If you can find an outer case made of soft steel or other ferromagnetic metal, it might afford some protection as a magnetic shield for the phone. Field strength drops off quickly (1/R^2) with distance from a magnet.
Either the flash drive is moved into and/or out of the magnetic field, or the magnetic field is turned on or off with the flash drive near Even if your purse uses high-strength rare earth magnets I don’t think they’ll ever get close enough to the chips inside the phone to cause “flipped bits.” Even withokut an outer case, a couple millimeters of clearance from the chip surface to the outside of the phone (where a magnet might actually make contact) will likely be sufficient. Some motion, as defined by Maxwell’s equations, is practically required. (or fry circuits if the field is strong enough) Moving a flash drive through a strong magnetic field induces a current which can flip bits. Generally with solid state memory, it isn’t necessarily the strength of the magnetic field that flips the bit, but the motion of the material through the magnetic field. But yes placing any type of flash near strong fields can flip bits. It would have to be something stronger than your average fridge magnet. My first thought was that as these were all solid-state electronic, with EEPROM/Flash memory cells, there shouldn’t really be anything that would be disupted by magnetic fields. Here’s a nice, techy discussion: Should smartcards be affected by magnetic fields? Here are excerpts, from various contributors: Electronic chips (including solid-state memory) are not affected by magnetic fields.
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