I have had a Sandisk 32GB microSDHC card for just over a year now. It's been in my Samsung Galaxy Note 2 phone the whole time, and not without a few problems here and there, but still usable. But now the problem is that it is now complete unusable. The current problem is that it cannot be recognized being inserted in any device I own. But the problem didn't start like that. Just today, it was working just fine without any incident. Then suddenly, the card is read as being empty, with absolutely no content inside. Plus, it cannot be changed in any way. I could not create new folders nor save any new files or photos in there, and any attempt would say that the operation failed. I tried to insert the card into all of my other smartphones and computers, using every card reader and adapter I have and the built-in microSD slot in my Surface Pro 2, hoping that the files can be read in other ways, but to no avail. And now, somehow the card is completely undetectable. None of my devices recognize that the card is even inserted, so I can't even select it on the screen to try formatting it. I tried looking for a solution on the internet, but everywhere I go, the solution is only for recovering deleted files, but never a way to make the card detectable, readable and usable again. Can somebody please help?