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the first time i used, sd card was ok, but then after i installed and uninstalled a few application, the SD card was error, first i reseted to factory data reset and all was ok but then it got error again and couldnot fix with factory data reset, so i formated it and failed. the error message is "preparing sd card, checking for error" but no progress at allWhy? What does it say? Blank SDCard? SDCard Unmounted? Read Only? I don't understand your problem so provide more details.