Partizione dati in NTFS non accessibile

Ho un pc con Windows 8 in dual boot insieme a F18. Se tento di accedere al disco dati di Windows (dove ci sono i miei documenti) mi esce questo errore

An error occurred while accessing 'Home', the system responded: The requested operation has failed: Error mounting /dev/sdb1 at /run/media/ale/Home: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sdb1" "/run/media/ale/Home"' exited with non-zero exit status 14: The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Failed to mount '/dev/sdb1': Operazione non permessa The NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting), or mount the volume read-only with the 'ro' mount option.

Come mai?

probabile chiusura su windows non corretta, ritorna su quel sistema operativo e fai un check del disco.
tieni presente che fedora 18 e windows 8 tendono a litigare sul filesystem ntfs :
http://fedoraproject.org/wiki/Common_F18_bugs#Possible_data_loss_when_dual-booting_with_Windows_8_and_using_.22fast_restart.22