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Index > Heap > have u ever hold a power off hard disk and feel its magnet?

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sleepsleep



Joined: 05 Oct 2006
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sleepsleep
hi there,
have you ever hold a hard disk on air that still spinning when you take out the power instantly?

it gave me a weird feeling, as if some sort of gravity pulling here and there.
Post 10 Sep 2011, 19:35
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MHajduk



Joined: 30 Mar 2006
Posts: 6034
Location: Poland
MHajduk
sleepsleep wrote:
it gave me a weird feeling, as if some sort of gravity pulling here and there.
Most probably the forces you have observed may be explained using the principle of conservation of angular momentum. See the article explaining how does gyroscope work.
Post 10 Sep 2011, 20:30
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edfed



Joined: 20 Feb 2006
Posts: 4237
Location: 2018
edfed
yep, the gyroscope is based on the same principle.

if a mass rotates around some axis, and the axis rotates too, the centrifuge force of the object combined with the axis rotation will induce a force on the third axis.

then, a space ship can turn in the space just by varying rotation speed of the elements of a gyroscope.

the rotation speed variation (accelerate, decelerate) will create a phase shift, and then, a sort of variation in the force.

anakin skywalker is a master in gyroscope and centrifuge force useage.
Post 10 Sep 2011, 23:38
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17250
Location: In your JS exploiting you and your system
revolution
Just think of a bicycle wheel. Gyroscopes come in all sizes, including planet Earth.
Post 11 Sep 2011, 00:11
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Enko



Joined: 03 Apr 2007
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Location: Mar del Plata
Enko
perhaps you mean this bicycle:
Image
Post 11 Sep 2011, 01:36
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Coty



Joined: 17 May 2010
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Coty
Enko, That is a unicycle.
Post 12 Sep 2011, 12:36
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malpolud



Joined: 18 Jul 2011
Posts: 344
Location: Broken hippocampus
malpolud
Basically it cant be healthy for bearings to move a spinning hard disc around other axis than its spinning axis. I avoid it as much as possible on my laptop and external hard drives.
Post 12 Sep 2011, 16:38
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sleepsleep



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sleepsleep
Quote:

Basically it cant be healthy for bearings to move a spinning hard disc around other axis than its spinning axis. I avoid it as much as possible on my laptop and external hard drives.

yeah, thanks for the tips, i don't usually move those things coz i know i shouldn't move them when they are moving Smile

but i got lots of hard disk here, around 20 units, from 10GB IDE to 1TB sata2.

so, the one i move is old HD with lots of bad sectors that i don't consider it is possible reliable anymore.

btw, any idea for these bad sector hard disk? is there anything i could output from those hard disk, taking magnet and do some machine??

is it easy to take out the magnet? i got one tools with 24 heads ...
Post 12 Sep 2011, 17:27
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malpolud



Joined: 18 Jul 2011
Posts: 344
Location: Broken hippocampus
malpolud
well when youre a driver and you have an old car, that does not have a magnet in the oil drain plug, you could attach the magnet to the oil filter to improve filtering the metallic dust Wink these aren't my photos

oil filter with magnet:
Image


oil filter inside:
Image


metallic dust:
Image

sorry im an automotive fan-boy Wink

its quite easy to get to the magnet but you probably will need torx key.

E: magnet from HDD looks different than the one on pics Wink
cheers
Post 13 Sep 2011, 08:02
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