Same problem for my gf and I. She got a message about sdcard unmounting a few months ago, and didn't realise that the sdcard died and hasn't work until now. She only realised this when I told her about my own xperia z whose sdcard fried about 2 weeks ago. This is a serious problem. Some sort of legal action should be undertaken I reckon, esp. if sony's not acknowledging this issue and people using various sdcard brands and capacities are getting this problem.
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