How come my SATA Samsung HM160HI hard drive shows up as UNKNOWN?

Q: I have connected a SATA Samsung HM160HI HDD to a USB device that External HDD’s use. The HDD shows up but it also shows up as an UNKOWN device and will not work. If i add a different 2.5 HDD it works. Yes the Samsung HDD is working and formated i’m just wondering what im doing wrong