Adding a new linux disk:
Find the device (use dmesg)
Delete any partitions on the new disk:
fdisk /dev/sde
And add a new linux partition.
The use mkfs - in this case to create a ext4 filesystem
mkfs.ext4 /dev/sde1
Then tune the filesystem a little:
tune2fs -m 0 /dev/sde1
tune2fs -L backup2 /dev/sde1
-m 0 removes the reserved blocks
-L xxxx labels the filesystem