mount

# df

# cat /etc/fstab

# mount -a

# umount -a

sudo fdisk -l

Find the newly added hard disk,

To create the partition on the second Hard drive,

sudo fdisk /dev/sdx

u

n

p

w

Now we need to format our newly created partition using the following command:

sudo mkfs /dev/sdb1 -t ext4

verify

sudo fdisk -l

mount the newly created sdb1 partition into other directory

or 

{

cd /mnt/
sudo mkdir 2ndHDD 
sudo chmod 0777 2ndHDD
ls -l

sudo mount /dev/sdb1 /mnt/2ndHDD -t ext4  

sudo chmod 0777 2ndHDD

touch /mnt/2ndHDD/test.txt
ls /mnt/2ndHDD/* 

} 

mount -t ext4 -v /dev/sdb1 /opt/repository/myDir
 sudo vim /etc/fstab

/dev/sdb1    /opt/repository/myDir    ext4        defaults  0    1

sudo mount -a