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#11
strollin beat me to it but I thought it important to reiterate as proper (or current, in this case) terminology is, IMO, important to avoid confusion.and any other drive you connect to your motherboard will be a SLAVE drive.
Because the SATA interface supports only one SATA drive per cable, there is no Master or Slave. Only primary (or boot), secondary, tertiary, etc.
Otherwise, I agree with TechnoMage2016 and for a temporary task, you can just connect it as a secondary drive, as I indicated above. If your cables are long enough, you can have your drives sitting on the desktop, or just let them hang as long as the drive, and especially the drive's exposed controller board does not contact anything else. Or you can mount this drive into a spare drive bay and make it a permanent secondary drive for extra storage.