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Another well known format tool (FAT, FAT32, NTFS) for problems with a SD card is: HP USB Disk Storage Format Tool now version 2.2.3
Sometimes is a good format(SD card) with Windows not possible, this tool works very good for a crappy SD card.
I recommend it to anyone who uses flash drives.
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Sounds like a hardware problem had the same myself and haven't yet cured it .
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I had the same problem with my 950Live and the problem was that the Sandisk MicroSD Class 10. With the MicroSD 8GB Kingston class 4 solved the problem. Hope this helps.
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Did you try to clean the contacts and taking it in/out a couple of times?