I have a 128 gb SD card that all my downloads were going on. All of a sudden the computer (both Mac and PC) stopped recognizing it. It doesn't show up when I install it.
What happened was, I was watching a movie off of the SD card, and I shut the laptop cover (putting it to sleep). When I opened it up, the computer said "SD card not ejected properly". After that, it is all screwed up.