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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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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 |
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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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