On Sun, 6 Jun 2010, Jeff The Drunk wrote:

On Sun, 06 Jun 2010 11:06:09 -0400, Ralph Mowery wrote:

"john hamilton" wrote in message
...
Have tried using the strongest cuboard magnet I can find (In north
London u.k.), but if the wind picks up surprisingly it will just not
hold. Also

The magnet out of a hard drive is flat and very strong.

Really? What kind of hard drive has a big flat magnet inside? That defies
all logic on the principals of how a hard drive works.

No it doesn't.

There is a pair of very strong magnets in every hard drive I've taken
apart. I'm not sure exactly what they are doing, but the actual arm
with the read/write head is between the magnets. Since there is a pair
of them, they incidentally contain the magnetism. They are right next
to the platter(s).

These are strong, you don't want to get your finger between them.
I suppose a big speaker magnet might be stronger, but they are also
a lot bigger.

Michael