magnetic interference and laptops.

[Rohan Davidson <cs322612@mailbox.uq.oz.au>]

I have a twist to the question that seems to be as old as laptops
themselves.  I've heard many opinions on whether airport x-ray machines
effect the workings of a laptop, but never seen any opinions on those 3M
thingies they seem to hold so dear in university libraries: the ones that
detect uncleared books passing through some sort of a field.  Does this
pose no risk or should one make sure the laptop doesn't pass through
these? 

Anyone with any experience?