dfコマンドだと信憑性が無いな(;´Д`)

Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/sda1              1755132    269304   1396672  16% /
/dev/sda6              3028080    865512   2008748  30% /***
/dev/sda5              3028080     20300   2853960   1% /***
/dev/sdc1            493931652 463828668   5012672  99% /***/*****
/dev/sdb1             20161172     65080  19071952   0% /***/*****
/dev/sdb2             20161204   2367948  16769116  12% /***/*****
/dev/sdb3            453609604  88800432 341767144  21% /***/*****