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Russell H.
Russell H., Service Tech
Category: Camera and Video
Satisfied Customers: 10785
Experience:  8+ years of professional experience
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My 7d mk II will not write to the cf card
, I have had

Customer Question

My 7d mk II will not write to the cf card
JA: Thanks. Can you give me any more details about your issue?
Customer: I have had the camera about 6 months and worked fine. The last 2 times out there was nothing on the card when I got back. Also I noticed it took an unusually long time to buffer. I have tried two different cf cards and a sd.
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Submitted: 1 year ago.
Category: Camera and Video
Expert:  Russell H. replied 1 year ago.

Hi, thank you for contacting My name is Russell. I will do my best to provide the right answer to your question.

Make sure the cards are not too large for the camera's memory card slot to write to. Coming back with nothing on the card sounds suspiciously like that, if not exactly definitely that sort of problem.

Then, consider whether the cards were Write-LOCKed. Check the LOCK switch on them, in short. To be fully usable, the card should have the LOCK switch in the direction of the base of the arrow next to the switch, not in the direction of its point (which is the LOCKed position.)

After that... your camera might well have a defective memory card slot. In which case, considering it is about 6 months old (less than a year old) you should at that point call


and put in a failed-within-warranty claim on the camera, for free-of-charge repairs to it under Canon's 1-year basic warranty provisions. (Note: it's good to have proof of the purchase date handy when you make that call. Whether a sales slip, or credit-card records, proof of purchase date may be necessary to present.)

If this answers your question fully (and I think it does) please rate my answer, so that this case may be closed. Thanks, ***** ***** luck.

Customer: replied 1 year ago.
Well first of all CF cards do not have lock switches on them. The second card I tried came out of another 7d camera.
"Make sure the cards are not to large for the slot to write to." Don't even know what to say about this. I don't think your very familiar with canon cameras.
Yes I know I can send it back to canon. Thanks I have to give you an F
Expert:  Russell H. replied 1 year ago.

Well. What I meant by 'too large' is, that in some Canon cameras (and other devices) the SD card slot can't handle the cards with total capacities above 4 GB... the SDXC and SDHC cards, that is.

If one card came out of another 7D camera and worked there, that proves the case: the memory card slot in your problem camera is defective somehow.

And, my advising you to send it to Canon for warranty repair, free-of-charge, stands all the more, so.

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