On Sun, Sep 04, 2022 at 11:01:30AM -0400, Rick Womer wrote:
> Last spring we took a walk in Morris Arboretum, where the spring blossoms 
> offered lots of photographic fodder. Alas, when I got home, the card had 
> thumbnail JPGs on it, but no DNG files. As usual I erased the card (SanDisk 
> Extreme Pro) in the camera after transferring the files to my computer.
> 
> Last week we toured Winterthur, a beautiful DuPont estate about an hour away. 
> Again I took about a hundred photos. When i put the SD card into the reader, 
> I got a screen full of thumbnails from Winterthur and the flea market in the 
> parik a couple of weeks ago, all stirred together (even though the card had 
> been erased).  No DNGs.
> 
> I have four SD cards, of which three were indistinguishable until I numbered 
> them yesterday. I checked each of them with the Mac Disk Utility, and they 
> all passed.
> 
> Any ideas apart from buying a new set of cards?  Is there any way to 
> distinguish a card failure from a camera failure?
> 
> Rick

The most obvious reason for a perfectly readable card to contain only JPGs, no 
DNGs, is that the camera has somehow got set to only write JPGs.  I assume you 
checked that, but ...
(Or, depending on which camera body you have, to write JPGs to one card, and 
DNGs to a different card)
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