2005
Borja Marcos wrote:
>> 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.
no,
the aim is to detect the LACK of acceleration as the laptop goes into freefall.
You have about 1/4 a second to get the heads in once you detect that you are falling.
Quick by human standards but an eon in computer terms.
>
> 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?
>
>
>
>
> Borja.
>
> _______________________________________________
> freebsd-hackers at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe at freebsd.org"
More information about the freebsd-hackers
mailing list