. . . I have an old Hard drive that I want to use as a backup and connect it to the MB.
Yes,that the situation.This is confusing. In that case, what you want is a PATA to SATA adapter. You have an older PATA HDD and want to connect it to a SATA port in your mobo, right?
BTW, both STA and PATA are both IDE (they both use Integrated Drive Electronics.)