I bought a 128gb microSD for my Switch on launch day. I realized the other day that it's hardly being used and I could just use internal storage for now so I took it out and put it in my PC. This is the only time Ive taken it out of the Switch since I bought the card. I start transferring some files and its impossibly slow. It took 15 minutes to transfer an MP3 and when it was done it was corrupted on the other end. So I think "Ok maybe the Switch did something weird for its format or something, I'll just reformat it." Try to format it through windows. "Windows cannot complete the format". I try several times with different formatting options, no dice. I try several formatting programs, errors all day. I try diskpart through a command line, failed. After all of this formatting nonsense I just say "I guess its stuck being only good for my Switch so I guess I'll just put it back in." Now the Switch wont read it correctly and says it's been damaged. There goes a 128gb microSD, completely rendered useless from I'm assuming the Switch. Maybe it wasn't the Switch, maybe it was some weird freak accident, who knows really Ive never had something like this happen before and Im used to dealing with some formatting bullshit from my Homebrew and modding days. Just figured I'd share this with you guys, if you put your Switch SD card into your PC and it's acting strange, just put it back into your system because its probably been wrecked. Let me know if you guys have experienced anything like this before.