Of there is NOTHING on that old HDD that you want - are you SURE you don't want anything from it? - I suggest you use a utility like DBAN to Zero Fill that HDD. This will wipe out ALL old data on the unit and, as a side benefit, trigger a disk-wide self-checking and "repair" process so that it appears to have NO Bad Sectors on it. The process will take a few hours, so be patient. When it is finished, the unit is like a brand new HDD you just bought (well, almost) and you can use Windows Install to Partition and Format it as its normal first steps.
IF you do this, at the beginning of the process be VERY sure which HDD unit you are Zero Filling!! It DOES wipe out all data on that disk,m so you do not want to do that to the WRONG unit!