Error mounting: mount exited with exit code 13: $MFTMirr does not match $MFT (record 0).
Failed to mount '/dev/sdd1': Input/output error
NTFS is either inconsistent, or there is a hardware fault, or it's a
SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows
then reboot into Windows twice. The usage of the /f parameter is very
important! If the device is a SoftRAID/FakeRAID then first activate
it and mount a different device under the /dev/mapper/ directory, (e.g.
/dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
for more details.

Nagu ka juhend ju ütleb, tuleb see probleem korrastada Windowsi kaudu..

My partition hdc1 had the same problem in Knoppix (would have persisted in Ubuntu of course)

Sadly, booting Windows was not an option because I am stubborn.
Fortunately, I was able to do this instead:

Code:

sudo -i
ntfsfix /dev/hdc1
ntfs-3g /dev/hdc1 /mnt/ntfs -o force

Before you do this, make sure the device is not mounted (then again could it be mounted?? lol)

The first line is like a "su" or sudoing the next two things.
The third line failed, despite which I was able to mount on subsequent attempts (although I used the GUI so I can't say what command exactly - it isn't relevant.)

I hope this helps someone in the future.
Use it at your own risk, your mileage may vary etc.
Still, if you're fearless and you can't afford to boot Windows, this MIGHT be appropriate. rtfm etc.