Just wanted to report that I have the same issue with a 8GB MicroSDHC by SanDisk. The card did work fine for some 3 months in my miobile phone (Samsung S4 Mini) but then started to behave like descriobed by all oters in this thread. Also on my PC (W7) I am prompted to format. I have not done this since I have valuable pictures on it. Is there a way to recover pictures from a corrupt SD card?
Anybody tried this, http://sdcard-pics.digitalphoto-recovery.com/ does it work for SD cards and is it reliable?
Strange that SanDisk is not taking care of this, obviously it happens not only with Samsung.
Maybe wise to use another memory card brand since this problem seems to be so common.
