iqbala@ghar-iqbala:~$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/ghar--iqbala-root
                      680G  2.4G  643G   1% /
udev                  3.9G  4.0K  3.9G   1% /dev
tmpfs                 1.6G  848K  1.6G   1% /run
none                  5.0M     0  5.0M   0% /run/lock
none                  3.9G  1.3M  3.9G   1% /run/shm
/dev/sda1             228M   30M  187M  14% /boot
/dev/sdb1             3.8G  687M  3.2G  18% /media/5DF7-4E17

iqbala@ghar-iqbala:~$ cat /etc/crypttab
sdb5_crypt UUID=3272b84b-d7f2-49d3-a77c-44667fa7f4a9 none luks

iqbala@ghar-iqbala:~$ sudo cryptsetup status sdb5_crypt
[sudo] password for iqbala:
/dev/mapper/sdb5_crypt is active:
  cipher:  aes-cbc-essiv:sha256
  keysize: 256 bits
  device:  /dev/sda5
  offset:  2056 sectors
  size:    1464643576 sectors
  mode:    read/write