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The Pi 4B has 2x USB 3.0 ports. I have 2 choices to connect my hard drives:

  1. Using a single 10-port hub which connects to 1 USB 3.0 port.
  2. Using two 5-port hubs which connect to two USB 3.0 ports.

Which is better for my setup in term of bandwith? In other words, does the 2 USB 3.0 ports belong to an integrated hub and share the same root port, like the 4 USB 2.0 ports (2x USB2 + 2xUSB3 working in 2.0 mode) do?

By the way, the 10-port hub has a 12V 4A power adapter, while the 5-port hub has 5V 2A adapter (with a variation with 12V 2A available). Which one should I get? I have a total of 10 3.5" HDDs, which connected to Seagate HDD docks. That dock takes a 12V 1.5A input, but I am not sure if it provides 5V power to the HDD or relies on 5V from the USB connection.

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    3.5inch "spinning rust" HDD's need 12V - unless something has changed in the last few years
    – Bravo
    Jul 12 at 6:17
  • @Bravo I already know that, as stated in the question. What I do not know is whether they take 5V from the dock (adapter) or from USB connection.
    – Livy
    Jul 12 at 6:22
  • If you really want to know buy an USB adapter that measures the USB voltage and current. Typically one would expect that a self-powered HDD dock uses it's power adapter for both required voltages.
    – Robert
    Jul 12 at 17:46

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