おっけー
$ sudo fsck /dev/sdc1
fsck from util-linux 2.31.1
e2fsck 1.44.1 (24-Mar-2018)
wdrx1 has gone 180 days without being checked, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
wdrx1: 4503829/61054976 files (2.4% non-contiguous), 193856733/244190000 blocks