How long can information be stored intact in a USB pen-drive? Can any experienced users answer this question?

How long is a piece of string? The honest answer is nobody knows...

But friend, I don't need an honest answer. I need a probable answer.

OK.

It's probably as long as a piece of string.

Or, if you prefer, it depends on too many factors to give any meaningful answer. How many times is that data written/deleted? The number of write cycles will impact upon longevity. The better the flash memory used, as in the more write cycles it is rated for, then the longer the data should last.

I probably wouldn't depend on USB sticks for long term storage.

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