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On 11/24/2003 08:22 AM, J. Green wrote:
I was wondering the other day how big of a magnetic field would be
needed to "erase" a magnetic storage device (floppy, removable tape,
hard drive, etc...).
As long as "etc." doesn't include MO (magneto-optical)
devices, the coercivity of present-day media is typically
1700 Oersteds or less. So that sets the order-of-magnitude
of interest. . . .