Warp wrote:
>   And how would it detect at that stage if something modified the MBR?

It stores in the CMOS the checksum of the previous MBR.

> And even if it did, wouldn't it be too late? The modification and thus
> the damage already happened.

MBRs are pretty standard. You know your system is hosed, so instead of 
continuing you boot the CD and rewrite the MBR. :-)

-- 
   Darren New / San Diego, CA, USA (PST)
     "That's pretty. Where's that?"
          "It's the Age of Channelwood."
     "We should go there on vacation some time."

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