I have the same problem, tried soft reset, erasing card, re-inserting card etc but Calibre wont see it. I have version 21 now - same problem and it works fine with the sony s/w + windows sees it so it's definitely a Calibre issue imho.
prs500 df
Filesystem Size Used Avail Use%
Memory 210M 31M 178M 15%
Stick 0 0 0 0%
Card 971M 48.0K 971M 0%
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