$ df -B 1 /dev/sdc1
Filesystem 1B-blocks Used Available Use% Mounted on
/dev/sdc1 501760000 4358144 497401856 1% /media/xieerqi/HEXMEX
$ df -H /dev/sdc1
Filesystem Size Used Avail Use% Mounted on
/dev/sdc1 502M 4.4M 498M 1% /media/xieerqi/HEXMEX