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A frequent cause for damage to memory cards:
There is a technical term for it: electrostatic discharge (abbreviated ESD).
A spark results from triboelectricity, produces a short current pulse.
If this current pulse meets on a construction unit in the memory chip,
the outcome is a hole in the very thin oxide coating and a memory cell is destroyed.
This damage leaves a recess in the coating and can later lead to data loss.
Memory cards are designed in such a way to prevent damage from up to approximately 10,000 volts of ESD.
However, there are situations in which triboelectricity causes a pulse of up to 30,000 volts.
This can happen, for example, when moving over an artificial fiber carpet in low air humidity.
For this reason, never touch your memory card at the metallic contacts.
A simple way to ensure that you never touch the contacts is to never remove your card from the camera,
but instead transfer files from the camera using a USB cable.
Using this method, the risk of a total loss of data is substantially reduced.
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