Difference between df-h and fdisk command [closed]

Question

We know that df -h command shows disk usage in human readable format and fdisk command shows all the disks used in the linux partition.

But when i am giving df -h command the following output has been shown:

**Filesystem      Size  Used Avail Use% Mounted on
/dev/loop0       18G  2.9G   14G  18% /
udev            1.4G  4.0K  1.4G   1% /dev
tmpfs           576M  888K  575M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            1.5G  160K  1.5G   1% /run/shm
none            100M   56K  100M   1% /run/user
/dev/sda5       140G   52G   88G  38% /host
/dev/sr0        225M  225M     0 100% /media/aritradas/McAfee
/dev/sda3       150G   59G   91G  40% /media/aritradas/OS**

At the same time when i am giving fdisk -l command the following output has been shown:

   **Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63      257039      128488+  de  Dell Utility
/dev/sda2   *      258048    20979711    10360832    7  HPFS/NTFS/exFAT
/dev/sda3        20979712   333627391   156323840    7  HPFS/NTFS/exFAT
/dev/sda4       333627392   625139711   145756160    f  W95 Ext'd (LBA)
/dev/sda5       333629440   625139711   145755136    7  HPFS/NTFS/exFAT**

From the above mentioned outputs it is clear that in the first output only /dev/sda3 and /dev/sdba5 is displayed. But in the second output /dev/sda1,/dev/sda2,/dev/sda3,/dev/sda4,/dev/sda5 are displayed.

Kindly let me know the why this difference between df -h and fdisk -l commands exists.

Answer 1

df -h displays all of the mounted partitions.

fdisk -l displays all of the partitions that exist on your disk.

Apparently there are some partitions which exist, but which are not mounted.