SD card won't format - Cannot format Change card

[NIc]

I purchased a new 64GB ADATA sd card and adapter for my EOS60D but it won't format in my camera.  It keeps saying "Cannot format. Change card".  Do I need a "particular" SD card or am I doing something wrong?  No, it's not on lock. (I have a SanDisk 32GB and it's happy to format that one).  Thanks

[Waddizzle]

Actually, one of the main causes of adapter failure with micro-SD cards is heat.

[BrotherBabyface]

Bob, I'm having the same issue, using a new 64GB Sandisk Extreme PRO SD card (not a micro/adapter combo). I got the card brand new with a new 70D, and it's worked just fine together up until today. This morning it happened twice at the end of two shoots. And now, it won't even let me shoot at all. Any ideas?