SanDisk quality has really went down hill and trying to get Sandisk to replace their defective products is a complete waste of time. 3 cards now that I have had issues with. The others were 32gb cards. Initially work then undock and nothing will read them or even sense they are installed. Tried many things. To return to SanDisk you have to have screen shot of receipt, a photo of each side of the card....including the printing on the back of the card which is so small you can barely even see it. You then wait to see if they will accept them, then mail them in, then you wait and wait. I will not buy them anymore.