Elementary OS Freya: "Failed Waiting Boot Device"

Hey,

My plan is to run some Linux distro's on an external USB HDD. So far I have been able to instal elementary OS, it thus far boots with the elementary OS logo and hangs for a while when it gives me the following message:


"Gave up waiting for boot device.
- Boot args (cat /proc/cmdline)
- Check root delay (Waiting long enough?)
- Check root (Waiting for the right device?)
- Missing modules (cat /proc/modules; 1s/dev)

ALERT! /dev/disk-uuid/*super long number* does not exist. Dropping to a shell!

BusyBox v1.21.1 (Ubuntu 1:1.21.0-1ubuntu1) build-in shell (ash)

Enter 'help' for a list of build-in commands."


To give you an idea of the external HDD partition:
60 GB: ext4 (elementary OS)
4GB: SWAP
Free Space
80 GB: NTFS (Random files)

The ext4 was given '/' for mounting point to keep it simple for now. The 'boot part' I've set to instal on sdc. Which is the external HDD. (I wasn't sure whether I should have chosen the ext4 partition or not.)

Please let me know if you need any addition information. I hope someone is familiar with the problem or knows a solution.

Thanks in advance.


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