Volume was not properly unmounted ...

# umount /dev/sdc1 # git clone http://daniel-baumann.ch/git/software/dosfstools.git # cd dosfstools # make cc -O2 -fomit-frame-pointer -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wextra -Wno-sign-compare -Wno-missing-field-initializers -Wmissing-prototypes -Wstrict-prototypes -g   -c -o fatlabel.o src/fatlabel.c . . . cc   mkfs.fat.o   -o mkfs.fat # ./fsck.fat -V /dev/sdc1 fsck.fat 3.0.24 (2013-11-23) 0x25: Dirty bit is set. Fs was not properly unmounted and some data may be corrupt. 1) Remove dirty bit 2) No action ? 1 Starting check/repair pass. Starting verification pass. Leaving filesystem unchanged. /dev/sdc1: 14 files, 2383/7161 clusters ./fsck.fat -a /dev/sdc1

dosfstools.tar.gz