Did something wrong with partitioning my SSD
I once had a simillar problem, the disk verification in disk util shown minors errors, but it wasn't able to fix them. As such, I couldn't delete a fat32 partition.
Here is what I did :


first i booted into safemode. The startup was long as it was fixing errors. (On boot, before startup chime, press and hold Shift)
after that i booted in recorvery mode (the same: on boot cmd+r)
when the recovery mode shown up, i did load the disk utility and deleted the partition.
It worked this way.


However, You Should always do backups of your data, especially if you are messing with partitions