Read Only

Today I bought an 8 gig microSD. When I tried to put some music on it, I got a READ ONLY message.
I opened up a terminal and typed 'sudo chmod 755 microsd' and got another READ ONLY message.
Then I tried 'sudo chown' and recieved the same READ ONLY message.
any ideas??
--
Dennis McClellan
Mint 15 Cinnamon desktop
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