🚀 go-pugleaf

thus spake bern@Uni-Trier.DE (Jochen Bern):
>Alternating magnetic Fields: This gets more dangerous. Alternating Fields
>   are able to penetrate through Materials which might filter out static
>   Fields. See below.
>
>Mailing Floppies: Since there are other Dangers to a Floppy when it gets
>   sent by Mail, it is probably wrapped into several Layers of whatever
>   Material. This is good enough to ward off static Fields, I think; Those
>   famous two Subwoofers maybe excepted. Designated Floppy Mail Enclosures
>   often include an Aluminium Plate in Order to require Arnold the Postman
>   to bend or fold them. :-) If I'm not very much mistaken, this Plate
>   might protect the Disk even if it's on the OTHER Side of the Disk
>   since Aluminium "pushs back" magnetic Fields (can somebody please
>   check this?). As mentioned by others, 3.5" are generally harder to magne-
>   tize than 5.25".


this is backwards
any conductor will provide some protection from alternating fields
it would take a suuperconductor to provide shielding from static fields
unless the container is ferromagnetic like iron
but then you run into problems with possible fields from the shielding
and ferromagnetic materials tend to be heavy
-- 
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