7D mark II corrupt files on SD card

[willhl]

Has anyone had any issues with corrupt files on SD cards from the 7D Mark II? I've got an non-brand name card that works fine but two versions (got the first one replaced) of a Lexar 32GB 600x SDHC card produce corrupt files. Could it be something to do with the way the camera formats the card?
Thanks

 

[Marsu42]

Has anyone had any issues with corrupt files on SD cards from the 7D Mark II? I've got an non-brand name card that works fine but two versions (got the first one replaced) of a Lexar 32GB 600x SDHC card produce corrupt files.

Are you 100% sure your brand cards aren't forgeries? With these memory devices and the price difference no-name vs. brand, there are lots of forged ones around that have sub-spec memory cards or are even missing some of the memory altogether.

And of course even from brand items, there are always faulty batches - that's why "pro" Canon cameras (and "amateur" cameras from other manufacturers, too) have two card slots to keep you on the safe side. Offhand, I cam hardly imagine the 7d2 is to blame.

 

[Don Haines]

Low level format the card in a PC. Run any diagnostics you can from the manufacturer, then low level format the card in the camera.....

 

[Tinky]

Getting terrible deja vu here.

My 7 kept on crashing video when I used UDMA cards.

Not a known problem said Canon. Take it up with the card manufacturer.

Nothing wrong with our cards, take it up with the camera company.

Of course it wasn't a problem until Canon could trumpet their firmware fix for it. "Occassionally"

By that point I had bought a 550D which was far more stable. To be fair the firmware update did fix it, but it kind of sticks in the throat that Canon were probably working on a solution with one hand whilst telling me there wasn't an issue with the other.

The perils of early adoption.

 

[mackguyver]

Give this a try:
https://www.sdcard.org/downloads/formatter_4/index.html

 

[Viper28]

Getting terrible deja vu here.

My 7 kept on crashing video when I used UDMA cards.

Not a known problem said Canon. Take it up with the card manufacturer.

Nothing wrong with our cards, take it up with the camera company.

Of course it wasn't a problem until Canon could trumpet their firmware fix for it. "Occassionally"

By that point I had bought a 550D which was far more stable. To be fair the firmware update did fix it, but it kind of sticks in the throat that Canon were probably working on a solution with one hand whilst telling me there wasn't an issue with the other.

The perils of early adoption.

+1 I had terrible trouble with SanDisk cards in the 7D but it was fine with Lexar. Firmware did fix it however

 

[canon1dxman]

Yes I have. Took the 7D II to the Kruger in South Africa over the Christmas/ New Year holiday. New SD and CF cards. SD was a Sandisk 64GB Extreme. No problems with the CF card (Lexar UDMA 7) but the SD card showed approximately 150 corrupt files when downloading in LR5. I tried again in iPhoto, same problem. Didn't try DPP.
I just assumed that it was my first ever duff memory card so I took it back for a refund.

Definitely genuine cards, bought from John Lewis in the UK, one of the biggest retailers around. I didn't have time to get from my usual sources, WEX/ Park/ Clifton.

 

[willhl]

Thanks for the response.
I'm pretty sure the cards are genuine, reputable retailer in San Fran (Sammys) and they exchange the first one no problem. The fact it happened with both cards is what makes me thing it is something other than a faulty card (I know they show up occasionally).
As far as I can tell there is not been a firmware update for the 7D II yet, I guess waiting for the update is my best hope for now although I'll give the SD format tool a try once it's backed up. *fingers crossed*

 

[willhl]

And just for fun got a few unreadable files on the new CF card (32GB Lexar 800x UDMA 7) today too...

 

[Mt Spokane Photography]

And just for fun got a few unreadable files on the new CF card (32GB Lexar 800x UDMA 7) today too...

So are they unreadable when downloaded, or unreadable in the camera? Its common to find issues with USB readers and cables or even computers that corrupt files as they are downloaded.

If the files look OK in the camera, that can help narrow the issue down.

There have been few complaints about this with the 7D MK II, so its not a common issue. Individual cameras can be a issue.

 

[willhl]

Files do look ok in camera but I'm pretty sure what you are seeing is a jpeg preview. Either way it doesn't seem to be the card reader as I've imported directly from the camera and the image has the same issue.

In most of cases the temperatures would have been between 0C and -15C?

 

[Zekealot]

I have the same issue, my photos look like the example from the last post.

With me it only affects CF cards, SD is fine.

I have tried two brand new CF and I replaced my memory card reader. Weirdly enough if I do an in camera transfer from CF to SD the photos are fine.

 

[Marsu42]

I have the same issue, my photos look like the example from the last post.

Strange, the vertical stripes don't quite look like a classic jpeg files corruption to me, but it's really impossible to say w/o forensic analysis of the actual file data (garbage, zeros, pattern, ...)

With me it only affects CF cards, SD is fine. I have tried two brand new CF and I replaced my memory card reader. Weirdly enough if I do an in camera transfer from CF to SD the photos are fine.

