I have OSX. My HD appears as two drives; one formatted for OSX, and the other FAT32 for everything. Note: I am a complete Terminal noob.
I followed the How to create a bootable USB stick on OS X page. I installed it to the Mac formatted partition, which I'm 95% sure was a mistake. I was thinking more in terms of free space than proper format.
Anyway, it doesn't boot, and I can't get the HD to appear when I plug it back into OSX. I have no idea how to undo what I did in Terminal. Any ideas?