burkphoto Loc: High Point, NC

Same here. And I’ve had the same problem with CF cards, though that was 15 years ago.

The OP should return the card to Sandisk for replacement.

These are usually great cards. We have two new ones and several older ones that work fine.

Picture Taker Loc: Michigan Thumb

i'd call Canon and see what they say.

PhotogHobbyist Loc: Bradford, PA

I had a similar problem while shooting with my Pentax Kx tethered to my HP laptop using PKTether. When shooting tethered, nothing went to the SD card, everything went directly to the computer. I never found a solution and it did not happen every time.

Hopefully you can resolve your problem and have clear uncorrupted photos.

Lorendn Loc: Jackson, WY

I also have had this problem occur with my 7D and the CF card. The problem was intermittent and would occur with only about 10% of the shots when it happened. I regularly change my cards and always reformat the card in camera before every shoot.

First - DO NOT RE-FORMAT YOUR CARD!

What I found after about 5-6 of these intermittent occurrences was that if I deleted the the corrupted images from Lightroom, removed the card from the reader, and reimported all non-duplicates from the card, most of the images were fine. Sometimes I would need to repeat the process 2-3 times but I never lost an image.

I did a major clean of my card reader and have not had a problem again. My conclusion was that the issue was not a bad card or camera error but was due to dirty pins on the card reader.

Have others had this issue?

rcarol

How would you clean the SD card contacts in the camera?

manofhg Loc: Knoxville, TN

I just tried what you said. I deleted the bad files from LR and then took the card and inserted and removed it several times from the reader in hopes of a little minor cleaning the will occur. I reimported the files which are now fine.

It's great to know that the problem wasn't the camera and none of the comments pointed to the camera as being the problem. Also I'm glad not to have to ditch the card, but wouldn't hesitate to if it had been the problem.

Anyone know a good way to clean the reader's contacts? Thanks, everyone for your thoughts and suggestions. UHH is certainly a great resource.

frankraney Loc: Clovis, Ca.

PHRubin Loc: Nashville TN USA

I second that!

TonyBot

I'd go with the SD card being bad. Same problem occurred with me when I needed a card in a pinch and purchased two from one of the BigBox stores - and only used one of them. Only a few shots were corrupted (luckily I usually take many "similars", so I lost nothing).

Soon afterwards, used the other one purchased at the same location. Same issue. My guess is I had gotten a couple of pirated cards.

Since then I've only purchased from a trusted source, always keeping a couple of extras on hand. Never had the same problem again.

manofhg Loc: Knoxville, TN

I found that the reader was the problem. I deleted the pictures off of LR then inserted and removed the SD card several times and reinserting it in the reader, then reloaded them on LR and the pictures were fine. The SD card is SanDisk brand.

TonyBot

It's good you found the problem. Looks like time for a new reader!
(Folks all have their favorite brand of card. I'm with you: SanDisk)

marty wild Loc: England

Extreme pro have 25 years warranty you just pay for postage you shouldn’t trust a media card once you have had a problem with it. Send it in it takes about 10 days for the exchange

PHRubin Loc: Nashville TN USA

Glad to hear the problem is solved for now.

amfoto1 Loc: San Jose, Calif. USA

Those are truncated JPEG files.

The ONLY time I've ever had that problem, it wasn't the camera or the memory cards.

It was the connection between the card reader and the computer. Data was being corrupted during the download process.

In my case, I had changed the connection.... added a USB hub because I needed to attach something else to the computer. As soon as I swapped a few other things around so that the card reader was again directly attached to one of the USB ports on the computer itself, i.e. not through a hub... problem solved.

Put the memory card back in the camera and review the images on its rear screen. If you see the same problems on the back screen of the camera, try a different memory card to see if that solves the problem. On the other hand, if the images look okay on the camera's screen, if you don't see the same file corruption, there's probably not any problem with the camera or the card. So it's time to look at other things.

Next, if you made any changes in your download process recently, revert to the process you were using before, when images weren't being corrupted. This can be anything from using a different connection or different reader to using a different software or even installing a recent update. Do another download from the card and see if the problem persists. If not, you know where the problem was. However, if you still see corrupted files, it's time to try some other things.

Next, if you're using a card reader, instead try downloading via the USB cable attached to the camera itself (i.e., the camera itself acting as a card reader, of sorts.... this cable needs to be one that was provided with a camera, not a plain USB cable).

If you haven't been using a card reader, if you've already been attaching attach the camera to the computer via the USB cable, instead try using a different cable (of the right type) or - better yet - get a card reader and use it. (There are risks to always using the USB cable and camera to download. It's safer to remove the card from the camera and download with a card reader.)

If you download wirelessly (via WiFi), try using a USB cable or a card reader instead.

If you find the files are corrupted in the same way no matter what download method you use, and you're confident that your computer's hard drive (or SSD) is in good condition and not too full, that suggests a problem with the memory card. Confirm by taking some shots on a different card and then using the different download methods. If no more corrupted files show up working with a 2nd memory card, that strongly suggests the problem is with the 1st card.

How new is the memory card? Out of maybe 100 or so over the past 20+ years, I've had exactly two memory card failures... and both those were when the cards were brand new. One card wouldn't work at all. The other worked the first time out, then "locked up" and was no longer accessible by any means. If it's a card you've used for a while and never had problems before, it happens, but would be rather surprising for it to just fail. If it's an older card, the problem could be something as simple as you never formatted it in-camera, or that you formatted it in your computer and didn't re-format it in your camera before saving images to it. Or it could be that someone borrowed it and formatted it in another brand of camera. Or did you use it in another brand of camera? Or it could genuinely be going bad. There is software that can test a memory card and "correct" problems on it (pretty much all cards have a few "bad" sectors that software maps around).

manofhg Loc: Knoxville, TN

Yes, I did find that it was the card reader. Someone else suggested that I delete the bad pictures from LR and try to reload them. I did and the reloaded pictures were fine. Now I need to know how to clean the contacts in the reader if I can. Thanks for responding.