Looking at the disks in gparted I have:

/dev/sda1
File system lvn2 pv
Label
UUID sI0LJX-JSme-W2Yt-rFiZ-bQcV-lwFN-tSetH5
Volume Group ubuntu-vg
Members /dev/sda1  /dev/sdb1
Partition /dev/sda1
Name
Flags boot/lvm

/dev/sdb1
File system lvm2 pv
Label
UUID  9HV3H6-JIYu-IdaS-2CGr-lkZQ-9xcB-RVu9Ks
Status  Active
Volume group /dev/sda1  /dev/sdb1
Logical Volumes root  swap-1

Partition Path /dev/sdb1
Name
Flags lvm

/dev/sdc1
File system  lvm2 pv
Label
UUID mqbYsB-xpm2-7c11-RLN5-q47a-A0bB-wcefad
Status Not active(not a member of any volume group)Volume Group
Members
Logical Volumes

Partition       Path /dev/sdc1
Name
Flags lvm

My current fstab is this
andrew@andrew-desktop:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/mapper/ubuntu--vg-root / ext4 errors=remount-ro 0 1 /dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
andrew@andrew-desktop:~$

So /dev/sdb1 is part of a lvm group but /dev/sdc1 is not

What command do I use to get these added to the fstab? I haven't consciously formatted either of the two new drives,is there a step I have missed?

I haven't got the dollars for a M/B upgrade so I will purchase some more DDR3 Ram to get me to the limit of the motherboard, and I will purchase a SDD as recommended. It wouldf be nice to get thses disks running so that I can dump my data on to them and then add the SDD and do a fresh install using btrfs, which, I believe will give me an effective RAID 1 config.

Many thanks
Andrew
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