sudo mount -t ntfs /dev/sdb4 /mnt/ntfs
ntfs_mst_post_read_fixup_warn: magic: 0x05f32218  size: 1024   usa_ofs: 40506  usa_count: 26787: Invalid argument
Record 0 has no FILE magic (0x5f32218)
Failed to load $MFT: Input/output error
Failed to mount '/dev/sdb4': 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.