So i have a nikon D600, it works great, in it i have a 64gb SD card and it works totaly fine. One time I transfered some new photos from the SD card to my laptop, and everything was fine, but then i transfered them from my laptop to my external hard drive, and quite a few photos were coruppt. You could open them but one side of the picture was purple, black, white, blue or something similar. I shot everything im JPEG Could this indicate that my external hard drive is failing? i am not sure what is causing this because it just seems weird that file transfer would cause this kind of corruption. What do you think?