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It might be broken. TO check, insert it into another phone that requires micro sd card. OR insert it into a micro sd adapter, then put it in a SD card reader, then connect it to your computer and see if it can be read. If your computer can read it, format it then try it on your phone again (All files will be deleted when you format it). If all devices can't read it, then that is the end of it.
Well, it's as simple as you see. If it's not formatting can you try another card? Not all cards from all manufacturers are the same unfortunately. You may have one that's just not compatible with your Z3. Has it worked before? Can you format it with someone else's phone? If you have a card reader you can possibly try with your computer but that may have unpredictable when you put it back in the phone, but ... you may be able to reformat it then where you couldn't before.
If there are sd card error, you cannot format your sd card. you may get messages like
"No SD memory card inserted" messages appears when using digital cameras, "A media card hard been inserted that contains errors. Do you wish to repair the Media Card now?" You can read the files on SD memory card, but you cannot write new files or you cannot edit files on SD memory card, "Access denied", when SD card is corrupted or broken,