Sd card for ereader is full and locked

I use a sd card to download books for my e-reader. It is full and locked and it says it needs to be formated but when I try to do that it won't let me. I go in properties but there is a unlock button.
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More about card ereader full locked
  1. Try this guide, unless u have a switch on the memory card to turn off the write-protection. USB Flash Drive 101
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