mounting problem

ntfsresize v2013.1.13AR.1 (libntfs-3g)
Error opening '/dev/sdc1': Permission denied
ERROR(13): Opening '/dev/sdc1' as NTFS failed: Permission denied
rust@bit:~$ sudo ntfsresize -fi /dev/sdc1
ntfsresize v2013.1.13AR.1 (libntfs-3g)
Device name        : /dev/sdc1
NTFS volume version: 3.1
Cluster size       : 4096 bytes
Current volume size: 500105761280 bytes (500106 MB)
Current device size: 500105764864 bytes (500106 MB)
Checking filesystem consistency ...
ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Failed to read of MFT, mft=15648 count=1 br=-1: Input/output error
ntfs_attr_pread_i: ntfs_pread failed: Input/output error
Failed to read of MFT, mft=15649 count=1 br=-1: Input/output error