[Simon Hunt]

I have had the same issue with my 7D and a recently purchased Sandisk 16G Extreme 30mb/sec card. My older Sandisk 16G extreme IV has not given me any issues. Some experts I’ve spoken to say you must reformat your card each time it’s downloaded and re-inserted. I want to test this theory. Most other reports I’ve seen on this issue are reporting use of the Sandisk 16G 30mb/sec card.