ntfs_mst_post_read_fixup_warn: magic: 0xffffffff  size: 1024   usa_ofs: 65535  usa_count: 65534: Invalid argument
Record 0 has no FILE magic (0xffffffff)
Failed to load $MFT: Input/output error
Failed to mount '/dev/sda4': 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.