>On Apr 4, 2009, at 3:02 PM, Ernest L. Gunerius wrote:
>
>>
>>  I am assuming all HD cases are made of Ferrous material.
>
>They're not, they're typically made of machined aluminum; in fact the 
>technology used to make hard drive cases lead to the technology used 
>to make MacBook Air and now the MacBook cases, all start with a solid 
>block of aluminum.
>
>Typically the only ferrous parts of a hard drive are the brackets the 
>magnets are attached to.
>
>--
>Bruce Johnson
>University of Arizona
>College of Pharmacy
>Information Technology Group
>
>Institutions do not have opinions, merely customs


In that case there is no shunting and the Flux between the Poles of 
the external magnet and the flux can penetrate more readily through 
the case of the Hd.


ErnieG


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