CoreStorage logic volume failed to mount I have an encrypted hfs+ external SSD. When I plug it into my mac and, it prompts for my password, but after I enter it nothing happens.

I tried this in terminal:
I ran into this. In my case it seems the problem was the mac wanted to run a filesystem check on it. After finding the fsck process and killing it, I could then mount the drive properly.

$ ps -ef | grep fsck  
$ kill [pid from above]