Today while working on a 12.04 Server (on a VMWare machine), I suddenly couldn't write on the disk anymore.
I got this error:
Read-only file system
sudo fsck -Af
It seems like the drive changed to NTSF and I can't see any file now.
When I boot it, it shows:
error: unknown file system grub rescue >
ls, it shows:
(hd0) (hd0.msdos5) (hd0.msdos1) (fd0)
It seems like the system switched to NTSF but I have no idea why and how to fix it.
Then I ran a Live CD, I cannot mount the disk at all.