I'm learning, and this is for a family member. Yes, I am tasked with helping them.
The SSD I already installed is only 128gb, I wanted to provide more storage, than just the SSD.
The old HDD came out of their old tower. I know how to format a drive, etc already.
All the files have been backed up on a external, end-user stated that they don't need more than the 128gb of storage, so there is no reason to install another HDD.
Thanks to all that had constructive criticism.
Can close this thread, do apologize if I gave you a headache.