On 04/18/16 04:47, Chandran Manikandan wrote: > Hi Geleem, > Please have a look below of my result. > > For my system shows like below. > df -h > > Filesystem Size Used Avail Use% Mounted on > /dev/sda2 909G 576G 287G 67% / > tmpfs 3.9G 0 3.9G 0% /dev/shm > /dev/sda1 3.9G 160M 3.5G 5% /boot > /dev/sdb1 916G 382G 488G 44% /bkhdd > > First hard disk /dev/sda > Second hard disk /dev/sdb > ===> ok. look at size from a diff perspective. in a virtual terminal, enter df -H, then df -h, followed by df -k. are you sizes closer with "-k" ? if in wonder, open second v-term, enter man df to get an understanding of how block size and rounding cause interesting results. same applies to du. neither have a -b to see actual bytes, which i believe is because disk usage is by blocks, not bytes. -- peace out. If Bill Gates got a dime for every time Windows crashes... ...oh, wait. He does. THAT explains it! -+- in a world with out fences, who needs gates. CentOS GNU/Linux 6.7 tc,hago. g .