Same issue happened 2 days ago in LG D415. Using card for >2 years. Successfully transferred card and all data from previous HTC phone 3 mo ago. Ran out of system memory on LG, so transferred all pics to same 32 GB micro-SD - and hadn’t yet backed up :-(. While transferring video of grandson’s first steps to card, got message from phone saying that SD card had been removed, and that I should have unmounted it first. The card was working fine in the phone until that message. Tried re-seating the card several times and also tried reading it on laptop SD slot and on 3 different USB adaptors - NO JOY (and it’s Christmas!!). The card is not detected, so there’s no way to use recovery software. Any recommendations about most reliable recovery vendors? And, everybody says they’re expensive - HOW MUCH?? Happy Holidays to all those without this problem!