Upload & Sell: On
I had this on about 15 pictures at random intervals from a ~600 shot shoot on a Transcend 32GB 1000x card in my 1DX. After the first time, I decided to use the dual card slots and mirror the images (creating backup). Made sure to format in camera before every shoot. Was going fine for at least 4-5000 images. Then this weekend was shooting and got about 30 corrupted files out of a full card of ~930 shots. Downloaded those shots and then after that the CF card couldn't be read anymore by the camera or either of my CF readers in my computer. So I thought it must just be a bad card that got worse. Then looked at the second Transcend 32GB 1000x card that was in the other slot.....3-4 corrupted files out of another 800 or so shots. However, the corruption displayed differently in LR than the original card.
Now I'm confused if it is a card issue or a 1DX writing and corrupting the card issue. I've used Transcend cards for years and also Lexar. Never had this with any of my other cards but those were all in other bodies (5D3, 7D, 1D4). I sent the non-readable card back to Transcend under RMA request. Lifetime warranty on the cards so should get a a new one in a few weeks. I will continue to shoot mirrored so as to limit my liability of loosing pictures. I'm going to throw in my trusted Lexar 1000x that is usually in the 5D3 and has never had issues. If I start to get problems on the Lexar in the 1DX, then I think the 1DX must be the source of the problem. May have to send in the 2nd Transcend card soon also.