I run xubuntu 12.04 alongside a NTFS storage partition and a windows 8 partition.
I moved my MySQL data directory off the xubuntu (ext4) partition, onto the NTFS partition, and did an import of a database. I left it running overnight, and in the morning, I had a filesystem crash (everything was read-only). Now when I try to boot the computer, I am taken to grub rescue.
grub rescue> ls
(hd0) (hd0,gpt8) (hd0,gpt7) (hd0,gpt6) (hd0,gpt5) (hd0,gpt4) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1) (hd1)
ls on all of these partitions, and all but two said
error: unknown filesystem. The other two said:
grub rescue> ls (hd0,gpt8)
error: invalid file name `'.
grub rescue> ls (hd0,gpt8)/
./ ../ lost+found/ OS/ Downloads/ .Trash-1000/ ... <- promising, but only shows a subset of folders
grub rescue> ls (hd1)
error: failure reading sector 0x0 from `hd1.'
Most of the other boot rescue posts on askubuntu are about failures during installation, so I'm not sure their advice to run boot-repair applies here.