I was attemopting to read my older compact flash card from my canon E When going bach to camera now the camera giives me a card errorOS 30D to a windows 10 laptop. The cards could be read on thecamera but when plased in a sansdisk multicaard reader the computer says files are corrupt., When I go back to the camera it now says I have a card error. Four cards same result on all
4GB extreme III
8GB extreme III
I dont think all 4 failed at the same time.