Additional hard disk in laptop CD-Drive ( Ultrabay)

I recently did an upgrade to my Thinkpad T420 (Read the post ) .  During the upgrade , I replaced my HDD for a SSD. The performance had improved drastically and I am completely happy about the upgrade.

Now the issue is that the SSD is of a lower capacity ( 120 GB ) and does not have my music and videos. They are still in my HDD. So I will need to have constant access to them. Now the question is how to make use of the currently obsolete HDD.
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