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EOS R5 Photos disappeared from CFExpress and SD card?


Help, this just happened to me 2 days ago after taking many Iceland photos including a lot of great Northern lights shots! I am shooting with an R5 with a Delkin1TB CFExpress card and a Sandisk Extreme Pro 128 GB SD card. I viewed the photos on my camera. When I tried to download the pictures from the SD card via a sandisk card reader onto my Macbook Air (M2 2022), only photos from 11/2022 and before were there. When I put the card back into my camera, all most new photos and some of my old ones were gone.  I had previously successfully downloaded more recent photos (not including the newest set) from this card but those pictures did not appear. I then tried downloading photos from the Delkin CFEXpress card using a Delkin CF card reaer and the macbook would not even recognize the card.  When I put the CFExpress car back into the R5, the photos had also disappeared.   I had previously used both cards and card readers without problems as recently as 2 months ago (i only take a lot of photos on vacation). I had updated my mac OS to Monterey and there have been 1 or 2 updates as well. 

I immediately removed both cards from my camera.  I just tried putting the CFExpress card back in the R5 after 2 days and the photos have reappeared!

Can any one offer any ideas on what is going on? I don't think both my cards could go bad at the same time.  I don't know how I am going to get the photos off the cards.



Update:  I have been playing with thisw\ and it appears that all the photos are  on the CFExpress card.  Does this mean the card is bad?



I cannot comment on the overall integrity of your cards.  The cards need to be CFExpress type B, the SD cards should be UHS-II v90's.  You can use lesser performing cards in some situations, but I wouldn't.  

My card brands of choice are AngelBird, SanDisk and ProGrade.  I think Delkin is a good brand.  Buy your cards from a reputable source, not Amazon.  CFExpressB and UHS-II v90 cards are not inexpensive.  I get it.  I don't think any of my cards are bigger than 512GB.  Its better to go with quality over quantity.

Card readers.  Pick a good one and go with one.  You don't have to buy a vendor specific reader for each brand, but with CFExpressB some vendors offer little "extras" like FW upgrades and optimization algorithms that you can't apply or use unless you have "their" reader.  I have a Prograde reader that does CFExpressB and SD UHS-II.  Its plenty fast, compact and lives in my travel bag. 

Card swaps and downloading images.  It took me a while to figure this out.  Here's what I mean.  I have my camera set to record video to card1 (CFExpressB) and Images to card2 (SD).  They operate as singles.  If I take card 2 out of my camera to download photos and shut the memory slot door, my camera is now recording everything to card1.  Even if I re-insert card2.  What's the trick...  don't close the memory slot door while the card is out of the camera.  As soon as you close the door, the camera says..  card1 is my new target for images.   So in this configuration, be mindful of this.  As long as I don't close the door, the camera picks right up where it left off.

Renaming folders and more.  Don't.  If you do this outside of what the camera allows in its menus, you are going to lose images.  The camera creates the file system.  It knows where its saving and what numbering scheme to use.  Don't change this on your computer, adding folders, renaming or changing image numbers so it starts where you want instead of where the camera knows it should be.  You'll lose images.  I keep 2-3 copies of my images when I travel.  Cumulative - running master on my card, daily copies of anything shot on my laptop and a 3rd on a USB stick or other SD cards.  Chance of loosing all 3 pretty much zero.  Even better option, carry 1-2 cards more than you might think you'd need.  Switch them out, mid day, after shooting something important, etc.  

Formatting cards.  Always do this in the camera.  Very rarely would you need to format a card on your PC or MAC.  Maybe if it were corrupt or damaged and you had recovered files from it.  Then maybe a low level format, but I'd still re-format it in camera afterwards.  Formatting in camera is always the best choice.  Happy card = happy images = happy photographer. 

If you have any cards that exhibit unexplainable data loss and you have not done one of the things mentioned above, put a small piece of blue tape or x on it.  Its now suspect until such time you have confirmed its health and integrity.  Do not trust it for once in a life time trips, family gatherings, etc. 

The key to success is being prepared, being systematic and minimizing risk.  Take from this what works best for your shooting situations.  Hope it helps. 😀  Others here will have more to add I'm sure.   

Bay Area - CA

~R5 C ( ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve ~Windows11 Pro ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8
~CarePaks Are Worth It

Update: I updated my R5 firmware, and eos utility firmware and I can now see the photos when I use the card reader. However, I cannot move the files as a group, only one individual file at a time! This is obviously a problem as I would like to quickly download the images to my external drive.

I do buy my cards from B and H to avoid counterfeit cards.