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With flash memory there is the issue of "ware leveling" that can be addressed, in part,
by the file structure and format, the normal FAT file format does not have such features.
FAT is still used with flash as it generally works well, but it would be wise to ocasionally
(perhaps once every 3 months) run ChkDsk (for windows based systems) or the UNIX/
Linux equivalent on any active flash memory structures. That is easily accomplished
during a reformat. It is easy to temporally backup an SD card to your hard drive, do the
reformat and file system checks & automatic repairs, then restore the contents to the
SD card. It is much easier to do this using the 2.0 USB interface. For the jetBook's
internal memory you are stuck with using the 1.1 USB interface, but you are only working
with 128MB in total.
The same argument could be made for reflashing the NOR memory (but the technical
reasoning would be a little different).
While it is possible that all OP's SD cards could have been corrupted in the same fashion
so that the same problem occurs on them, I think a problem with the JB is more likely.
While it is new and under warranty I would be sure and address any existing problems,
even if operational practice makes it easier to work in a more efficient manner that is
not impacted by the "problem".
Luck;
Ken
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