Hello Apprendi, first of all please let me know which is the operating system you are using?
It is important to have in mind that Intel guarantees the functionality of our products when using straight connections from the board to the backup device. We don’t recommend using adapters or converters.
We have tested a connection on the same NUC, from the thunderbolt port to an external thunderbolt hard drive and it was recognized without a problem.
If you any chance a driver is needed, it needs to be provided by the product manufacture, in this case SeaGate.
The following link will show you the list of tested peripherals. Intel� NUC — Tested peripherals
My OS is Windows 8.1 Pro with the latest uppdates and Intel's latest driver bundle for Intel Nuc and latest bios. I've got so far that I'm able to recognize 1 Seagate 3TB hard drive with Stae 129 Thunderbolt adapter and getting it to work at speeds about 120MB/s from my Intel msataSSd 525 180GB drive and output to my Dell monitor. But when I daisy chain other devices (Seagate 3TB hard drive with Stae 129 Thunderbolt adapters, I have 4pcs) they are not reconized at all?? The controllers I can see is Intels 7 chipset achi controller and standard achi controller.
Do I need to connect Everything to my NUC and then try to install windows 8.1 and all the drivers?
I'm very confused about this !!
Apprendi, have you checked the number of devices is the recognized power NUC chain?
At this point, the issue could be related to compatibility with the devices you are trying to connect or for lack of power when you connect more than 2 hard drives.