Assuming device /dev/xvdd being mounted to /data.
sudo mkfs -t ext4 /dev/xvdd
sudo mkdir /data
sudo mount /dev/xvdd /data
Add line to /etc/fstab to mount every boot:
sudo vi /etc/fstab
/dev/xvdd /data ext4 defaults,nofail 0 2
If you don't know the device name you can find it with:
lsblk