So... this happened at a LAN party. A friend was pestering me for Linux Mint. For some reason YUMI wouldn't recognize my flash drive, so I did it the manual way.
sudo dd if=./linuxmint-17.1-cinnamon-64bit.iso of=/dev/sdb bs=1M
However, it should have been:
sudo dd if=./linuxmint-17.1-cinnamon-64bit.iso of=/dev/sdd bs=1M
It's an ADD/mental auto-pilot sort of thing.
So... the first 1.4G of my 1TB Windows 8.1 drive has been written over with a Linux Mint installer. Before, there was a 100M recovery partition and then the rest was the OS Partition. But now there's only 1 partition: the bloody installer.
I'm fairly certain it's fubar'ed beyond hope with the exception of raw sector reads. I was wondering if any of you had any thoughts or advice on more efficient methods of data recovery before I get started on that.