[ubuntu] Multiple harddisks

Hello!

I'm trying to install some new disks into my system.
Ubuntu Server 16.04 LTS.

I get some problems doing it! And i can't figure it out why..
Disks already installed:
1 SSD - 120GB
1 HDD - 2TB
1 HDD - 3TB
2 HDD - 3TB (trying to install - Seagate Desktop HDD 3TB 7200RPM)

System:
INTEL Core i7-5820K 3,3GHz LGA2011 15MB
ASRock X99M Extreme 4, Socket-2011-3
Cooler Master V 750W

When i need a new disk i get this message:
Welcome to emergency mode!
VFS: Can't find ext4 filesystem.
When i use the command lsblk -o NAME,FSTYPE,SIZE it seems like that new disk takes one of the already installed disks name, and crashes?
So now my 3TB disk, only shows as 700-800GB when i try to format it in windows, to start from scratch.

Please tell me that there is someone out there that have been true the same, and have a quick and easy solution!
Thanks alot for your time!