CK_WD,
RPi is connected like above schema with original pidrive cable. You can not connect in different ways. To the point 5 is going 10cm usb cable + power adapter 5V/2A.
Also I tried, that point 4 was unplugged and I added there new 5V adapter, so both devices are powered separately.
Result is as i wrote before, pidrive is random beeping.
Martin