Ugh, and this is getting really weird. Sounds like a case for further in-depth investigation.

Remember: When you have eliminated the impossible, whatever remains, however improbable, must be the truth. Elementary, my dear Watson

 

[anderswk]

I had similar issue with CF cards, where LR5 would refuse to read about 10% of the CR2 files after downloading via USB3. Download was also pretty slow and would sometimes hang for a minute or so.

What confused me was that DPP could read the files without complaint, so at first I assumed there was a bug in LR.

Since I've written a CR2 decoder myself, I tried parsing one of the bad CR2 and indeed it was corrupt. The raw data section was a few Kb too short, so the last few lines of the image were missing. So, LR was right.

I then tried with an old USB2 CF card reader and that worked fine. So I concluded it must be the USB3 interface that was causing it. Either the cable, the USB3 interface on my PC, or the camera's USB3 interface was bad.

Long story short, I have an ASUS mobo with Intel chipset which has USB3 ports, and in addition there's an ASMedia USB3 controller on board for extra USB3 ports. I had been using the ASMedia controller without thinking about it, so I switched to Intel and then everythings worked. No corrupt files, no hangs.

I'm a little worried that DPP just accepts corrupt CR2 files without any warning. I wonder how many users have big CR2 libraries with many partially corrupt files without even knowing about it.

 

[Marsu42]

I'm a little worried that DPP just accepts corrupt CR2 files without any warning. I wonder how many users have big CR2 libraries with many partially corrupt files without even knowing about it.

One of the advantages of dng: It has a built-in checksum so you can always verify for file corruption... gives me a certain peace of mind, what good is your backup if you don't even realize your original file is hit for six w/o looking at each and every export in detail?

 

[Zekealot]

I resolved my issue (kinda)

When transferring using 2 different CF cards and 2 different card readers that were plugged into the USB3 header of my motherboard I got corrupted issues.

I bought an old USB 2 external reader and am able to transfer without issues. I still don't know what the underlying cause is but I have a workaround so im happy.

 

[willhl]

Wow, been a while since I check in here, thanks for suggestions. I havne't made much progress but potentially gathered some more info:

-I'm now getting quite a few corrupt files on the Lexar CF card I mentioned earlier which was purchased at the same time (I stopped using the SD card long ago)
-The SD care was purchased at a reputable supplier and was also replaced once after the issue first showed up
-Corruption doesn't seem to happen on any other cards
-Happens when downloading via USB3 card reader or directly from the camera (also USB3)
-Occurs on the raw image (I typically don't shoot jpeg so don't know about them)
-I have tried using the RAW converter in camera but the resulting jpeg is still corrupt

I'm currently on an around the world trip so can't try my USB2 card reader, downloading from my mark I or provide a return address for a replacement just yet. Here's an example of one I got of a the CF card just recently.

 

[Mt Spokane Photography]

Wow, been a while since I check in here, thanks for suggestions. I havne't made much progress but potentially gathered some more info:

-I'm now getting quite a few corrupt files on the Lexar CF card I mentioned earlier which was purchased at the same time (I stopped using the SD card long ago)
-Corruption doesn't seem to happen on any other cards
-Happens when downloading via USB3 card reader or directly from the camera (also USB3)
-Occurs on the raw image (I typically don't shoot jpeg so don't know about them)
-I have tried using the RAW converter in camera but the resulting jpeg is still corrupt

I'm currently on an around the world trip so can't try my USB2 card reader or downloading from my mark I. Here's an example of one I got of a the CF card just recently.

Did you send the card back to Lexar? They are guaranteed forever. I'd do that and see what happens. It could be a incompatibility with the USB 3 controller in the camera, but since at least 100,000 7D MK II's are out there and I've only seen 2 or 3 posts at most about card issues with Lexar, I'd first have the card replaced.

If you bought it from Amazon.com, its possible that it is co-mingled inventory. They dump all of the same products in a bin, no matter who the seller is. If a seller sends in counterfeit cards, you can get them, even if the seller is Amazon and they buy from the manufacturer.

I sell on Amazon and know about the issues sellers are having with co-mingled inventory. A seller can opt out of using it, and Amazon claims they are aware of the issue and are not co-mingling commonly counterfeited items any longer. I got bit last year when I received a 3 generations old Kenko TC from Amazon. Someone probably picked them up for a low price from Surplus, and they were mixed with the current version. Kenko has been doing silent updates and not changing the part number.

 

[willhl]

I updated my previous post to try and keep it together but:
-the SD card was replaced but has the same issue
-I'll probably ask for replacement/refund if a firmware updated doesn't fix it (if one ever comes out) but I don't have a fixed mailing address for another two months.

 

[Mt Spokane Photography]

I updated my previous post to try and keep it together but:
-the SD card was replaced but has the same issue
-I'll probably ask for replacement/refund if a firmware updated doesn't fix it (if one ever comes out) but I don't have a fixed mailing address for another two months.

Its entirely possible that there is a issue with your camera. A new firmware is being released for the 7D II shortly. It may fix the issue.