To make the partition auto-mount.
Get your disk name
Find out the UUID of /dev/sda3 by doing:
sudo blkid sudo vim /etc/fstab
Now add add a line to the bottom of that file. It should look something like this (UUID will be different):
UUID=03ec5dd3-45c0-4f95-a363-61ff321a09ff /works ext4 defaults 0 2
Now to check whether its working run
sudo mount -a