I just had a minor panic attack when my JBL wouldn't recognize a new 4gb SD card. Thanks to the info in this thread, the JBL and the SD card are now playing nicely together.
With my original 2gb card, I always removed and reinserted it with the JBL off. It always updated perfectly (I never got any message about updating, as others have mentioned). But the JBL didn't acknowledge the 4gb card at all. Only when I saw the tip about leaving the JBL on when I inserted the card did I get it to successfully read the card.
However, I then experimented and went back to my old method of turning the JBL off, removed the 4gb card, added another file, and then reinserted the card, all with the unit still off. This time, no problem at all, the files were updated.
So for my unit at least, it seems as if it only needed to be on for first time with the new card.
Just thought I'd mention it in case any other newbie is having the same issue, since it's an easier fix to try before reformatting or resetting.
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