/dev/sdb1  *         2048     206847    204800   100M  7 HPFS/NTFS/exFAT
/dev/sdb2          206848  614402047 614195200 292,9G7 HPFS/NTFS/exFAT
/dev/sdb3       614402048 1465145343 850743296 405,7G  7 HPFS/NTFS/exFAT

sudo ntfsfix /dev/sdb3
Mounting volume... NTFS signature is missing.
FAILED
 Attempting to correct errors... NTFS signature is missing.
FAILED
Failed to startup volume: Invalid argument
NTFS signature is missing.
Trying the alternate boot sector
Unrecoverable error