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In a Terminal, as root, type the following command:

hda-diskmount

Example:

[root@hda ~]$ hda-diskmount
****************************************************************
Ignoring /dev/sda1 - already in /etc/fstab or mounted
****************************************************************
Mounted /dev/sdb1 as '/var/hda/files/drives/sdb1' (read-write)
You may want your system to mount it every time you boot.
To do so, add this line VERY CAREFULLY to /etc/fstab and reboot:
UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files/drives/sdb1 ext4 defaults 1 2
****************************************************************
All Linux, Windows and Mac partitions on non-removable disks have been mounted

Do not edit /etc/fstab just yet. What you'll need to add there will depend on how you want to use the extra storage. More about that below.
Just note down the information in bold (green, red and blue). We'll use them below.

Note about ext4 in the blue line above: that doesn't necessarily mean your partition is formatted as ext4. It means the ext4 driver will be used to mount your partition. Since that driver is backward compatible, it can be safely used to mount ext2, ext3 and ext4 partitions.

If you get something like Disk /dev/dm-0 doesn't contain a valid partition table or mount: unknown file system type 'lvm2pv' its because you have LVM's that 'fdisk' can not recognize (or something similar). It's nothing to worry about if you get that when executing the hda-diskmount script.
Test your hard drive

Optionally, you can test your new drive for bad blocks.
Note that this step can take a long time to complete! You'll probably want to start it in the evening, to have it completed in the morning.

To do so, in a Terminal, as root, type the following command. Replace sdb1 with the (green) value you received from hda-diskmount.

e2fsck -cn /dev/sdb1

You'll receive a warning that says "WARNING!!! Running e2fsck on a mounted filesystem may cause SEVERE filesystem damage. Do you really want to continue (y/n)?"
Answer yes. The -cn option we're using can safely be used on mounted filesystems.
Use the hard drive

You have a choice here on how to use your new hard drive storage space. We'll offer some examples.
Use the hard drive for all shares

If you want all your shares to be on your new hard drive, here's how to do that.

First, you'll want to move all you previous shares data, if any, into your new drive.
You only need to do this next command if you have data that you care about in the /var/hda/files/* folders.
In a Terminal, as root, type the following command. Replace the path in red with the path you received when you ran hda-diskmount.

mv /var/hda/files/* /var/hda/files/drives/sdb1/

You'll get a warning about "cannot move `/var/hda/files/drives' to a subdirectory of itself"; that is fine, ignore that.

Next, you'll need to unmount your new hard drive, and remount it as /var/hda/files

umount /var/hda/files/drives/sdb1/

nano /etc/fstab

In nano, you'll need to add a new line at the bottom. Take the line that hda-diskmount gave you (the blue one), and change the second value (the path).
Replace the second value with /var/hda/files.

hda-diskmount gave me:

UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files/drives/sdb1 ext4 defaults 1 2

So I should add this instead:

UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files ext4 defaults 1 2

Make sure you do not change anything else from the blue line you received from hda-diskmount.
It might not be the same thing as the above example; you need to use the values you've received.

Save and exit nano (CTRL-X, Y, ENTER), and try your new mount:

mount -a
ls /var/hda/files/

That last command should show you the content of you new hard drive.

That's it. All your shares in /var/hda/files are now on your new hard drive.
Use the hard drive for only some shares

If you want only some of your shares to be on your new hard drive, here's how to do that.

First, you'll want to move your previous shares data, if any, into your new drive.
You only need to do this next command if you have data that you care about in the /var/hda/files/* folders (that you want on the new drive).
In a Terminal, as root, type the following command. Replace the path in red with the path you received when you ran hda-diskmount. Replace something with the name of the share you want to have on your new drive (the share should already exist).

mv /var/hda/files/something /var/hda/files/drives/sdb1/

Repeat with every share you want on your new drive.

Next, you'll need to make the mount permanent

umount /var/hda/files/drives/sdb1

nano /etc/fstab

In nano, you'll need to add a new line at the bottom. Take the line that hda-diskmount gave you, and insert that.

So, following previous examples, I should add this:

UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files/drives/sdb1 ext4 defaults 1 2

Save and exit nano (CTRL-X, Y, ENTER), and try your new mount:

mount -a
ls /var/hda/files/drives/sdb1

That last command should show you the content of you new hard drive.

That's it. Your share(s) are now on your new hard drive.
Use the hard drive in your Greyhole storage pool

If you want to add your new hard drive to your Greyhole storage pool, here's how to do that.

First, you'll need to make the mount permanent. In a Terminal, as root, type the following command:

umount /var/hda/files/drives/sdb1
nano /etc/fstab

In nano, you'll need to add a new line at the bottom. Take the line that hda-diskmount gave you, and insert that.

So, following previous examples, I should add this:

UUID=9d972abc-1639-44df-a60e-668618d40236 /var/hda/files/drives/sdb1 ext4 defaults 1 2

Save and exit nano (CTRL-X, Y, ENTER), and try your new mount:

mount -a

Finally, you'll need to configure Greyhole to select your new partition. To configure Greyhole, Advanced Settings must be enabled under Setup > Settings.

In the Shares > Storage Pool page of your Amahi dashboard, you'll see a list of mounted partitions, with checkboxes next to each, allowing you to include those partitions in your storage pool.

You should now have a new row in there, referring to /var/hda/files/drives/sdb1.

Select it (click the checkbox).

That's it. Your new hard drive just increased your Greyhole storage pool capacity.
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