Hi Warthog,
have you ever run out of power to either device whilst writing images to the disc, in either camera or the memory bank?
This generally leads to a corruption of the root directory, or indexing of the memory.
It sounds like you have lost the indexing of the SD memory card and you should be formatting that.
bear in mind that erasing the images is a more thorough cleaning of the memory card than formating.
Hope it helps
Cheers G
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