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Now tuning the file system size on partition /dev/sdb2 to fit the partition size...

ntfsresize -f /dev/sdb2

ntfsresize v2013.1.13AR.1 (libntfs-3g)

NTFS signature is missing.

ERROR(22): Opening '/dev/sdb2' as NTFS failed: Invalid argument

The device '/dev/sdb2' doesn't have a valid NTFS.

Maybe you selected the wrong partition? Or the whole disk instead of a

partition (e.g. /dev/hda, not /dev/hda1)? This error might also occur

if the disk was incorrectly repartitioned (see the ntfsresize FAQ).

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