The “SanDisk” Mobile Ultra microSDXC 64GB was inserted and formatted via my Android 4.0.3 device since 01.Jul.2013, I can read and write without any issue. Not until last month, I found that my Android device was getting real slow so I try to delete photos and videos taken with USB cable connected to PC, I was responded that my SDXC was “readonly”. I removed the card and inserted into a card reader, similar error.
I tried ‘chkdsk j: /f’, I was reponsded:
“A media error has been detected. Bad sectors may be present on the volume.
The volume will be checked for bad sectors.
Windows is verifying files and folders…
Corruption was found while examining the volume bitmap.”