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will a magnetic field damage data on a USB3 thumb drve?



 
 
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  #1  
Old March 7th 15, 06:17 AM posted to alt.comp.os.windows-8
Peter Jason
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Posts: 2,310
Default will a magnetic field damage data on a USB3 thumb drve?

I want to hide such a drive in a magnet box to cling to a metal
surface. Peter
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  #2  
Old March 7th 15, 07:17 AM posted to alt.comp.os.windows-8
Paul
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Posts: 18,275
Default will a magnetic field damage data on a USB3 thumb drve?

Peter Jason wrote:
I want to hide such a drive in a magnet box to cling to a metal
surface. Peter


The information is not recorded magnetically, so the
answer is "No effect".

This article will give you some idea how the
values are stored - on floating gates.

http://en.wikipedia.org/wiki/Floating-gate_MOSFET

Fowler-Nordheim tunneling and hot-carrier injection

An energy source strong enough to achieve the same
effect, can work. If you ripped the top off the flash
chip plastic body, and exposed it to UV light for
a couple of weeks, you might erase it. If you
exposed the flash chip to ionizing radiation,
that might be enough to erase it.

*******

You can shield objects from a magnetic field,
using annealed mu-metal, if you want to. For
serious work with magnetic fields, if you
bang or drop the shielding material, it must
be annealed again. But in this case, that
would be unnecessary,

http://en.wikipedia.org/wiki/Mu-metal

With respect to rotating hard drives, the
drive already has a strong magnet in the arm
actuator (voice-coil design). So the platter
has to reject the stray magnetism from that
thing, as attenuated by the keeper. Modern
vertical recording hard drives, are slightly
more sensitive to external magnetic fields, so you
might avoid using rare earth magnets to adhere
a 4TB hard drive to the bumper of your car. And
a piece of properly designed mu-metal to shield
something the size of a hard drive, would cost
around $500.

HTH,
Paul
  #3  
Old March 9th 15, 02:24 AM posted to alt.comp.os.windows-8
Peter Jason
external usenet poster
 
Posts: 2,310
Default will a magnetic field damage data on a USB3 thumb drve?

On Sat, 07 Mar 2015 01:17:38 -0500, Paul wrote:

Peter Jason wrote:
I want to hide such a drive in a magnet box to cling to a metal
surface. Peter


The information is not recorded magnetically, so the
answer is "No effect".

This article will give you some idea how the
values are stored - on floating gates.

http://en.wikipedia.org/wiki/Floating-gate_MOSFET

Fowler-Nordheim tunneling and hot-carrier injection

An energy source strong enough to achieve the same
effect, can work. If you ripped the top off the flash
chip plastic body, and exposed it to UV light for
a couple of weeks, you might erase it. If you
exposed the flash chip to ionizing radiation,
that might be enough to erase it.

*******

You can shield objects from a magnetic field,
using annealed mu-metal, if you want to. For
serious work with magnetic fields, if you
bang or drop the shielding material, it must
be annealed again. But in this case, that
would be unnecessary,

http://en.wikipedia.org/wiki/Mu-metal

With respect to rotating hard drives, the
drive already has a strong magnet in the arm
actuator (voice-coil design). So the platter
has to reject the stray magnetism from that
thing, as attenuated by the keeper. Modern
vertical recording hard drives, are slightly
more sensitive to external magnetic fields, so you
might avoid using rare earth magnets to adhere
a 4TB hard drive to the bumper of your car. And
a piece of properly designed mu-metal to shield
something the size of a hard drive, would cost
around $500.

HTH,
Paul



Thanks Paul.
 




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