Progress so far:

- Tested all 4 SD cards. 

One occasionally lost its connection to the camera when I wiggled it, and 
another seemed to fit loosely in the slot and its connection seemed unreliable.

I threw them away and ordered 4 new cards from B&H.

Rick



> On Sep 4, 2022, at 12:58 PM, John Francis <[email protected]> wrote:
> 
> 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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