Ubuntu – Mount two hard drives on start up

You should add the partitions in question to your /etc/fstab. The following line will automatically mount /dev/hda2 at boot (that's hidden in the flag default).

/dev/hda2   /   ext2    defaults    1 1

If you don't want to mount, you would issue noauto amongst your options. In your question you appear to be using uuids to address your partitions. You should probably write something like:

UUID=A2E6A54AE6A52011   /mnt/somedisk  auto   defaults 0 0

Using man fstab you can learn the specifics of the file's syntax.

Update after you posted your fstab and so on.

You really did screw up the mounting. I am surprised you can boot with four devices mounted into the same mount point /. Presumably, it mounts the first (your all important root partiation /dev/sda8) and then fails with mount point not empty when it tries the others (or some other error dependent on the type of file systems involved)

At any rate, you need to learn about fstab. Have a look at some of the first google hits for understanding fstab.

So here is what you should do:

First create the mountpoints:

sudo mkdir /mnt/sda2 /mnt/sda3 /mnt/sda5 /mnt/sda7

If you wish you can be more creative with the names. You can also put them somewhere other than /mnt. Your choice.

Next edit your /etc/fstab and put in lines for each of them

/dev/sda2 /mnt/sda2 auto defaults 0 0
/dev/sda3 /mnt/sda3 auto defaults 0 0 
/dev/sda5 /mnt/sda5 auto defaults 0 0 
/dev/sda7 /mnt/sda7 auto defaults 0 0 

I think you had a spare whitespace between the slash and the mnt/sda. These things matter since you broke the mount point into two.

Then, do not reboot. You should be able to test it saying:

sudo mount /mnt/sda2 # and so on for the other partitions

If that works, on next boot they should all come up. If you wish you can replace /dev/sda2 and so on with their respective UUID

footnote instead of screenshots, simple text would have made it possible for me to copy and paste your fstab. As it is, it's pretty but uses more bandwidth and conveys less usable information.

Once you physically install the drives in the system, and made sure that they are recognized by your computer's BIOS, boot the computer up, and see if Ubuntu can see the drives. To do that, open up the terminal, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo fdisk -l

Once you see the drives listed, go ahead and create your partitions from terminal using the fdisk command, Gparted, or Disk Utility.