Ah, so it's a power problem. How many HDDs are you attaching?
The solution is to use a powered hub. Something like this: https://www.amazon.co.uk/DIGIFLEX-Speed-Power-Adapter-Cable/dp/B003DVC7N6/ref=sr_1_6?s=computers&ie=UTF8&qid=1496913138&sr=1-6&keywords=powered+usb+hub
For your Kodi problem, try accessing the drive at it's location in the android file system.
External drives are located at /mnt/sda/sda1 (Q10 Pro internal HDD only) and /mnt/sdb/sdb1 then /mnt/sdb/sdb2 etc (all USB drives).
So in Kodi, go root filesystem then /mnt/sda
Zidoo X10 has a bigger 3A PSU so would be better able to power multiple external HDDs.