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I actually have one of those (ring finger of my left hand), and I have had zero problems with magstripe cards and hard drives. Also, USB keys aren't really sensitive to magnets.

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What happens if you need an MRI?

It quickly comes out and sticks to the MRI machine.

It might come out, but then go back in and out a few times before sticking. Survival would be path-dependent.

Worst case, you tell a doctor beforehand, and they remove it with a swipe or two of a scalpel. These things are usually put in by a professional body piercer with a scalpel and no anesthetic; it's not like they're deep in the flesh or anchored to anything.

Some FLASH technologies- the ones that use tunneling diodes - are sensitive to magnetic fields when operating.

Obviously to larger ones if they are used in USB key format, since the key can go through all kind of magnetic fields while in your desktop, pockets or handbag.

I think this mainly affects writing.

True story - I was working on an embedded project. I measured the temperature of the device using a pocket IR thermometer. I noted that it was a bit warm, so a small electric desk fan ( the kind with the square flat pancake induction motor ) was pointed at it - fairly closely.

I ran a FLASH write test and it stopped working altogether. We unplugged that fan to set up an oscilloscope and presto! it worked again.

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