WinDlg not listing all drives

WD External Drives External Drives for PC
1

I’ve run WinDlg latest version. It  IS only listing my 6x2TB drives, but  NOT my 1.5TB drive, nor my 2x3TB drives. I’m using Win 8. Any clues?

2

Are all of the drives directly connected to the motherboard or via USB?

3

All drives are connected via USB.

4

I see. Then try connecting the drives that are not seen directly to the computer not an USB hub and see if they will appear.