SD Card Won't Mount, And Shows Up In Disk Utility As Full! Help!

[Yung ReeZi]

So I wanted to set up my SD card to run Retropie on my Raspberry Pi 2. I started by mounting it and trying to put the OS on there with Apple Pi baker. Well, I started it and apple Pi baker was stuck on some "Finding Recipe" after I started it running the install of Retropie. The only fix I could think of was to format it to Fat32 on a different computer, but when I plugged it back into my mac, it wouldn't mount. I opened disk utility and it said it was there as Fat32 but didn't have any free storage. I tried to format it again to Fat32 on the same computer but it didn't do anything. And then again on my mac to a format that Apple supports, but it fails every time. I tried to restore it only for the same results, I would love to hear if anyone has any ideas.