Re: Platinum 5.25" drive problem

[mjmahon@aol.com (Michael J. Mahon)]

Stephen Shaw wrote:

>I was once working in a hospital near an MRI machine (magnetic resonance
>imaging) a cleaner had left a metal trashcan at the doorway of the room. When
>the MRI machine was switched on that can flew about 45 feet and attached
>itself
>to the machines surround.

This phenomenon has been in the news lately, as a result of a
fatal accident.

> If you used a magnet that powerful yes I'd say you
>would magnetize disk drive heads but as I have said before I have been
>resurrecting 3.5" HD disks for over 3 years without any problems with my 3.5"
>drives. I have been repairing electronic items for over 30 years without ever
>hearing of this sort of problem before. I know I don't know everything
>electronic but I doubt that the heads would be magnetized.

In fact, the degree of magnetization of _anything_ is limited by its
magnetic properties, and not by the strength of the magnetic field
magnetizing it.  Once the material is saturated in some alignment,
then additional field strength does nothing.


-michael

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