I've a Sandisk 64gb class 10 microsd that used to work fine. All of a sudden it has become read-only. I can read all files, but I cannot delete/add any files or format the sdcard in Android, linux or windows.
Every attempt to format sdcard fails (with 10+ tools I tried) on PC (including gparted, fdsik, etc).
Micro-sd has no read-only switch. Is this hardware problem?
