After the system comes up, it should have detected the new disk.
You can view the dmesg file with the command:
kless /var/log/dmesg
This dmesg file contains the messages that are generated as your system boots up.
By reading this output you can see the system has assigned device names hda, hdb, hdc and hdd.
"hda" is the original hard drive and "hdb" is the entry for the new disk.