How do I add an additional hard drive?

1 Partition

The easiest and user-friendly way is probably to use gparted after you have installed your new HDD and boot your machine:

sudo gparted

Then you create partitions, by setting their size and type.

If a partition table does not exist yet, you likely want to choose the type as gpt for Ubuntu-only machines and msdos (aka MBR) for dual-boot Ubuntu/Windows machines. See this forum post for additional discussion
Since your hard drive is additional storage space, you probably want to create one single big partition with the type of ext4
After adding the new partition, make sure that the left-most partition column shows a true filepath (i.e. /dev/sdb1) rather than a placeholder like "New partition #1". If you see the latter, click "Edit > Apply all operations" from the top-bar to actually execute the new partition. Otherwise, it is just in a pending state and your mount will fail in step 2.3

Screenshot of gparted

gparted is a very easy to use tool, and yet very advanced.

2 Mount

After you are done creating your partitions (most likely it will be just one ext4 data partition, since this is your additional storage drive), you need to permanently mount it.

At this step you already know what names your new partition(-s) have. If not sure, following command will remind you about existing drives and partitions on them:

sudo fdisk -l

This will output something like this (intentionally skipped /dev/sda system drive info):

Disk /dev/sda: 250.1 GB, 250059350016 bytes
....

Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000814e3

   Device Boot      Start         End      Blocks   Id  Syste
/dev/sdb1               1      243201  1953512001   83  Linux

Output states, that your new partition is /dev/sdb1. Now you need to mount it to utilize it's precious space. To achieve this, you need to perform three simple steps:

2.1 Create a mount point

sudo mkdir /hdd

2.2 Edit /etc/fstab

Open /etc/fstab file with root permissions:

sudo vim /etc/fstab

And add following to the end of the file:

/dev/sdb1    /hdd    ext4    defaults    0    0

2.3 Mount partition

Last step and you're done!

sudo mount /hdd

Links

fdisk partitioning tutorial, command line alternative.
GParted tutorial.

Modern drives are huge and need to be partitioned with GPT to allow 2TB+ in size.

Find your disk:
```
sudo blkid
```
If it is already formatted, you should see entry like /dev/sdb1 with UUID and PARTUUID settings.
If your disk is not formatted, create a new partition:
```
sudo cgdisk /dev/sdb
```
and format it:
```
sudo mkfs -t ext4 /dev/sdb1
```
Create directory for your hdd:
```
sudo mkdir /media/storage
```
Run sudo blkid again, note the UUID of your /dev/sdb1 partition and add it into /etc/fstab (make a backup of fstab by installing etckeeper - this file is important):
```
UUID="b4c93..."  /media/storage  ext4  defaults  0  2
```
fstab wiki page describes what does it mean. This should make it persistent over reboots.
Finally mount it without rebooting to test:
```
sudo mount -av
```

First you need to identified the new hard disk.

press CTRL+ALT+T to open a console then type :

lsblk

You will see something similar with this:

loop0    7:0    0 86.6M  1 loop /snap/core/4486
sda      8:0    0    5G  0 disk 
├─sda1   8:1    0  512M  0 part /boot/efi
└─sda2   8:2    0  4.5G  0 part /
sdb      8:16   0   10G  0 disk
sr0     11:0    1 1024M  0 rom

For example the sdb it's the new hard disk that you want to add.

If the sdb it's a new hard disk , you need to format to ext3 or ext4

sudo mkfs.ext4 -j -L NewHDD /dev/sdb

Keep in mind, command above will delete everything on target hard disk. You can skip this step if there are any data on the hard disk and you want to not lose them.

Now you need the UUID of the new hard disk.

sudo blkid /dev/sdb

You will see something similar with this:

/dev/sdb: LABEL="NewHDD" UUID="5d6c8f68-dcc8-4a91-a510-9bca2aa71521" TYPE="ext4"

next step it's to add the new hard disk in fstab for auto mount after reset:

sudo nano /etc/fstab

And add new line on bottom, with follow content:

/dev/disk/by-uuid/5d6c8f68-dcc8-4a91-a510-9bca2aa71521 /mnt/NewHDD auto nosuid,nodev,nofail,x-gvfs-show,x-gvfs-name=NewHDD 0 0

Remeber to replace the 5d6c8f68-dcc8-4a91-a510-9bca2aa71521 and /mnt/NewHDD whit your own UUID and path where will be mounted, CTRL+X then press Y and ENTER to save it.

To mount it use: sudo mount -a , if the result will be:

mount: /mnt/NewHDD: mount point does not exist.

You must create mount point sudo mkdir /mnt/NewHDD then use again: sudo mount -a

Also you need to change owner and group of the new hard disk using next command:

sudo chown user:user -R /mnt/NewHDD

Replace the: user:user with your own user and group that you need it.