If your requirement is for long term data storage/archiving, then the Fujitsu DynaMO 2300U2 may be the way to go as it has a 30 year media storage lifetime.
Where do you find a shielded USB memory stick? I assume you're not talking about the "rubber shielded" ones, but some form of electrical/static shielding. I can't seem to find such a beast.
Careful here. "memory stick" is not USB. My MIL walked into a computer store asking for a memory stick and got a Sony memory stick, I told her to ask for a USB flash drive next time. The term memory stick is getting mis applied to flash drives.
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