The error message is:

Error mounting /dev/sdb1 at media/dennis/TOSHIBA EXT :Command-line 'mount-t "ntfs"_o
"/dev/sdb1""media/dennis/TOSHIBA EXT"' exited with non-zero exit status13:$MFTMirr does not match $MFT(recordo).

Failed to mount '/dev/sdb1':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/Fake RAID 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.

  • this tutorial about ntfsfix may help you in case you dont have windows machine available, but it's always best to fix it with a win machine, so use at your own risk, i've used it. – bistoco Jul 8 '16 at 0:40

The third paragraph says NTFS is inconsistent, and tells you how to fix it with Windows. NTFS is a Microsoft secret that Linux can't fix.

Also see this answer.

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