Errore NTFS su Debian

Montando un disco USB esterno che usiamo di scambio a lavoro (e quindi formattato NTFS per Windows) e' comparso il seguente errore 

 

luca@HW27747:~$ sudo mount -t ntfs-3g /dev/sda1 /media/cdrom
$MFTMirr does not match $MFT (record 3).
Failed to mount '/dev/sda1': 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. 

la soluzione e' banale 

sudo ntfsfix /dev/sda1