After adding a disk to linux you should do these steps to use it:
fdisk -l
You can see the your new disk and take its name then:
fdisk /dev/sdb
then press n and after that press enter for 3 steps later and finally press w to write the changes. Now yu can run the following command:
fdisk -l
and see that your disk is ready to use. In this step we want make partition on it:
mkfs.xfs /dev/sdb1
This command make xfs the disk you can use other formats like:
mkfs.ext4
now for mounting yu should do this:
blkid /dev/sdb1
then copy the UUID from output and:
nano /etc/fstab
and write these end of the file:
UUID=xxxxxxxxxxxx /var/lib/postgresql defaults,noatime 0 0
then run:
mount -a
this command run the fstab file.