8GB microsdhc card suddenly write protected

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Hi, I had the same problem with 32gb microsdhc and just spent hours. I solved it this way.  Saved everything on the micro to folder on primary HDD.  Downloaded latest GParted Live Cd (open source partition Manager)  here http://gparted.sourceforge.net/livecd.php (can be installed on USB). Booted computer from USB into GParted.   Gparted allowed me to delete partion(s) from SDHC and then create new one(Fat32).  Boot back to primary OS and copy files  to SDHC.  Hope it works for you/all.  Cheers GG