Trying to add used Hard Drive

Hey I'm trying to add more storage to my build. I managed to scrap a desktop my friend was throwing out and found a 2 TB Seagate Hard Drive. It hasn't been wiped and it still has the operating system and all the drivers on it. I'm going to wipe it as soon as its working, but how do install this into my pc without messing up the operating system/drivers I already have installed?

submitted by /u/Resupine_Castle
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