Mac mini can't format SD card

I've tried several SD cards that work fine in a friend's imac but not in my 2011 mac mini. Card shows up in disk utility as read only. I've tried resetting the SMC, no change. Tried putting the lock slider to locked or between locked and unlocked, no change.
Any ideas? This is pretty annoying for a computer that just left warranty...

I'm having the same problem. Tremendously annoying because the only help I've been able to find says 'drag and drop files' (I wish I could) and 'repair disk permissions'--which is not an available option in Disk Utility.

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