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Is this also mu-metal ?


Externet

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Hi all.

Magnets inside hard drives are bracketed by mu metal.  Is the outside plate seen in some hard drive covers also mu metal ?   Like the greyish portion on the cover below:

The covers without an attached 'plate', are they usually made of mu metal ?

 

image.thumb.png.d25c6353ad48deb981ba377946f75594.png

 

Cover alone :

image.thumb.png.e765b0b277d6a21a471595d65c38fce2.png

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Thanks.  Fully agreed;  those  strong magnets with mu metal are permeating their own flux properly away from the platter to avoid data loss. 

I suspect any lining on the covers as pictured is more to prevent nearby speakers, other hard drives and external strong fields from harmful effects.  That is the doubt that triggers this thread;  could that material be also mu metal ?.

How to test ?  Visually, they never rust, as the mu metal behaves, and same sheen.  When applied a magnet to some covers, they are not magnetic; other covers that have a liner are magnetic only on those areas.  Could be non-magnetic stainless.

Made a clumsy video, drive at left has a metal attached to top lid (eggy contour) and attracts a magnet.  Drive at right shows no attraction.

----> https://www.dropbox.com/home?preview=P1010716.MOV

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